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target-i386: Update cc_op before TCG branches

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Placing the CC_OP_DYNAMIC at the join is less effective than
before the branch, as the branch will have forced global registers
to their home locations.  This way we have a chance to discard
CC_SRC2 before it gets stored.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-01-18 10:06:55 -08:00
parent dc259201f8
commit 891a5133f1
1 changed files with 4 additions and 4 deletions
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8
target-i386/translate.c
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@ -1559,8 +1559,9 @@ static void gen_shift_rm_T1(DisasContext *s, int ot, int op1,
gen_op_mov_reg_T0(ot, op1);
}
/* update eflags */
/* Update eflags data because we cannot predict flags afterward. */
gen_update_cc_op(s);
set_cc_op(s, CC_OP_DYNAMIC);
tcg_gen_mov_tl(t1, cpu_T[0]);
@ -1587,7 +1588,6 @@ static void gen_shift_rm_T1(DisasContext *s, int ot, int op1,
}
gen_set_label(shift_label);
set_cc_op(s, CC_OP_DYNAMIC); /* cannot predict flags after */
tcg_temp_free(t0);
tcg_temp_free(t1);
@ -1972,8 +1972,9 @@ static void gen_shiftd_rm_T1(DisasContext *s, int ot, int op1,
gen_op_mov_reg_v(ot, op1, t0);
}
/* update eflags */
/* Update eflags data because we cannot predict flags afterward. */
gen_update_cc_op(s);
set_cc_op(s, CC_OP_DYNAMIC);
label2 = gen_new_label();
tcg_gen_brcondi_tl(TCG_COND_EQ, t2, 0, label2);
@ -1986,7 +1987,6 @@ static void gen_shiftd_rm_T1(DisasContext *s, int ot, int op1,
tcg_gen_movi_i32(cpu_cc_op, CC_OP_SHLB + ot);
}
gen_set_label(label2);
set_cc_op(s, CC_OP_DYNAMIC); /* cannot predict flags after */
tcg_temp_free(t0);
tcg_temp_free(t1);