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Revert part of r147716. Looks like x87 instructions kill markers are all messed

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up so branch folding pass can't use the scavenger. :-(  This doesn't breaks
anything currently. It just means targets which do not carefully update kill
markers cannot run post-ra scheduler (not new, it has always been the case).

We should fix this at some point since it's really hacky.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147719 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2012-01-07 03:35:48 +00:00
parent acdb4aaf9b
commit 70017fb01b
1 changed files with 11 additions and 9 deletions
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20
lib/CodeGen/BranchFolding.cpp
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@ -180,7 +180,7 @@ bool BranchFolder::OptimizeFunction(MachineFunction &MF,
TRI = tri;
MMI = mmi;
RS = new RegScavenger();
RS = TRI->requiresRegisterScavenging(MF) ? new RegScavenger() : NULL;
// Fix CFG. The later algorithms expect it to be right.
bool MadeChange = false;
@ -368,14 +368,16 @@ static unsigned ComputeCommonTailLength(MachineBasicBlock *MBB1,
void BranchFolder::MaintainLiveIns(MachineBasicBlock *CurMBB,
MachineBasicBlock *NewMBB) {
RS->enterBasicBlock(CurMBB);
if (!CurMBB->empty())
RS->forward(prior(CurMBB->end()));
BitVector RegsLiveAtExit(TRI->getNumRegs());
RS->getRegsUsed(RegsLiveAtExit, false);
for (unsigned int i = 0, e = TRI->getNumRegs(); i != e; i++)
if (RegsLiveAtExit[i])
NewMBB->addLiveIn(i);
if (RS) {
RS->enterBasicBlock(CurMBB);
if (!CurMBB->empty())
RS->forward(prior(CurMBB->end()));
BitVector RegsLiveAtExit(TRI->getNumRegs());
RS->getRegsUsed(RegsLiveAtExit, false);
for (unsigned int i = 0, e = TRI->getNumRegs(); i != e; i++)
if (RegsLiveAtExit[i])
NewMBB->addLiveIn(i);
}
}
/// ReplaceTailWithBranchTo - Delete the instruction OldInst and everything