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Add a new subtarget hook for whether or not we'd like to enable

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the atomic load linked expander pass to run for a particular
subtarget. This requires a check of the subtarget and so save
the TargetMachine rather than only TargetLoweringInfo and update
all callers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211314 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2014-06-19 21:03:04 +00:00
parent e0d89ff764
commit d2f9358649
6 changed files with 39 additions and 21 deletions
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13
lib/Target/ARM/ARMTargetMachine.cpp
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@@ -171,16 +171,15 @@ TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
}
void ARMPassConfig::addIRPasses() {
const ARMSubtarget *Subtarget = &getARMSubtarget();
if (Subtarget->hasAnyDataBarrier() && !Subtarget->isThumb1Only()) {
addPass(createAtomicExpandLoadLinkedPass(TM));
addPass(createAtomicExpandLoadLinkedPass(TM));
// Cmpxchg instructions are often used with a subsequent comparison to
// determine whether it succeeded. We can exploit existing control-flow in
// ldrex/strex loops to simplify this, but it needs tidying up.
// Cmpxchg instructions are often used with a subsequent comparison to
// determine whether it succeeded. We can exploit existing control-flow in
// ldrex/strex loops to simplify this, but it needs tidying up.
const ARMSubtarget *Subtarget = &getARMSubtarget();
if (Subtarget->hasAnyDataBarrier() && !Subtarget->isThumb1Only())
if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
addPass(createCFGSimplificationPass());
}
TargetPassConfig::addIRPasses();
}