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The scavenger should just use getAllocatableSet() rather than reinventing it

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locally.

llvm-svn: 112845
This commit is contained in:
Jim Grosbach 2010-09-02 18:29:04 +00:00
parent 7abb8df743
commit b35c81846b
1 changed files with 3 additions and 13 deletions
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16
lib/CodeGen/RegisterScavenging.cpp
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@ -228,14 +228,6 @@ void RegScavenger::getRegsUsed(BitVector &used, bool includeReserved) {
used = ~RegsAvailable & ~ReservedRegs;
}
/// CreateRegClassMask - Set the bits that represent the registers in the
/// TargetRegisterClass.
static void CreateRegClassMask(const TargetRegisterClass *RC, BitVector &Mask) {
for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end(); I != E;
++I)
Mask.set(*I);
}
unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const {
for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
I != E; ++I)
@ -330,11 +322,9 @@ unsigned RegScavenger::findSurvivorReg(MachineBasicBlock::iterator StartMI,
unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
MachineBasicBlock::iterator I,
int SPAdj) {
// Mask off the registers which are not in the TargetRegisterClass.
BitVector Candidates(NumPhysRegs, false);
CreateRegClassMask(RC, Candidates);
// Do not include reserved registers.
Candidates ^= ReservedRegs & Candidates;
// Consider all allocatable registers in the register class initially
BitVector Candidates =
TRI->getAllocatableSet(*I->getParent()->getParent(), RC);
// Exclude all the registers being used by the instruction.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {