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Move kill flags when the same register occurs more than once in a sequence.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2009-12-23 21:34:03 +00:00
parent 158a2263bd
commit 1dbc38f52e
1 changed files with 22 additions and 1 deletions
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23
lib/Target/ARM/ARMLoadStoreOptimizer.cpp
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@ -282,9 +282,22 @@ MergeOpsUpdate(MachineBasicBlock &MBB,
// First calculate which of the registers should be killed by the merged
// instruction.
SmallVector<std::pair<unsigned, bool>, 8> Regs;
const unsigned insertPos = memOps[insertAfter].Position;
for (unsigned i = memOpsBegin; i < memOpsEnd; ++i) {
const MachineOperand &MO = memOps[i].MBBI->getOperand(0);
Regs.push_back(std::make_pair(MO.getReg(), MO.isKill()));
unsigned Reg = MO.getReg();
bool isKill = MO.isKill();
// If we are inserting the merged operation after an unmerged operation that
// uses the same register, make sure to transfer any kill flag.
for (unsigned j = memOpsEnd, e = memOps.size(); !isKill && j != e; ++j)
if (memOps[j].Position<insertPos) {
const MachineOperand &MOJ = memOps[j].MBBI->getOperand(0);
if (MOJ.getReg() == Reg && MOJ.isKill())
isKill = true;
}
Regs.push_back(std::make_pair(Reg, isKill));
}
// Try to do the merge.
@ -297,6 +310,14 @@ MergeOpsUpdate(MachineBasicBlock &MBB,
// Merge succeeded, update records.
Merges.push_back(prior(Loc));
for (unsigned i = memOpsBegin; i < memOpsEnd; ++i) {
// Remove kill flags from any unmerged memops that come before insertPos.
if (Regs[i-memOpsBegin].second)
for (unsigned j = memOpsEnd, e = memOps.size(); j != e; ++j)
if (memOps[j].Position<insertPos) {
MachineOperand &MOJ = memOps[j].MBBI->getOperand(0);
if (MOJ.getReg() == Regs[i-memOpsBegin].first && MOJ.isKill())
MOJ.setIsKill(false);
}
MBB.erase(memOps[i].MBBI);
memOps[i].Merged = true;
}