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Revert "r223440 - Consider subregs when calling MI::registerDefIsDead for phys deps"

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Reverting this because, while it fixes the problem in the reduced test case, it
does not fix the problem in the full test case from the bug report.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223442 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2014-12-05 02:07:35 +00:00
parent d281f1443a
commit 138d5bf371
2 changed files with 1 additions and 175 deletions
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lib/CodeGen/ScheduleDAGInstrs.cpp
+1 -7
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@@ -310,15 +310,9 @@ void ScheduleDAGInstrs::addPhysRegDeps(SUnit *SU, unsigned OperIdx) {
SUnit *DefSU = I->SU;
if (DefSU == &ExitSU)
continue;
auto IsDefDead = [this](SUnit *DefSU, unsigned Reg) {
for (MCSubRegIterator SR(Reg, TRI, true); SR.isValid(); ++SR)
if (!DefSU->getInstr()->registerDefIsDead(*SR))
return false;
return true;
};
if (DefSU != SU &&
(Kind != SDep::Output || !MO.isDead() ||
!IsDefDead(DefSU, *Alias))) {
!DefSU->getInstr()->registerDefIsDead(*Alias))) {
if (Kind == SDep::Anti)
DefSU->addPred(SDep(SU, Kind, /*Reg=*/*Alias));
else {