commit c59cd9bcd094683529f63fde55589454fa0f7ce1
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 dbaa045bcdd05eacba0a1a6513104e45b0224c7b
parent 4ab4f7f41649518a684ef340ccd77874fb56bc6e

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

llvm-svn: 77906

llvm/lib/CodeGen/MachineInstr.cpp

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 4ac2896..006a10a 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/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;
       }