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lastRegisterUse() should ignore identity copies. Those will be erased.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48759 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-03-25 02:02:19 +00:00
parent d804f8ff70
commit a2fb634def
2 changed files with 44 additions and 7 deletions
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21
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@@ -1541,6 +1541,10 @@ SimpleRegisterCoalescing::lastRegisterUse(unsigned Start, unsigned End,
E = mri_->use_end(); I != E; ++I) {
MachineOperand &Use = I.getOperand();
MachineInstr *UseMI = Use.getParent();
unsigned SrcReg, DstReg;
if (tii_->isMoveInstr(*UseMI, SrcReg, DstReg) && SrcReg == DstReg)
// Ignore identity copies.
continue;
unsigned Idx = li_->getInstructionIndex(UseMI);
if (Idx >= Start && Idx < End && Idx >= UseIdx) {
LastUse = &Use;
@@ -1562,14 +1566,17 @@ SimpleRegisterCoalescing::lastRegisterUse(unsigned Start, unsigned End,
if (e < s || MI == NULL)
return NULL;
for (unsigned i = 0, NumOps = MI->getNumOperands(); i != NumOps; ++i) {
MachineOperand &Use = MI->getOperand(i);
if (Use.isRegister() && Use.isUse() && Use.getReg() &&
tri_->regsOverlap(Use.getReg(), Reg)) {
UseIdx = e;
return &Use;
// Ignore identity copies.
unsigned SrcReg, DstReg;
if (!(tii_->isMoveInstr(*MI, SrcReg, DstReg) && SrcReg == DstReg))
for (unsigned i = 0, NumOps = MI->getNumOperands(); i != NumOps; ++i) {
MachineOperand &Use = MI->getOperand(i);
if (Use.isRegister() && Use.isUse() && Use.getReg() &&
tri_->regsOverlap(Use.getReg(), Reg)) {
UseIdx = e;
return &Use;
}
}
}
e -= InstrSlots::NUM;
}