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Atomics: switch direction of cmpxchg comparison

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This has two benefits: it makes the result more suitable for direct
insertaion into the struct to emulate the new cmpxchg, and it means
the name we give the instruction matches its actual effect better.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210916 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover
2014-06-13 16:45:36 +00:00
parent 61bc72e9ae
commit 6b3ed2b821
3 changed files with 18 additions and 18 deletions
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4
lib/CodeGen/AtomicExpandLoadLinkedPass.cpp
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@ -283,9 +283,9 @@ bool AtomicExpandLoadLinked::expandAtomicCmpXchg(AtomicCmpXchgInst *CI) {
Builder.SetInsertPoint(TryStoreBB);
Value *StoreSuccess = TLI->emitStoreConditional(
Builder, CI->getNewValOperand(), Addr, MemOpOrder);
Value *TryAgain = Builder.CreateICmpNE(
StoreSuccess = Builder.CreateICmpEQ(
StoreSuccess, ConstantInt::get(Type::getInt32Ty(Ctx), 0), "success");
Builder.CreateCondBr(TryAgain, LoopBB, BarrierBB);
Builder.CreateCondBr(StoreSuccess, BarrierBB, LoopBB);
// Make sure later instructions don't get reordered with a fence if necessary.
Builder.SetInsertPoint(BarrierBB);