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Initial implementation of 'fence' instruction, the new C++0x-style replacement for llvm.memory.barrier.

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This is just a LangRef entry and reading/writing/memory representation; optimizer+codegen support coming soon.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-07-25 23:16:38 +00:00
parent 5a1cb644c9
commit 47f3513dd5
18 changed files with 392 additions and 32 deletions
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33
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -131,6 +131,27 @@ static int GetDecodedBinaryOpcode(unsigned Val, Type *Ty) {
}
}
static AtomicOrdering GetDecodedOrdering(unsigned Val) {
switch (Val) {
case bitc::ORDERING_NOTATOMIC: return NotAtomic;
case bitc::ORDERING_UNORDERED: return Unordered;
case bitc::ORDERING_MONOTONIC: return Monotonic;
case bitc::ORDERING_ACQUIRE: return Acquire;
case bitc::ORDERING_RELEASE: return Release;
case bitc::ORDERING_ACQREL: return AcquireRelease;
default: // Map unknown orderings to sequentially-consistent.
case bitc::ORDERING_SEQCST: return SequentiallyConsistent;
}
}
static SynchronizationScope GetDecodedSynchScope(unsigned Val) {
switch (Val) {
case bitc::SYNCHSCOPE_SINGLETHREAD: return SingleThread;
default: // Map unknown scopes to cross-thread.
case bitc::SYNCHSCOPE_CROSSTHREAD: return CrossThread;
}
}
namespace llvm {
namespace {
/// @brief A class for maintaining the slot number definition
@ -2534,6 +2555,18 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
InstructionList.push_back(I);
break;
}
case bitc::FUNC_CODE_INST_FENCE: { // FENCE:[ordering, synchscope]
if (2 != Record.size())
return Error("Invalid FENCE record");
AtomicOrdering Ordering = GetDecodedOrdering(Record[0]);
if (Ordering == NotAtomic || Ordering == Unordered ||
Ordering == Monotonic)
return Error("Invalid FENCE record");
SynchronizationScope SynchScope = GetDecodedSynchScope(Record[1]);
I = new FenceInst(Context, Ordering, SynchScope);
InstructionList.push_back(I);
break;
}
case bitc::FUNC_CODE_INST_CALL: {
// CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...]
if (Record.size() < 3)