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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>
This commit is contained in:
Paolo Bonzini 2012-10-05 18:42:59 +02:00 committed by Richard Henderson
parent 773cdfccb8
commit 1608ecca95
1 changed files with 36 additions and 12 deletions
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48
target-i386/translate.c
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@ -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);