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Add support for register masks to PBQP.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2012-03-23 17:33:42 +00:00
parent 81bbdfda82
commit f1113ef452
1 changed files with 38 additions and 4 deletions
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42
lib/CodeGen/RegAllocPBQP.cpp
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@ -187,7 +187,7 @@ std::auto_ptr<PBQPRAProblem> PBQPBuilder::build(MachineFunction *mf,
const RegSet &vregs) {
typedef std::vector<const LiveInterval*> LIVector;
ArrayRef<SlotIndex> regMaskSlots = lis->getRegMaskSlots();
MachineRegisterInfo *mri = &mf->getRegInfo();
const TargetRegisterInfo *tri = mf->getTarget().getRegisterInfo();
@ -224,7 +224,9 @@ std::auto_ptr<PBQPRAProblem> PBQPBuilder::build(MachineFunction *mf,
}
}
// Remove any physical registers which overlap.
RegSet overlappingPRegs;
// Record physical registers whose ranges overlap.
for (RegSet::const_iterator pregItr = pregs.begin(),
pregEnd = pregs.end();
pregItr != pregEnd; ++pregItr) {
@ -235,9 +237,41 @@ std::auto_ptr<PBQPRAProblem> PBQPBuilder::build(MachineFunction *mf,
continue;
}
if (!vregLI->overlaps(*pregLI)) {
continue;
if (vregLI->overlaps(*pregLI))
overlappingPRegs.insert(preg);
}
// Record any overlaps with regmask operands.
BitVector regMaskOverlaps(tri->getNumRegs());
for (ArrayRef<SlotIndex>::iterator rmItr = regMaskSlots.begin(),
rmEnd = regMaskSlots.end();
rmItr != rmEnd; ++rmItr) {
SlotIndex rmIdx = *rmItr;
if (vregLI->liveAt(rmIdx)) {
MachineInstr *rmMI = lis->getInstructionFromIndex(rmIdx);
const uint32_t* regMask = 0;
for (MachineInstr::mop_iterator mopItr = rmMI->operands_begin(),
mopEnd = rmMI->operands_end();
mopItr != mopEnd; ++mopItr) {
if (mopItr->isRegMask()) {
regMask = mopItr->getRegMask();
break;
}
}
assert(regMask != 0 && "Couldn't find register mask.");
regMaskOverlaps.setBitsNotInMask(regMask);
}
}
for (unsigned preg = 0; preg < tri->getNumRegs(); ++preg) {
if (regMaskOverlaps.test(preg))
overlappingPRegs.insert(preg);
}
for (RegSet::const_iterator pregItr = overlappingPRegs.begin(),
pregEnd = overlappingPRegs.end();
pregItr != pregEnd; ++pregItr) {
unsigned preg = *pregItr;
// Remove the register from the allowed set.
VRAllowed::iterator eraseItr =