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[Qemu-devel] [5180] TCG: Use x86-64 zero extension instructions.
From: |
Paul Brook |
Subject: |
[Qemu-devel] [5180] TCG: Use x86-64 zero extension instructions. |
Date: |
Sun, 07 Sep 2008 18:07:39 +0000 |
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 <address@hidden>
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);
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