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Code clean up. 

llvm-svn: 99544
This commit is contained in:
Evan Cheng 2010-03-25 19:46:11 +00:00
parent 6432bd744e
commit 510bda2064
1 changed files with 10 additions and 11 deletions
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21
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1640,8 +1640,8 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
else if (RealSrcReg)
SavedLI.reset(li_->dupInterval(&DstInt));
// Check if it is necessary to propagate "isDead" property.
if (!isExtSubReg && !isInsSubReg && !isSubRegToReg) {
// Check if it is necessary to propagate "isDead" property.
MachineOperand *mopd = CopyMI->findRegisterDefOperand(DstReg, false);
bool isDead = mopd->isDead();
@ -1690,16 +1690,15 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
// been modified, so we can use this information below to update aliases.
bool Swapped = false;
// If SrcInt is implicitly defined, it's safe to coalesce.
bool isEmpty = SrcInt.empty();
if (isEmpty && !CanCoalesceWithImpDef(CopyMI, DstInt, SrcInt)) {
// Only coalesce an empty interval (defined by implicit_def) with
// another interval which has a valno defined by the CopyMI and the CopyMI
// is a kill of the implicit def.
DEBUG(dbgs() << "Not profitable!\n");
return false;
}
if (!isEmpty && !JoinIntervals(DstInt, SrcInt, Swapped)) {
if (SrcInt.empty()) {
if (!CanCoalesceWithImpDef(CopyMI, DstInt, SrcInt)) {
// Only coalesce an empty interval (defined by implicit_def) with
// another interval which has a valno defined by the CopyMI and the CopyMI
// is a kill of the implicit def.
DEBUG(dbgs() << "Not profitable!\n");
return false;
}
} else if (!JoinIntervals(DstInt, SrcInt, Swapped)) {
// Coalescing failed.
// If definition of source is defined by trivial computation, try