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Delete a dead variable.

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TwoAddressInstructionPass doesn't remat any more.

llvm-svn: 161285
This commit is contained in:
Jakob Stoklund Olesen 2012-08-04 00:04:03 +00:00
parent 69611c470c
commit d5b3babd6f
1 changed files with 0 additions and 12 deletions
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12
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1387,9 +1387,6 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &Func) {
// This pass takes the function out of SSA form.
MRI->leaveSSA();
// ReMatRegs - Keep track of the registers whose def's are remat'ed.
BitVector ReMatRegs(MRI->getNumVirtRegs());
TiedOperandMap TiedOperands;
SmallPtrSet<MachineInstr*, 8> Processed;
@ -1478,15 +1475,6 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &Func) {
}
}
// Some remat'ed instructions are dead.
for (int i = ReMatRegs.find_first(); i != -1; i = ReMatRegs.find_next(i)) {
unsigned VReg = TargetRegisterInfo::index2VirtReg(i);
if (MRI->use_nodbg_empty(VReg)) {
MachineInstr *DefMI = MRI->getVRegDef(VReg);
DefMI->eraseFromParent();
}
}
// Eliminate REG_SEQUENCE instructions. Their whole purpose was to preseve
// SSA form. It's now safe to de-SSA.
MadeChange |= EliminateRegSequences();