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Fix an easy fixme.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-07-03 05:26:42 +00:00
parent 78e4fcecef
commit 65268575c4
1 changed files with 10 additions and 6 deletions
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16
lib/CodeGen/RegisterCoalescer.cpp
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@ -1214,12 +1214,6 @@ static bool RegistersDefinedFromSameValue(LiveIntervals &li,
unsigned Dst = MI->getOperand(0).getReg();
unsigned Src = MI->getOperand(1).getReg();
// FIXME: If "B = X" kills X, we have to move the kill back to its
// previous use. For now we just avoid the optimization in that case.
LiveInterval &SrcInt = li.getInterval(Src);
if (SrcInt.killedAt(VNI->def))
return false;
if (!TargetRegisterInfo::isVirtualRegister(Src) ||
!TargetRegisterInfo::isVirtualRegister(Dst))
return false;
@ -1253,6 +1247,7 @@ static bool RegistersDefinedFromSameValue(LiveIntervals &li,
// If the copies use two different value numbers of X, we cannot merge
// A and B.
LiveInterval &SrcInt = li.getInterval(Src);
if (SrcInt.getVNInfoAt(Other->def) != SrcInt.getVNInfoAt(VNI->def))
return false;
@ -1476,6 +1471,7 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) {
if (RHSValNoAssignments.empty())
RHSValNoAssignments.push_back(-1);
SmallVector<unsigned, 8> SourceRegisters;
for (SmallVector<MachineInstr*, 8>::iterator I = DupCopies.begin(),
E = DupCopies.end(); I != E; ++I) {
MachineInstr *MI = *I;
@ -1489,11 +1485,19 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) {
// X = X
// and mark the X as coalesced to keep the illusion.
unsigned Src = MI->getOperand(1).getReg();
SourceRegisters.push_back(Src);
MI->getOperand(0).substVirtReg(Src, 0, *tri_);
markAsJoined(MI);
}
// If B = X was the last use of X in a liverange, we have to shrink it now
// that B = X is gone.
for (SmallVector<unsigned, 8>::iterator I = SourceRegisters.begin(),
E = SourceRegisters.end(); I != E; ++I) {
li_->shrinkToUses(&li_->getInterval(*I));
}
// If we get here, we know that we can coalesce the live ranges. Ask the
// intervals to coalesce themselves now.
LHS.join(RHS, &LHSValNoAssignments[0], &RHSValNoAssignments[0], NewVNInfo,