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

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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2009-09-27 18:08:16 +02:00
parent b461cdc9b3
commit a4b18c6ddb
1 changed files with 14 additions and 2 deletions
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16
tcg/x86_64/tcg-target.c
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@ -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) {