- Change MachineInstr::findRegisterDefOperandIdx so it can also look for defs

that are aliases of the specified register.
- Rename modifiesRegister to definesRegister since it's looking a def of the
specific register or one of its super-registers. It's not looking for def of a
sub-register or alias that could change the specified register.
- Added modifiesRegister to look for defs of aliases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104377 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index f95ac10494..93f0cb0f15 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -626,7 +626,8 @@ SimpleRegisterCoalescing::TrimLiveIntervalToLastUse(SlotIndex CopyIdx,
     if (tii_->isMoveInstr(*LastUseMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
         DstReg == li.reg && DstSubIdx == 0) {
       // Last use is itself an identity code.
-      int DeadIdx = LastUseMI->findRegisterDefOperandIdx(li.reg, false, tri_);
+      int DeadIdx = LastUseMI->findRegisterDefOperandIdx(li.reg,
+                                                         false, false, tri_);
       LastUseMI->getOperand(DeadIdx).setIsDead();
     }
     return true;
@@ -949,7 +950,7 @@ static void PropagateDeadness(LiveInterval &li, MachineInstr *CopyMI,
   MachineInstr *DefMI =
     li_->getInstructionFromIndex(LRStart.getDefIndex());
   if (DefMI && DefMI != CopyMI) {
-    int DeadIdx = DefMI->findRegisterDefOperandIdx(li.reg, false);
+    int DeadIdx = DefMI->findRegisterDefOperandIdx(li.reg);
     if (DeadIdx != -1)
       DefMI->getOperand(DeadIdx).setIsDead();
     else