From: Aurelien Jarno <aurelien@aurel32.net>
Date: Sun, 27 Sep 2009 16:08:16 +0000 (+0200)
Subject: tcg/x86_64: generated dec/inc instead of sub/add when possible
X-Git-Tag: TizenStudio_2.0_p2.3~7383
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b78ae47b40c21d4180cb97cc84d8ad7d4ba90c77;p=sdk%2Femulator%2Fqemu.git

tcg/x86_64: generated dec/inc instead of sub/add when possible

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/tcg/x86_64/tcg-target.c b/tcg/x86_64/tcg-target.c
index 9709430..b4ba65f 100644
--- a/tcg/x86_64/tcg-target.c
+++ b/tcg/x86_64/tcg-target.c
@@ -397,7 +397,13 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, int arg,
 
 static inline void tgen_arithi32(TCGContext *s, int c, int r0, int32_t val)
 {
-    if (val == (int8_t)val) {
+    if ((c == ARITH_ADD && val == 1) || (c == ARITH_SUB && val == -1)) {
+        /* inc */
+        tcg_out_modrm(s, 0xff, 0, r0);
+    } else if ((c == ARITH_ADD && val == -1) || (c == ARITH_SUB && val == 1)) {
+        /* dec */
+        tcg_out_modrm(s, 0xff, 1, r0);
+    } else if (val == (int8_t)val) {
         tcg_out_modrm(s, 0x83, c, r0);
         tcg_out8(s, val);
     } else if (c == ARITH_AND && val == 0xffu) {
@@ -414,7 +420,13 @@ static inline void tgen_arithi32(TCGContext *s, int c, int r0, int32_t val)
 
 static inline void tgen_arithi64(TCGContext *s, int c, int r0, int64_t val)
 {
-    if (val == (int8_t)val) {
+    if ((c == ARITH_ADD && val == 1) || (c == ARITH_SUB && val == -1)) {
+        /* inc */
+        tcg_out_modrm(s, 0xff | P_REXW, 0, r0);
+    } else if ((c == ARITH_ADD && val == -1) || (c == ARITH_SUB && val == 1)) {
+        /* dec */
+        tcg_out_modrm(s, 0xff | P_REXW, 1, r0);
+    } else 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) {