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| author | David Majnemer <david.majnemer@gmail.com> | 2015-02-13 07:55:47 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2015-02-13 07:55:47 +0000 |
| commit | abc482effcabd373f5c96fb8f9dd493968a112dd (patch) | |
| tree | 2b1eb59e9ebf337925c18d2ad7537c0d60995c27 /clang/lib/CodeGen/CGExprComplex.cpp | |
| parent | 2a903b900d212dfaf5482408042a6f7b9e87c9a6 (diff) | |
| download | llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.zip llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.tar.gz llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.tar.bz2 | |
MS ABI: Implement /volatile:ms
The /volatile:ms semantics turn volatile loads and stores into atomic
acquire and release operations. This distinction is important because
volatile memory operations do not form a happens-before relationship
with non-atomic memory. This means that a volatile store is not
sufficient for implementing a mutex unlock routine.
Differential Revision: http://reviews.llvm.org/D7580
llvm-svn: 229082
Diffstat (limited to 'clang/lib/CodeGen/CGExprComplex.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGExprComplex.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp index ceec85a..1fea5a1 100644 --- a/clang/lib/CodeGen/CGExprComplex.cpp +++ b/clang/lib/CodeGen/CGExprComplex.cpp @@ -336,7 +336,8 @@ ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue, /// specified value pointer. void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue, bool isInit) { - if (lvalue.getType()->isAtomicType()) + if (lvalue.getType()->isAtomicType() || + (!isInit && CGF.LValueIsSuitableForInlineAtomic(lvalue))) return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit); llvm::Value *Ptr = lvalue.getAddress(); |