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A partial re-def instruction may be a copy.

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llvm-svn: 103850
This commit is contained in:
Evan Cheng 2010-05-15 01:35:44 +00:00
parent 0a651c3314
commit d95a4505dc
1 changed files with 8 additions and 1 deletions
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9
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -454,7 +454,14 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Value#0 is now defined by the 2-addr instruction.
OldValNo->def = RedefIndex;
OldValNo->setCopy(0);
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);
}
// Add the new live interval which replaces the range for the input copy.
LiveRange LR(DefIndex, RedefIndex, ValNo);