diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-10-05 18:42:59 +0200 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-02-18 15:03:56 -0800 |
| commit | 1608ecca95188dcf4f78072be48f41dbe2062b25 (patch) | |
| tree | f015370d95c5faa906d455cc74f1e5fe88941ed1 | |
| parent | 773cdfccb835cc82aca2b2ff34277b4bf58d6bb9 (diff) | |
target-i386: add helper functions to get other flags
Introduce new functions to extract PF, SF, OF, ZF in addition to CF.
These provide single entry points for optimizing accesses to a single
flag.
Reviewed-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
| -rw-r--r-- | target-i386/translate.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 9dd3081a8f..9bbe969cd6 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -857,21 +857,49 @@ static void gen_compute_eflags(DisasContext *s, TCGv reg) tcg_gen_extu_i32_tl(reg, cpu_tmp2_i32); } +/* compute eflags.P to reg */ +static void gen_compute_eflags_p(DisasContext *s, TCGv reg) +{ + gen_compute_eflags(s, reg); + tcg_gen_shri_tl(reg, reg, 2); + tcg_gen_andi_tl(reg, reg, 1); +} + +/* compute eflags.S to reg */ +static void gen_compute_eflags_s(DisasContext *s, TCGv reg) +{ + gen_compute_eflags(s, reg); + tcg_gen_shri_tl(reg, reg, 7); + tcg_gen_andi_tl(reg, reg, 1); +} + +/* compute eflags.O to reg */ +static void gen_compute_eflags_o(DisasContext *s, TCGv reg) +{ + gen_compute_eflags(s, reg); + tcg_gen_shri_tl(reg, reg, 11); + tcg_gen_andi_tl(reg, reg, 1); +} + +/* compute eflags.Z to reg */ +static void gen_compute_eflags_z(DisasContext *s, TCGv reg) +{ + gen_compute_eflags(s, reg); + tcg_gen_shri_tl(reg, reg, 6); + tcg_gen_andi_tl(reg, reg, 1); +} + static inline void gen_setcc_slow_T0(DisasContext *s, int jcc_op) { switch(jcc_op) { case JCC_O: - gen_compute_eflags(s, cpu_T[0]); - tcg_gen_shri_tl(cpu_T[0], cpu_T[0], 11); - tcg_gen_andi_tl(cpu_T[0], cpu_T[0], 1); + gen_compute_eflags_o(s, cpu_T[0]); break; case JCC_B: gen_compute_eflags_c(s, cpu_T[0]); break; case JCC_Z: - gen_compute_eflags(s, cpu_T[0]); - tcg_gen_shri_tl(cpu_T[0], cpu_T[0], 6); - tcg_gen_andi_tl(cpu_T[0], cpu_T[0], 1); + gen_compute_eflags_z(s, cpu_T[0]); break; case JCC_BE: gen_compute_eflags(s, cpu_tmp0); @@ -880,14 +908,10 @@ static inline void gen_setcc_slow_T0(DisasContext *s, int jcc_op) tcg_gen_andi_tl(cpu_T[0], cpu_T[0], 1); break; case JCC_S: - gen_compute_eflags(s, cpu_T[0]); - tcg_gen_shri_tl(cpu_T[0], cpu_T[0], 7); - tcg_gen_andi_tl(cpu_T[0], cpu_T[0], 1); + gen_compute_eflags_s(s, cpu_T[0]); break; case JCC_P: - gen_compute_eflags(s, cpu_T[0]); - tcg_gen_shri_tl(cpu_T[0], cpu_T[0], 2); - tcg_gen_andi_tl(cpu_T[0], cpu_T[0], 1); + gen_compute_eflags_p(s, cpu_T[0]); break; case JCC_L: gen_compute_eflags(s, cpu_tmp0); |