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Let callers decide the sub-register index on the def operand of rematerialized instructions.

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Avoid remat'ing instructions whose def have sub-register indices for now. It's just really really hard to get all the cases right.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75900 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-16 09:20:10 +00:00
parent 6ef40b11f8
commit 378445303b
20 changed files with 277 additions and 49 deletions
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7
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -1157,6 +1157,11 @@ bool LiveIntervals::isReMaterializable(const LiveInterval &li,
if (DisableReMat)
return false;
// FIXME: For now, avoid remating instructions whose definition has a subreg
// index. It's just incredibly difficult to get right.
if (MI->findRegisterDefOperand(li.reg)->getSubReg())
return false;
if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
return true;
@ -1595,7 +1600,7 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
if (CreatedNewVReg) {
if (DefIsReMat) {
vrm.setVirtIsReMaterialized(NewVReg, ReMatDefMI/*, CanDelete*/);
vrm.setVirtIsReMaterialized(NewVReg, ReMatDefMI);
if (ReMatIds[VNI->id] == VirtRegMap::MAX_STACK_SLOT) {
// Each valnum may have its own remat id.
ReMatIds[VNI->id] = vrm.assignVirtReMatId(NewVReg);