mirror of https://github.com/proxmox/mirror_qemu
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
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b666265b20
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086c407784
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@ -900,9 +900,22 @@ static void gen_compute_eflags_p(DisasContext *s, TCGv reg)
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/* compute eflags.S to reg */
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static void gen_compute_eflags_s(DisasContext *s, TCGv reg)
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{
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gen_compute_eflags(s);
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tcg_gen_shri_tl(reg, cpu_cc_src, 7);
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tcg_gen_andi_tl(reg, reg, 1);
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switch (s->cc_op) {
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case CC_OP_DYNAMIC:
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gen_compute_eflags(s);
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/* FALLTHRU */
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case CC_OP_EFLAGS:
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tcg_gen_shri_tl(reg, cpu_cc_src, 7);
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tcg_gen_andi_tl(reg, reg, 1);
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break;
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default:
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{
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int size = (s->cc_op - CC_OP_ADDB) & 3;
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TCGv t0 = gen_ext_tl(reg, cpu_cc_dst, size, true);
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tcg_gen_setcondi_tl(TCG_COND_LT, reg, t0, 0);
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}
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break;
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}
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}
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/* compute eflags.O to reg */
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@ -916,9 +929,21 @@ static void gen_compute_eflags_o(DisasContext *s, TCGv reg)
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/* compute eflags.Z to reg */
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static void gen_compute_eflags_z(DisasContext *s, TCGv reg)
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{
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gen_compute_eflags(s);
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tcg_gen_shri_tl(reg, cpu_cc_src, 6);
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tcg_gen_andi_tl(reg, reg, 1);
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switch (s->cc_op) {
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case CC_OP_DYNAMIC:
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gen_compute_eflags(s);
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/* FALLTHRU */
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case CC_OP_EFLAGS:
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tcg_gen_shri_tl(reg, cpu_cc_src, 6);
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tcg_gen_andi_tl(reg, reg, 1);
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break;
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default:
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{
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int size = (s->cc_op - CC_OP_ADDB) & 3;
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TCGv t0 = gen_ext_tl(reg, cpu_cc_dst, size, false);
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tcg_gen_setcondi_tl(TCG_COND_EQ, reg, t0, 0);
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}
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}
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}
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static inline void gen_setcc_slow_T0(DisasContext *s, int jcc_op)
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