When all defs of a vr are implicit_def, delete all of the defs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89905 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp
index a484bec..c9a33d8 100644
--- a/lib/CodeGen/ProcessImplicitDefs.cpp
+++ b/lib/CodeGen/ProcessImplicitDefs.cpp
@@ -183,19 +183,23 @@
// is not an implicit_def, do not insert implicit_def's before the
// uses.
bool Skip = false;
+ SmallVector<MachineInstr*, 4> DeadImpDefs;
for (MachineRegisterInfo::def_iterator DI = mri_->def_begin(Reg),
DE = mri_->def_end(); DI != DE; ++DI) {
- if (DI->getOpcode() != TargetInstrInfo::IMPLICIT_DEF) {
+ MachineInstr *DeadImpDef = &*DI;
+ if (DeadImpDef->getOpcode() != TargetInstrInfo::IMPLICIT_DEF) {
Skip = true;
break;
}
+ DeadImpDefs.push_back(DeadImpDef);
}
if (Skip)
continue;
// The only implicit_def which we want to keep are those that are live
// out of its block.
- MI->eraseFromParent();
+ for (unsigned j = 0, ee = DeadImpDefs.size(); j != ee; ++j)
+ DeadImpDefs[j]->eraseFromParent();
Changed = true;
// Process each use instruction once.