commit ece48185168ab130b1777feb86d9e3fe80eb87d2
author Jakob Stoklund Olesen <stoklund@2pi.dk> Sun Aug 02 19:13:03 2009 +0000
committer Jakob Stoklund Olesen <stoklund@2pi.dk> Sun Aug 02 19:13:03 2009 +0000
tree 3c38310f836b8a609d7cee4771b50b98227bbf5f
parent 0e6a4efdd4f97137fb0a58d7bb3de07562185530

Never add a kill flag to a constrained physical register in a two-addr instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77906 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineInstr.cpp

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 4ac2896..006a10a 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1041,6 +1041,9 @@
         if (MO.isKill())
           // The register is already marked kill.
           return true;
+        if (isPhysReg && isRegTiedToDefOperand(i))
+          // Two-address uses of physregs must not be marked kill.
+          return true;
         MO.setIsKill();
         Found = true;
       }