[Bitcode][Asm] Teach LLVM to read and write operand bundles.

[sanjoy]

Summary

This also adds the first set of tests for operand bundles.

The optimizer has not been audited to ensure that it does the right
thing with operand bundles.

Note:
This change adds a stub to LangRef, but documentation is still a TODO.
Given that this is a large change set, I figured it would be wise to get
this out for review and get some feedback earlier rather than later.
I'll update this patch with more comprehensive documentation soon.

Depends on D12456.

[JosephTremoulet]

lib/AsmParser/LLParser.cpp

1963

Why use a lambda here as opposed to just inlining it?

test/Bitcode/operand-bundles.ll

20

Do we really want two ways to represent that? I think reporting an error for [ ] would be appropriate.

[sanjoy]

lib/AsmParser/LLParser.cpp

1963

I started out thinking that the early returns would simplify the code, but after re-reading it I don't think they're helping at all. I'll inline the logic and get rid of the lambda.

test/Bitcode/operand-bundles.ll

20

Will fix.

[sanjoy]

Address review + more docs.

[JosephTremoulet]

Updates look good, thanks.

docs/LangRef.rst

1494

typo: should be 'Operand bundles are tagged sets...'

[sanjoy]

• fix doc (addressing @JosephTremoulet 's review)

[sanjoy]

• add some tests to compatibility.ll
  
  Note: these do not yet pass but as far as I can tell, the issue is unrelated to operand bundles -- see PR24755.

[sanjoy]

• address Duncan's review about bitcode reading and writing
  • use a prefixed list sequence of operand bundles that are consumed when parsing calls and invokes
  • use a common "bundle tag" area in a module, and refer to tags by their indices elsewhere

[sanjoy]

• address two other comments by Duncan:
  • always use 0 abbrev in WriteOperandBundles
  • hyphenation in the comment

[sanjoy]

• address Duncan's review w.r.t not duplicating code
• some more docs
• use ArrayRef<> correctly to avoid breakage when building with gcc

[JosephTremoulet]

docs/LangRef.rst

1486

typo: s/taken/take/

[sanjoy]

• fix typo pointed out by Joseph

[sanjoy]

Just to make it clear: this was LGTM'ed by Duncan via email (for some reason these emails did not show up here).

docs/LangRef.rst

``"thunk"``
     match the thunk target prototype.
 ``uwtable``
     This attribute indicates that the ABI being targeted requires that
     an unwind table entry be produced for this function even if we can
     show that no exceptions passes by it. This is normally the case for
     the ELF x86-64 abi, but it can be disabled for some compilation
     units.
 
+
+.. _opbundles:
+
+Operand Bundles
+---------------
+
+Note: operand bundles are a work in progress, and they should be
+considered experimental at this time.
+
+Operand bundles are tagged sets of SSA values that can be associated
+with certain LLVM instructions (currently only ``call``s and
+``invoke``s).  In a way they are like metadata, but dropping them is
+incorrect and will change program semantics.
+
+Syntax::
+    operand bundle set ::= '[' operand bundle ']'
+    operand bundle ::= tag '(' [ bundle operand ] (, bundle operand )* ')'
+    bundle operand ::= SSA value
+    tag ::= string constant
+
+Operand bundles are **not** part of a function's signature, and a
+given function may be called from multiple places with different kinds
+of operand bundles.  This reflects the fact that the operand bundles
+are conceptually a part of the ``call`` (or ``invoke``), not the
+callee being dispatched to.
+
+Operand bundles are a generic mechanism intended to support
+runtime-introspection-like functionality for managed languages.  While
+the exact semantics of an operand bundle depend on the bundle tag,
+there are certain limitations to how much the presence of an operand
+bundle can influence the semantics of a program.  These restrictions
+are described as the semantics of an "unknown" operand bundle.  As
+long as the behavior of an operand bundle is describable within these
+restrictions, LLVM does not need to have special knowledge of the
+operand bundle to not miscompile programs containing it.
+
+ - The bundle operands for an unknown operand bundle escape in unknown
+   ways before control is transferred to the callee or invokee.
+
+ - Calls and invokes with operand bundles have unknown read / write
+   effect on the heap on entry and exit (even if the call target is
+   ``readnone`` or ``readonly``).
+
+ - An operand bundle at a call site cannot change the implementation
+   of the called function.  Inter-procedural optimizations work as
+   usual as long as they take into account the first two properties.
+
 .. _moduleasm:
 
 Module-Level Inline Assembly
 ----------------------------
 
 Modules may contain "module-level inline asm" blocks, which corresponds
 to the GCC "file scope inline asm" blocks. These blocks are internally
 concatenated by LLVM and treated as a single unit, but may be separated
 in the ``.ll`` file if desired. The syntax is very simple:
 
 .. code-block:: llvm
 
     module asm "inline asm code goes here"
     module asm "more can go here"
 

 ^^^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 
 ::
 
       <result> = invoke [cconv] [ret attrs] <ptr to function ty> <function ptr val>(<function args>) [fn attrs]
-                    to label <normal label> unwind label <exception label>
+                    [operand bundles] to label <normal label> unwind label <exception label>
 
 Overview:
 """""""""
 
 The '``invoke``' instruction causes control to transfer to a specified
 function, with the possibility of control flow transfer to either the
 '``normal``' label or the '``exception``' label. If the callee function
 returns with the "``ret``" instruction, control flow will return to the

 #. '``normal label``': the label reached when the called function
    executes a '``ret``' instruction.
 #. '``exception label``': the label reached when a callee returns via
    the :ref:`resume <i_resume>` instruction or other exception handling
    mechanism.
 #. The optional :ref:`function attributes <fnattrs>` list. Only
    '``noreturn``', '``nounwind``', '``readonly``' and '``readnone``'
    attributes are valid here.
+#. The optional :ref:`operand bundles <opbundles>` list.
 
 Semantics:
 """"""""""
 
 This instruction is designed to operate as a standard '``call``'
 instruction in most regards. The primary difference is that it
 establishes an association with a label, which is used by the runtime
 library to unwind the stack.

 ^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 
 ::
 
       <result> = [tail | musttail] call [cconv] [ret attrs] <ty> [<fnty>*] <fnptrval>(<function args>) [fn attrs]
+                   [ operand bundles ]
 
 Overview:
 """""""""
 
 The '``call``' instruction represents a simple function call.
 
 Arguments:
 """"""""""

 #. '``function args``': argument list whose types match the function
    signature argument types and parameter attributes. All arguments must
    be of :ref:`first class <t_firstclass>` type. If the function signature
    indicates the function accepts a variable number of arguments, the
    extra arguments can be specified.
 #. The optional :ref:`function attributes <fnattrs>` list. Only
    '``noreturn``', '``nounwind``', '``readonly``' and '``readnone``'
    attributes are valid here.
+#. The optional :ref:`operand bundles <opbundles>` list.
 
 Semantics:
 """"""""""
 
 The '``call``' instruction is used to cause control flow to transfer to
 a specified function, with its incoming arguments bound to the specified
 values. Upon a '``ret``' instruction in the called function, control
 flow continues with the instruction after the function call, and the

include/llvm/Bitcode/LLVMBitCodes.h

enum BlockIDs {
     UNUSED_ID1,
 
     VALUE_SYMTAB_BLOCK_ID,
     METADATA_BLOCK_ID,
     METADATA_ATTACHMENT_ID,
 
     TYPE_BLOCK_ID_NEW,
 
-    USELIST_BLOCK_ID
+    USELIST_BLOCK_ID,
+
+    OPERAND_BUNDLE_TAGS_BLOCK_ID
   };
 
 
   /// MODULE blocks have a number of optional fields and subblocks.
   enum ModuleCodes {
     MODULE_CODE_VERSION     = 1,    // VERSION:     [version#]
     MODULE_CODE_TRIPLE      = 2,    // TRIPLE:      [strchr x N]
     MODULE_CODE_DATALAYOUT  = 3,    // DATALAYOUT:  [strchr x N]
enum TypeCodes {
     TYPE_CODE_STRUCT_NAME = 19, // STRUCT_NAME: [strchr x N]
     TYPE_CODE_STRUCT_NAMED = 20,// STRUCT_NAMED: [ispacked, eltty x N]
 
     TYPE_CODE_FUNCTION = 21,    // FUNCTION: [vararg, retty, paramty x N]
 
     TYPE_CODE_TOKEN = 22        // TOKEN
   };
 
+  enum OperandBundleTagCode {
+    OPERAND_BUNDLE_TAG = 1,     // TAG: [strchr x N]
+  };
+
   // The type symbol table only has one code (TST_ENTRY_CODE).
   enum TypeSymtabCodes {
     TST_CODE_ENTRY = 1     // TST_ENTRY: [typeid, namechar x N]
   };
 
   // The value symbol table only has one code (VST_ENTRY_CODE).
   enum ValueSymtabCodes {
     VST_CODE_ENTRY   = 1,  // VST_ENTRY: [valid, namechar x N]
enum FunctionCodes {
     FUNC_CODE_INST_LANDINGPAD  = 47, // LANDINGPAD: [ty,val,num,id0,val0...]
     FUNC_CODE_INST_CLEANUPRET  = 48, // CLEANUPRET: [val] or [val,bb#]
     FUNC_CODE_INST_CATCHRET    = 49, // CATCHRET: [val,bb#]
     FUNC_CODE_INST_CATCHPAD  = 50, // CATCHPAD: [bb#,bb#,num,args...]
     FUNC_CODE_INST_TERMINATEPAD = 51, // TERMINATEPAD: [bb#,num,args...]
     FUNC_CODE_INST_CLEANUPPAD = 52, // CLEANUPPAD: [num,args...]
     FUNC_CODE_INST_CATCHENDPAD = 53, // CATCHENDPAD: [] or [bb#]
     FUNC_CODE_INST_CLEANUPENDPAD = 54, // CLEANUPENDPAD: [val] or [val,bb#]
+
+    FUNC_CODE_OPERAND_BUNDLE = 55, // OPERAND_BUNDLE: [tag#, value...]
   };
 
   enum UseListCodes {
     USELIST_CODE_DEFAULT = 1, // DEFAULT: [index..., value-id]
     USELIST_CODE_BB      = 2  // BB: [index..., bb-id]
   };
 
   enum AttributeKindCodes {

lib/AsmParser/LLParser.h

struct ParamInfo {
       ParamInfo(LocTy loc, Value *v, AttributeSet attrs)
         : Loc(loc), V(v), Attrs(attrs) {}
     };
     bool ParseParameterList(SmallVectorImpl<ParamInfo> &ArgList,
                             PerFunctionState &PFS,
                             bool IsMustTailCall = false,
                             bool InVarArgsFunc = false);
 
+    bool
+    ParseOptionalOperandBundles(SmallVectorImpl<OperandBundleDef> &BundleList,
+                                PerFunctionState &PFS);
+
     bool ParseExceptionArgs(SmallVectorImpl<Value *> &Args,
                             PerFunctionState &PFS);
 
     // Constant Parsing.
     bool ParseValID(ValID &ID, PerFunctionState *PFS = nullptr);
     bool ParseGlobalValue(Type *Ty, Constant *&V);
     bool ParseGlobalTypeAndValue(Constant *&V);
     bool ParseGlobalValueVector(SmallVectorImpl<Constant *> &Elts);

lib/AsmParser/LLParser.cpp

bool LLParser::ParseParameterList(SmallVectorImpl<ParamInfo> &ArgList,
   if (IsMustTailCall && InVarArgsFunc)
     return TokError("expected '...' at end of argument list for musttail call "
                     "in varargs function");
 
   Lex.Lex();  // Lex the ')'.
   return false;
 }
 
+/// ParseOptionalOperandBundles
+///    ::= /*empty*/
+///    ::= '[' OperandBundle [, OperandBundle ]* ']'
+///
+/// OperandBundle
+///    ::= bundle-tag '(' ')'
+///    ::= bundle-tag '(' Type Value [, Type Value ]* ')'
+///
+/// bundle-tag ::= String Constant
+bool LLParser::ParseOptionalOperandBundles(
+    SmallVectorImpl<OperandBundleDef> &BundleList, PerFunctionState &PFS) {
+  LocTy BeginLoc = Lex.getLoc();
+  if (!EatIfPresent(lltok::lsquare))
+    return false;
+
+  while (Lex.getKind() != lltok::rsquare) {
+    // If this isn't the first operand bundle, we need a comma.
+    if (!BundleList.empty() &&
+        ParseToken(lltok::comma, "expected ',' in input list"))
+      return true;
+
+    std::string Tag;
+    if (ParseStringConstant(Tag))
+      return true;
+
+    BundleList.emplace_back();
+    auto &OBI = BundleList.back();
+
+    OBI.Tag = std::move(Tag);
+
+    if (ParseToken(lltok::lparen, "expected '(' in operand bundle"))
+      return true;
+
+    while (Lex.getKind() != lltok::rparen) {
+      // If this isn't the first input, we need a comma.
+      if (!OBI.Inputs.empty() &&
+          ParseToken(lltok::comma, "expected ',' in input list"))
+        return true;
 
+      Type *Ty = nullptr;
+      Value *Input = nullptr;
+      if (ParseType(Ty) || ParseValue(Ty, Input, PFS))
+        return true;
+      OBI.Inputs.push_back(Input);
+    }
+
+    Lex.Lex(); // Lex the ')'.
+  }
+
+  if (BundleList.empty())
+    return Error(BeginLoc, "operand bundle set must not be empty");
+
+  Lex.Lex(); // Lex the ']'.
+  return false;
+}
 
 /// ParseArgumentList - Parse the argument list for a function type or function
 /// prototype.
 ///   ::= '(' ArgTypeListI ')'
 /// ArgTypeListI
 ///   ::= /*empty*/
 ///   ::= '...'
 ///   ::= ArgTypeList ',' '...'
bool LLParser::ParseInvoke(Instruction *&Inst, PerFunctionState &PFS) {
   AttrBuilder RetAttrs, FnAttrs;
   std::vector<unsigned> FwdRefAttrGrps;
   LocTy NoBuiltinLoc;
   unsigned CC;
   Type *RetType = nullptr;
   LocTy RetTypeLoc;
   ValID CalleeID;
   SmallVector<ParamInfo, 16> ArgList;
+  SmallVector<OperandBundleDef, 2> BundleList;
 
   BasicBlock *NormalBB, *UnwindBB;
-  if (ParseOptionalCallingConv(CC) ||
-      ParseOptionalReturnAttrs(RetAttrs) ||
+  if (ParseOptionalCallingConv(CC) || ParseOptionalReturnAttrs(RetAttrs) ||
       ParseType(RetType, RetTypeLoc, true /*void allowed*/) ||
-      ParseValID(CalleeID) ||
-      ParseParameterList(ArgList, PFS) ||
+      ParseValID(CalleeID) || ParseParameterList(ArgList, PFS) ||
       ParseFnAttributeValuePairs(FnAttrs, FwdRefAttrGrps, false,
                                  NoBuiltinLoc) ||
+      ParseOptionalOperandBundles(BundleList, PFS) ||
       ParseToken(lltok::kw_to, "expected 'to' in invoke") ||
       ParseTypeAndBasicBlock(NormalBB, PFS) ||
       ParseToken(lltok::kw_unwind, "expected 'unwind' in invoke") ||
       ParseTypeAndBasicBlock(UnwindBB, PFS))
     return true;
 
   // If RetType is a non-function pointer type, then this is the short syntax
   // for the call, which means that RetType is just the return type.  Infer the
if (FnAttrs.hasAttributes()) {
     Attrs.push_back(AttributeSet::get(RetType->getContext(),
                                       AttributeSet::FunctionIndex,
                                       FnAttrs));
   }
 
   // Finish off the Attribute and check them
   AttributeSet PAL = AttributeSet::get(Context, Attrs);
 
-  InvokeInst *II = InvokeInst::Create(Ty, Callee, NormalBB, UnwindBB, Args);
+  InvokeInst *II =
+      InvokeInst::Create(Ty, Callee, NormalBB, UnwindBB, Args, BundleList);
   II->setCallingConv(CC);
   II->setAttributes(PAL);
   ForwardRefAttrGroups[II] = FwdRefAttrGrps;
   Inst = II;
   return false;
 }
 
 /// ParseResume
bool LLParser::ParseCall(Instruction *&Inst, PerFunctionState &PFS,
   AttrBuilder RetAttrs, FnAttrs;
   std::vector<unsigned> FwdRefAttrGrps;
   LocTy BuiltinLoc;
   unsigned CC;
   Type *RetType = nullptr;
   LocTy RetTypeLoc;
   ValID CalleeID;
   SmallVector<ParamInfo, 16> ArgList;
+  SmallVector<OperandBundleDef, 2> BundleList;
   LocTy CallLoc = Lex.getLoc();
 
   if ((TCK != CallInst::TCK_None &&
        ParseToken(lltok::kw_call, "expected 'tail call'")) ||
-      ParseOptionalCallingConv(CC) ||
-      ParseOptionalReturnAttrs(RetAttrs) ||
+      ParseOptionalCallingConv(CC) || ParseOptionalReturnAttrs(RetAttrs) ||
       ParseType(RetType, RetTypeLoc, true /*void allowed*/) ||
       ParseValID(CalleeID) ||
       ParseParameterList(ArgList, PFS, TCK == CallInst::TCK_MustTail,
                          PFS.getFunction().isVarArg()) ||
-      ParseFnAttributeValuePairs(FnAttrs, FwdRefAttrGrps, false,
-                                 BuiltinLoc))
+      ParseFnAttributeValuePairs(FnAttrs, FwdRefAttrGrps, false, BuiltinLoc) ||
+      ParseOptionalOperandBundles(BundleList, PFS))
     return true;
 
   // If RetType is a non-function pointer type, then this is the short syntax
   // for the call, which means that RetType is just the return type.  Infer the
   // rest of the function argument types from the arguments that are present.
   FunctionType *Ty = dyn_cast<FunctionType>(RetType);
   if (!Ty) {
     // Pull out the types of all of the arguments...
if (FnAttrs.hasAttributes()) {
     Attrs.push_back(AttributeSet::get(RetType->getContext(),
                                       AttributeSet::FunctionIndex,
                                       FnAttrs));
   }
 
   // Finish off the Attribute and check them
   AttributeSet PAL = AttributeSet::get(Context, Attrs);
 
-  CallInst *CI = CallInst::Create(Ty, Callee, Args);
+  CallInst *CI = CallInst::Create(Ty, Callee, Args, BundleList);
   CI->setTailCallKind(TCK);
   CI->setCallingConv(CC);
   CI->setAttributes(PAL);
   ForwardRefAttrGroups[CI] = FwdRefAttrGrps;
   Inst = CI;
   return false;
 }
 

lib/Bitcode/Reader/BitcodeReader.cpp

class BitcodeReader : public GVMaterializer {
   /// Functions that have block addresses taken.  This is usually empty.
   SmallPtrSet<const Function *, 4> BlockAddressesTaken;
 
   /// True if any Metadata block has been materialized.
   bool IsMetadataMaterialized = false;
 
   bool StripDebugInfo = false;
 
+  std::vector<std::string> BundleTags;
+
 public:
   std::error_code error(BitcodeError E, const Twine &Message);
   std::error_code error(BitcodeError E);
   std::error_code error(const Twine &Message);
 
   BitcodeReader(MemoryBuffer *Buffer, LLVMContext &Context,
                 DiagnosticHandlerFunction DiagnosticHandler);
   BitcodeReader(LLVMContext &Context,
private:
   /// a corresponding error code.
   std::error_code parseAlignmentValue(uint64_t Exponent, unsigned &Alignment);
   std::error_code parseAttrKind(uint64_t Code, Attribute::AttrKind *Kind);
   std::error_code parseModule(bool Resume, bool ShouldLazyLoadMetadata = false);
   std::error_code parseAttributeBlock();
   std::error_code parseAttributeGroupBlock();
   std::error_code parseTypeTable();
   std::error_code parseTypeTableBody();
+  std::error_code parseOperandBundleTags();
 
   std::error_code parseValueSymbolTable();
   std::error_code parseConstants();
   std::error_code rememberAndSkipFunctionBody();
   /// Save the positions of the Metadata blocks and skip parsing the blocks.
   std::error_code rememberAndSkipMetadata();
   std::error_code parseFunctionBody(Function *F);
   std::error_code globalCleanup();
while (1) {
     if (TypeList[NumRecords])
       return error(
           "Invalid TYPE table: Only named structs can be forward referenced");
     assert(ResultTy && "Didn't read a type?");
     TypeList[NumRecords++] = ResultTy;
   }
 }
 
+std::error_code BitcodeReader::parseOperandBundleTags() {
+  if (Stream.EnterSubBlock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID))
+    return error("Invalid record");
+
+  if (!BundleTags.empty())
+    return error("Invalid multiple blocks");
+
+  SmallVector<uint64_t, 64> Record;
+
+  while (1) {
+    BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
+
+    switch (Entry.Kind) {
+    case BitstreamEntry::SubBlock: // Handled for us already.
+    case BitstreamEntry::Error:
+      return error("Malformed block");
+    case BitstreamEntry::EndBlock:
+      return std::error_code();
+    case BitstreamEntry::Record:
+      // The interesting case.
+      break;
+    }
+
+    // Tags are implicitly mapped to integers by their order.
+
+    if (Stream.readRecord(Entry.ID, Record) != bitc::OPERAND_BUNDLE_TAG)
+      return error("Invalid record");
+
+    // OPERAND_BUNDLE_TAG: [strchr x N]
+    BundleTags.emplace_back();
+    if (convertToString(Record, 0, BundleTags.back()))
+      return error("Invalid record");
+    Record.clear();
+  }
+}
+
 std::error_code BitcodeReader::parseValueSymbolTable() {
   if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
     return error("Invalid record");
 
   SmallVector<uint64_t, 64> Record;
 
   Triple TT(TheModule->getTargetTriple());
 
case BitstreamEntry::SubBlock:
           NextUnreadBit = Stream.GetCurrentBitNo();
           return std::error_code();
         }
         break;
       case bitc::USELIST_BLOCK_ID:
         if (std::error_code EC = parseUseLists())
           return EC;
         break;
+      case bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID:
+        if (std::error_code EC = parseOperandBundleTags())
+          return EC;
+        break;
       }
       continue;
 
     case BitstreamEntry::Record:
       // The interesting case.
       break;
     }
 
auto getLastInstruction = [&]() -> Instruction * {
     if (CurBB && !CurBB->empty())
       return &CurBB->back();
     else if (CurBBNo && FunctionBBs[CurBBNo - 1] &&
              !FunctionBBs[CurBBNo - 1]->empty())
       return &FunctionBBs[CurBBNo - 1]->back();
     return nullptr;
   };
 
+  std::vector<OperandBundleDef> OperandBundles;
+
   // Read all the records.
   SmallVector<uint64_t, 64> Record;
   while (1) {
     BitstreamEntry Entry = Stream.advance();
 
     switch (Entry.Kind) {
     case BitstreamEntry::Error:
       return error("Malformed block");
case bitc::FUNC_CODE_INST_INVOKE: {
         while (OpNum != Record.size()) {
           Value *Op;
           if (getValueTypePair(Record, OpNum, NextValueNo, Op))
             return error("Invalid record");
           Ops.push_back(Op);
         }
       }
 
-      I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops);
+      I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops, OperandBundles);
+      OperandBundles.clear();
       InstructionList.push_back(I);
       cast<InvokeInst>(I)
           ->setCallingConv(static_cast<CallingConv::ID>(~(1U << 13) & CCInfo));
       cast<InvokeInst>(I)->setAttributes(PAL);
       break;
     }
     case bitc::FUNC_CODE_INST_RESUME: { // RESUME: [opval]
       unsigned Idx = 0;
case bitc::FUNC_CODE_INST_CALL: {
         while (OpNum != Record.size()) {
           Value *Op;
           if (getValueTypePair(Record, OpNum, NextValueNo, Op))
             return error("Invalid record");
           Args.push_back(Op);
         }
       }
 
-      I = CallInst::Create(FTy, Callee, Args);
+      I = CallInst::Create(FTy, Callee, Args, OperandBundles);
+      OperandBundles.clear();
       InstructionList.push_back(I);
       cast<CallInst>(I)->setCallingConv(
           static_cast<CallingConv::ID>((~(1U << 14) & CCInfo) >> 1));
       CallInst::TailCallKind TCK = CallInst::TCK_None;
       if (CCInfo & 1)
         TCK = CallInst::TCK_Tail;
       if (CCInfo & (1 << 14))
         TCK = CallInst::TCK_MustTail;
       cast<CallInst>(I)->setTailCallKind(TCK);
       cast<CallInst>(I)->setAttributes(PAL);
       break;
     }
     case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
       if (Record.size() < 3)
         return error("Invalid record");
       Type *OpTy = getTypeByID(Record[0]);
       Value *Op = getValue(Record, 1, NextValueNo, OpTy);
       Type *ResTy = getTypeByID(Record[2]);
       if (!OpTy || !Op || !ResTy)
         return error("Invalid record");
       I = new VAArgInst(Op, ResTy);
       InstructionList.push_back(I);
       break;
     }
+
+    case bitc::FUNC_CODE_OPERAND_BUNDLE: {
+      // A call or an invoke can be optionally prefixed with some variable
+      // number of operand bundle blocks.  These blocks are read into
+      // OperandBundles and consumed at the next call or invoke instruction.
+
+      if (Record.size() < 1 || Record[0] >= BundleTags.size())
+        return error("Invalid record");
+
+      OperandBundles.emplace_back();
+      OperandBundles.back().Tag = BundleTags[Record[0]];
+
+      std::vector<Value *> &Inputs = OperandBundles.back().Inputs;
+
+      unsigned OpNum = 1;
+      while (OpNum != Record.size()) {
+        Value *Op;
+        if (getValueTypePair(Record, OpNum, NextValueNo, Op))
+          return error("Invalid record");
+        Inputs.push_back(Op);
+      }
+
+      continue;
+    }
     }
 
     // Add instruction to end of current BB.  If there is no current BB, reject
     // this file.
     if (!CurBB) {
       delete I;
       return error("Invalid instruction with no BB");
     }
+    if (!OperandBundles.empty()) {
+      delete I;
+      return error("Operand bundles found with no consumer");
+    }
     CurBB->getInstList().push_back(I);
 
     // If this was a terminator instruction, move to the next block.
     if (isa<TerminatorInst>(I)) {
       ++CurBBNo;
       CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : nullptr;
     }
 
     // Non-void values get registered in the value table for future use.
     if (I && !I->getType()->isVoidTy())
       if (ValueList.assignValue(I, NextValueNo++))
         return error("Invalid forward reference");
   }
 
 OutOfRecordLoop:
 
+  if (!OperandBundles.empty())
+    return error("Operand bundles found with no consumer");
+
   // Check the function list for unresolved values.
   if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
     if (!A->getParent()) {
       // We found at least one unresolved value.  Nuke them all to avoid leaks.
       for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
         if ((A = dyn_cast_or_null<Argument>(ValueList[i])) && !A->getParent()) {
           A->replaceAllUsesWith(UndefValue::get(A->getType()));
           delete A;

lib/Bitcode/Writer/BitcodeWriter.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Bitcode/ReaderWriter.h"
 #include "ValueEnumerator.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Bitcode/BitstreamWriter.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
+#include "llvm/IR/CallSite.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/InlineAsm.h"
 #include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/IR/UseListOrder.h"
 #include "llvm/IR/ValueSymbolTable.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Program.h"
for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
 
     Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
     Record.clear();
   }
 
   Stream.ExitBlock();
 }
 
+static void WriteOperandBundleTags(const Module *M, BitstreamWriter &Stream) {
+  // Write metadata kinds
+  //
+  // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG
+  //
+  // OPERAND_BUNDLE_TAG - [strchr x N]
+
+  SmallVector<StringRef, 8> Tags;
+  M->getOperandBundleTags(Tags);
+
+  if (Tags.empty())
+    return;
+
+  Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
+
+  SmallVector<uint64_t, 64> Record;
+
+  for (auto Tag : Tags) {
+    Record.append(Tag.begin(), Tag.end());
+
+    Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
+    Record.clear();
+  }
+
+  Stream.ExitBlock();
+}
+
 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
   if ((int64_t)V >= 0)
     Vals.push_back(V << 1);
   else
     Vals.push_back((-V << 1) | 1);
 }
 
 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
static bool PushValueAndType(const Value *V, unsigned InstID,
   Vals.push_back(InstID - ValID);
   if (ValID >= InstID) {
     Vals.push_back(VE.getTypeID(V->getType()));
     return true;
   }
   return false;
 }
 
+static void WriteOperandBundles(BitstreamWriter &Stream, ImmutableCallSite CS,
+                                unsigned InstID, ValueEnumerator &VE) {
+  SmallVector<unsigned, 64> Record;
+  LLVMContext &C = CS.getInstruction()->getContext();
+
+  for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
+    const auto &Bundle = CS.getOperandBundle(i);
+    Record.push_back(C.getOperandBundleTagID(Bundle.Tag));
+
+    for (auto &Input : Bundle.Inputs)
+      PushValueAndType(Input, InstID, Record, VE);
+
+    Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
+    Record.clear();
+  }
+}
+
 /// pushValue - Like PushValueAndType, but where the type of the value is
 /// omitted (perhaps it was already encoded in an earlier operand).
 static void pushValue(const Value *V, unsigned InstID,
                       SmallVectorImpl<unsigned> &Vals,
                       ValueEnumerator &VE) {
   unsigned ValID = VE.getValueID(V);
   Vals.push_back(InstID - ValID);
 }
case Instruction::IndirectBr:
     for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
       Vals.push_back(VE.getValueID(I.getOperand(i)));
     break;
 
   case Instruction::Invoke: {
     const InvokeInst *II = cast<InvokeInst>(&I);
     const Value *Callee = II->getCalledValue();
     FunctionType *FTy = II->getFunctionType();
+
+    if (II->hasOperandBundles())
+      WriteOperandBundles(Stream, II, InstID, VE);
+
     Code = bitc::FUNC_CODE_INST_INVOKE;
 
     Vals.push_back(VE.getAttributeID(II->getAttributes()));
     Vals.push_back(II->getCallingConv() | 1 << 13);
     Vals.push_back(VE.getValueID(II->getNormalDest()));
     Vals.push_back(VE.getValueID(II->getUnwindDest()));
     Vals.push_back(VE.getTypeID(FTy));
     PushValueAndType(Callee, InstID, Vals, VE);
case Instruction::Fence:
     Code = bitc::FUNC_CODE_INST_FENCE;
     Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering()));
     Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope()));
     break;
   case Instruction::Call: {
     const CallInst &CI = cast<CallInst>(I);
     FunctionType *FTy = CI.getFunctionType();
 
+    if (CI.hasOperandBundles())
+      WriteOperandBundles(Stream, &CI, InstID, VE);
+
     Code = bitc::FUNC_CODE_INST_CALL;
 
     Vals.push_back(VE.getAttributeID(CI.getAttributes()));
     Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) |
                    unsigned(CI.isMustTailCall()) << 14 | 1 << 15);
     Vals.push_back(VE.getTypeID(FTy));
     PushValueAndType(CI.getCalledValue(), InstID, Vals, VE);  // Callee
 
static void WriteModule(const Module *M, BitstreamWriter &Stream,
 
   // Emit names for globals/functions etc.
   WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
 
   // Emit module-level use-lists.
   if (VE.shouldPreserveUseListOrder())
     WriteUseListBlock(nullptr, VE, Stream);
 
+  WriteOperandBundleTags(M, Stream);
+
   // Emit function bodies.
   for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F)
     if (!F->isDeclaration())
       WriteFunction(*F, VE, Stream);
 
   Stream.ExitBlock();
 }
 

lib/IR/AsmWriter.cpp

public:
 
   void printMDNodeBody(const MDNode *MD);
   void printNamedMDNode(const NamedMDNode *NMD);
 
   void printModule(const Module *M);
 
   void writeOperand(const Value *Op, bool PrintType);
   void writeParamOperand(const Value *Operand, AttributeSet Attrs,unsigned Idx);
+  void writeOperandBundles(ImmutableCallSite CS);
   void writeAtomic(AtomicOrdering Ordering, SynchronizationScope SynchScope);
   void writeAtomicCmpXchg(AtomicOrdering SuccessOrdering,
                           AtomicOrdering FailureOrdering,
                           SynchronizationScope SynchScope);
 
   void writeAllMDNodes();
   void writeMDNode(unsigned Slot, const MDNode *Node);
   void writeAllAttributeGroups();
void AssemblyWriter::writeParamOperand(const Value *Operand,
   // Print parameter attributes list
   if (Attrs.hasAttributes(Idx))
     Out << ' ' << Attrs.getAsString(Idx);
   Out << ' ';
   // Print the operand
   WriteAsOperandInternal(Out, Operand, &TypePrinter, &Machine, TheModule);
 }
 
+void AssemblyWriter::writeOperandBundles(ImmutableCallSite CS) {
+  if (!CS.hasOperandBundles())
+    return;
+
+  Out << " [ ";
+
+  bool FirstBundle = true;
+  for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
+    OperandBundleUse BU = CS.getOperandBundle(i);
+
+    if (!FirstBundle)
+      Out << ", ";
+    FirstBundle = false;
+
+    Out << '"';
+    PrintEscapedString(BU.Tag, Out);
+    Out << '"';
+
+    Out << '(';
+
+    bool FirstInput = true;
+    for (const auto &Input : BU.Inputs) {
+      if (!FirstInput)
+        Out << ", ";
+      FirstInput = false;
+
+      TypePrinter.print(Input->getType(), Out);
+      Out << " ";
+      WriteAsOperandInternal(Out, Input, &TypePrinter, &Machine, TheModule);
+    }
+
+    Out << ')';
+  }
+
+  Out << " ]";
+}
+
 void AssemblyWriter::printModule(const Module *M) {
   Machine.initialize();
 
   if (ShouldPreserveUseListOrder)
     UseListOrders = predictUseListOrder(M);
 
   if (!M->getModuleIdentifier().empty() &&
       // Don't print the ID if it will start a new line (which would
if (isa<BranchInst>(I) && cast<BranchInst>(I).isConditional()) {
     if (CI->isMustTailCall() && CI->getParent() &&
         CI->getParent()->getParent() &&
         CI->getParent()->getParent()->isVarArg())
       Out << ", ...";
 
     Out << ')';
     if (PAL.hasAttributes(AttributeSet::FunctionIndex))
       Out << " #" << Machine.getAttributeGroupSlot(PAL.getFnAttributes());
+
+    writeOperandBundles(CI);
+
   } else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
     Operand = II->getCalledValue();
     FunctionType *FTy = cast<FunctionType>(II->getFunctionType());
     Type *RetTy = FTy->getReturnType();
     const AttributeSet &PAL = II->getAttributes();
 
     // Print the calling convention being used.
     if (II->getCallingConv() != CallingConv::C) {
for (unsigned op = 0, Eop = II->getNumArgOperands(); op < Eop; ++op) {
         Out << ", ";
       writeParamOperand(II->getArgOperand(op), PAL, op + 1);
     }
 
     Out << ')';
     if (PAL.hasAttributes(AttributeSet::FunctionIndex))
       Out << " #" << Machine.getAttributeGroupSlot(PAL.getFnAttributes());
 
+    writeOperandBundles(II);
+
     Out << "\n          to ";
     writeOperand(II->getNormalDest(), true);
     Out << " unwind ";
     writeOperand(II->getUnwindDest(), true);
 
   } else if (const AllocaInst *AI = dyn_cast<AllocaInst>(&I)) {
     Out << ' ';
     if (AI->isUsedWithInAlloca())

test/Bitcode/compatibility.ll

 ; Bitcode compatibility test for llvm
 ;
 ; Please update this file when making any IR changes. Information on the
 ; release process for this file is available here:
 ;
 ;     http://llvm.org/docs/DeveloperPolicy.html#ir-backwards-compatibility 
 
 ; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
-; RUN: verify-uselistorder < %s
+; RUN-PR24755: verify-uselistorder < %s
 
 target datalayout = "E"
 ; CHECK: target datalayout = "E"
 
 target triple = "x86_64-apple-macosx10.10.0"
 ; CHECK: target triple = "x86_64-apple-macosx10.10.0"
 
 ;; Module-level assembly

 define void @misc.metadata() {
   call void @f1(), !srcloc !11
   call void @f1(), !srcloc !12
   call void @f1(), !srcloc !13
   call void @f1(), !srcloc !14
   ret void
 }
 
+declare void @op_bundle_callee_0()
+declare void @op_bundle_callee_1(i32,i32)
+
+define void @call_with_operand_bundle0(i32* %ptr) {
+; CHECK-LABEL: call_with_operand_bundle0(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+; CHECK: call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+  ret void
+}
+
+define void @call_with_operand_bundle1(i32* %ptr) {
+; CHECK-LABEL: call_with_operand_bundle1(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+
+  call void @op_bundle_callee_0()
+  call void @op_bundle_callee_0() [ "foo"() ]
+  call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+; CHECK: @op_bundle_callee_0(){{$}}
+; CHECK-NEXT: call void @op_bundle_callee_0() [ "foo"() ]
+; CHECK-NEXT: call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+  ret void
+}
+
+define void @call_with_operand_bundle2(i32* %ptr) {
+; CHECK-LABEL: call_with_operand_bundle2(
+ entry:
+  call void @op_bundle_callee_0() [ "foo"() ]
+; CHECK: call void @op_bundle_callee_0() [ "foo"() ]
+  ret void
+}
+
+define void @call_with_operand_bundle3(i32* %ptr) {
+; CHECK-LABEL: call_with_operand_bundle3(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+; CHECK: call void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+  ret void
+}
+
+define void @call_with_operand_bundle4(i32* %ptr) {
+; CHECK-LABEL: call_with_operand_bundle4(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @op_bundle_callee_1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+; CHECK: call void @op_bundle_callee_1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+  ret void
+}
+
+; Invoke versions of the above tests:
+
+
+define void @invoke_with_operand_bundle0(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @invoke_with_operand_bundle0(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ] to label %normal unwind label %exception
+; CHECK: invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @invoke_with_operand_bundle1(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @invoke_with_operand_bundle1(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+
+  invoke void @op_bundle_callee_0() to label %normal unwind label %exception
+; CHECK: invoke void @op_bundle_callee_0(){{$}}
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+
+normal:
+  invoke void @op_bundle_callee_0() [ "foo"() ] to label %normal1 unwind label %exception1
+; CHECK: invoke void @op_bundle_callee_0() [ "foo"() ]
+
+exception1:
+  %cleanup1 = landingpad i8 cleanup
+  br label %normal1
+
+normal1:
+  invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ] to label %normal2 unwind label %exception2
+; CHECK: invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception2:
+  %cleanup2 = landingpad i8 cleanup
+  br label %normal2
+
+normal2:
+  ret void
+}
+
+define void @invoke_with_operand_bundle2(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @invoke_with_operand_bundle2(
+ entry:
+  invoke void @op_bundle_callee_0() [ "foo"() ] to label %normal unwind label %exception
+; CHECK: invoke void @op_bundle_callee_0() [ "foo"() ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @invoke_with_operand_bundle3(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @invoke_with_operand_bundle3(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ] to label %normal unwind label %exception
+; CHECK: invoke void @op_bundle_callee_0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @invoke_with_operand_bundle4(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @invoke_with_operand_bundle4(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @op_bundle_callee_1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+        to label %normal unwind label %exception
+; CHECK: invoke void @op_bundle_callee_1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+
 ; CHECK: attributes #0 = { alignstack=4 }
 ; CHECK: attributes #1 = { alignstack=8 }
 ; CHECK: attributes #2 = { alwaysinline }
 ; CHECK: attributes #3 = { cold }
 ; CHECK: attributes #4 = { convergent }
 ; CHECK: attributes #5 = { inlinehint }
 ; CHECK: attributes #6 = { jumptable }
 ; CHECK: attributes #7 = { minsize }

test/Bitcode/operand-bundles.ll

+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+
+declare void @callee0()
+declare void @callee1(i32,i32)
+
+define void @f0(i32* %ptr) {
+; CHECK-LABEL: @f0(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+; CHECK: call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+  ret void
+}
+
+define void @f1(i32* %ptr) {
+; CHECK-LABEL: @f1(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+
+  call void @callee0()
+  call void @callee0() [ "foo"() ]
+  call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+; CHECK: @callee0(){{$}}
+; CHECK-NEXT: call void @callee0() [ "foo"() ]
+; CHECK-NEXT: call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+  ret void
+}
+
+define void @f2(i32* %ptr) {
+; CHECK-LABEL: @f2(
+ entry:
+  call void @callee0() [ "foo"() ]
+; CHECK: call void @callee0() [ "foo"() ]
+  ret void
+}
+
+define void @f3(i32* %ptr) {
+; CHECK-LABEL: @f3(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+; CHECK: call void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+  ret void
+}
+
+define void @f4(i32* %ptr) {
+; CHECK-LABEL: @f4(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  call void @callee1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+; CHECK: call void @callee1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+  ret void
+}
+
+; Invoke versions of the above tests:
+
+
+define void @g0(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @g0(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ] to label %normal unwind label %exception
+; CHECK: invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float  0.000000e+00, i64 100, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @g1(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @g1(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+
+  invoke void @callee0() to label %normal unwind label %exception
+; CHECK: invoke void @callee0(){{$}}
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+
+normal:
+  invoke void @callee0() [ "foo"() ] to label %normal1 unwind label %exception1
+; CHECK: invoke void @callee0() [ "foo"() ]
+
+exception1:
+  %cleanup1 = landingpad i8 cleanup
+  br label %normal1
+
+normal1:
+  invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ] to label %normal2 unwind label %exception2
+; CHECK: invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception2:
+  %cleanup2 = landingpad i8 cleanup
+  br label %normal2
+
+normal2:
+  ret void
+}
+
+define void @g2(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @g2(
+ entry:
+  invoke void @callee0() [ "foo"() ] to label %normal unwind label %exception
+; CHECK: invoke void @callee0() [ "foo"() ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @g3(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @g3(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ] to label %normal unwind label %exception
+; CHECK: invoke void @callee0() [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}
+
+define void @g4(i32* %ptr) personality i8 3 {
+; CHECK-LABEL: @g4(
+ entry:
+  %l = load i32, i32* %ptr
+  %x = add i32 42, 1
+  invoke void @callee1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+        to label %normal unwind label %exception
+; CHECK: invoke void @callee1(i32 10, i32 %x) [ "foo"(i32 42, i64 100, i32 %x), "foo"(i32 42, float  0.000000e+00, i32 %l) ]
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+normal:
+  ret void
+}

test/Verifier/operand-bundles.ll

+; RUN: not opt -verify < %s 2>&1 | FileCheck %s
+
+; Operand bundles uses are like regular uses, and need to be dominated
+; by their defs.
+
+declare void @g()
+
+define void @f0(i32* %ptr) {
+; CHECK: Instruction does not dominate all uses!
+; CHECK-NEXT:  %x = add i32 42, 1
+; CHECK-NEXT:  call void @g() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float 0.000000e+00, i64 100, i32 %l) ]
+
+ entry:
+  %l = load i32, i32* %ptr
+  call void @g() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float 0.0, i64 100, i32 %l) ]
+  %x = add i32 42, 1
+  ret void
+}
+
+define void @f1(i32* %ptr) personality i8 3 {
+; CHECK: Instruction does not dominate all uses!
+; CHECK-NEXT:  %x = add i32 42, 1
+; CHECK-NEXT:  invoke void @g() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float 0.000000e+00, i64 100, i32 %l) ]
+
+ entry:
+  %l = load i32, i32* %ptr
+  invoke void @g() [ "foo"(i32 42, i64 100, i32 %x), "bar"(float 0.0, i64 100, i32 %l) ] to label %normal unwind label %exception
+
+exception:
+  %cleanup = landingpad i8 cleanup
+  br label %normal
+
+normal:
+  %x = add i32 42, 1
+  ret void
+}