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[SystemZ] Enable the use of MVC for frame-to-frame spills

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...now that the problem that prompted the restriction has been fixed.

The original spill-02.py was a compromise because at the time I couldn't
find an example that actually failed without the two scavenging slots.
The version included here did.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185701 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-07-05 14:02:01 +00:00
parent 457571ed69
commit cf1b5bd60a
2 changed files with 59 additions and 40 deletions
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12
lib/Target/SystemZ/SystemZInstrInfo.cpp
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@@ -363,18 +363,11 @@ SystemZInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
// not valid in cases where the two memories partially overlap; however,
// that is not a problem here, because we know that one of the memories
// is a full frame index.
//
// For now we punt if the load or store is also to a frame index.
// In that case we might end up eliminating both of them to out-of-range
// offsets, which might then force the register scavenger to spill two
// other registers. The backend can only handle one such scavenger spill
// at a time.
if (OpNum == 0 && MI->hasOneMemOperand()) {
MachineMemOperand *MMO = *MI->memoperands_begin();
if (MMO->getSize() == Size && !MMO->isVolatile()) {
// Handle conversion of loads.
if (isSimpleBD12Move(MI, SystemZII::SimpleBDXLoad) &&
!MI->getOperand(1).isFI()) {
if (isSimpleBD12Move(MI, SystemZII::SimpleBDXLoad)) {
uint64_t Offset = 0;
MachineMemOperand *FrameMMO = getFrameMMO(MF, FrameIndex, Offset,
MachineMemOperand::MOStore);
@@ -384,8 +377,7 @@ SystemZInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
.addMemOperand(FrameMMO).addMemOperand(MMO);
}
// Handle conversion of stores.
if (isSimpleBD12Move(MI, SystemZII::SimpleBDXStore) &&
!MI->getOperand(1).isFI()) {
if (isSimpleBD12Move(MI, SystemZII::SimpleBDXStore)) {
uint64_t Offset = 0;
MachineMemOperand *FrameMMO = getFrameMMO(MF, FrameIndex, Offset,
MachineMemOperand::MOLoad);