Add proper register aliases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75999 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index c82aa0b9b4..92418ac11f 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -149,8 +149,6 @@ bool
 SystemZInstrInfo::isMoveInstr(const MachineInstr& MI,
                               unsigned &SrcReg, unsigned &DstReg,
                               unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
-  SrcSubIdx = DstSubIdx = 0; // No sub-registers yet.
-
   switch (MI.getOpcode()) {
   default:
     return false;
@@ -164,6 +162,8 @@ SystemZInstrInfo::isMoveInstr(const MachineInstr& MI,
            "invalid register-register move instruction");
     SrcReg = MI.getOperand(1).getReg();
     DstReg = MI.getOperand(0).getReg();
+    SrcSubIdx = MI.getOperand(1).getSubReg();
+    DstSubIdx = MI.getOperand(0).getSubReg();
     return true;
   }
 }