Ensure all defs referring to a virtual register are marked dead by addRegisterDead().
There can be multiple defs for a single virtual register when they are defining
sub-registers.
The missing <dead> flag was stopping the inline spiller from eliminating dead
code after rematerialization.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index dce05d3..0d137eb 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1543,13 +1543,8 @@
continue;
if (Reg == IncomingReg) {
- if (!Found) {
- if (MO.isDead())
- // The register is already marked dead.
- return true;
- MO.setIsDead();
- Found = true;
- }
+ MO.setIsDead();
+ Found = true;
} else if (hasAliases && MO.isDead() &&
TargetRegisterInfo::isPhysicalRegister(Reg)) {
// There exists a super-register that's marked dead.