From patchwork Sat Oct 6 12:30:14 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [07/14] i386: add helper functions to get other flags Date: Sat, 06 Oct 2012 02:30:14 -0000 From: Paolo Bonzini X-Patchwork-Id: 189691 Message-Id: <1349526621-13939-8-git-send-email-pbonzini@redhat.com> To: qemu-devel@nongnu.org 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. Signed-off-by: Paolo Bonzini Reviewed-by: Blue Swirl Reviewed-by: Richard Henderson --- target-i386/translate.c | 48 ++++++++++++++++++++++++++++++++++++------------ 1 file modificato, 36 inserzioni(+), 12 rimozioni(-) diff --git a/target-i386/translate.c b/target-i386/translate.c index df81b78..8f22119 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -847,21 +847,49 @@ 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); @@ -870,14 +898,10 @@ 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);