Don't use MOV8rr_NOREX on x86-32. It doesn't actually hurt anything at

present, but it's inconsistent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69335 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index e123ae7..c024365 100644 (file)
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -1664,9 +1664,10 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
     } else if (DestRC == &X86::GR16RegClass) {
       Opc = X86::MOV16rr;
     } else if (DestRC == &X86::GR8RegClass) {
-      // Copying two or from a physical H register requires a NOREX move.
-      // Otherwise use a normal move.
-      if (isHReg(DestReg) || isHReg(SrcReg))
+      // Copying two or from a physical H register on x86-64 requires a NOREX
+      // move.  Otherwise use a normal move.
+      if ((isHReg(DestReg) || isHReg(SrcReg)) &&
+          TM.getSubtarget<X86Subtarget>().is64Bit())
         Opc = X86::MOV8rr_NOREX;
       else
         Opc = X86::MOV8rr;