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The physical register + virtual register joining requirement was much too strict. 

llvm-svn: 45253
This commit is contained in:
Evan Cheng 2007-12-20 02:23:25 +00:00
parent 61bc51ee97
commit a509537e25
1 changed files with 1 additions and 1 deletions
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2
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -396,7 +396,7 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec TheCopy, bool &Again) {
unsigned JoinVReg = SrcIsPhys ? repDstReg : repSrcReg;
unsigned JoinPReg = SrcIsPhys ? repSrcReg : repDstReg;
const TargetRegisterClass *RC = mf_->getSSARegMap()->getRegClass(JoinVReg);
unsigned Threshold = allocatableRCRegs_[RC].count();
unsigned Threshold = allocatableRCRegs_[RC].count() * 2;
if (TheCopy.isBackEdge)
Threshold *= 2; // Favors back edge copies.