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target-i386: use gen_op for cmps/scas 

Replace low-level ops with a higher-level "cmp %al, (A0)" in the case
of scas, and "cmp T0, (A0)" in the case of cmps.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-01-23 14:51:34 -08:00
parent 3b9d3cf160
commit 63633fe6eb
1 changed files with 6 additions and 14 deletions
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20
target-i386/translate.c
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@ -123,6 +123,7 @@ typedef struct DisasContext {
static void gen_eob(DisasContext *s);
static void gen_jmp(DisasContext *s, target_ulong eip);
static void gen_jmp_tb(DisasContext *s, target_ulong eip, int tb_num);
static void gen_op(DisasContext *s1, int op, int ot, int d);
/* i386 arith/logic operations */
enum {
@ -861,12 +862,6 @@ static void gen_op_update2_cc(void)
tcg_gen_mov_tl(cpu_cc_dst, cpu_T[0]);
}
static inline void gen_op_cmpl_T0_T1_cc(void)
{
tcg_gen_mov_tl(cpu_cc_src, cpu_T[1]);
tcg_gen_sub_tl(cpu_cc_dst, cpu_T[0], cpu_T[1]);
}
static inline void gen_op_testl_T0_T1_cc(void)
{
tcg_gen_and_tl(cpu_cc_dst, cpu_T[0], cpu_T[1]);
@ -1224,26 +1219,22 @@ static inline void gen_lods(DisasContext *s, int ot)
static inline void gen_scas(DisasContext *s, int ot)
{
gen_op_mov_TN_reg(OT_LONG, 0, R_EAX);
gen_string_movl_A0_EDI(s);
gen_op_ld_T1_A0(ot + s->mem_index);
gen_op_cmpl_T0_T1_cc();
gen_op(s, OP_CMPL, ot, R_EAX);
gen_op_movl_T0_Dshift(ot);
gen_op_add_reg_T0(s->aflag, R_EDI);
set_cc_op(s, CC_OP_SUBB + ot);
}
static inline void gen_cmps(DisasContext *s, int ot)
{
gen_string_movl_A0_ESI(s);
gen_op_ld_T0_A0(ot + s->mem_index);
gen_string_movl_A0_EDI(s);
gen_op_ld_T1_A0(ot + s->mem_index);
gen_op_cmpl_T0_T1_cc();
gen_string_movl_A0_ESI(s);
gen_op(s, OP_CMPL, ot, OR_TMP0);
gen_op_movl_T0_Dshift(ot);
gen_op_add_reg_T0(s->aflag, R_ESI);
gen_op_add_reg_T0(s->aflag, R_EDI);
set_cc_op(s, CC_OP_SUBB + ot);
}
static inline void gen_ins(DisasContext *s, int ot)
@ -1472,7 +1463,8 @@ static void gen_op(DisasContext *s1, int op, int ot, int d)
set_cc_op(s1, CC_OP_LOGICB + ot);
break;
case OP_CMPL:
gen_op_cmpl_T0_T1_cc();
tcg_gen_mov_tl(cpu_cc_src, cpu_T[1]);
tcg_gen_sub_tl(cpu_cc_dst, cpu_T[0], cpu_T[1]);
set_cc_op(s1, CC_OP_SUBB + ot);
break;
}