From: Paolo Bonzini <pbonz...@redhat.com>
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 <blauwir...@gmail.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
target-i386/translate.c | 48 ++++++++++++++++++++++++++++++++++++------------
1 file changed, 36 insertions(+), 12 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index 956765a..17e6c1a 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);
--
1.7.11.7
