Revert "Remove references to INSERT_SUBREG after de-SSA" r107725.
Buildbot breakage.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107744 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp
index 2caef08..80121ca 100644
--- a/lib/CodeGen/ProcessImplicitDefs.cpp
+++ b/lib/CodeGen/ProcessImplicitDefs.cpp
@@ -102,6 +102,21 @@
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);