Add <imp-def> of super-register when lowering SUBREG_TO_REG.
Patch by Tyler Nowicki!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ExpandPostRAPseudos.cpp b/lib/CodeGen/ExpandPostRAPseudos.cpp
index b14afc2..7a17331 100644
--- a/lib/CodeGen/ExpandPostRAPseudos.cpp
+++ b/lib/CodeGen/ExpandPostRAPseudos.cpp
@@ -131,13 +131,16 @@
} else {
TII->copyPhysReg(*MBB, MI, MI->getDebugLoc(), DstSubReg, InsReg,
MI->getOperand(2).isKill());
+
+ // Implicitly define DstReg for subsequent uses.
+ MachineBasicBlock::iterator CopyMI = MI;
+ --CopyMI;
+ CopyMI->addRegisterDefined(DstReg);
+
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstSubReg, TRI);
- DEBUG({
- MachineBasicBlock::iterator dMI = MI;
- dbgs() << "subreg: " << *(--dMI);
- });
+ DEBUG(dbgs() << "subreg: " << *CopyMI);
}
DEBUG(dbgs() << '\n');