From 1e76e65007ecabb905cc8e51f74db1cb87fb4067 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 15 Apr 2009 00:00:48 +0000
Subject: [PATCH] GR8_NOREX can contain the H registers, since they don't
 require REX prefixes.

llvm-svn: 69108
---
 lib/Target/X86/X86RegisterInfo.td | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Target/X86/X86RegisterInfo.td b/lib/Target/X86/X86RegisterInfo.td
index f4e0cb7fd13..7137f6b88a7 100644
--- a/lib/Target/X86/X86RegisterInfo.td
+++ b/lib/Target/X86/X86RegisterInfo.td
@@ -483,7 +483,8 @@ def GR64_ : RegisterClass<"X86", [i64], 64, [RAX, RCX, RDX, RBX]> {
 // On x86-64, GR64_NOREX, GR32_NOREX and GR16_NOREX are the classes
 // of registers which do not by themselves require a REX prefix.
 def GR8_NOREX : RegisterClass<"X86", [i8], 8,
-                              [AL, CL, DL, SIL, DIL, BL, BPL, SPL]> {
+                              [AL, CL, DL, BL, AH, CH, DH, BH,
+                               SIL, DIL, BPL, SPL]> {
   let MethodProtos = [{
     iterator allocation_order_begin(const MachineFunction &MF) const;
     iterator allocation_order_end(const MachineFunction &MF) const;
@@ -500,7 +501,7 @@ def GR8_NOREX : RegisterClass<"X86", [i8], 8,
     };
     // In 32-mode, none of the 8-bit registers aliases EBP or ESP.
     static const unsigned X86_GR8_NOREX_AO_32[] = {
-      X86::AL, X86::CL, X86::DL, X86::BL
+      X86::AL, X86::CL, X86::DL, X86::AH, X86::CH, X86::DH, X86::BL, X86::BH
     };
 
     GR8_NOREXClass::iterator