[AArch64][Driver][SVE] Allow -msve-vector-bits=<n>+ syntax to mean no maximum vscale

[bsmith]

Summary

This patch splits the existing SveVectorBits LangOpt into VScaleMin and
VScaleMax LangOpts such that we can represent such an option. The cc1
option has also been split into -mvscale-{min,max}=<n> options so that the
cc1 arguments better reflect the vscale_range IR attribute.

[paulwalker-arm]

Are the references to "128-bit chunks" for the vscale flags necessary? That's really a nuisance of SVE that LLVM IR should not need to worry about. Can we speak exclusively in terms of vscale or is the "multiples of 128" required somewhere? Perhaps we're missing a target specific convert function from vscale+elt to bytes or something. Also there's nothing stoping vscale from being 3 (essentially any positive number) but you look to be restricting it to a power of two.

[bsmith]

In D111790#3063698, @paulwalker-arm wrote:

Are the references to "128-bit chunks" for the vscale flags necessary? That's really a nuisance of SVE that LLVM IR should not need to worry about. Can we speak exclusively in terms of vscale or is the "multiples of 128" required somewhere? Perhaps we're missing a target specific convert function from vscale+elt to bytes or something. Also there's nothing stoping vscale from being 3 (essentially any positive number) but you look to be restricting it to a power of two.

It does feel like we should have something somewhere that specifies the vscale chunk as I've had to hardcode 128 in a lot of places (thought they are SVE specific places, so I'll remove mention of it from the helptext). As for vscale values allowed, if we don't validate the values used in the option itself, where would we do it? I guess we could just blindly propagate the value down to the IR attribute and let the backends figure out what they want. The issue then is providing a nice error, though perhaps we don't need one given they are cc1 options?

[bsmith]

• Remove mention of 128-bit chunks from help texts
• Allow any positive integer value for -mvscale-{min,max}, not just powers of 2

[paulwalker-arm]

clang/lib/Sema/SemaType.cpp

7893

This should be VScaleMax as the attribute is only valid when -msve-vector-bits= is given only a number (i.e. -msve-vector-bits=128+ does not enable the fixed length ACLE extension).

I guess we need tests to cover this scenario.

7916

I'm thinking there should be a check for S.getLangOpts().VScaleMin == S.getLangOpts().VScaleMax somewhere, but I guess the current diagnostic probably doesn't account for two values, nor should it really. What about just duplicating this block but using VScaleMax in place of VScaleMin?

[bsmith]

clang/lib/Sema/SemaType.cpp

7916

I think I would rather have a separate check for min == max, and output a diagnostic stating that an exact -msve-vector-bits value must be used, does that sound sensible?

This could then perhaps be combined with the previous comment to produce sensible output, i.e.:

!vscale_min -> not supported
vscale_min != vscale_max -> must be fixed value

[bsmith]

clang/lib/Sema/SemaType.cpp

7916

Actually, now that I re-read the error message, and the fact that is directly refers to the valid values, I think instead there should just be an initial check of min == 0 || min != max.

[bsmith]

• Update sema checking for sve_vector_bits attribute to emit an error when the vscale min != max, i.e. when -mvse-vector-bits=<n>+ is used
• Add test to cover the above case

[Matt]

clang/lib/Driver/ToolChains/Clang.cpp

1832

There may be a way to avoid side-effects in assertions (getAsInteger changing the value of Bits passed by reference) similarly to the NewToSet example in https://llvm.org/docs/CodingStandards.html#assert-liberally, similarly to https://github.com/llvm/llvm-project/blob/release/13.x/llvm/include/llvm/TableGen/Record.h#L1980-L1983 or https://github.com/llvm/llvm-project/blob/release/13.x/clang/lib/StaticAnalyzer/Core/AnalyzerOptions.cpp#L181-L185.

[bsmith]

• Avoid side-effects in assertions

[peterwaller-arm]

(Accept, but please run clang format)

[paulwalker-arm]

clang/lib/Basic/Targets/AArch64.cpp

454–455

Similar to my previous comment these must only be defined when both Opts.VScaleMin and Opts.VScaleMax have the same non-zero value.

467–469

Should this be LangOpts.VScaleMin || LangOpts.VScaleMax to be more future proof?

clang/lib/Driver/ToolChains/Clang.cpp

1828

I looks like this should be unsigned to ensure the correct version of getAsInteger is called.

1829–1833

I'm wondering if with the extra complexity if it's worth parsing Val first before dealing with the numerical values. For example:

if (!Val.equals("scalable")) {
  if (Val.endswith("+")) {
    MinOnly = true;
    Val = Val.substr(0, Val.size() - 1);
  }

  if (Val.getAsInteger(10, Bits) &&
      (Bits == 128 || (Bits == 256...)) {
    Args.MakeArgString("-mvscale-min=", Bits)
    if (!MinOnly)
      Args.MakeArgString("-mvscale-max=", Bits)
  } else
    D.Diag(diag::err_drv_unsupported_option_argument
}

After writing this I'm not sure it's actually any better, so just something to consider.

[bsmith]

• Don't define SVE target bits macros when vscale min != max
• Add tests for above change
• Use correct (unsigned) version of getAsInteger

clang/include/clang/Basic/LangOptions.def

ENUM_LANGOPT(SignReturnAddressKey, SignReturnAddressKeyKind, 1, SignReturnAddressKeyKind::AKey,
              "Key used for return address signing")
 LANGOPT(BranchTargetEnforcement, 1, 0, "Branch-target enforcement enabled")
 
 LANGOPT(SpeculativeLoadHardening, 1, 0, "Speculative load hardening enabled")
 
 LANGOPT(RelativeCXXABIVTables, 1, 0,
         "Use an ABI-incompatible v-table layout that uses relative references")
 
-LANGOPT(ArmSveVectorBits, 32, 0, "SVE vector size in bits")
+LANGOPT(VScaleMin, 32, 0, "VScale minimum in 128-bit chunks")
+LANGOPT(VScaleMax, 32, 0, "VScale maximum in 128-bit chunks")
 
 ENUM_LANGOPT(ExtendIntArgs, ExtendArgsKind, 1, ExtendArgsKind::ExtendTo32,
              "Controls how scalar integer arguments are extended in calls "
              "to unprototyped and varargs functions")
 
 VALUE_LANGOPT(FuchsiaAPILevel, 32, 0, "Fuchsia API level")
 
 #undef LANGOPT
 #undef COMPATIBLE_LANGOPT
 #undef BENIGN_LANGOPT
 #undef ENUM_LANGOPT
 #undef COMPATIBLE_ENUM_LANGOPT
 #undef BENIGN_ENUM_LANGOPT
 #undef VALUE_LANGOPT
 #undef COMPATIBLE_VALUE_LANGOPT
 #undef BENIGN_VALUE_LANGOPT

clang/include/clang/Driver/Options.td

 foreach i = {1-31} in
   def ffixed_x#i : Flag<["-"], "ffixed-x"#i>, Group<m_Group>,
     HelpText<"Reserve the x"#i#" register (AArch64/RISC-V only)">;
 
 foreach i = {8-15,18} in
   def fcall_saved_x#i : Flag<["-"], "fcall-saved-x"#i>, Group<m_aarch64_Features_Group>,
     HelpText<"Make the x"#i#" register call-saved (AArch64 only)">;
 
-def msve_vector_bits_EQ : Joined<["-"], "msve-vector-bits=">,
-  Group<m_aarch64_Features_Group>, Flags<[NoXarchOption,CC1Option]>,
+def msve_vector_bits_EQ : Joined<["-"], "msve-vector-bits=">, Group<m_aarch64_Features_Group>,
   HelpText<"Specify the size in bits of an SVE vector register. Defaults to the"
-           " vector length agnostic value of \"scalable\". (AArch64 only)">,
-  Values<"128,256,512,1024,2048,scalable">,
-  NormalizedValues<["128", "256", "512", "1024", "2048", "0"]>,
-  MarshallingInfoEnum<LangOpts<"ArmSveVectorBits">, "0">;
+           " vector length agnostic value of \"scalable\". (AArch64 only)">;
+
+def mvscale_min_EQ : Joined<["-"], "mvscale-min=">,
+  Group<m_aarch64_Features_Group>, Flags<[NoXarchOption,CC1Option]>,
+  HelpText<"Specify the vscale minimum in 128-bit chunks. Defaults to the"
+           " vector length agnostic value of \"0\". (AArch64 only)">,
+  Values<"0,1,2,4,8,16">,
+  NormalizedValues<["0", "1", "2", "4", "8", "16"]>,
+  MarshallingInfoEnum<LangOpts<"VScaleMin">, "0">;
+def mvscale_max_EQ : Joined<["-"], "mvscale-max=">,
+  Group<m_aarch64_Features_Group>, Flags<[NoXarchOption,CC1Option]>,
+  HelpText<"Specify the vscale maximum in 128-bit chunks. Defaults to the"
+           " vector length agnostic value of \"0\". (AArch64 only)">,
+  Values<"0,1,2,4,8,16">,
+  NormalizedValues<["0", "1", "2", "4", "8", "16"]>,
+  MarshallingInfoEnum<LangOpts<"VScaleMax">, "0">;
 
 def msign_return_address_EQ : Joined<["-"], "msign-return-address=">,
   Flags<[CC1Option]>, Group<m_Group>, Values<"none,all,non-leaf">,
   HelpText<"Select return address signing scope">;
 def mbranch_protection_EQ : Joined<["-"], "mbranch-protection=">,
   HelpText<"Enforce targets of indirect branches and function returns">;
 
 def mharden_sls_EQ : Joined<["-"], "mharden-sls=">,

clang/lib/AST/ASTContext.cpp

bool ASTContext::areCompatibleVectorTypes(QualType FirstVec,
 
   return false;
 }
 
 /// getSVETypeSize - Return SVE vector or predicate register size.
 static uint64_t getSVETypeSize(ASTContext &Context, const BuiltinType *Ty) {
   assert(Ty->isVLSTBuiltinType() && "Invalid SVE Type");
   return Ty->getKind() == BuiltinType::SveBool
-             ? Context.getLangOpts().ArmSveVectorBits / Context.getCharWidth()
-             : Context.getLangOpts().ArmSveVectorBits;
+             ? (Context.getLangOpts().VScaleMin * 128) / Context.getCharWidth()
+             : Context.getLangOpts().VScaleMin * 128;
 }
 
 bool ASTContext::areCompatibleSveTypes(QualType FirstType,
                                        QualType SecondType) {
   assert(((FirstType->isSizelessBuiltinType() && SecondType->isVectorType()) ||
           (FirstType->isVectorType() && SecondType->isSizelessBuiltinType())) &&
          "Expected SVE builtin type and vector type!");
 

clang/lib/Basic/Targets/AArch64.cpp

void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
   }
 
   // All of the __sync_(bool|val)_compare_and_swap_(1|2|4|8) builtins work.
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
 
-  if (Opts.ArmSveVectorBits) {
-    Builder.defineMacro("__ARM_FEATURE_SVE_BITS", Twine(Opts.ArmSveVectorBits));
+  if (Opts.VScaleMin) {
+    Builder.defineMacro("__ARM_FEATURE_SVE_BITS", Twine(Opts.VScaleMin * 128));
     Builder.defineMacro("__ARM_FEATURE_SVE_VECTOR_OPERATORS");
   }
 }
 
 ArrayRef<Builtin::Info> AArch64TargetInfo::getTargetBuiltins() const {
   return llvm::makeArrayRef(BuiltinInfo, clang::AArch64::LastTSBuiltin -
                                              Builtin::FirstTSBuiltin);
 }
 
 Optional<std::pair<unsigned, unsigned>>
 AArch64TargetInfo::getVScaleRange(const LangOptions &LangOpts) const {
-  if (LangOpts.ArmSveVectorBits) {
-    unsigned VScale = LangOpts.ArmSveVectorBits / 128;
-    return std::pair<unsigned, unsigned>(VScale, VScale);
-  }
+  if (LangOpts.VScaleMin)
+    return std::pair<unsigned, unsigned>(LangOpts.VScaleMin,
+                                         LangOpts.VScaleMax);
   if (hasFeature("sve"))
     return std::pair<unsigned, unsigned>(0, 16);
   return None;
 }
 
 bool AArch64TargetInfo::hasFeature(StringRef Feature) const {
   return Feature == "aarch64" || Feature == "arm64" || Feature == "arm" ||
          (Feature == "neon" && (FPU & NeonMode)) ||

clang/lib/Driver/ToolChains/Clang.cpp

if (IndirectBranches)
       CmdArgs.push_back("-mbranch-target-enforce");
   }
 
   // Handle -msve_vector_bits=<bits>
   if (Arg *A = Args.getLastArg(options::OPT_msve_vector_bits_EQ)) {
     StringRef Val = A->getValue();
     const Driver &D = getToolChain().getDriver();
     if (Val.equals("128") || Val.equals("256") || Val.equals("512") ||
-        Val.equals("1024") || Val.equals("2048"))
+        Val.equals("1024") || Val.equals("2048") || Val.equals("128+") ||
+        Val.equals("256+") || Val.equals("512+") || Val.equals("1024+") ||
+        Val.equals("2048+")) {
+      int Bits = 0;
+      if (Val.endswith("+"))
+        Val = Val.substr(0, Val.size() - 1);
+      else {
+        assert(!Val.getAsInteger(10, Bits));
+        CmdArgs.push_back(
+            Args.MakeArgString("-mvscale-max=" + llvm::Twine(Bits / 128)));
+      }
+
+      assert(!Val.getAsInteger(10, Bits));
       CmdArgs.push_back(
-          Args.MakeArgString(llvm::Twine("-msve-vector-bits=") + Val));
+          Args.MakeArgString("-mvscale-min=" + llvm::Twine(Bits / 128)));
     // Silently drop requests for vector-length agnostic code as it's implied.
-    else if (!Val.equals("scalable"))
+    } else if (!Val.equals("scalable"))
       // Handle the unsupported values passed to msve-vector-bits.
       D.Diag(diag::err_drv_unsupported_option_argument)
           << A->getOption().getName() << Val;
   }
 
   AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
 }
 

clang/lib/Sema/SemaType.cpp

static void HandleArmSveVectorBitsTypeAttr(QualType &CurType, ParsedAttr &Attr,
   // Target must have SVE.
   if (!S.Context.getTargetInfo().hasFeature("sve")) {
     S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr << "'sve'";
     Attr.setInvalid();
     return;
   }
 
   // Attribute is unsupported if '-msve-vector-bits=<bits>' isn't specified.
-  if (!S.getLangOpts().ArmSveVectorBits) {
+  if (!S.getLangOpts().VScaleMin) {
     S.Diag(Attr.getLoc(), diag::err_attribute_arm_feature_sve_bits_unsupported)
         << Attr;
     Attr.setInvalid();
     return;
   }
 
   // Check the attribute arguments.
   if (Attr.getNumArgs() != 1) {
     S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
         << Attr << 1;
     Attr.setInvalid();
     return;
   }
 
   // The vector size must be an integer constant expression.
   llvm::APSInt SveVectorSizeInBits(32);
   if (!verifyValidIntegerConstantExpr(S, Attr, SveVectorSizeInBits))
     return;
 
   unsigned VecSize = static_cast<unsigned>(SveVectorSizeInBits.getZExtValue());
 
   // The attribute vector size must match -msve-vector-bits.
-  if (VecSize != S.getLangOpts().ArmSveVectorBits) {
+  if (VecSize != S.getLangOpts().VScaleMin * 128) {
     S.Diag(Attr.getLoc(), diag::err_attribute_bad_sve_vector_size)
-        << VecSize << S.getLangOpts().ArmSveVectorBits;
+        << VecSize << S.getLangOpts().VScaleMin * 128;
     Attr.setInvalid();
     return;
   }
 
   // Attribute can only be attached to a single SVE vector or predicate type.
   if (!CurType->isVLSTBuiltinType()) {
     S.Diag(Attr.getLoc(), diag::err_attribute_invalid_sve_type)
         << Attr << CurType;

clang/test/CodeGen/aarch64-sve-acle-__ARM_FEATURE_SVE_VECTOR_OPERATORS.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=128  | FileCheck %s -D#VBITS=128  --check-prefixes=CHECK128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=256  | FileCheck %s -D#VBITS=256  --check-prefixes=CHECK,CHECK256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=512  | FileCheck %s -D#VBITS=512  --check-prefixes=CHECK,CHECK512
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=1024 | FileCheck %s -D#VBITS=1024 --check-prefixes=CHECK,CHECK1024
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=2048 | FileCheck %s -D#VBITS=2048 --check-prefixes=CHECK,CHECK2048
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=1 -mvscale-max=1  | FileCheck %s -D#VBITS=128  --check-prefixes=CHECK128
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=2 -mvscale-max=2  | FileCheck %s -D#VBITS=256  --check-prefixes=CHECK,CHECK256
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=4 -mvscale-max=4  | FileCheck %s -D#VBITS=512  --check-prefixes=CHECK,CHECK512
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=8 -mvscale-max=8 | FileCheck %s -D#VBITS=1024 --check-prefixes=CHECK,CHECK1024
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=16 -mvscale-max=16 | FileCheck %s -D#VBITS=2048 --check-prefixes=CHECK,CHECK2048
 // REQUIRES: aarch64-registered-target
 
 // Examples taken from section "3.7.3.3 Behavior specific to SVE
 // vectors" of the SVE ACLE (Version 00bet6) that can be found at
 // https://developer.arm.com/documentation/100987/latest
 //
 // Example has been expanded to work with mutiple values of
-// -msve-vector-bits.
+// -mvscale-{min,max}.
 
 #include <arm_sve.h>
 
 // Page 27, item 1
 #if __ARM_FEATURE_SVE_BITS == 256 && __ARM_FEATURE_SVE_VECTOR_OPERATORS
 // CHECK256-LABEL: @x256 ={{.*}} local_unnamed_addr global <4 x i64> <i64 0, i64 1, i64 2, i64 3>, align 16
 typedef svint64_t vec256 __attribute__((arm_sve_vector_bits(256)));
 vec256 x256 = {0, 1, 2, 3};

clang/test/CodeGen/aarch64-sve-acle-__ARM_FEATURE_SVE_VECTOR_OPERATORS.cpp

-// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=128  | FileCheck %s -D#VBITS=128  --check-prefixes=CHECK,CHECK128
-// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=256  | FileCheck %s -D#VBITS=256  --check-prefixes=CHECK,CHECKWIDE
-// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=512  | FileCheck %s -D#VBITS=512  --check-prefixes=CHECK,CHECKWIDE
-// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=1024 | FileCheck %s -D#VBITS=1024 --check-prefixes=CHECK,CHECKWIDE
-// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -msve-vector-bits=2048 | FileCheck %s -D#VBITS=2048 --check-prefixes=CHECK,CHECKWIDE
+// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=1 -mvscale-max=1  | FileCheck %s -D#VBITS=128  --check-prefixes=CHECK,CHECK128
+// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=2 -mvscale-max=2  | FileCheck %s -D#VBITS=256  --check-prefixes=CHECK,CHECKWIDE
+// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=4 -mvscale-max=4  | FileCheck %s -D#VBITS=512  --check-prefixes=CHECK,CHECKWIDE
+// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=8 -mvscale-max=8 | FileCheck %s -D#VBITS=1024 --check-prefixes=CHECK,CHECKWIDE
+// RUN: %clang_cc1 -x c++ -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -S -O1 -Werror -Wall -emit-llvm -o - %s -mvscale-min=16 -mvscale-max=16 | FileCheck %s -D#VBITS=2048 --check-prefixes=CHECK,CHECKWIDE
 // REQUIRES: aarch64-registered-target
 
 // Examples taken from section "3.7.3.3 Behavior specific to SVE
 // vectors" of the SVE ACLE (Version 00bet6) that can be found at
 // https://developer.arm.com/documentation/100987/latest
 //
 // Example has been expanded to work with mutiple values of
-// -msve-vector-bits.
+// -mvscale-{min,max}.
 
 #include <arm_sve.h>
 
 // Page 26, first paragraph of 3.7.3.3: sizeof and alignof
 #if __ARM_FEATURE_SVE_BITS
 #define N __ARM_FEATURE_SVE_BITS
 typedef svfloat32_t fixed_svfloat __attribute__((arm_sve_vector_bits(N)));
 void test01() {

clang/test/CodeGen/aarch64-sve-vector-bits-codegen.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -msve-vector-bits=256  | FileCheck %s --check-prefixes=CHECK,CHECK256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -msve-vector-bits=512  | FileCheck %s --check-prefixes=CHECK,CHECK512
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -msve-vector-bits=1024 | FileCheck %s --check-prefixes=CHECK,CHECK1024
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -msve-vector-bits=2048 | FileCheck %s --check-prefixes=CHECK,CHECK2048
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -mvscale-min=2 -mvscale-max=2  | FileCheck %s --check-prefixes=CHECK,CHECK256
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -mvscale-min=4 -mvscale-max=4  | FileCheck %s --check-prefixes=CHECK,CHECK512
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -mvscale-min=8 -mvscale-max=8 | FileCheck %s --check-prefixes=CHECK,CHECK1024
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -fallow-half-arguments-and-returns -O2 -S -o - %s -mvscale-min=16 -mvscale-max=16 | FileCheck %s --check-prefixes=CHECK,CHECK2048
 // REQUIRES: aarch64-registered-target
 
 #include <arm_sve.h>
 
 void func(int *restrict a, int *restrict b) {
 // CHECK-LABEL: func
 // CHECK256-COUNT-8: st1w
 // CHECK512-COUNT-4: st1w
 // CHECK1024-COUNT-2: st1w
 // CHECK2048-COUNT-1: st1w
 #pragma clang loop vectorize(enable)
   for (int i = 0; i < 64; ++i)
     a[i] += b[i];
 }

clang/test/CodeGen/arm-sve-vector-bits-vscale-range.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=128 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=256 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=512
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=1024 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=1024
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=2048 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=2048
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -msve-vector-bits=128 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -msve-vector-bits=256 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -msve-vector-bits=scalable -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=scalable -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=1 -mvscale-max=1 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=1
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=2 -mvscale-max=2 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=2
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=4
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=8 -mvscale-max=8 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=8
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=16 -mvscale-max=16 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=16
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -mvscale-min=1 -mvscale-max=1 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=1
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -mvscale-min=2 -mvscale-max=2 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=2
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=1 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=1 --check-prefix=CHECK-NOMAX
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=2 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=2 --check-prefix=CHECK-NOMAX
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=4 --check-prefix=CHECK-NOMAX
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=8 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=8 --check-prefix=CHECK-NOMAX
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=16 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=16 --check-prefix=CHECK-NOMAX
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve2 -mvscale-min=0 -mvscale-max=0 -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=0 -mvscale-max=0 -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
 
 // CHECK-LABEL: @func() #0
-// CHECK: attributes #0 = { {{.*}} vscale_range([[#div(VBITS,128)]],[[#div(VBITS,128)]]) {{.*}} }
+// CHECK: attributes #0 = { {{.*}} vscale_range([[#VBITS]],[[#VBITS]]) {{.*}} }
+// CHECK-NOMAX: attributes #0 = { {{.*}} vscale_range([[#VBITS]],0) {{.*}} }
 // CHECK-NONE: attributes #0 = { {{.*}} vscale_range(0,16) {{.*}} }
 void func() {}

clang/test/CodeGen/attr-arm-sve-vector-bits-bitcast.c

 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
 // REQUIRES: aarch64-registered-target
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=128 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=256 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-512
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=1 -mvscale-max=1 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-128
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=2 -mvscale-max=2 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-256
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-512
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint64_t fixed_int64_t __attribute__((arm_sve_vector_bits(N)));
 typedef svfloat64_t fixed_float64_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbfloat16_t fixed_bfloat16_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGen/attr-arm-sve-vector-bits-call.c

 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
 // REQUIRES: aarch64-registered-target
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -fallow-half-arguments-and-returns -fno-experimental-new-pass-manager -S -O1 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -fno-experimental-new-pass-manager -S -O1 -emit-llvm -o - %s | FileCheck %s
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint32_t fixed_int32_t __attribute__((arm_sve_vector_bits(N)));
 typedef svfloat64_t fixed_float64_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbool_t fixed_bool_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGen/attr-arm-sve-vector-bits-cast.c

 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
 // REQUIRES: aarch64-registered-target
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s | FileCheck %s
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint32_t fixed_int32_t __attribute__((arm_sve_vector_bits(N)));
 typedef svfloat64_t fixed_float64_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbool_t fixed_bool_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGen/attr-arm-sve-vector-bits-codegen.c

 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint32_t fixed_int32_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbool_t fixed_bool_t __attribute__((arm_sve_vector_bits(N)));
 typedef uint8_t uint8_vec_t __attribute__((vector_size(N / 64)));

clang/test/CodeGen/attr-arm-sve-vector-bits-globals.c

 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
 // REQUIRES: aarch64-registered-target
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=128 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s -fhalf-no-semantic-interposition | FileCheck %s --check-prefix=CHECK-128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s -fhalf-no-semantic-interposition | FileCheck %s --check-prefix=CHECK-512
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=1 -mvscale-max=1 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s -fhalf-no-semantic-interposition | FileCheck %s --check-prefix=CHECK-128
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -O1 -emit-llvm -o - %s -fhalf-no-semantic-interposition | FileCheck %s --check-prefix=CHECK-512
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint64_t fixed_int64_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbfloat16_t fixed_bfloat16_t __attribute__((arm_sve_vector_bits(N)));
 typedef svbool_t fixed_bool_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGen/attr-arm-sve-vector-bits-types.c

 // REQUIRES: aarch64-registered-target
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=128 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-128
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=256 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-256
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-512
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=1024 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-1024
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -msve-vector-bits=2048 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-2048
-// RUN: %clang_cc1 -triple aarch64_32-unknown-darwin -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ILP32
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=1 -mvscale-max=1 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-128
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=2 -mvscale-max=2 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-256
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-512
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=8 -mvscale-max=8 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-1024
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -mvscale-min=16 -mvscale-max=16 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-2048
+// RUN: %clang_cc1 -triple aarch64_32-unknown-darwin -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ILP32
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef svint8_t fixed_int8_t __attribute__((arm_sve_vector_bits(N)));
 typedef svint16_t fixed_int16_t __attribute__((arm_sve_vector_bits(N)));
 typedef svint32_t fixed_int32_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGenCXX/aarch64-mangle-sve-fixed-vectors.cpp

 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=128 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=1 -mvscale-max=1 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-128
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=256 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=2 -mvscale-max=2 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-256
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-512
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=1024 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=8 -mvscale-max=8 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-1024
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=2048 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=16 -mvscale-max=16 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-2048
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef __SVInt8_t fixed_int8_t __attribute__((arm_sve_vector_bits(N)));
 typedef __SVInt16_t fixed_int16_t __attribute__((arm_sve_vector_bits(N)));
 typedef __SVInt32_t fixed_int32_t __attribute__((arm_sve_vector_bits(N)));
 typedef __SVInt64_t fixed_int64_t __attribute__((arm_sve_vector_bits(N)));

clang/test/CodeGenCXX/aarch64-sve-fixedtypeinfo.cpp

 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=128 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=1 -mvscale-max=1 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-128
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=256 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=2 -mvscale-max=2 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-256
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=512 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=4 -mvscale-max=4 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-512
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=1024 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=8 -mvscale-max=8 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-1024
 // RUN: %clang_cc1 -triple aarch64-none-linux-gnu %s -emit-llvm -o - \
-// RUN:  -target-feature +sve -target-feature +bf16 -msve-vector-bits=2048 \
+// RUN:  -target-feature +sve -target-feature +bf16 -mvscale-min=16 -mvscale-max=16 \
 // RUN:  | FileCheck %s --check-prefix=CHECK-2048
 
 #define N __ARM_FEATURE_SVE_BITS
 
 namespace std {
 class type_info;
 };
 

clang/test/Driver/aarch64-sve-vector-bits.c

 // -----------------------------------------------------------------------------
 // Tests for the -msve-vector-bits flag
 // -----------------------------------------------------------------------------
 
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=128 2>&1 | FileCheck --check-prefix=CHECK-128 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=256 2>&1 | FileCheck --check-prefix=CHECK-256 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=512 2>&1 | FileCheck --check-prefix=CHECK-512 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=1024 2>&1 | FileCheck --check-prefix=CHECK-1024 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=2048 2>&1 | FileCheck --check-prefix=CHECK-2048 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=128+ 2>&1 | FileCheck --check-prefix=CHECK-128P %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=256+ 2>&1 | FileCheck --check-prefix=CHECK-256P %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=512+ 2>&1 | FileCheck --check-prefix=CHECK-512P %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=1024+ 2>&1 | FileCheck --check-prefix=CHECK-1024P %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=2048+ 2>&1 | FileCheck --check-prefix=CHECK-2048P %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=scalable 2>&1 | FileCheck --check-prefix=CHECK-SCALABLE %s
 
-// CHECK-128: "-msve-vector-bits=128"
-// CHECK-256: "-msve-vector-bits=256"
-// CHECK-512: "-msve-vector-bits=512"
-// CHECK-1024: "-msve-vector-bits=1024"
-// CHECK-2048: "-msve-vector-bits=2048"
-// CHECK-SCALABLE-NOT: "-msve-vector-bits=
+// CHECK-128: "-mvscale-max=1" "-mvscale-min=1"
+// CHECK-256: "-mvscale-max=2" "-mvscale-min=2"
+// CHECK-512: "-mvscale-max=4" "-mvscale-min=4"
+// CHECK-1024: "-mvscale-max=8" "-mvscale-min=8"
+// CHECK-2048: "-mvscale-max=16" "-mvscale-min=16"
+
+// CHECK-128P: "-mvscale-min=1"
+// CHECK-128P-NOT: "-mvscale-max"
+// CHECK-256P: "-mvscale-min=2"
+// CHECK-256P-NOT: "-mvscale-max"
+// CHECK-512P: "-mvscale-min=4"
+// CHECK-512P-NOT: "-mvscale-max"
+// CHECK-1024P: "-mvscale-min=8"
+// CHECK-1024P-NOT: "-mvscale-max"
+// CHECK-2048P: "-mvscale-min=16"
+// CHECK-2048P-NOT: "-mvscale-max"
+// CHECK-SCALABLE-NOT: "-mvscale-min=
+// CHECK-SCALABLE-NOT: "-mvscale-max=
 
 // Error out if an unsupported value is passed to -msve-vector-bits.
 // -----------------------------------------------------------------------------
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=64 2>&1 | FileCheck --check-prefix=CHECK-BAD-VALUE-ERROR %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=A 2>&1 | FileCheck --check-prefix=CHECK-BAD-VALUE-ERROR %s
 

clang/test/Sema/aarch64-sve-explicit-casts-fixed-size.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=128 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=256 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=1024 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=2048 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=1 -mvscale-max=1 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=2 -mvscale-max=2 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=8 -mvscale-max=8 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=16 -mvscale-max=16 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
 
 // expected-no-diagnostics
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 #define FIXED_ATTR __attribute__((arm_sve_vector_bits(N)))
 

clang/test/Sema/aarch64-sve-lax-vector-conversions.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-none %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=integer -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-integer %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=all -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-all %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-none %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=integer -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-integer %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=all -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-all %s
 
 // lax-vector-all-no-diagnostics
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 #define SVE_FIXED_ATTR __attribute__((arm_sve_vector_bits(N)))
 #define GNU_FIXED_ATTR __attribute__((vector_size(N / 8)))

clang/test/Sema/attr-arm-sve-vector-bits.c

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -msve-vector-bits=128 -fallow-half-arguments-and-returns %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -msve-vector-bits=256 -fallow-half-arguments-and-returns %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -msve-vector-bits=512 -fallow-half-arguments-and-returns %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -msve-vector-bits=1024 -fallow-half-arguments-and-returns %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -msve-vector-bits=2048 -fallow-half-arguments-and-returns %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -mvscale-min=1 -mvscale-max=1 -fallow-half-arguments-and-returns %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -mvscale-min=2 -mvscale-max=2 -fallow-half-arguments-and-returns %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -mvscale-min=8 -mvscale-max=8 -fallow-half-arguments-and-returns %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -mvscale-min=16 -mvscale-max=16 -fallow-half-arguments-and-returns %s
 
 #include <stdint.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef __fp16 float16_t;
 typedef float float32_t;
 typedef double float64_t;

clang/test/SemaCXX/aarch64-sve-explicit-casts-fixed-size.cpp

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=128 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=256 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=1024 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=2048 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=1 -mvscale-max=1 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=2 -mvscale-max=2 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=8 -mvscale-max=8 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=16 -mvscale-max=16 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify %s
 
 // expected-no-diagnostics
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 #define FIXED_ATTR __attribute__((arm_sve_vector_bits(N)))
 

clang/test/SemaCXX/aarch64-sve-lax-vector-conversions.cpp

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-none %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=integer -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-integer %s
-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -msve-vector-bits=512 -flax-vector-conversions=all -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-all %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=none -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-none %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=integer -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-integer %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -mvscale-min=4 -mvscale-max=4 -flax-vector-conversions=all -fallow-half-arguments-and-returns -ffreestanding -fsyntax-only -verify=lax-vector-all %s
 
 #include <arm_sve.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 #define SVE_FIXED_ATTR __attribute__((arm_sve_vector_bits(N)))
 #define GNU_FIXED_ATTR __attribute__((vector_size(N / 8)))
 #define GNU_BOOL_FIXED_ATTR __attribute__((vector_size(N / 64)))
 

clang/test/SemaCXX/attr-arm-sve-vector-bits.cpp

-// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -std=c++11 -msve-vector-bits=512 -fallow-half-arguments-and-returns -Wconversion %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -std=c++11 -mvscale-min=4 -mvscale-max=4 -fallow-half-arguments-and-returns -Wconversion %s
 // expected-no-diagnostics
 
 #include <stdint.h>
 
 #define N __ARM_FEATURE_SVE_BITS
 
 typedef __SVInt8_t svint8_t;
 typedef svint8_t fixed_int8_t __attribute__((arm_sve_vector_bits(N)));