Mark all uses as <undef> when joining a copy.
This way, shrinkToUses() will ignore the instruction that is about to be
deleted, and we avoid leaving invalid live ranges that SplitKit doesn't like.
Fix a misunderstanding in MachineVerifier about <def,undef> operands. The
<undef> flag is valid on def operands where it has the same meaning as <undef>
on a use operand. It only applies to sub-register defines which also read the
full register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128642 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineVerifier.cpp b/lib/CodeGen/MachineVerifier.cpp
index 7351119..e78ca9b 100644
--- a/lib/CodeGen/MachineVerifier.cpp
+++ b/lib/CodeGen/MachineVerifier.cpp
@@ -602,9 +602,7 @@
// Check Live Variables.
if (MI->isDebugValue()) {
// Liveness checks are not valid for debug values.
- } else if (MO->isUndef()) {
- // An <undef> doesn't refer to any register, so just skip it.
- } else if (MO->isUse()) {
+ } else if (MO->isUse() && !MO->isUndef()) {
regsLiveInButUnused.erase(Reg);
bool isKill = false;
@@ -675,8 +673,7 @@
MInfo.vregsLiveIn.insert(std::make_pair(Reg, MI));
}
}
- } else {
- assert(MO->isDef());
+ } else if (MO->isDef()) {
// Register defined.
// TODO: verify that earlyclobber ops are not used.
if (MO->isDead())