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>

target-i386/translate.c

@@ -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;
     }