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target-i386: Discard CC_OP computation in set_cc_op also

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The shift and rotate insns use movcond to set CC_OP, and thus
achieve a conditional EFLAGS setting.  By discarding CC_OP in
a later flags setting insn, we can discard that movcond.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-02-19 14:48:43 -08:00
parent 34d80a55ff
commit e2f515cf2f
1 changed files with 11 additions and 3 deletions
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14
target-i386/translate.c
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@ -239,10 +239,18 @@ static void set_cc_op(DisasContext *s, CCOp op)
tcg_gen_discard_tl(cpu_cc_srcT); tcg_gen_discard_tl(cpu_cc_srcT);
} }
if (op == CC_OP_DYNAMIC) {
/* The DYNAMIC setting is translator only, and should never be
stored. Thus we always consider it clean. */
s->cc_op_dirty = false;
} else {
/* Discard any computed CC_OP value (see shifts). */
if (s->cc_op == CC_OP_DYNAMIC) {
tcg_gen_discard_i32(cpu_cc_op);
}
s->cc_op_dirty = true;
}
s->cc_op = op; s->cc_op = op;
/* The DYNAMIC setting is translator only, and should never be
stored. Thus we always consider it clean. */
s->cc_op_dirty = (op != CC_OP_DYNAMIC);
} }
static void gen_update_cc_op(DisasContext *s) static void gen_update_cc_op(DisasContext *s)