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| author |   Aurelien Jarno <aurelien@aurel32.net> | 2009-09-27 18:08:16 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2009-09-27 18:08:16 +0200 |
| commit | a4b18c6ddbc9135f86f8b93806f7f5198ed90674 (patch) | |
| tree | 00f7a14e51401085fec400fff0fa79f67eebb8c4 /tcg/x86_64 | |
| parent | Don't compile roms if not building system targets (diff) | |
| download | qemu-kvm-a4b18c6ddbc9135f86f8b93806f7f5198ed90674.tar.gz qemu-kvm-a4b18c6ddbc9135f86f8b93806f7f5198ed90674.tar.bz2 qemu-kvm-a4b18c6ddbc9135f86f8b93806f7f5198ed90674.zip | |
tcg/x86_64: generated dec/inc instead of sub/add when possible
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/x86_64')
| -rw-r--r-- | tcg/x86_64/tcg-target.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/tcg/x86_64/tcg-target.c b/tcg/x86_64/tcg-target.c index 9709430c6..b4ba65f97 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) { |