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Yes, if the redef is a copy, update the old val# with the copy. But make sure to clear the copy field if the redef is not a copy.

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llvm-svn: 103922
This commit is contained in:
Evan Cheng 2010-05-17 01:47:47 +00:00
parent 142431a069
commit e4766e6bda
1 changed files with 7 additions and 8 deletions
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15
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -454,14 +454,13 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Value#0 is now defined by the 2-addr instruction.
OldValNo->def = RedefIndex;
if (!PartReDef)
OldValNo->setCopy(0);
else {
// A re-def may be a copy. e.g. %reg1030:6<def> = VMOVD %reg1026, ...
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg))
OldValNo->setCopy(&*mi);
}
OldValNo->setCopy(0);
// A re-def may be a copy. e.g. %reg1030:6<def> = VMOVD %reg1026, ...
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (PartReDef &&
tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg))
OldValNo->setCopy(&*mi);
// Add the new live interval which replaces the range for the input copy.
LiveRange LR(DefIndex, RedefIndex, ValNo);