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Use MRI::isConstantPhysReg() to check remat feasibility.

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Don't depend on LiveIntervals::hasInterval() to determine if a physreg
is reserved and constant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159013 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-06-22 17:31:01 +00:00
parent 35ac4b0c45
commit 834a9cdbb7
1 changed files with 8 additions and 4 deletions
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12
lib/CodeGen/LiveRangeEdit.cpp
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@ -82,12 +82,16 @@ bool LiveRangeEdit::allUsesAvailableAt(const MachineInstr *OrigMI,
UseIdx = UseIdx.getRegSlot(true);
for (unsigned i = 0, e = OrigMI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = OrigMI->getOperand(i);
if (!MO.isReg() || !MO.getReg() || MO.isDef())
continue;
// Reserved registers are OK.
if (MO.isUndef() || !LIS.hasInterval(MO.getReg()))
if (!MO.isReg() || !MO.getReg() || !MO.readsReg())
continue;
// We can't remat physreg uses, unless it is a constant.
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
if (MRI.isConstantPhysReg(MO.getReg(), VRM->getMachineFunction()))
continue;
return false;
}
LiveInterval &li = LIS.getInterval(MO.getReg());
const VNInfo *OVNI = li.getVNInfoAt(OrigIdx);
if (!OVNI)