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Revert "Remove references to INSERT_SUBREG after de-SSA" r107725.

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Buildbot breakage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107744 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-07-07 00:32:25 +00:00
parent 78dfbc380d
commit 4b76ffc1ff
7 changed files with 136 additions and 9 deletions
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lib/CodeGen/ProcessImplicitDefs.cpp
+15
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@@ -102,6 +102,21 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
continue;
}
if (MI->isInsertSubreg()) {
MachineOperand &MO = MI->getOperand(2);
if (ImpDefRegs.count(MO.getReg())) {
// %reg1032<def> = INSERT_SUBREG %reg1032, undef, 2
// This is an identity copy, eliminate it now.
if (MO.isKill()) {
LiveVariables::VarInfo& vi = lv_->getVarInfo(MO.getReg());
vi.removeKill(MI);
}
MI->eraseFromParent();
Changed = true;
continue;
}
}
// Eliminate %reg1032:sub<def> = COPY undef.
if (MI->isCopy() && MI->getOperand(0).getSubReg()) {
MachineOperand &MO = MI->getOperand(1);