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Fix an issue in PHI construction that was exposed by GCC 4.2 producing a different set iteration order for the reg_iterator.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63490 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2009-02-01 07:06:00 +00:00
parent 2d5424d76a
commit 5caedc0f09
1 changed files with 27 additions and 40 deletions
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21
lib/CodeGen/PreAllocSplitting.cpp
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@@ -467,22 +467,6 @@ VNInfo* PreAllocSplitting::PerformPHIConstruction(
unsigned StartIndex = LIs->getMBBStartIdx(MBB);
if (MBB->pred_size() == 1) {
Phis[MBB] = ret = PerformPHIConstruction((*MBB->pred_begin())->end(),
*(MBB->pred_begin()), LI, Visited,
Defs, Uses, NewVNs, LiveOut, Phis,
false, false);
unsigned EndIndex = 0;
if (intrablock) {
EndIndex = LIs->getInstructionIndex(use);
EndIndex = LiveIntervals::getUseIndex(EndIndex);
} else
EndIndex = LIs->getMBBEndIdx(MBB);
LI->addRange(LiveRange(StartIndex, EndIndex+1, ret));
if (intrablock)
LI->addKill(ret, EndIndex);
} else {
Phis[MBB] = ret = LI->getNextValue(~0U, /*FIXME*/ 0,
LIs->getVNInfoAllocator());
if (!intrablock) LiveOut[MBB] = ret;
@@ -500,6 +484,9 @@ VNInfo* PreAllocSplitting::PerformPHIConstruction(
IncomingVNs[*PI] = Incoming;
}
if (MBB->pred_size() == 1 && !ret->hasPHIKill) {
LI->MergeValueNumberInto(ret, IncomingVNs.begin()->second);
} else {
// Otherwise, merge the incoming VNInfos with a phi join. Create a new
// VNInfo to represent the joined value.
for (DenseMap<MachineBasicBlock*, VNInfo*>::iterator I =
@@ -509,6 +496,7 @@ VNInfo* PreAllocSplitting::PerformPHIConstruction(
if (!LiveInterval::isKill(I->second, KillIndex))
LI->addKill(I->second, KillIndex);
}
}
unsigned EndIndex = 0;
if (intrablock) {
@@ -519,7 +507,6 @@ VNInfo* PreAllocSplitting::PerformPHIConstruction(
LI->addRange(LiveRange(StartIndex, EndIndex+1, ret));
if (intrablock)
LI->addKill(ret, EndIndex);
}
} else if (ContainsDefs && !ContainsUses) {
SmallPtrSet<MachineInstr*, 2>& BlockDefs = Defs[MBB];