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target-i386: do not call helper to compute ZF/SF 

ZF, SF and PF can always be computed from CC_DST except in the
CC_OP_EFLAGS case (and CC_OP_DYNAMIC, which just resolves to CC_OP_EFLAGS
in gen_compute_eflags).  Use setcond to compute ZF and SF.

We could also use a table lookup to compute PF.

Reviewed-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
master
Richard Henderson 2013-01-23 13:33:59 -08:00
parent b666265b20
commit 086c407784
1 changed files with 31 additions and 6 deletions
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37
target-i386/translate.c
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@ -900,9 +900,22 @@ static void gen_compute_eflags_p(DisasContext *s, TCGv reg)
/* compute eflags.S to reg */
static void gen_compute_eflags_s(DisasContext *s, TCGv reg)
{
gen_compute_eflags(s);
tcg_gen_shri_tl(reg, cpu_cc_src, 7);
tcg_gen_andi_tl(reg, reg, 1);
switch (s->cc_op) {
case CC_OP_DYNAMIC:
gen_compute_eflags(s);
/* FALLTHRU */
case CC_OP_EFLAGS:
tcg_gen_shri_tl(reg, cpu_cc_src, 7);
tcg_gen_andi_tl(reg, reg, 1);
break;
default:
{
int size = (s->cc_op - CC_OP_ADDB) & 3;
TCGv t0 = gen_ext_tl(reg, cpu_cc_dst, size, true);
tcg_gen_setcondi_tl(TCG_COND_LT, reg, t0, 0);
}
break;
}
}
/* compute eflags.O to reg */
@ -916,9 +929,21 @@ static void gen_compute_eflags_o(DisasContext *s, TCGv reg)
/* compute eflags.Z to reg */
static void gen_compute_eflags_z(DisasContext *s, TCGv reg)
{
gen_compute_eflags(s);
tcg_gen_shri_tl(reg, cpu_cc_src, 6);
tcg_gen_andi_tl(reg, reg, 1);
switch (s->cc_op) {
case CC_OP_DYNAMIC:
gen_compute_eflags(s);
/* FALLTHRU */
case CC_OP_EFLAGS:
tcg_gen_shri_tl(reg, cpu_cc_src, 6);
tcg_gen_andi_tl(reg, reg, 1);
break;
default:
{
int size = (s->cc_op - CC_OP_ADDB) & 3;
TCGv t0 = gen_ext_tl(reg, cpu_cc_dst, size, false);
tcg_gen_setcondi_tl(TCG_COND_EQ, reg, t0, 0);
}
}
}
static inline void gen_setcc_slow_T0(DisasContext *s, int jcc_op)