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R600/structurizer: improve PHI value finding

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Using the new NearestCommonDominator class.

This is a candidate for the stable branch.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175346 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Christian Konig 2013-02-16 11:27:35 +00:00
parent f0e469bcaf
commit 4c79c71d99
1 changed files with 6 additions and 0 deletions
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6
lib/Target/R600/AMDGPUStructurizeCFG.cpp
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@ -533,12 +533,18 @@ void AMDGPUStructurizeCFG::setPhiValues() {
Updater.AddAvailableValue(&Func->getEntryBlock(), Undef);
Updater.AddAvailableValue(To, Undef);
NearestCommonDominator Dominator(DT);
Dominator.addBlock(To, false);
for (BBValueVector::iterator VI = PI->second.begin(),
VE = PI->second.end(); VI != VE; ++VI) {
Updater.AddAvailableValue(VI->first, VI->second);
Dominator.addBlock(VI->first);
}
if (!Dominator.wasResultExplicitMentioned())
Updater.AddAvailableValue(Dominator.getResult(), Undef);
for (BBVector::iterator FI = From.begin(), FE = From.end();
FI != FE; ++FI) {