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Avoid creating BitVector temporaries. 

llvm-svn: 149188
This commit is contained in:
Jakob Stoklund Olesen 2012-01-29 01:29:25 +00:00
parent aaeaae07c4
commit 8b1853ddef
1 changed files with 7 additions and 7 deletions
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14
llvm/lib/CodeGen/RegisterScavenging.cpp
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@ -234,10 +234,10 @@ void RegScavenger::forward() {
}
void RegScavenger::getRegsUsed(BitVector &used, bool includeReserved) {
if (includeReserved)
used = ~RegsAvailable;
else
used = ~RegsAvailable & ~ReservedRegs;
used = RegsAvailable;
if (!includeReserved)
used |= ReservedRegs;
used.flip();
}
unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const {
@ -352,9 +352,9 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
// RegsAvailable, as RegsAvailable does not take aliases into account.
// That's what getRegsAvailable() is for.
BitVector Available = getRegsAvailable(RC);
if ((Candidates & Available).any())
Candidates &= Available;
Available &= Candidates;
if (Available.any())
Candidates = Available;
// Find the register whose use is furthest away.
MachineBasicBlock::iterator UseMI;