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R600/structurizer: improve PHI value finding 

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>
llvm-svn: 175346
This commit is contained in:
Christian Konig 2013-02-16 11:27:35 +00:00
parent d08e3d753e
commit 0bccf9d60b
1 changed files with 6 additions and 0 deletions
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6
llvm/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) {