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From: Paul Brook <paul@nowt.org>
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Date: Sun, 07 Sep 2008 18:07:39 +0000
Subject: [Qemu-devel] [5180] TCG: Use x86-64 zero extension instructions.
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Revision: 5180
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5180
Author:   pbrook
Date:     2008-09-07 18:07:39 +0000 (Sun, 07 Sep 2008)

Log Message:
-----------
TCG: Use x86-64 zero extension instructions.

Signed-off-by: Paul Brook <paul@codesourcery.com>

Modified Paths:
--------------
    trunk/tcg/x86_64/tcg-target.c

Modified: trunk/tcg/x86_64/tcg-target.c
===================================================================
--- trunk/tcg/x86_64/tcg-target.c	2008-09-07 17:45:15 UTC (rev 5179)
+++ trunk/tcg/x86_64/tcg-target.c	2008-09-07 18:07:39 UTC (rev 5180)
@@ -382,6 +382,12 @@
     if (val == (int8_t)val) {
         tcg_out_modrm(s, 0x83, c, r0);
         tcg_out8(s, val);
+    } else if (c == ARITH_AND && val == 0xffu) {
+        /* movzbl */
+        tcg_out_modrm(s, 0xb6 | P_EXT | P_REXB, r0, r0);
+    } else if (c == ARITH_AND && val == 0xffffu) {
+        /* movzwl */
+        tcg_out_modrm(s, 0xb7 | P_EXT, r0, r0);
     } else {
         tcg_out_modrm(s, 0x81, c, r0);
         tcg_out32(s, val);
@@ -393,6 +399,15 @@
     if (val == (int8_t)val) {
         tcg_out_modrm(s, 0x83 | P_REXW, c, r0);
         tcg_out8(s, val);
+    } else if (c == ARITH_AND && val == 0xffu) {
+        /* movzbl */
+        tcg_out_modrm(s, 0xb6 | P_EXT | P_REXW, r0, r0);
+    } else if (c == ARITH_AND && val == 0xffffu) {
+        /* movzwl */
+        tcg_out_modrm(s, 0xb7 | P_EXT | P_REXW, r0, r0);
+    } else if (c == ARITH_AND && val == 0xffffffffu) {
+        /* 32-bit mov zero extends */
+        tcg_out_modrm(s, 0x8b, r0, r0);
     } else if (val == (int32_t)val) {
         tcg_out_modrm(s, 0x81 | P_REXW, c, r0);
         tcg_out32(s, val);