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Add a thread-model knob for lowering atomics on baremetal & single threaded systems

Browse Source 
http://reviews.llvm.org/D4984


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216182 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jonathan Roelofs
2014-08-21 14:35:47 +00:00
parent 0b994a70b0
commit 4c3be1aa0f
5 changed files with 146 additions and 3 deletions
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lib/Target/ARM/ARMTargetMachine.cpp
+4 -1
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@@ -158,7 +158,10 @@ TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
}
void ARMPassConfig::addIRPasses() {
addPass(createAtomicExpandLoadLinkedPass(TM));
if (TM->Options.ThreadModel == ThreadModel::Single)
addPass(createLowerAtomicPass());
else
addPass(createAtomicExpandLoadLinkedPass(TM));
// Cmpxchg instructions are often used with a subsequent comparison to
// determine whether it succeeded. We can exploit existing control-flow in