Initial WebAssembly support in clang

[sunfish]

Summary

This patch adds initial WebAssembly support in clang. The WebAssembly target is currently experimental.

[jfb]

include/clang/Basic/TargetCXXABI.h

166

@rengolin: FYI.

lib/Basic/Targets.cpp

6935

That's already the default?

6937

Already the default?

6938

TLSSupported = false for now.

6941

Not needed, since that's the default impl?

6956

I'm not sure we need this. Does it just make porting easier?

6983

final for these two.

6994

final

7015

final

lib/Driver/Tools.cpp

1559

New comment style without name -.

test/CodeGen/wasm-arguments.c

92

TODO for vararg test?

test/Driver/wasm32-unknown-unknown.cpp

52

Also test __wasm32__ (and 64 in the other file).

65

Test __REGISTER_PREFIX__ if we do keep it.

test/Preprocessor/init.c

8478

ATOMIC_*_LOCK_FREE should always be 1 for "maybe".

[sunfish]

lib/Basic/Targets.cpp

6935

I thought I'd leave it in while we discuss whether this is really what we want.

6937

Right.

6938

Since the MVP doesn't have threads at all, all variables are TLS :-). And after the MVP, we'll add threads with TLS. Is there a downside to leaving this on for now? It'll make the thread prototyping work easier.

6941

We're going to put code in there before long anyway, so there's no harm in getting it ready.

6956

I don't know if we specifically need it; I just included it because lots of other popular targets have it.

6983

Right.

6994

This class is subclassed.

7015

This one is too.

lib/Driver/Tools.cpp

1559

Right.

test/CodeGen/wasm-arguments.c

92

There's a TODO for "implement va_list properly" elsewhere, so we can add tests when we actually implement it.

test/Driver/wasm32-unknown-unknown.cpp

52

test/Preprocessor/init.c covers this.

65

test/Preprocessor/init.c covers this.

test/Preprocessor/init.c

8478

Clang is setting these automatically based on the value of MaxAtomicInlineWidth. Are you saying 32 is the wrong value for wasm32? This is perhaps a discussion to be had on the spec side.

The value for wasm64 is also an interesting topic for the spec side.

[sunfish]

Minor changes to address review comments.

[sunfish]

• use more default values in WebAssemblyTargetInfo etc.
• add a comment about using ARM-C++-ABI-style guard variables (for now)
• fix diff to include context for Phabricator

[sunfish]

lib/Basic/Targets.cpp

6953

I've now removed this (for now; we can discuss what to do in a later patch).

[jfb]

lib/Basic/Targets.cpp

6956

True, leaving it as is sgtm.

7012

Weird, the comment moved around. I put it on WebAssembly32TargetInfo which doesn't seem subclassed? Same for 64. Or is that going to be on the LLVM side? final on getTargetDefines instead?

test/Preprocessor/init.c

8478

Yes, we don't know yet whether we guarantee atomicity so returning "maybe" is the conservative thing (which we can change in the future). We can discuss what we guarantee on the spec side, but for now the conservative thing is better IMO (and changing it isn't a problem, whereas changing "always" is a problem).

FWIW N4509 is relevant.

[sunfish]

• set MaxAtomicInlineWidth to 0 for now (sets *_ATOMIC_*_LOCK_FREE to 1)
• enable LargeArrayAlign
• enable __int128
• various cleanups

[sunfish]

lib/Basic/Targets.cpp

7012

WebAssembly32TargetInfo is subclassed in LLVM code, and getTargetDefines is overridden.

test/Preprocessor/init.c

8478

Ok, I've set MaxAtomicInlineWidth to 0 for now so that we don't block the rest of the patch on this issue.

N4509 is just about exposing the same information via a different interface.

[jfb]

lgtm

lib/Basic/Targets.cpp

7004

Does int 128 get expanded in legalization? Seems good.

test/Preprocessor/init.c

8478

constexpr makes a world of difference I'm told :-)

[sunfish]

The patch evolved enough to prompt posting one more new version; major changes:

• make constructors and destructors return this
• enable -fuse-init-array
• enable -fno-common
• disable -mdisable-fp-elim
• put static init code in ".text.__startup"
• define a "+simd128" feature, -msimd128 option, wasm_simd128 macro
• ignore empty struct arguments and return values
• more tests

[jfb]

Still lgtm, with minor comments.

lib/CodeGen/ItaniumCXXABI.cpp

364

It's more common to have no spaces for these comments: /*UseARMMethodPtrABI=*/true,.

lib/Driver/Tools.cpp

1567

Could you expand a bit on why "native" doesn't make sense if LLVM itself wasn't compiled for wasm?

[sunfish]

lib/CodeGen/ItaniumCXXABI.cpp

364

Ok. I updated this in my local patch.

lib/Driver/Tools.cpp

1567

Ok. I added a comment to my local patch that says: "native" isn't meaningful when cross compiling, so only support this when the host is also WebAssembly.

[sunfish]

Minor updates to keep the patch building and working as code changes around it. Also enabled -mthread-model.

[echristo]

Some inline comments.

Thanks!

-eric

include/clang/Basic/TargetCXXABI.h

166

Can you elaborate on the comment here as to what the alignment here means or something? It looks incomplete otherwise.

lib/Basic/Targets.cpp

6992–6998

Might make sense to copy the x86 bits here?

7699–7724

Seems overly complicated? Maybe just a positive test?

lib/CodeGen/CodeGenModule.cpp

809

Update the comment?

lib/Driver/ToolChains.cpp

3835–3855

No generic defaults here? Might also make sense to have these all inline if they're just return true/return false.

lib/Driver/Tools.cpp

1567–1572

I really dislike the idea of an ifdef here for this behavior. Can you explain some more? :)

[sunfish]

Thanks for the review!

include/clang/Basic/TargetCXXABI.h

166

Ok, I'll add a longer comment.

lib/Basic/Targets.cpp

6992–6998

The x86 bits don't handle "-" attributes, so it's not directly applicable.

7699–7724

Good idea. I'll do that.

lib/CodeGen/CodeGenModule.cpp

809

Ok, I'll write a bit more here.

lib/Driver/ToolChains.cpp

3835–3855

All these functions are returning non-default values or are overriding pure virtual functions.

And they're outline because they're virtual overrides, so there's little optimization advantage to defining them in the header. And it's what most of the other toolchain definitions do most of the time.

lib/Driver/Tools.cpp

1567–1572

As we discussed on IRC, I'll remove this code for now.

[sunfish]

Updated to address review comments:

• added comments
• simplified Triple validation code
• removed -mcpu="native" code

[echristo]

A couple things inline that need changing, but feel free to commit after without a repost.

-eric

lib/Basic/Targets.cpp

7000–7001

The backend should handle any weirdness here with missing features especially as this will report an error based on -cc1 compilation and not the main command line.

I.e. it's not necessary, that said if you feel wedded to it there's no problem either.

7701–7705

Why not just a positive test?

7709–7715

Ditto.

(I said this just below, but it seems to have gotten munged in the newer version)

[• sunfishcode]

lib/Basic/Targets.cpp

7000–7001

I do feel more comfortable rejecting anything that I'm not specifically expecting in this area.

7709–7715

I actually did see your comment and updated the code accordingly. It now does a positive test, Triple == llvm::Triple("wasm64-unknown-unknown"), which is simpler than what it did before.

However, it's also doing additional tests, because the Triple class's operator== doesn't distinguish between an Unknown that was actually "unknown" or an unknown that was some other string. Until we figure out what "vendor", "OS", and "environment" variations of wasm make sense (if any), we want to avoid dealing with accidental alternate triples.

[echristo]

lib/Basic/Targets.cpp

7709–7715

I think this is a lot of overkill here, no other target cares about this so why should the wasm target? If it's that important maybe fix Triple?

[• sunfishcode]

lib/Basic/Targets.cpp

7709–7715

This Triple issue is not important enough to hold up the rest of the patch for, so I just removed it. Thanks for the review!

include/clang/Basic/BuiltinsWebAssembly.def

+// BuiltinsWebAssembly.def - WebAssembly builtin function database -*- C++ -*-//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file defines the WebAssembly-specific builtin function database.
+/// Users of this file must define the BUILTIN macro to make use of this
+/// information.
+///
+//===----------------------------------------------------------------------===//
+
+// The format of this database matches clang/Basic/Builtins.def.
+
+BUILTIN(__builtin_wasm_page_size, "z", "")
+
+#undef BUILTIN

include/clang/Basic/TargetBuiltins.h

#include "clang/Basic/BuiltinsXCore.def"
   namespace SystemZ {
     enum {
         LastTIBuiltin = clang::Builtin::FirstTSBuiltin-1,
 #define BUILTIN(ID, TYPE, ATTRS) BI##ID,
 #include "clang/Basic/BuiltinsSystemZ.def"
         LastTSBuiltin
     };
   }
+
+  /// \brief WebAssembly builtins
+  namespace WebAssembly {
+    enum {
+      LastTIBuiltin = clang::Builtin::FirstTSBuiltin-1,
+#define BUILTIN(ID, TYPE, ATTRS) BI##ID,
+#include "clang/Basic/BuiltinsWebAssembly.def"
+      LastTSBuiltin
+    };
+  }
+
 } // end namespace clang.
 
 #endif

include/clang/Basic/TargetCXXABI.h

enum Kind {
     GenericAArch64,
 
     /// The generic Mips ABI is a modified version of the Itanium ABI.
     ///
     /// At the moment, only change from the generic ABI in this case is:
     ///   - representation of member function pointers adjusted as in ARM.
     GenericMIPS,
 
+    /// The WebAssembly ABI is a modified version of the Itanium ABI.
+    ///
+    /// The changes from the Itanium ABI are:
+    ///   - representation of member function pointers is adjusted, as in ARM;
+    ///   - member functions are not specially aligned;
+    ///   - constructors and destructors return 'this', as in ARM;
+    ///   - guard variables are 32-bit on wasm32, as in ARM;
+    ///   - unused bits of guard variables are reserved, as in ARM;
+    ///   - inline functions are never key functions, as in ARM;
+    ///   - C++11 POD rules are used for tail padding, as in iOS64.
+    ///
+    /// TODO: At present the WebAssembly ABI is not considered stable, so none
+    /// of these details is necessarily final yet.
+    WebAssembly,
+
     /// The Microsoft ABI is the ABI used by Microsoft Visual Studio (and
     /// compatible compilers).
     ///
     /// FIXME: should this be split into Win32 and Win64 variants?
     ///
     /// Only scattered and incomplete official documentation exists.
     Microsoft
   };
public:
   bool isItaniumFamily() const {
     switch (getKind()) {
     case GenericAArch64:
     case GenericItanium:
     case GenericARM:
     case iOS:
     case iOS64:
     case GenericMIPS:
+    case WebAssembly:
       return true;
 
     case Microsoft:
       return false;
     }
     llvm_unreachable("bad ABI kind");
   }
 
   /// \brief Is this ABI an MSVC-compatible ABI?
   bool isMicrosoft() const {
     switch (getKind()) {
     case GenericAArch64:
     case GenericItanium:
     case GenericARM:
     case iOS:
     case iOS64:
     case GenericMIPS:
+    case WebAssembly:
       return false;
 
     case Microsoft:
       return true;
     }
     llvm_unreachable("bad ABI kind");
   }
 
+  /// \brief Are member functions differently aligned?
+  bool areMemberFunctionsAligned() const {
+    switch (getKind()) {
+    case WebAssembly:
+      // WebAssembly doesn't require any special alignment for member functions.
+      return false;
+    case GenericARM:
+    case GenericAArch64:
+    case GenericMIPS:
+      // TODO: ARM-style pointers to member functions put the discriminator in
+      //       the this adjustment, so they don't require functions to have any
+      //       special alignment and could therefore also return false.
+    case GenericItanium:
+    case iOS:
+    case iOS64:
+    case Microsoft:
+      return true;
+    }
+    llvm_unreachable("bad ABI kind");
+  }
+
   /// \brief Is the default C++ member function calling convention
   /// the same as the default calling convention?
   bool isMemberFunctionCCDefault() const {
     // Right now, this is always false for Microsoft.
     return !isMicrosoft();
   }
 
   /// Are arguments to a call destroyed left to right in the callee?
public:
   /// it can cause type data to be emitted with both weak and strong
   /// linkage, which is not allowed on all platforms.  Therefore,
   /// exploiting this observation requires an ABI break and cannot be
   /// done on a generic Itanium platform.
   bool canKeyFunctionBeInline() const {
     switch (getKind()) {
     case GenericARM:
     case iOS64:
+    case WebAssembly:
       return false;
 
     case GenericAArch64:
     case GenericItanium:
     case iOS:   // old iOS compilers did not follow this rule
     case Microsoft:
     case GenericMIPS:
       return true;
enum TailPaddingUseRules {
     /// Only allocate objects in the tail padding of a base class if
     /// the base class is not POD according to the rules of C++11.
     UseTailPaddingUnlessPOD11
   };
   TailPaddingUseRules getTailPaddingUseRules() const {
     switch (getKind()) {
     // To preserve binary compatibility, the generic Itanium ABI has
     // permanently locked the definition of POD to the rules of C++ TR1,
-    // and that trickles down to all the derived ABIs.
+    // and that trickles down to derived ABIs.
     case GenericItanium:
     case GenericAArch64:
     case GenericARM:
     case iOS:
     case GenericMIPS:
       return UseTailPaddingUnlessPOD03;
 
-    // iOS on ARM64 uses the C++11 POD rules.  It does not honor the
-    // Itanium exception about classes with over-large bitfields.
+    // iOS on ARM64 and WebAssembly use the C++11 POD rules.  They do not honor
+    // the Itanium exception about classes with over-large bitfields.
     case iOS64:
+    case WebAssembly:
       return UseTailPaddingUnlessPOD11;
 
     // MSVC always allocates fields in the tail-padding of a base class
     // subobject, even if they're POD.
     case Microsoft:
       return AlwaysUseTailPadding;
     }
     llvm_unreachable("bad ABI kind");

include/clang/Driver/Options.td

 def i_Group               : OptionGroup<"<i group>">, Group<CompileOnly_Group>;
 def clang_i_Group         : OptionGroup<"<clang i group>">, Group<i_Group>;
 def m_Group               : OptionGroup<"<m group>">, Group<CompileOnly_Group>;
 def m_x86_Features_Group  : OptionGroup<"<m x86 features group>">, Group<m_Group>, Flags<[CoreOption]>;
 def m_hexagon_Features_Group  : OptionGroup<"<m hexagon features group>">, Group<m_Group>;
 def m_arm_Features_Group  : OptionGroup<"<m arm features group>">, Group<m_Group>;
 def m_aarch64_Features_Group  : OptionGroup<"<m aarch64 features group>">, Group<m_Group>;
 def m_ppc_Features_Group  : OptionGroup<"<m ppc features group>">, Group<m_Group>;
+def m_wasm_Features_Group : OptionGroup<"<m wasm features group>">,
+                                        Group<m_Group>;
 def m_libc_Group          : OptionGroup<"<m libc group>">, Group<m_Group>;
 def u_Group               : OptionGroup<"<u group>">;
 
 def pedantic_Group        : OptionGroup<"<pedantic group>">,
   Group<CompileOnly_Group>;
 def reserved_lib_Group   : OptionGroup<"<reserved libs group>">;
 
 // Temporary groups for clang options which we know we don't support,
def mfix_cortex_a53_835769 : Flag<["-"], "mfix-cortex-a53-835769">,
   Group<m_aarch64_Features_Group>,
   HelpText<"Workaround Cortex-A53 erratum 835769 (AArch64 only)">;
 def mno_fix_cortex_a53_835769 : Flag<["-"], "mno-fix-cortex-a53-835769">,
   Group<m_aarch64_Features_Group>,
   HelpText<"Don't workaround Cortex-A53 erratum 835769 (AArch64 only)">;
 def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
   HelpText<"Reserve the x18 register (AArch64 only)">;
 
+def msimd128 : Flag<["-"], "msimd128">, Group<m_wasm_Features_Group>;
+def mno_simd128 : Flag<["-"], "mno-simd128">, Group<m_wasm_Features_Group>;
+
 def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
 def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
 def mpower8_vector : Flag<["-"], "mpower8-vector">,
     Group<m_ppc_Features_Group>;
 def mno_power8_vector : Flag<["-"], "mno-power8-vector">,
     Group<m_ppc_Features_Group>;
 def mpower8_crypto : Flag<["-"], "mcrypto">,
     Group<m_ppc_Features_Group>;

include/clang/module.modulemap

module Clang_Basic {
   textual header "Basic/BuiltinsHexagon.def"
   textual header "Basic/BuiltinsLe64.def"
   textual header "Basic/BuiltinsMips.def"
   textual header "Basic/BuiltinsNEON.def"
   textual header "Basic/BuiltinsNVPTX.def"
   textual header "Basic/BuiltinsPPC.def"
   textual header "Basic/BuiltinsR600.def"
   textual header "Basic/BuiltinsSystemZ.def"
+  textual header "Basic/BuiltinsWebAssembly.def"
   textual header "Basic/BuiltinsX86.def"
   textual header "Basic/BuiltinsXCore.def"
   textual header "Basic/DiagnosticOptions.def"
   textual header "Basic/LangOptions.def"
   textual header "Basic/OpenCLExtensions.def"
   textual header "Basic/OpenMPKinds.def"
   textual header "Basic/OperatorKinds.def"
   textual header "Basic/Sanitizers.def"

lib/AST/ASTContext.cpp

CXXABI *ASTContext::createCXXABI(const TargetInfo &T) {
 
   switch (T.getCXXABI().getKind()) {
   case TargetCXXABI::GenericARM: // Same as Itanium at this level
   case TargetCXXABI::iOS:
   case TargetCXXABI::iOS64:
   case TargetCXXABI::GenericAArch64:
   case TargetCXXABI::GenericMIPS:
   case TargetCXXABI::GenericItanium:
+  case TargetCXXABI::WebAssembly:
     return CreateItaniumCXXABI(*this);
   case TargetCXXABI::Microsoft:
     return CreateMicrosoftCXXABI(*this);
   }
   llvm_unreachable("Invalid CXXABI type!");
 }
 
 static const LangAS::Map *getAddressSpaceMap(const TargetInfo &T,

 MangleContext *ASTContext::createMangleContext() {
   switch (Target->getCXXABI().getKind()) {
   case TargetCXXABI::GenericAArch64:
   case TargetCXXABI::GenericItanium:
   case TargetCXXABI::GenericARM:
   case TargetCXXABI::GenericMIPS:
   case TargetCXXABI::iOS:
   case TargetCXXABI::iOS64:
+  case TargetCXXABI::WebAssembly:
     return ItaniumMangleContext::create(*this, getDiagnostics());
   case TargetCXXABI::Microsoft:
     return MicrosoftMangleContext::create(*this, getDiagnostics());
   }
   llvm_unreachable("Unsupported ABI");
 }
 
 CXXABI::~CXXABI() {}

lib/Basic/Targets.cpp

if (Triple.getArch() == llvm::Triple::arm) {
       // Handled on mips' setDataLayoutString.
     } else {
       assert(Triple.getArch() == llvm::Triple::le32);
       this->DataLayoutString = "e-p:32:32-i64:64";
     }
   }
 };
 
+namespace {
+// WebAssembly target
+template <typename Target>
+class WebAssemblyOSTargetInfo : public OSTargetInfo<Target> {
+  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
+                    MacroBuilder &Builder) const override final {
+    // A common platform macro.
+    if (Opts.POSIXThreads)
+      Builder.defineMacro("_REENTRANT");
+    // Follow g++ convention and predefine _GNU_SOURCE for C++.
+    if (Opts.CPlusPlus)
+      Builder.defineMacro("_GNU_SOURCE");
+  }
+
+  // As an optimization, group static init code together in a section.
+  const char *getStaticInitSectionSpecifier() const override final {
+    return ".text.__startup";
+  }
+
+public:
+  explicit WebAssemblyOSTargetInfo(const llvm::Triple &Triple)
+      : OSTargetInfo<Target>(Triple) {
+    this->MCountName = "__mcount";
+    this->UserLabelPrefix = "";
+    this->TheCXXABI.set(TargetCXXABI::WebAssembly);
+  }
+};
+} // end anonymous namespace
+
 //===----------------------------------------------------------------------===//
 // Specific target implementations.
 //===----------------------------------------------------------------------===//
 
 // PPC abstract base class
 class PPCTargetInfo : public TargetInfo {
   static const Builtin::Info BuiltinInfo[];
   static const char * const GCCRegNames[];
BuiltinVaListKind getBuiltinVaListKind() const override {
     return TargetInfo::PNaClABIBuiltinVaList;
   }
   const char *getClobbers() const override { return ""; }
   void getGCCRegNames(const char *const *&Names,
                       unsigned &NumNames) const override {
     Names = nullptr;
     NumNames = 0;
   }
   void getGCCRegAliases(const GCCRegAlias *&Aliases,
                         unsigned &NumAliases) const override {
     Aliases = nullptr;
     NumAliases = 0;
   }
   bool validateAsmConstraint(const char *&Name,
                              TargetInfo::ConstraintInfo &Info) const override {
     return false;
   }
 
   bool hasProtectedVisibility() const override { return false; }
 };
+
+class WebAssemblyTargetInfo : public TargetInfo {
+  static const Builtin::Info BuiltinInfo[];
+
+  enum CPUEnum {
+    CE_Generic,
+    CE_MVP,
+    CE_BleedingEdge,
+  } CPU;
+
+  enum SIMDEnum {
+    NoSIMD,
+    SIMD128,
+  } SIMDLevel;
+
+public:
+  explicit WebAssemblyTargetInfo(const llvm::Triple &T)
+      : TargetInfo(T), CPU(CE_Generic), SIMDLevel(NoSIMD) {
+    BigEndian = false;
+    NoAsmVariants = true;
+    SuitableAlign = 128;
+    LargeArrayMinWidth = 128;
+    LargeArrayAlign = 128;
+    SimdDefaultAlign = 128;
+  }
+
+protected:
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override {
+    defineCPUMacros(Builder, "wasm", /*Tuning=*/false);
+    if (SIMDLevel >= SIMD128)
+      Builder.defineMacro("__wasm_simd128__");
+  }
+
+private:
+  void
+  getDefaultFeatures(llvm::StringMap<bool> &Features) const override final {
+    switch (CPU) {
+    case CE_BleedingEdge:
+      Features["simd128"] = true;
+      break;
+    default:
+      break;
+    }
+  }
+  bool hasFeature(StringRef Feature) const override final {
+    return llvm::StringSwitch<bool>(Feature)
+        .Case("simd128", SIMDLevel >= SIMD128)
+        .Default(false);
+  }
+  bool handleTargetFeatures(std::vector<std::string> &Features,
+                            DiagnosticsEngine &Diags) override final {
+    for (const auto &Feature : Features) {
+      if (Feature == "+simd128") {
+        SIMDLevel = std::max(SIMDLevel, SIMD128);
+        continue;
+      }
+      if (Feature == "-simd128") {
+        SIMDLevel = std::min(SIMDLevel, SIMDEnum(SIMD128 - 1));
+        continue;
+      }
+
+      Diags.Report(diag::err_opt_not_valid_with_opt) << Feature
+                                                     << "-target-feature";
+      return false;
+    }
+    return true;
+  }
+  bool setCPU(const std::string &Name) override final {
+    CPU = llvm::StringSwitch<CPUEnum>(Name)
+              .Case("mvp",           CE_MVP)
+              .Case("bleeding-edge", CE_BleedingEdge)
+              .Default(CE_Generic);
+    return CPU != CE_Generic || Name == "generic";
+  }
+  void getTargetBuiltins(const Builtin::Info *&Records,
+                         unsigned &NumRecords) const override final {
+    Records = BuiltinInfo;
+    NumRecords = clang::WebAssembly::LastTSBuiltin - Builtin::FirstTSBuiltin;
+  }
+  BuiltinVaListKind getBuiltinVaListKind() const override final {
+    // TODO: Implement va_list properly.
+    return VoidPtrBuiltinVaList;
+  }
+  void getGCCRegNames(const char *const *&Names,
+                      unsigned &NumNames) const override final {
+    Names = nullptr;
+    NumNames = 0;
+  }
+  void getGCCRegAliases(const GCCRegAlias *&Aliases,
+                        unsigned &NumAliases) const override final {
+    Aliases = nullptr;
+    NumAliases = 0;
+  }
+  bool
+  validateAsmConstraint(const char *&Name,
+                        TargetInfo::ConstraintInfo &Info) const override final {
+    return false;
+  }
+  const char *getClobbers() const override final { return ""; }
+  bool isCLZForZeroUndef() const override final { return false; }
+  bool hasInt128Type() const override final { return true; }
+};
+
+const Builtin::Info WebAssemblyTargetInfo::BuiltinInfo[] = {
+#define BUILTIN(ID, TYPE, ATTRS) \
+  { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
+#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER) \
+  { #ID, TYPE, ATTRS, HEADER, ALL_LANGUAGES, nullptr },
+#include "clang/Basic/BuiltinsWebAssembly.def"
+};
+
+class WebAssembly32TargetInfo : public WebAssemblyTargetInfo {
+public:
+  explicit WebAssembly32TargetInfo(const llvm::Triple &T)
+      : WebAssemblyTargetInfo(T) {
+    // TODO: Set this to the correct value once the spec issues are resolved.
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 0;
+    DataLayoutString = "e-p:32:32-i64:64-v128:8:128-n32:64-S128";
+  }
+
+protected:
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override {
+    WebAssemblyTargetInfo::getTargetDefines(Opts, Builder);
+    defineCPUMacros(Builder, "wasm32", /*Tuning=*/false);
+  }
+};
+
+class WebAssembly64TargetInfo : public WebAssemblyTargetInfo {
+public:
+  explicit WebAssembly64TargetInfo(const llvm::Triple &T)
+      : WebAssemblyTargetInfo(T) {
+    LongAlign = LongWidth = 64;
+    PointerAlign = PointerWidth = 64;
+    // TODO: Set this to the correct value once the spec issues are resolved.
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 0;
+    DataLayoutString = "e-p:64:64-i64:64-v128:8:128-n32:64-S128";
+  }
+
+protected:
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override {
+    WebAssemblyTargetInfo::getTargetDefines(Opts, Builder);
+    defineCPUMacros(Builder, "wasm64", /*Tuning=*/false);
+  }
+};
+
 } // end anonymous namespace.
 
 const Builtin::Info Le64TargetInfo::BuiltinInfo[] = {
 #define BUILTIN(ID, TYPE, ATTRS)                                               \
   { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
 #include "clang/Basic/BuiltinsLe64.def"
 };
 
case llvm::Triple::spir: {
     return new SPIR32TargetInfo(Triple);
   }
   case llvm::Triple::spir64: {
     if (Triple.getOS() != llvm::Triple::UnknownOS ||
         Triple.getEnvironment() != llvm::Triple::UnknownEnvironment)
       return nullptr;
     return new SPIR64TargetInfo(Triple);
   }
+  case llvm::Triple::wasm32: {
+    // Until specific variations are defined, don't permit any.
+    if (Triple.getSubArch() != llvm::Triple::NoSubArch ||
+        Triple.getVendor() != llvm::Triple::UnknownVendor ||
+        Triple.getOS() != llvm::Triple::UnknownOS ||
+        Triple.getEnvironment() != llvm::Triple::UnknownEnvironment ||
+        Triple.getObjectFormat() != llvm::Triple::UnknownObjectFormat ||
+        (!Triple.getVendorName().empty() &&
+         Triple.getVendorName() != "unknown") ||
+        (!Triple.getOSName().empty() && Triple.getOSName() != "unknown") ||
+        (Triple.hasEnvironment() && Triple.getEnvironmentName() != "unknown"))
+      return nullptr;
+    return new WebAssemblyOSTargetInfo<WebAssembly32TargetInfo>(Triple);
+  }
+  case llvm::Triple::wasm64: {
+    // Until specific variations are defined, don't permit any.
+    if (Triple.getSubArch() != llvm::Triple::NoSubArch ||
+        Triple.getVendor() != llvm::Triple::UnknownVendor ||
+        Triple.getOS() != llvm::Triple::UnknownOS ||
+        Triple.getEnvironment() != llvm::Triple::UnknownEnvironment ||
+        Triple.getObjectFormat() != llvm::Triple::UnknownObjectFormat ||
+        (!Triple.getVendorName().empty() &&
+         Triple.getVendorName() != "unknown") ||
+        (!Triple.getOSName().empty() && Triple.getOSName() != "unknown") ||
+        (Triple.hasEnvironment() && Triple.getEnvironmentName() != "unknown"))
+      return nullptr;
+    return new WebAssemblyOSTargetInfo<WebAssembly64TargetInfo>(Triple);
+  }
   }
 }
 
 /// CreateTargetInfo - Return the target info object for the specified target
 /// options.
 TargetInfo *
 TargetInfo::CreateTargetInfo(DiagnosticsEngine &Diags,
                              const std::shared_ptr<TargetOptions> &Opts) {

lib/CodeGen/CGBuiltin.cpp

Value *CodeGenFunction::EmitTargetBuiltinExpr(unsigned BuiltinID,
   case llvm::Triple::r600:
   case llvm::Triple::amdgcn:
     return EmitAMDGPUBuiltinExpr(BuiltinID, E);
   case llvm::Triple::systemz:
     return EmitSystemZBuiltinExpr(BuiltinID, E);
   case llvm::Triple::nvptx:
   case llvm::Triple::nvptx64:
     return EmitNVPTXBuiltinExpr(BuiltinID, E);
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+    return EmitWebAssemblyBuiltinExpr(BuiltinID, E);
   default:
     return nullptr;
   }
 }
 
 static llvm::VectorType *GetNeonType(CodeGenFunction *CGF,
                                      NeonTypeFlags TypeFlags,
                                      bool V1Ty=false) {
Value *FnALAF32 =
         CGM.getIntrinsic(Intrinsic::nvvm_atomic_load_add_f32, Ptr->getType());
     return Builder.CreateCall(FnALAF32, {Ptr, Val});
   }
 
   default:
     return nullptr;
   }
 }
+
+Value *CodeGenFunction::EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
+                                                   const CallExpr *E) {
+  switch (BuiltinID) {
+  case WebAssembly::BI__builtin_wasm_page_size: {
+    llvm::Type *ResultType = ConvertType(E->getType());
+    Value *Callee = CGM.getIntrinsic(Intrinsic::wasm_page_size, ResultType);
+    return Builder.CreateCall(Callee);
+  }
+
+  default:
+    return nullptr;
+  }
+}

lib/CodeGen/CodeGenFunction.h

public:
   llvm::Value *EmitAArch64BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
 
   llvm::Value *BuildVector(ArrayRef<llvm::Value*> Ops);
   llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitAMDGPUBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitSystemZBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitNVPTXBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
+  llvm::Value *EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
+                                          const CallExpr *E);
 
   llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
   llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
   llvm::Value *EmitObjCBoxedExpr(const ObjCBoxedExpr *E);
   llvm::Value *EmitObjCArrayLiteral(const ObjCArrayLiteral *E);
   llvm::Value *EmitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E);
   llvm::Value *EmitObjCCollectionLiteral(const Expr *E,
                                 const ObjCMethodDecl *MethodWithObjects);

lib/CodeGen/CodeGenModule.cpp

 static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
   switch (CGM.getTarget().getCXXABI().getKind()) {
   case TargetCXXABI::GenericAArch64:
   case TargetCXXABI::GenericARM:
   case TargetCXXABI::iOS:
   case TargetCXXABI::iOS64:
   case TargetCXXABI::GenericMIPS:
   case TargetCXXABI::GenericItanium:
+  case TargetCXXABI::WebAssembly:
     return CreateItaniumCXXABI(CGM);
   case TargetCXXABI::Microsoft:
     return CreateMicrosoftCXXABI(CGM);
   }
 
   llvm_unreachable("invalid C++ ABI kind");
 }
 
void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
   else if (const auto *MD = dyn_cast<CXXMethodDecl>(D))
     if (MD->isVirtual())
       F->setUnnamedAddr(true);
 
   unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
   if (alignment)
     F->setAlignment(alignment);
 
+  if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
     // C++ ABI requires 2-byte alignment for member functions.
     if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
       F->setAlignment(2);
   }
+}
 
 void CodeGenModule::SetCommonAttributes(const Decl *D,
                                         llvm::GlobalValue *GV) {
   if (const auto *ND = dyn_cast<NamedDecl>(D))
     setGlobalVisibility(GV, ND);
   else
     GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
 

lib/CodeGen/ItaniumCXXABI.cpp

 
 class iOS64CXXABI : public ARMCXXABI {
 public:
   iOS64CXXABI(CodeGen::CodeGenModule &CGM) : ARMCXXABI(CGM) {}
 
   // ARM64 libraries are prepared for non-unique RTTI.
   bool shouldRTTIBeUnique() const override { return false; }
 };
+
+class WebAssemblyCXXABI final : public ItaniumCXXABI {
+public:
+  explicit WebAssemblyCXXABI(CodeGen::CodeGenModule &CGM) :
+    ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
+                  /* UseARMGuardVarABI = */ true) {}
+
+private:
+  bool HasThisReturn(GlobalDecl GD) const override {
+    return isa<CXXConstructorDecl>(GD.getDecl()) ||
+           (isa<CXXDestructorDecl>(GD.getDecl()) &&
+            GD.getDtorType() != Dtor_Deleting);
+  }
+};
 }
 
 CodeGen::CGCXXABI *CodeGen::CreateItaniumCXXABI(CodeGenModule &CGM) {
   switch (CGM.getTarget().getCXXABI().getKind()) {
   // For IR-generation purposes, there's no significant difference
   // between the ARM and iOS ABIs.
   case TargetCXXABI::GenericARM:
   case TargetCXXABI::iOS:
     return new ARMCXXABI(CGM);
 
   case TargetCXXABI::iOS64:
     return new iOS64CXXABI(CGM);
 
   // Note that AArch64 uses the generic ItaniumCXXABI class since it doesn't
   // include the other 32-bit ARM oddities: constructor/destructor return values
   // and array cookies.
   case TargetCXXABI::GenericAArch64:
     return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
                              /* UseARMGuardVarABI = */ true);
 
   case TargetCXXABI::GenericMIPS:
     return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true);
 
+  case TargetCXXABI::WebAssembly:
+    return new WebAssemblyCXXABI(CGM);
+
   case TargetCXXABI::GenericItanium:
     if (CGM.getContext().getTargetInfo().getTriple().getArch()
         == llvm::Triple::le32) {
       // For PNaCl, use ARM-style method pointers so that PNaCl code
       // does not assume anything about the alignment of function
       // pointers.
       return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
                                /* UseARMGuardVarABI = */ false);

lib/CodeGen/TargetInfo.cpp

ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy) const {
   if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
     RetTy = EnumTy->getDecl()->getIntegerType();
 
   return (RetTy->isPromotableIntegerType() ?
           ABIArgInfo::getExtend() : ABIArgInfo::getDirect());
 }
 
 //===----------------------------------------------------------------------===//
+// WebAssembly ABI Implementation
+//
+// This is a very simple ABI that relies a lot on DefaultABIInfo.
+//===----------------------------------------------------------------------===//
+
+class WebAssemblyABIInfo final : public DefaultABIInfo {
+public:
+  explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT)
+      : DefaultABIInfo(CGT) {}
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
+
+  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
+  // non-virtual, but computeInfo is virtual, so we overload that.
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &Arg : FI.arguments())
+      Arg.info = classifyArgumentType(Arg.type);
+  }
+};
+
+class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo {
+public:
+  explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
+      : TargetCodeGenInfo(new WebAssemblyABIInfo(CGT)) {}
+};
+
+/// \brief Classify argument of given type \p Ty.
+ABIArgInfo WebAssemblyABIInfo::classifyArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // passed by value.
+    unsigned TypeAlign = getContext().getTypeAlignInChars(Ty).getQuantity();
+    if (auto RAA = getRecordArgABI(Ty, getCXXABI()))
+      return ABIArgInfo::getIndirect(TypeAlign,
+                                     RAA == CGCXXABI::RAA_DirectInMemory);
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+    // Lower single-element structs to just pass a regular value. TODO: We
+    // could do reasonable-size multiple-element structs too, using getExpand(),
+    // though watch out for things like bitfields.
+    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
+      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+    return ABIArgInfo::getIndirect(TypeAlign);
+  }
+
+  // Otherwise just do the default thing.
+  return DefaultABIInfo::classifyArgumentType(Ty);
+}
+
+ABIArgInfo WebAssemblyABIInfo::classifyReturnType(QualType RetTy) const {
+  if (isAggregateTypeForABI(RetTy)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // returned by value.
+    if (!getRecordArgABI(RetTy, getCXXABI())) {
+      // Ignore empty structs/unions.
+      if (isEmptyRecord(getContext(), RetTy, true))
+        return ABIArgInfo::getIgnore();
+      // Lower single-element structs to just return a regular value. TODO: We
+      // could do reasonable-size multiple-element structs too, using
+      // ABIArgInfo::getDirect().
+      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
+        return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+    }
+  }
+
+  // Otherwise just do the default thing.
+  return DefaultABIInfo::classifyReturnType(RetTy);
+}
+
+//===----------------------------------------------------------------------===//
 // le32/PNaCl bitcode ABI Implementation
 //
 // This is a simplified version of the x86_32 ABI.  Arguments and return values
 // are always passed on the stack.
 //===----------------------------------------------------------------------===//
 
 class PNaClABIInfo : public ABIInfo {
  public:
const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
   case llvm::Triple::aarch64_be: {
     AArch64ABIInfo::ABIKind Kind = AArch64ABIInfo::AAPCS;
     if (getTarget().getABI() == "darwinpcs")
       Kind = AArch64ABIInfo::DarwinPCS;
 
     return *(TheTargetCodeGenInfo = new AArch64TargetCodeGenInfo(Types, Kind));
   }
 
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+    return *(TheTargetCodeGenInfo = new WebAssemblyTargetCodeGenInfo(Types));
+
   case llvm::Triple::arm:
   case llvm::Triple::armeb:
   case llvm::Triple::thumb:
   case llvm::Triple::thumbeb:
     {
       if (Triple.getOS() == llvm::Triple::Win32) {
         TheTargetCodeGenInfo =
             new WindowsARMTargetCodeGenInfo(Types, ARMABIInfo::AAPCS_VFP);

lib/Driver/Driver.cpp

default:
         TC = new toolchains::HexagonToolChain(*this, Target, Args);
         break;
       case llvm::Triple::xcore:
         TC = new toolchains::XCoreToolChain(*this, Target, Args);
         break;
       case llvm::Triple::shave:
         TC = new toolchains::SHAVEToolChain(*this, Target, Args);
         break;
+      case llvm::Triple::wasm32:
+      case llvm::Triple::wasm64:
+        TC = new toolchains::WebAssembly(*this, Target, Args);
+        break;
       default:
         if (Target.isOSBinFormatELF())
           TC = new toolchains::Generic_ELF(*this, Target, Args);
         else if (Target.isOSBinFormatMachO())
           TC = new toolchains::MachO(*this, Target, Args);
         else
           TC = new toolchains::Generic_GCC(*this, Target, Args);
       }

lib/Driver/ToolChains.h

protected:
   Tool *buildAssembler() const override;
   Tool *buildLinker() const override;
 
 private:
   mutable std::unique_ptr<Tool> Compiler;
   mutable std::unique_ptr<Tool> Assembler;
 };
 
+class LLVM_LIBRARY_VISIBILITY WebAssembly final : public ToolChain {
+public:
+  WebAssembly(const Driver &D, const llvm::Triple &Triple,
+              const llvm::opt::ArgList &Args)
+      : ToolChain(D, Triple, Args) {}
+
+private:
+  bool IsMathErrnoDefault() const override;
+  bool IsObjCNonFragileABIDefault() const override;
+  bool UseObjCMixedDispatch() const override;
+  bool isPICDefault() const override;
+  bool isPIEDefault() const override;
+  bool isPICDefaultForced() const override;
+  bool IsIntegratedAssemblerDefault() const override;
+  bool hasBlocksRuntime() const override;
+  bool SupportsObjCGC() const override;
+  bool SupportsProfiling() const override;
+  void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
+                             llvm::opt::ArgStringList &CC1Args) const override;
+};
+
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang
 
 #endif

lib/Driver/ToolChains.cpp

Tool *SHAVEToolChain::buildLinker() const {
   llvm_unreachable("SHAVEToolChain can't buildLinker");
 }
 
 Tool *SHAVEToolChain::buildAssembler() const {
   // This one you'd think should be reachable since we expose an
   // assembler to the driver, except not the way it expects.
   llvm_unreachable("SHAVEToolChain can't buildAssembler");
 }
+
+bool WebAssembly::IsMathErrnoDefault() const { return false; }
+
+bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
+
+bool WebAssembly::UseObjCMixedDispatch() const { return true; }
+
+bool WebAssembly::isPICDefault() const { return false; }
+
+bool WebAssembly::isPIEDefault() const { return false; }
+
+bool WebAssembly::isPICDefaultForced() const { return false; }
+
+bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
+
+// TODO: Support Objective C stuff.
+bool WebAssembly::SupportsObjCGC() const { return false; }
+
+bool WebAssembly::hasBlocksRuntime() const { return false; }
+
+// TODO: Support profiling.
+bool WebAssembly::SupportsProfiling() const { return false; }
+
+void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
+                                        ArgStringList &CC1Args) const {
+  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
+                         options::OPT_fno_use_init_array, true))
+    CC1Args.push_back("-fuse-init-array");
+}

lib/Driver/Tools.cpp

 }
 
 static bool isNoCommonDefault(const llvm::Triple &Triple) {
   switch (Triple.getArch()) {
   default:
     return false;
 
   case llvm::Triple::xcore:
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
     return true;
   }
 }
 
 // ARM tools start.
 
 // Get SubArch (vN).
 static int getARMSubArchVersionNumber(const llvm::Triple &Triple) {
static const char *getX86TargetCPU(const ArgList &Args,
   case llvm::Triple::Haiku:
     return "i586";
   case llvm::Triple::Bitrig:
     return "i686";
   default:
     // Fallback to p4.
     return "pentium4";
   }
 }
 
+/// Get the (LLVM) name of the WebAssembly cpu we are targeting.
+static StringRef getWebAssemblyTargetCPU(const ArgList &Args) {
+  // If we have -mcpu=, use that.
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    StringRef CPU = A->getValue();
+
+#ifdef __wasm__
+    // Handle "native" by examining the host.
+    if (CPU == "native")
+      return llvm::sys::getHostCPUName();
+#endif
+
+    return CPU;
+  }
+
+  return "generic";
+}
+
 static std::string getCPUName(const ArgList &Args, const llvm::Triple &T,
                               bool FromAs = false) {
   switch (T.getArch()) {
   default:
     return "";
 
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be:
case llvm::Triple::hexagon:
     return "hexagon" + toolchains::HexagonToolChain::GetTargetCPU(Args).str();
 
   case llvm::Triple::systemz:
     return getSystemZTargetCPU(Args);
 
   case llvm::Triple::r600:
   case llvm::Triple::amdgcn:
     return getR600TargetGPU(Args);
+
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+    return getWebAssemblyTargetCPU(Args);
   }
 }
 
 static void AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
                           ArgStringList &CmdArgs) {
   // Tell the linker to load the plugin. This has to come before AddLinkerInputs
   // as gold requires -plugin to come before any -plugin-opt that -Wl might
   // forward.
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
                                options::OPT_munaligned_access))
     if (A->getOption().matches(options::OPT_mno_unaligned_access))
       Features.push_back("+strict-align");
 
   if (Args.hasArg(options::OPT_ffixed_x18) || Triple.isOSDarwin())
     Features.push_back("+reserve-x18");
 }
 
+static void getWebAssemblyTargetFeatures(const ArgList &Args,
+                                         std::vector<const char *> &Features) {
+  for (const Arg *A : Args.filtered(options::OPT_m_wasm_Features_Group)) {
+    StringRef Name = A->getOption().getName();
+    A->claim();
+
+    // Skip over "-m".
+    assert(Name.startswith("m") && "Invalid feature name.");
+    Name = Name.substr(1);
+
+    bool IsNegative = Name.startswith("no-");
+    if (IsNegative)
+      Name = Name.substr(3);
+
+    Features.push_back(Args.MakeArgString((IsNegative ? "-" : "+") + Name));
+  }
+}
+
 static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,
                               const ArgList &Args, ArgStringList &CmdArgs,
                               bool ForAS) {
   std::vector<const char *> Features;
   switch (Triple.getArch()) {
   default:
     break;
   case llvm::Triple::mips:
static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be:
     getAArch64TargetFeatures(D, Triple, Args, Features);
     break;
   case llvm::Triple::x86:
   case llvm::Triple::x86_64:
     getX86TargetFeatures(D, Triple, Args, Features);
     break;
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+    getWebAssemblyTargetFeatures(Args, Features);
+    break;
   }
 
   // Find the last of each feature.
   llvm::StringMap<unsigned> LastOpt;
   for (unsigned I = 0, N = Features.size(); I < N; ++I) {
     const char *Name = Features[I];
     assert(Name[0] == '-' || Name[0] == '+');
     LastOpt[Name + 1] = I;
static bool areOptimizationsEnabled(const ArgList &Args) {
   if (Arg *A = Args.getLastArg(options::OPT_O_Group))
     return !A->getOption().matches(options::OPT_O0);
   // Defaults to -O0.
   return false;
 }
 
 static bool shouldUseFramePointerForTarget(const ArgList &Args,
                                            const llvm::Triple &Triple) {
+  switch (Triple.getArch()) {
+  case llvm::Triple::xcore:
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
     // XCore never wants frame pointers, regardless of OS.
-  if (Triple.getArch() == llvm::Triple::xcore) {
+    // WebAssembly never wants frame pointers.
     return false;
+  default:
+    break;
   }
 
   if (Triple.isOSLinux()) {
     switch (Triple.getArch()) {
     // Don't use a frame pointer on linux if optimizing for certain targets.
     case llvm::Triple::mips64:
     case llvm::Triple::mips64el:
     case llvm::Triple::mips:

test/CodeGen/align-wasm.c

-// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s
-// PR5599
+// RUN: %clang_cc1 -triple wasm32-unknown-unknown -emit-llvm %s -o - \
+// RUN:   | FileCheck %s
+// RUN: %clang_cc1 -triple wasm64-unknown-unknown -emit-llvm %s -o - \
+// RUN:   | FileCheck %s
 
 void test1_f(void *);
 
 void test1_g(void) {
   float x[4];
   test1_f(x);
 }
 // CHECK: @test1_g
 // CHECK: alloca [4 x float], align 16

test/CodeGen/builtins-wasm.c

+// RUN: %clang_cc1 -triple wasm32-unknown-unknown -O3 -emit-llvm -o - %s \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY32
+// RUN: %clang_cc1 -triple wasm64-unknown-unknown -O3 -emit-llvm -o - %s \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY64
+
+__SIZE_TYPE__ f0(void) {
+  return __builtin_wasm_page_size();
+// WEBASSEMBLY32: call {{i.*}} @llvm.wasm.page.size.i32()
+// WEBASSEMBLY64: call {{i.*}} @llvm.wasm.page.size.i64()
+}

test/CodeGen/target-data.c

 // RUN: %clang_cc1 -triple mipsel-nacl -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=MIPS-NACL
 // MIPS-NACL: target datalayout = "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
 
 // RUN: %clang_cc1 -triple le32-nacl -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=LE32-NACL
 // LE32-NACL: target datalayout = "e-p:32:32-i64:64"
 
+// RUN: %clang_cc1 -triple wasm32-unknown-unknown -o - -emit-llvm %s | \
+// RUN: FileCheck %s -check-prefix=WEBASSEMBLY32
+// WEBASSEMBLY32: target datalayout = "e-p:32:32-i64:64-v128:8:128-n32:64-S128"
+
+// RUN: %clang_cc1 -triple wasm64-unknown-unknown -o - -emit-llvm %s | \
+// RUN: FileCheck %s -check-prefix=WEBASSEMBLY64
+// WEBASSEMBLY64: target datalayout = "e-p:64:64-i64:64-v128:8:128-n32:64-S128"
+
 // RUN: %clang_cc1 -triple powerpc-unknown -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=PPC
 // PPC: target datalayout = "E-m:e-p:32:32-i64:64-n32"
 
 // RUN: %clang_cc1 -triple powerpc64-freebsd -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=PPC64-FREEBSD
 // PPC64-FREEBSD: target datalayout = "E-m:e-i64:64-n32:64"
 

test/CodeGen/wasm-arguments.c

+// RUN: %clang_cc1 -triple wasm32-unknown-unknown %s -emit-llvm -o - \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY32
+// RUN: %clang_cc1 -triple wasm64-unknown-unknown %s -emit-llvm -o - \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY64
+
+// Basic argument/attribute tests for WebAssembly
+
+// WEBASSEMBLY32: define void @f0(i32 %i, i32 %j, i64 %k, double %l, double %m)
+// WEBASSEMBLY64: define void @f0(i32 %i, i64 %j, i64 %k, double %l, double %m)
+void f0(int i, long j, long long k, double l, long double m) {}
+
+typedef struct {
+  int aa;
+  int bb;
+} s1;
+// Structs should be passed byval and not split up.
+// WEBASSEMBLY32: define void @f1(%struct.s1* byval align 4 %i)
+// WEBASSEMBLY64: define void @f1(%struct.s1* byval align 4 %i)
+void f1(s1 i) {}
+
+typedef struct {
+  int cc;
+} s2;
+// Single-element structs should be returned as the one element.
+// WEBASSEMBLY32: define i32 @f2()
+// WEBASSEMBLY64: define i32 @f2()
+s2 f2() {
+  s2 foo;
+  return foo;
+}
+
+typedef struct {
+  int cc;
+  int dd;
+} s3;
+// Structs should be returned sret and not simplified by the frontend.
+// WEBASSEMBLY32: define void @f3(%struct.s3* noalias sret %agg.result)
+// WEBASSEMBLY64: define void @f3(%struct.s3* noalias sret %agg.result)
+s3 f3() {
+  s3 foo;
+  return foo;
+}
+
+// WEBASSEMBLY32: define void @f4(i64 %i)
+// WEBASSEMBLY64: define void @f4(i64 %i)
+void f4(long long i) {}
+
+// i8/i16 should be signext, i32 and higher should not.
+// WEBASSEMBLY32: define void @f5(i8 signext %a, i16 signext %b)
+// WEBASSEMBLY64: define void @f5(i8 signext %a, i16 signext %b)
+void f5(char a, short b) {}
+
+// WEBASSEMBLY32: define void @f6(i8 zeroext %a, i16 zeroext %b)
+// WEBASSEMBLY64: define void @f6(i8 zeroext %a, i16 zeroext %b)
+void f6(unsigned char a, unsigned short b) {}
+
+
+enum my_enum {
+  ENUM1,
+  ENUM2,
+  ENUM3,
+};
+// Enums should be treated as the underlying i32.
+// WEBASSEMBLY32: define void @f7(i32 %a)
+// WEBASSEMBLY64: define void @f7(i32 %a)
+void f7(enum my_enum a) {}
+
+enum my_big_enum {
+  ENUM4 = 0xFFFFFFFFFFFFFFFF,
+};
+// Big enums should be treated as the underlying i64.
+// WEBASSEMBLY32: define void @f8(i64 %a)
+// WEBASSEMBLY64: define void @f8(i64 %a)
+void f8(enum my_big_enum a) {}
+
+union simple_union {
+  int a;
+  char b;
+};
+// Unions should be passed as byval structs.
+// WEBASSEMBLY32: define void @f9(%union.simple_union* byval align 4 %s)
+// WEBASSEMBLY64: define void @f9(%union.simple_union* byval align 4 %s)
+void f9(union simple_union s) {}
+
+typedef struct {
+  int b4 : 4;
+  int b3 : 3;
+  int b8 : 8;
+} bitfield1;
+// Bitfields should be passed as byval structs.
+// WEBASSEMBLY32: define void @f10(%struct.bitfield1* byval align 4 %bf1)
+// WEBASSEMBLY64: define void @f10(%struct.bitfield1* byval align 4 %bf1)
+void f10(bitfield1 bf1) {}

test/CodeGen/wasm-regparm.c

+// RUN: %clang_cc1 -triple wasm32-unknown-unknown %s -fsyntax-only -verify
+// RUN: %clang_cc1 -triple wasm64-unknown-unknown %s -fsyntax-only -verify
+
+void __attribute__((regparm(2))) fc_f1(int i, int j, int k) {} // expected-error{{'regparm' is not valid on this platform}}

test/CodeGenCXX/constructor-destructor-return-this.cpp

 //RUN: %clang_cc1 %s -emit-llvm -o - -triple=i686-unknown-linux | FileCheck --check-prefix=CHECKGEN %s
 //RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-apple-ios6.0 -target-abi apcs-gnu | FileCheck --check-prefix=CHECKARM %s
 //RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-apple-ios5.0 -target-abi apcs-gnu | FileCheck --check-prefix=CHECKIOS5 %s
+//RUN: %clang_cc1 %s -emit-llvm -o - -triple=wasm32-unknown-unknown \
+//RUN:   | FileCheck --check-prefix=CHECKARM %s
 //RUN: %clang_cc1 %s -emit-llvm -o - -triple=i386-pc-win32 -fno-rtti | FileCheck --check-prefix=CHECKMS %s
 // FIXME: these tests crash on the bots when run with -triple=x86_64-pc-win32
 
 // Make sure we attach the 'returned' attribute to the 'this' parameter of
 // constructors and destructors which return this (and only these cases)
 
 class A {
 public:

test/CodeGenCXX/member-alignment.cpp

-// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - | \
+// RUN: FileCheck -check-prefix CHECK-ITANIUM %s
+// RUN: %clang_cc1 -emit-llvm -triple wasm32-unknown-unknown %s -o - | \
+// RUN: FileCheck -check-prefix CHECK-WEBASSEMBLY32 %s
+// RUN: %clang_cc1 -emit-llvm -triple wasm64-unknown-unknown %s -o - | \
+// RUN: FileCheck -check-prefix CHECK-WEBASSEMBLY64 %s
 
 // rdar://7268289
 
 class t {
 public:
   virtual void foo(void);
   void bar(void);
 };
 
 void
 t::bar(void) {
-// CHECK: _ZN1t3barEv{{.*}} align 2
+// CHECK-ITANIUM: @_ZN1t3barEv({{.*}}) #0 align 2 {
+// CHECK-WEBASSEMBLY32: @_ZN1t3barEv({{.*}}) #0 {
+// CHECK-WEBASSEMBLY64: @_ZN1t3barEv({{.*}}) #0 {
 }
 
 void
 t::foo(void) {
-// CHECK: _ZN1t3fooEv{{.*}} align 2
+// CHECK-ITANIUM: @_ZN1t3fooEv({{.*}}) unnamed_addr #0 align 2 {
+// CHECK-WEBASSEMBLY32: @_ZN1t3fooEv({{.*}}) unnamed_addr #0 {
+// CHECK-WEBASSEMBLY64: @_ZN1t3fooEv({{.*}}) unnamed_addr #0 {
 }

test/CodeGenCXX/member-function-pointers.cpp

 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=x86_64-unknown-unknown | FileCheck -check-prefix CODE-LP64 %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=i386-unknown-unknown | FileCheck -check-prefix CODE-LP32 %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=x86_64-unknown-unknown | FileCheck -check-prefix GLOBAL-LP64 %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=i386-unknown-unknown | FileCheck -check-prefix GLOBAL-LP32 %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-unknown | FileCheck -check-prefix GLOBAL-ARM %s
 
 // PNaCl uses the same representation of method pointers as ARM.
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=le32-unknown-nacl | FileCheck -check-prefix GLOBAL-ARM %s
 // MIPS uses the same representation of method pointers as ARM.
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=mips-unknown-linux-gnu | FileCheck -check-prefix GLOBAL-ARM %s
+// WebAssembly uses the same representation of method pointers as ARM.
+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=wasm32-unknown-unknown | FileCheck -check-prefix GLOBAL-ARM %s
 
 struct A { int a; void f(); virtual void vf1(); virtual void vf2(); };
 struct B { int b; virtual void g(); };
 struct C : B, A { };
 
 void (A::*pa)();
 void (A::*volatile vpa)();
 void (B::*pb)();

test/CodeGenCXX/static-init-wasm.cpp

+// RUN: %clang_cc1 -emit-llvm -triple=wasm32-unknown-unknown -o - %s \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY32
+// RUN: %clang_cc1 -emit-llvm -triple=wasm64-unknown-unknown -o - %s \
+// RUN:   | FileCheck %s -check-prefix=WEBASSEMBLY64
+
+// Test that we don't create common blocks.
+int tentative;
+// WEBASSEMBLY32: @tentative = global i32 0, align 4
+// WEBASSEMBLY64: @tentative = global i32 0, align 4
+
+// Test that WebAssembly uses the ARM-style ABI in which the static
+// variable's guard variable is tested via "load i8 and test the
+// bottom bit" rather than the Itanium/x86 ABI which uses "load i8
+// and compare with zero".
+int f();
+void g() {
+  static int a = f();
+}
+// WEBASSEMBLY32-LABEL: @_Z1gv()
+// WEBASSEMBLY32:       %[[R0:.+]] = load atomic i8, i8* bitcast (i32* @_ZGVZ1gvE1a to i8*) acquire, align 1
+// WEBASSEMBLY32-NEXT:  %[[R1:.+]] = and i8 %[[R0]], 1
+// WEBASSEMBLY32-NEXT:  %[[R2:.+]] = icmp eq i8 %[[R1]], 0
+// WEBASSEMBLY32-NEXT:  br i1 %[[R2]], label %[[CHECK:.+]], label %[[END:.+]]
+// WEBASSEMBLY32:       [[CHECK]]
+// WEBASSEMBLY32:       call i32 @__cxa_guard_acquire
+// WEBASSEMBLY32:       [[END]]
+// WEBASSEMBLY32:       call void @__cxa_guard_release
+//
+// WEBASSEMBLY64-LABEL: @_Z1gv()
+// WEBASSEMBLY64:       %[[R0:.+]] = load atomic i8, i8* bitcast (i64* @_ZGVZ1gvE1a to i8*) acquire, align 1
+// WEBASSEMBLY64-NEXT:  %[[R1:.+]] = and i8 %[[R0]], 1
+// WEBASSEMBLY64-NEXT:  %[[R2:.+]] = icmp eq i8 %[[R1]], 0
+// WEBASSEMBLY64-NEXT:  br i1 %[[R2]], label %[[CHECK:.+]], label %[[END:.+]]
+// WEBASSEMBLY64:       [[CHECK]]
+// WEBASSEMBLY64:       call i32 @__cxa_guard_acquire
+// WEBASSEMBLY64:       [[END]]
+// WEBASSEMBLY64:       call void @__cxa_guard_release
+
+// Test various aspects of static constructor calls.
+struct A {
+    A();
+};
+
+A theA;
+
+// WEBASSEMBLY32: define internal void @__cxx_global_var_init() #0 section ".text.__startup" {
+// WEBASSEMBLY32: call %struct.A* @_ZN1AC1Ev(%struct.A* @theA)
+// WEBASSEMBLY32: define internal void @_GLOBAL__sub_I_static_init_wasm.cpp() #0 section ".text.__startup" {
+// WEBASSEMBLY32: call void @__cxx_global_var_init()
+//
+// WEBASSEMBLY64: define internal void @__cxx_global_var_init() #0 section ".text.__startup" {
+// WEBASSEMBLY64: call %struct.A* @_ZN1AC1Ev(%struct.A* @theA)
+// WEBASSEMBLY64: define internal void @_GLOBAL__sub_I_static_init_wasm.cpp() #0 section ".text.__startup" {
+// WEBASSEMBLY64: call void @__cxx_global_var_init()

test/CodeGenCXX/wasm-args-returns.cpp

+// RUN: %clang_cc1 -O1 -triple wasm32-unknown-unknown -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -O1 -triple wasm64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
+
+#define concat_(x, y) x ## y
+#define concat(x, y) concat_(x, y)
+
+#define test(T) \
+  T arg(T x) { return x; } \
+  void use(T x); \
+  T concat(def_, T)(void); \
+  void concat(test_, T)(void) { use(concat(def_, T)()); }
+
+struct one_field { double d; };
+test(one_field);
+// CHECK: define double @_Z3arg9one_field(double %{{.*}})
+//
+// CHECK: define void @_Z14test_one_fieldv()
+// CHECK: %[[call:.*]] = tail call double @_Z13def_one_fieldv()
+// CHECK: tail call void @_Z3use9one_field(double %[[call]])
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use9one_field(double)
+// CHECK: declare double @_Z13def_one_fieldv()
+
+struct two_fields { double d, e; };
+test(two_fields);
+// CHECK: define void @_Z3arg10two_fields(%struct.two_fields* noalias nocapture sret %{{.*}}, %struct.two_fields* byval nocapture readonly align 8 %{{.*}})
+//
+// CHECK: define void @_Z15test_two_fieldsv()
+// CHECK: %[[tmp:.*]] = alloca %struct.two_fields, align 8
+// CHECK: call void @_Z14def_two_fieldsv(%struct.two_fields* nonnull sret %[[tmp]])
+// CHECK: call void @_Z3use10two_fields(%struct.two_fields* byval nonnull align 8 %[[tmp]])
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use10two_fields(%struct.two_fields* byval align 8)
+// CHECK: declare void @_Z14def_two_fieldsv(%struct.two_fields* sret)
+
+struct copy_ctor {
+    double d;
+    copy_ctor(copy_ctor const&);
+};
+test(copy_ctor);
+// CHECK: define void @_Z3arg9copy_ctor(%struct.copy_ctor* noalias sret %{{.*}}, %struct.copy_ctor* align 8 %{{.*}})
+//
+// CHECK: declare %struct.copy_ctor* @_ZN9copy_ctorC1ERKS_(%struct.copy_ctor* returned, %struct.copy_ctor* dereferenceable(8))
+//
+// CHECK: define void @_Z14test_copy_ctorv()
+// CHECK: %[[tmp:.*]] = alloca %struct.copy_ctor, align 8
+// CHECK: call void @_Z13def_copy_ctorv(%struct.copy_ctor* nonnull sret %[[tmp]])
+// CHECK: call void @_Z3use9copy_ctor(%struct.copy_ctor* nonnull align 8 %[[tmp]])
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use9copy_ctor(%struct.copy_ctor* align 8)
+// CHECK: declare void @_Z13def_copy_ctorv(%struct.copy_ctor* sret)
+
+struct __attribute__((aligned(16))) aligned_copy_ctor {
+    double d, e;
+    aligned_copy_ctor(aligned_copy_ctor const&);
+};
+test(aligned_copy_ctor);
+// CHECK: define void @_Z3arg17aligned_copy_ctor(%struct.aligned_copy_ctor* noalias sret %{{.*}}, %struct.aligned_copy_ctor* align 16 %{{.*}})
+//
+// CHECK: declare %struct.aligned_copy_ctor* @_ZN17aligned_copy_ctorC1ERKS_(%struct.aligned_copy_ctor* returned, %struct.aligned_copy_ctor* dereferenceable(16))
+//
+// CHECK: define void @_Z22test_aligned_copy_ctorv()
+// CHECK: %[[tmp:.*]] = alloca %struct.aligned_copy_ctor, align 16
+// CHECK: call void @_Z21def_aligned_copy_ctorv(%struct.aligned_copy_ctor* nonnull sret %[[tmp]])
+// CHECK: call void @_Z3use17aligned_copy_ctor(%struct.aligned_copy_ctor* nonnull align 16 %[[tmp]])
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use17aligned_copy_ctor(%struct.aligned_copy_ctor* align 16)
+// CHECK: declare void @_Z21def_aligned_copy_ctorv(%struct.aligned_copy_ctor* sret)
+
+struct empty {};
+test(empty);
+// CHECK: define void @_Z3arg5empty()
+//
+// CHECK: define void @_Z10test_emptyv()
+// CHECK: tail call void @_Z9def_emptyv()
+// CHECK: tail call void @_Z3use5empty()
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use5empty()
+// CHECK: declare void @_Z9def_emptyv()
+
+struct one_bitfield {
+    int d:3;
+};
+test(one_bitfield);
+// CHECK: define i32 @_Z3arg12one_bitfield(i32 %{{.*}})
+//
+// CHECK: define void @_Z17test_one_bitfieldv()
+// CHECK: %[[call:.*]] = tail call i32 @_Z16def_one_bitfieldv()
+// CHECK: tail call void @_Z3use12one_bitfield(i32 %[[call]])
+// CHECK: ret void
+//
+// CHECK: declare void @_Z3use12one_bitfield(i32)
+// CHECK: declare i32 @_Z16def_one_bitfieldv()

test/Driver/wasm32-unknown-unknown.cpp

+// RUN: %clang -target wasm32-unknown-unknown -### %s -emit-llvm-only -c 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=ECHO
+// RUN: %clang -target wasm32-unknown-unknown %s -emit-llvm -S -o - \
+// RUN:   | FileCheck %s
+// RUN: %clang -target wasm32-unknown-unknown %s -emit-llvm -S -pthread -o - \
+// RUN:   | FileCheck %s -check-prefix=THREADS
+
+// ECHO: {{.*}} "-cc1" {{.*}}wasm32-unknown-unknown.c
+
+typedef __builtin_va_list va_list;
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+
+extern "C" {
+
+// CHECK: @align_c = global i32 1
+int align_c = __alignof(char);
+
+// CHECK: @align_s = global i32 2
+int align_s = __alignof(short);
+
+// CHECK: @align_i = global i32 4
+int align_i = __alignof(int);
+
+// CHECK: @align_l = global i32 4
+int align_l = __alignof(long);
+
+// CHECK: @align_ll = global i32 8
+int align_ll = __alignof(long long);
+
+// CHECK: @align_p = global i32 4
+int align_p = __alignof(void*);
+
+// CHECK: @align_f = global i32 4
+int align_f = __alignof(float);
+
+// CHECK: @align_d = global i32 8
+int align_d = __alignof(double);
+
+// CHECK: @align_ld = global i32 8
+int align_ld = __alignof(long double);
+
+// CHECK: @align_vl = global i32 4
+int align_vl = __alignof(va_list);
+
+// CHECK: _GNU_SOURCEdefined
+#ifdef _GNU_SOURCE
+void _GNU_SOURCEdefined() {}
+#endif
+
+// THREADS: _REENTRANTdefined
+// CHECK: _REENTRANTundefined
+#ifdef _REENTRANT
+void _REENTRANTdefined() {}
+#else
+void _REENTRANTundefined() {}
+#endif
+
+// Check types
+
+// CHECK: signext i8 @check_char()
+char check_char() { return 0; }
+
+// CHECK: signext i16 @check_short()
+short check_short() { return 0; }
+
+// CHECK: i32 @check_int()
+int check_int() { return 0; }
+
+// CHECK: i32 @check_long()
+long check_long() { return 0; }
+
+// CHECK: i64 @check_longlong()
+long long check_longlong() { return 0; }
+
+// CHECK: zeroext i8 @check_uchar()
+unsigned char check_uchar() { return 0; }
+
+// CHECK: zeroext i16 @check_ushort()
+unsigned short check_ushort() { return 0; }
+
+// CHECK: i32 @check_uint()
+unsigned int check_uint() { return 0; }
+
+// CHECK: i32 @check_ulong()
+unsigned long check_ulong() { return 0; }
+
+// CHECK: i64 @check_ulonglong()
+unsigned long long check_ulonglong() { return 0; }
+
+// CHECK: i32 @check_size_t()
+size_t check_size_t() { return 0; }
+
+// CHECK: float @check_float()
+float check_float() { return 0; }
+
+// CHECK: double @check_double()
+double check_double() { return 0; }
+
+// CHECK: double @check_longdouble()
+long double check_longdouble() { return 0; }
+
+}
+
+template<int> void Switch();
+template<> void Switch<4>();
+template<> void Switch<8>();
+template<> void Switch<16>();
+
+void check_pointer_size() {
+  // CHECK: SwitchILi4
+  Switch<sizeof(void*)>();
+
+  // CHECK: SwitchILi8
+  Switch<sizeof(long long)>();
+
+  // CHECK: SwitchILi4
+  Switch<sizeof(va_list)>();
+}

test/Driver/wasm64-unknown-unknown.cpp

+// RUN: %clang -target wasm64-unknown-unknown -### %s -emit-llvm-only -c 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=ECHO
+// RUN: %clang -target wasm64-unknown-unknown %s -emit-llvm -S -o - \
+// RUN:   | FileCheck %s
+// RUN: %clang -target wasm64-unknown-unknown %s -emit-llvm -S -pthread -o - \
+// RUN:   | FileCheck %s -check-prefix=THREADS
+
+// ECHO: {{.*}} "-cc1" {{.*}}wasm64-unknown-unknown.c
+
+typedef __builtin_va_list va_list;
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+
+extern "C" {
+
+// CHECK: @align_c = global i32 1
+int align_c = __alignof(char);
+
+// CHECK: @align_s = global i32 2
+int align_s = __alignof(short);
+
+// CHECK: @align_i = global i32 4
+int align_i = __alignof(int);
+
+// CHECK: @align_l = global i32 8
+int align_l = __alignof(long);
+
+// CHECK: @align_ll = global i32 8
+int align_ll = __alignof(long long);
+
+// CHECK: @align_p = global i32 8
+int align_p = __alignof(void*);
+
+// CHECK: @align_f = global i32 4
+int align_f = __alignof(float);
+
+// CHECK: @align_d = global i32 8
+int align_d = __alignof(double);
+
+// CHECK: @align_ld = global i32 8
+int align_ld = __alignof(long double);
+
+// CHECK: @align_vl = global i32 8
+int align_vl = __alignof(va_list);
+
+// CHECK: _GNU_SOURCEdefined
+#ifdef _GNU_SOURCE
+void _GNU_SOURCEdefined() {}
+#endif
+
+// THREADS: _REENTRANTdefined
+// CHECK: _REENTRANTundefined
+#ifdef _REENTRANT
+void _REENTRANTdefined() {}
+#else
+void _REENTRANTundefined() {}
+#endif
+
+// Check types
+
+// CHECK: signext i8 @check_char()
+char check_char() { return 0; }
+
+// CHECK: signext i16 @check_short()
+short check_short() { return 0; }
+
+// CHECK: i32 @check_int()
+int check_int() { return 0; }
+
+// CHECK: i64 @check_long()
+long check_long() { return 0; }
+
+// CHECK: i64 @check_longlong()
+long long check_longlong() { return 0; }
+
+// CHECK: zeroext i8 @check_uchar()
+unsigned char check_uchar() { return 0; }
+
+// CHECK: zeroext i16 @check_ushort()
+unsigned short check_ushort() { return 0; }
+
+// CHECK: i32 @check_uint()
+unsigned int check_uint() { return 0; }
+
+// CHECK: i64 @check_ulong()
+unsigned long check_ulong() { return 0; }
+
+// CHECK: i64 @check_ulonglong()
+unsigned long long check_ulonglong() { return 0; }
+
+// CHECK: i64 @check_size_t()
+size_t check_size_t() { return 0; }
+
+// CHECK: float @check_float()
+float check_float() { return 0; }
+
+// CHECK: double @check_double()
+double check_double() { return 0; }
+
+// CHECK: double @check_longdouble()
+long double check_longdouble() { return 0; }
+
+}
+
+template<int> void Switch();
+template<> void Switch<4>();
+template<> void Switch<8>();
+template<> void Switch<16>();
+
+void check_pointer_size() {
+  // CHECK: SwitchILi8
+  Switch<sizeof(void*)>();
+
+  // CHECK: SwitchILi8
+  Switch<sizeof(long long)>();
+
+  // CHECK: SwitchILi8
+  Switch<sizeof(va_list)>();
+}

test/Preprocessor/init.c

 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-unknown-freebsd < /dev/null | FileCheck -check-prefix PPC64-FREEBSD %s
 // PPC64-FREEBSD-NOT: #define __LONG_DOUBLE_128__ 1
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=xcore-none-none < /dev/null | FileCheck -check-prefix XCORE %s
 // XCORE:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
 // XCORE:#define __LITTLE_ENDIAN__ 1
 // XCORE:#define __XS1B__ 1
+//
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=wasm32-unknown-unknown \
+// RUN:   < /dev/null \
+// RUN:   | FileCheck -check-prefix=WEBASSEMBLY32 %s
+//
+// WEBASSEMBLY32:#define _ILP32 1{{$}}
+// WEBASSEMBLY32-NOT:#define _LP64
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_ACQUIRE 2{{$}}
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_ACQ_REL 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_CONSUME 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_RELAXED 0{{$}}
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_RELEASE 3{{$}}
+// WEBASSEMBLY32-NEXT:#define __ATOMIC_SEQ_CST 5{{$}}
+// WEBASSEMBLY32-NEXT:#define __BIGGEST_ALIGNMENT__ 16{{$}}
+// WEBASSEMBLY32-NEXT:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__{{$}}
+// WEBASSEMBLY32-NEXT:#define __CHAR16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY32-NEXT:#define __CHAR32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __CHAR_BIT__ 8{{$}}
+// WEBASSEMBLY32-NEXT:#define __CONSTANT_CFSTRINGS__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_DECIMAL_DIG__ 17{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_DIG__ 15{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_EPSILON__ 2.2204460492503131e-16{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MANT_DIG__ 53{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MAX_10_EXP__ 308{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MAX_EXP__ 1024{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MAX__ 1.7976931348623157e+308{{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MIN_10_EXP__ (-307){{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MIN_EXP__ (-1021){{$}}
+// WEBASSEMBLY32-NEXT:#define __DBL_MIN__ 2.2250738585072014e-308{{$}}
+// WEBASSEMBLY32-NEXT:#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__{{$}}
+// WEBASSEMBLY32-NOT:#define __ELF__
+// WEBASSEMBLY32-NEXT:#define __FINITE_MATH_ONLY__ 0{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_DECIMAL_DIG__ 9{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_DENORM_MIN__ 1.40129846e-45F{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_DIG__ 6{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_EPSILON__ 1.19209290e-7F{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_EVAL_METHOD__ 0{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MANT_DIG__ 24{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MAX_10_EXP__ 38{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MAX_EXP__ 128{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MAX__ 3.40282347e+38F{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MIN_10_EXP__ (-37){{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MIN_EXP__ (-125){{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_MIN__ 1.17549435e-38F{{$}}
+// WEBASSEMBLY32-NEXT:#define __FLT_RADIX__ 2{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_BOOL_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_CHAR_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_INT_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_LLONG_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_LONG_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_POINTER_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_SHORT_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GNUC_MINOR__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __GNUC_PATCHLEVEL__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __GNUC_STDC_INLINE__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __GNUC__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __GXX_ABI_VERSION 1002{{$}}
+// WEBASSEMBLY32-NEXT:#define __GXX_RTTI 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __ILP32__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT16_C_SUFFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __INT16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT16_MAX__ 32767{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT16_TYPE__ short{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT32_C_SUFFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __INT32_FMTd__ "d"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT32_FMTi__ "i"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT32_TYPE__ int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT64_C_SUFFIX__ LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT64_FMTd__ "lld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT64_FMTi__ "lli"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT64_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT64_TYPE__ long long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT8_C_SUFFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __INT8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT8_MAX__ 127{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT8_TYPE__ signed char{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_C_SUFFIX__ LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_FMTd__ "lld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_FMTi__ "lli"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_TYPE__ long long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTMAX_WIDTH__ 64{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTPTR_FMTd__ "ld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTPTR_FMTi__ "li"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTPTR_MAX__ 2147483647L{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTPTR_TYPE__ long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INTPTR_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST16_MAX__ 32767{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST16_TYPE__ short{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST32_FMTd__ "d"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST32_FMTi__ "i"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST32_TYPE__ int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST64_FMTd__ "lld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST64_FMTi__ "lli"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST64_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST64_TYPE__ long long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST8_MAX__ 127{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_FAST8_TYPE__ signed char{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST16_MAX__ 32767{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST16_TYPE__ short{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST32_FMTd__ "d"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST32_FMTi__ "i"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST32_TYPE__ int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST64_FMTd__ "lld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST64_FMTi__ "lli"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST64_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST64_TYPE__ long long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST8_MAX__ 127{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_LEAST8_TYPE__ signed char{{$}}
+// WEBASSEMBLY32-NEXT:#define __INT_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_DECIMAL_DIG__ 17{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_DIG__ 15{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_EPSILON__ 2.2204460492503131e-16L{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MANT_DIG__ 53{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MAX_10_EXP__ 308{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MAX_EXP__ 1024{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MAX__ 1.7976931348623157e+308L{{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MIN_10_EXP__ (-307){{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MIN_EXP__ (-1021){{$}}
+// WEBASSEMBLY32-NEXT:#define __LDBL_MIN__ 2.2250738585072014e-308L{{$}}
+// WEBASSEMBLY32-NEXT:#define __LITTLE_ENDIAN__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __LONG_LONG_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY32-NEXT:#define __LONG_MAX__ 2147483647L{{$}}
+// WEBASSEMBLY32-NOT:#define __LP64__
+// WEBASSEMBLY32-NEXT:#define __NO_INLINE__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __ORDER_BIG_ENDIAN__ 4321{{$}}
+// WEBASSEMBLY32-NEXT:#define __ORDER_LITTLE_ENDIAN__ 1234{{$}}
+// WEBASSEMBLY32-NEXT:#define __ORDER_PDP_ENDIAN__ 3412{{$}}
+// WEBASSEMBLY32-NEXT:#define __POINTER_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __PRAGMA_REDEFINE_EXTNAME 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __PTRDIFF_FMTd__ "ld"{{$}}
+// WEBASSEMBLY32-NEXT:#define __PTRDIFF_FMTi__ "li"{{$}}
+// WEBASSEMBLY32-NEXT:#define __PTRDIFF_MAX__ 2147483647L{{$}}
+// WEBASSEMBLY32-NEXT:#define __PTRDIFF_TYPE__ long int{{$}}
+// WEBASSEMBLY32-NEXT:#define __PTRDIFF_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NOT:#define __REGISTER_PREFIX__
+// WEBASSEMBLY32-NEXT:#define __SCHAR_MAX__ 127{{$}}
+// WEBASSEMBLY32-NEXT:#define __SHRT_MAX__ 32767{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIG_ATOMIC_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIG_ATOMIC_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_DOUBLE__ 8{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_FLOAT__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_INT128__ 16{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_INT__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_LONG_DOUBLE__ 8{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_LONG_LONG__ 8{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_LONG__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_POINTER__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_PTRDIFF_T__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_SHORT__ 2{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_SIZE_T__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_WCHAR_T__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZEOF_WINT_T__ 4{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_FMTX__ "lX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_FMTo__ "lo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_FMTu__ "lu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_FMTx__ "lx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_MAX__ 4294967295UL{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __SIZE_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __STDC_HOSTED__ 0{{$}}
+// WEBASSEMBLY32-NEXT:#define __STDC_UTF_16__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __STDC_UTF_32__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __STDC_VERSION__ 201112L{{$}}
+// WEBASSEMBLY32-NEXT:#define __STDC__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_C_SUFFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_MAX__ 65535{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_C_SUFFIX__ U{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_FMTX__ "X"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_FMTo__ "o"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_FMTu__ "u"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_FMTx__ "x"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_C_SUFFIX__ ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_FMTX__ "llX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_FMTo__ "llo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_FMTu__ "llu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_FMTx__ "llx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT64_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_C_SUFFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_MAX__ 255{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_C_SUFFIX__ ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_FMTX__ "llX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_FMTo__ "llo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_FMTu__ "llu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_FMTx__ "llx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTMAX_WIDTH__ 64{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_FMTX__ "lX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_FMTo__ "lo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_FMTu__ "lu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_FMTx__ "lx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_MAX__ 4294967295UL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINTPTR_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_MAX__ 65535{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_FMTX__ "X"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_FMTo__ "o"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_FMTu__ "u"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_FMTx__ "x"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_FMTX__ "llX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_FMTo__ "llo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_FMTu__ "llu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_FMTx__ "llx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST64_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_MAX__ 255{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_FAST8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_MAX__ 65535{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_FMTX__ "X"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_FMTo__ "o"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_FMTu__ "u"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_FMTx__ "x"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_FMTX__ "llX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_FMTo__ "llo"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_FMTu__ "llu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_FMTx__ "llx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST64_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_MAX__ 255{{$}}
+// WEBASSEMBLY32-NEXT:#define __UINT_LEAST8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY32-NEXT:#define __USER_LABEL_PREFIX__ {{$}}
+// WEBASSEMBLY32-NEXT:#define __VERSION__ "{{.*}}"{{$}}
+// WEBASSEMBLY32-NEXT:#define __WCHAR_MAX__ 2147483647{{$}}
+// WEBASSEMBLY32-NEXT:#define __WCHAR_TYPE__ int{{$}}
+// WEBASSEMBLY32-NOT:#define __WCHAR_UNSIGNED__
+// WEBASSEMBLY32-NEXT:#define __WCHAR_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __WINT_TYPE__ int{{$}}
+// WEBASSEMBLY32-NOT:#define __WINT_UNSIGNED__
+// WEBASSEMBLY32-NEXT:#define __WINT_WIDTH__ 32{{$}}
+// WEBASSEMBLY32-NEXT:#define __clang__ 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __clang_major__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __clang_minor__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __clang_patchlevel__ {{.}}
+// WEBASSEMBLY32-NEXT:#define __clang_version__ "{{.*}}"{{$}}
+// WEBASSEMBLY32-NEXT:#define __llvm__ 1{{$}}
+// WEBASSEMBLY32-NOT:#define __wasm_simd128__
+// WEBASSEMBLY32-NOT:#define __wasm_simd256__
+// WEBASSEMBLY32-NOT:#define __wasm_simd512__
+// WEBASSEMBLY32-NOT:#define __unix
+// WEBASSEMBLY32-NOT:#define __unix__
+// WEBASSEMBLY32-NEXT:#define __wasm 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __wasm32 1{{$}}
+// WEBASSEMBLY32-NEXT:#define __wasm32__ 1{{$}}
+// WEBASSEMBLY32-NOT:#define __wasm64
+// WEBASSEMBLY32-NOT:#define __wasm64__
+// WEBASSEMBLY32-NEXT:#define __wasm__ 1{{$}}
+//
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=wasm64-unknown-unknown \
+// RUN:   < /dev/null \
+// RUN:   | FileCheck -check-prefix=WEBASSEMBLY64 %s
+//
+// WEBASSEMBLY64-NOT:#define _ILP32
+// WEBASSEMBLY64:#define _LP64 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_ACQUIRE 2{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_ACQ_REL 4{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_CONSUME 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_RELAXED 0{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_RELEASE 3{{$}}
+// WEBASSEMBLY64-NEXT:#define __ATOMIC_SEQ_CST 5{{$}}
+// WEBASSEMBLY64-NEXT:#define __BIGGEST_ALIGNMENT__ 16{{$}}
+// WEBASSEMBLY64-NEXT:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__{{$}}
+// WEBASSEMBLY64-NEXT:#define __CHAR16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY64-NEXT:#define __CHAR32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __CHAR_BIT__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __CONSTANT_CFSTRINGS__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_DECIMAL_DIG__ 17{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_DIG__ 15{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_EPSILON__ 2.2204460492503131e-16{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MANT_DIG__ 53{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MAX_10_EXP__ 308{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MAX_EXP__ 1024{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MAX__ 1.7976931348623157e+308{{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MIN_10_EXP__ (-307){{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MIN_EXP__ (-1021){{$}}
+// WEBASSEMBLY64-NEXT:#define __DBL_MIN__ 2.2250738585072014e-308{{$}}
+// WEBASSEMBLY64-NEXT:#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__{{$}}
+// WEBASSEMBLY64-NOT:#define __ELF__
+// WEBASSEMBLY64-NEXT:#define __FINITE_MATH_ONLY__ 0{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_DECIMAL_DIG__ 9{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_DENORM_MIN__ 1.40129846e-45F{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_DIG__ 6{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_EPSILON__ 1.19209290e-7F{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_EVAL_METHOD__ 0{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MANT_DIG__ 24{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MAX_10_EXP__ 38{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MAX_EXP__ 128{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MAX__ 3.40282347e+38F{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MIN_10_EXP__ (-37){{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MIN_EXP__ (-125){{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_MIN__ 1.17549435e-38F{{$}}
+// WEBASSEMBLY64-NEXT:#define __FLT_RADIX__ 2{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_BOOL_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_CHAR_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_INT_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_LLONG_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_LONG_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_POINTER_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_SHORT_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GNUC_MINOR__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __GNUC_PATCHLEVEL__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __GNUC_STDC_INLINE__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __GNUC__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __GXX_ABI_VERSION 1002{{$}}
+// WEBASSEMBLY64-NEXT:#define __GXX_RTTI 1{{$}}
+// WEBASSEMBLY64-NOT:#define __ILP32__
+// WEBASSEMBLY64-NEXT:#define __INT16_C_SUFFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __INT16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT16_MAX__ 32767{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT16_TYPE__ short{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT32_C_SUFFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __INT32_FMTd__ "d"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT32_FMTi__ "i"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT32_TYPE__ int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT64_C_SUFFIX__ LL{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT64_FMTd__ "lld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT64_FMTi__ "lli"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT64_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT64_TYPE__ long long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT8_C_SUFFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __INT8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT8_MAX__ 127{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT8_TYPE__ signed char{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_C_SUFFIX__ LL{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_FMTd__ "lld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_FMTi__ "lli"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_TYPE__ long long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTMAX_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTPTR_FMTd__ "ld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTPTR_FMTi__ "li"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTPTR_MAX__ 9223372036854775807L{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTPTR_TYPE__ long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INTPTR_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST16_MAX__ 32767{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST16_TYPE__ short{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST32_FMTd__ "d"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST32_FMTi__ "i"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST32_TYPE__ int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST64_FMTd__ "ld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST64_FMTi__ "li"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST64_MAX__ 9223372036854775807L{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST64_TYPE__ long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST8_MAX__ 127{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_FAST8_TYPE__ signed char{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST16_FMTd__ "hd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST16_FMTi__ "hi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST16_MAX__ 32767{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST16_TYPE__ short{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST32_FMTd__ "d"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST32_FMTi__ "i"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST32_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST32_TYPE__ int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST64_FMTd__ "ld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST64_FMTi__ "li"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST64_MAX__ 9223372036854775807L{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST64_TYPE__ long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST8_FMTd__ "hhd"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST8_FMTi__ "hhi"{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST8_MAX__ 127{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_LEAST8_TYPE__ signed char{{$}}
+// WEBASSEMBLY64-NEXT:#define __INT_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_DECIMAL_DIG__ 17{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_DIG__ 15{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_EPSILON__ 2.2204460492503131e-16L{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_HAS_DENORM__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_HAS_INFINITY__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_HAS_QUIET_NAN__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MANT_DIG__ 53{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MAX_10_EXP__ 308{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MAX_EXP__ 1024{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MAX__ 1.7976931348623157e+308L{{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MIN_10_EXP__ (-307){{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MIN_EXP__ (-1021){{$}}
+// WEBASSEMBLY64-NEXT:#define __LDBL_MIN__ 2.2250738585072014e-308L{{$}}
+// WEBASSEMBLY64-NEXT:#define __LITTLE_ENDIAN__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __LONG_LONG_MAX__ 9223372036854775807LL{{$}}
+// WEBASSEMBLY64-NEXT:#define __LONG_MAX__ 9223372036854775807L{{$}}
+// WEBASSEMBLY64-NEXT:#define __LP64__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __NO_INLINE__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __ORDER_BIG_ENDIAN__ 4321{{$}}
+// WEBASSEMBLY64-NEXT:#define __ORDER_LITTLE_ENDIAN__ 1234{{$}}
+// WEBASSEMBLY64-NEXT:#define __ORDER_PDP_ENDIAN__ 3412{{$}}
+// WEBASSEMBLY64-NEXT:#define __POINTER_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __PRAGMA_REDEFINE_EXTNAME 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __PTRDIFF_FMTd__ "ld"{{$}}
+// WEBASSEMBLY64-NEXT:#define __PTRDIFF_FMTi__ "li"{{$}}
+// WEBASSEMBLY64-NEXT:#define __PTRDIFF_MAX__ 9223372036854775807L{{$}}
+// WEBASSEMBLY64-NEXT:#define __PTRDIFF_TYPE__ long int{{$}}
+// WEBASSEMBLY64-NEXT:#define __PTRDIFF_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NOT:#define __REGISTER_PREFIX__
+// WEBASSEMBLY64-NEXT:#define __SCHAR_MAX__ 127{{$}}
+// WEBASSEMBLY64-NEXT:#define __SHRT_MAX__ 32767{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIG_ATOMIC_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIG_ATOMIC_WIDTH__ 32{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_DOUBLE__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_FLOAT__ 4{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_INT128__ 16{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_INT__ 4{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_LONG_DOUBLE__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_LONG_LONG__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_LONG__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_POINTER__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_PTRDIFF_T__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_SHORT__ 2{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_SIZE_T__ 8{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_WCHAR_T__ 4{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZEOF_WINT_T__ 4{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_FMTX__ "lX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_FMTo__ "lo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_FMTu__ "lu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_FMTx__ "lx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_MAX__ 18446744073709551615UL{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __SIZE_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __STDC_HOSTED__ 0{{$}}
+// WEBASSEMBLY64-NEXT:#define __STDC_UTF_16__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __STDC_UTF_32__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __STDC_VERSION__ 201112L{{$}}
+// WEBASSEMBLY64-NEXT:#define __STDC__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_C_SUFFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_MAX__ 65535{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_C_SUFFIX__ U{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_FMTX__ "X"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_FMTo__ "o"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_FMTu__ "u"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_FMTx__ "x"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_C_SUFFIX__ ULL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_FMTX__ "llX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_FMTo__ "llo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_FMTu__ "llu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_FMTx__ "llx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT64_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_C_SUFFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_MAX__ 255{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_C_SUFFIX__ ULL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_FMTX__ "llX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_FMTo__ "llo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_FMTu__ "llu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_FMTx__ "llx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_MAX__ 18446744073709551615ULL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_TYPE__ long long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTMAX_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_FMTX__ "lX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_FMTo__ "lo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_FMTu__ "lu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_FMTx__ "lx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_MAX__ 18446744073709551615UL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINTPTR_WIDTH__ 64{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_MAX__ 65535{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_FMTX__ "X"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_FMTo__ "o"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_FMTu__ "u"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_FMTx__ "x"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_FMTX__ "lX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_FMTo__ "lo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_FMTu__ "lu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_FMTx__ "lx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_MAX__ 18446744073709551615UL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST64_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_MAX__ 255{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_FAST8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_FMTX__ "hX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_FMTo__ "ho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_FMTu__ "hu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_FMTx__ "hx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_MAX__ 65535{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST16_TYPE__ unsigned short{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_FMTX__ "X"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_FMTo__ "o"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_FMTu__ "u"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_FMTx__ "x"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_MAX__ 4294967295U{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST32_TYPE__ unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_FMTX__ "lX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_FMTo__ "lo"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_FMTu__ "lu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_FMTx__ "lx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_MAX__ 18446744073709551615UL{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST64_TYPE__ long unsigned int{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_FMTX__ "hhX"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_FMTo__ "hho"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_FMTu__ "hhu"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_FMTx__ "hhx"{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_MAX__ 255{{$}}
+// WEBASSEMBLY64-NEXT:#define __UINT_LEAST8_TYPE__ unsigned char{{$}}
+// WEBASSEMBLY64-NEXT:#define __USER_LABEL_PREFIX__ {{$}}
+// WEBASSEMBLY64-NEXT:#define __VERSION__ "{{.*}}"{{$}}
+// WEBASSEMBLY64-NEXT:#define __WCHAR_MAX__ 2147483647{{$}}
+// WEBASSEMBLY64-NEXT:#define __WCHAR_TYPE__ int{{$}}
+// WEBASSEMBLY64-NOT:#define __WCHAR_UNSIGNED__
+// WEBASSEMBLY64-NEXT:#define __WCHAR_WIDTH__ 32{{$}}
+// WEBASSEMBLY64-NEXT:#define __WINT_TYPE__ int{{$}}
+// WEBASSEMBLY64-NOT:#define __WINT_UNSIGNED__
+// WEBASSEMBLY64-NEXT:#define __WINT_WIDTH__ 32{{$}}
+// WEBASSEMBLY64-NEXT:#define __clang__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __clang_major__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __clang_minor__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __clang_patchlevel__ {{.}}
+// WEBASSEMBLY64-NEXT:#define __clang_version__ "{{.*}}"{{$}}
+// WEBASSEMBLY64-NEXT:#define __llvm__ 1{{$}}
+// WEBASSEMBLY64-NOT:#define __wasm_simd128__
+// WEBASSEMBLY64-NOT:#define __wasm_simd256__
+// WEBASSEMBLY64-NOT:#define __wasm_simd512__
+// WEBASSEMBLY64-NOT:#define __unix
+// WEBASSEMBLY64-NOT:#define __unix__
+// WEBASSEMBLY64-NEXT:#define __wasm 1{{$}}
+// WEBASSEMBLY64-NOT:#define __wasm32
+// WEBASSEMBLY64-NOT:#define __wasm32__
+// WEBASSEMBLY64-NEXT:#define __wasm64 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __wasm64__ 1{{$}}
+// WEBASSEMBLY64-NEXT:#define __wasm__ 1{{$}}

test/Preprocessor/wasm-target-features.c

+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm32-unknown-unknown -msimd128 \
+// RUN:   | FileCheck %s -check-prefix=SIMD128
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm64-unknown-unknown -msimd128 \
+// RUN:   | FileCheck %s -check-prefix=SIMD128
+//
+// SIMD128:#define __wasm_simd128__ 1{{$}}
+//
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm32-unknown-unknown -mcpu=mvp \
+// RUN:   | FileCheck %s -check-prefix=MVP
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm64-unknown-unknown -mcpu=mvp \
+// RUN:   | FileCheck %s -check-prefix=MVP
+//
+// MVP-NOT:#define __wasm_simd128__
+//
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm32-unknown-unknown -mcpu=bleeding-edge \
+// RUN:   | FileCheck %s -check-prefix=BLEEDING_EDGE
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm64-unknown-unknown -mcpu=bleeding-edge \
+// RUN:   | FileCheck %s -check-prefix=BLEEDING_EDGE
+//
+// BLEEDING_EDGE:#define __wasm_simd128__ 1{{$}}
+//
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm32-unknown-unknown -mcpu=bleeding-edge -mno-simd128 \
+// RUN:   | FileCheck %s -check-prefix=BLEEDING_EDGE_NO_SIMD128
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm64-unknown-unknown -mcpu=bleeding-edge -mno-simd128 \
+// RUN:   | FileCheck %s -check-prefix=BLEEDING_EDGE_NO_SIMD128
+//
+// BLEEDING_EDGE_NO_SIMD128-NOT:#define __wasm_simd128__