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TwoAddressInstructionPass::CoalesceExtSubRegs can insert INSERT_SUBREG

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instructions, but it doesn't really understand live ranges, so the first
INSERT_SUBREG uses an implicitly defined register.

Fix it in LiveVariableAnalysis by adding the <undef> flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106333 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-06-18 22:29:44 +00:00
parent 6a5e2832d0
commit 0465bcffbb
2 changed files with 36 additions and 1 deletions
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9
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -329,9 +329,16 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (mi->isExtractSubreg() || mi->isInsertSubreg() || mi->isSubregToReg() ||
tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg))
tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg)) {
CopyMI = mi;
// Some of the REG_SEQUENCE lowering in TwoAddressInstrPass creates
// implicit defs without really knowing. It shows up as INSERT_SUBREG
// using an undefined register.
if (mi->isInsertSubreg())
mi->getOperand(1).setIsUndef();
}
VNInfo *ValNo = interval.getNextValue(defIndex, CopyMI, true,
VNInfoAllocator);
assert(ValNo->id == 0 && "First value in interval is not 0?");