diff --git a/target-sh4/helper.h b/target-sh4/helper.h
index d498719f18daa1f4084e79d2c080a5c96c0b56af..92d6dd7656764e57b30f889cb986385dd0b2ce99 100644
--- a/target-sh4/helper.h
+++ b/target-sh4/helper.h
@@ -14,9 +14,7 @@ DEF_HELPER_1(discard_movcal_backup, void, env)
 DEF_HELPER_2(ocbi, void, env, i32)
 
 DEF_HELPER_3(addv, i32, env, i32, i32)
-DEF_HELPER_3(addc, i32, env, i32, i32)
 DEF_HELPER_3(subv, i32, env, i32, i32)
-DEF_HELPER_3(subc, i32, env, i32, i32)
 DEF_HELPER_3(div1, i32, env, i32, i32)
 DEF_HELPER_3(macl, void, env, i32, i32)
 DEF_HELPER_3(macw, void, env, i32, i32)
diff --git a/target-sh4/op_helper.c b/target-sh4/op_helper.c
index bf835fac0f5bf7e8bb74320869497c3d5d83b294..3ad10bab94d55a401df1bc25be16764a5b488bda 100644
--- a/target-sh4/op_helper.c
+++ b/target-sh4/op_helper.c
@@ -177,22 +177,6 @@ void helper_ocbi(CPUSH4State *env, uint32_t address)
     }
 }
 
-uint32_t helper_addc(CPUSH4State *env, uint32_t arg0, uint32_t arg1)
-{
-    uint32_t tmp0, tmp1;
-
-    tmp1 = arg0 + arg1;
-    tmp0 = arg1;
-    arg1 = tmp1 + (env->sr & 1);
-    if (tmp0 > tmp1)
-	env->sr |= SR_T;
-    else
-	env->sr &= ~SR_T;
-    if (tmp1 > arg1)
-	env->sr |= SR_T;
-    return arg1;
-}
-
 uint32_t helper_addv(CPUSH4State *env, uint32_t arg0, uint32_t arg1)
 {
     uint32_t dest, src, ans;
@@ -375,22 +359,6 @@ void helper_macw(CPUSH4State *env, uint32_t arg0, uint32_t arg1)
     }
 }
 
-uint32_t helper_subc(CPUSH4State *env, uint32_t arg0, uint32_t arg1)
-{
-    uint32_t tmp0, tmp1;
-
-    tmp1 = arg1 - arg0;
-    tmp0 = arg1;
-    arg1 = tmp1 - (env->sr & SR_T);
-    if (tmp0 < tmp1)
-	env->sr |= SR_T;
-    else
-	env->sr &= ~SR_T;
-    if (tmp1 < arg1)
-	env->sr |= SR_T;
-    return arg1;
-}
-
 uint32_t helper_subv(CPUSH4State *env, uint32_t arg0, uint32_t arg1)
 {
     int32_t dest, src, ans;
diff --git a/target-sh4/translate.c b/target-sh4/translate.c
index d05c74c8c33c289769a16a9127a41ec458bc6626..92f9b462fff805f6df9f295bb49df1ca769a0dc3 100644
--- a/target-sh4/translate.c
+++ b/target-sh4/translate.c
@@ -761,7 +761,24 @@ static void _decode_opc(DisasContext * ctx)
 	tcg_gen_add_i32(REG(B11_8), REG(B11_8), REG(B7_4));
 	return;
     case 0x300e:		/* addc Rm,Rn */
-        gen_helper_addc(REG(B11_8), cpu_env, REG(B7_4), REG(B11_8));
+        {
+            TCGv t0, t1, t2;
+            t0 = tcg_temp_new();
+            tcg_gen_andi_i32(t0, cpu_sr, SR_T);
+            t1 = tcg_temp_new();
+            tcg_gen_add_i32(t1, REG(B7_4), REG(B11_8));
+            tcg_gen_add_i32(t0, t0, t1);
+            t2 = tcg_temp_new();
+            tcg_gen_setcond_i32(TCG_COND_GTU, t2, REG(B11_8), t1);
+            tcg_gen_setcond_i32(TCG_COND_GTU, t1, t1, t0);
+            tcg_gen_or_i32(t1, t1, t2);
+            tcg_temp_free(t2);
+            tcg_gen_andi_i32(cpu_sr, cpu_sr, ~SR_T);
+            tcg_gen_or_i32(cpu_sr, cpu_sr, t1);
+            tcg_temp_free(t1);
+            tcg_gen_mov_i32(REG(B11_8), t0);
+            tcg_temp_free(t0);
+        }
 	return;
     case 0x300f:		/* addv Rm,Rn */
         gen_helper_addv(REG(B11_8), cpu_env, REG(B7_4), REG(B11_8));
@@ -1013,7 +1030,24 @@ static void _decode_opc(DisasContext * ctx)
 	tcg_gen_sub_i32(REG(B11_8), REG(B11_8), REG(B7_4));
 	return;
     case 0x300a:		/* subc Rm,Rn */
-        gen_helper_subc(REG(B11_8), cpu_env, REG(B7_4), REG(B11_8));
+        {
+            TCGv t0, t1, t2;
+            t0 = tcg_temp_new();
+            tcg_gen_andi_i32(t0, cpu_sr, SR_T);
+            t1 = tcg_temp_new();
+            tcg_gen_sub_i32(t1, REG(B11_8), REG(B7_4));
+            tcg_gen_sub_i32(t0, t1, t0);
+            t2 = tcg_temp_new();
+            tcg_gen_setcond_i32(TCG_COND_LTU, t2, REG(B11_8), t1);
+            tcg_gen_setcond_i32(TCG_COND_LTU, t1, t1, t0);
+            tcg_gen_or_i32(t1, t1, t2);
+            tcg_temp_free(t2);
+            tcg_gen_andi_i32(cpu_sr, cpu_sr, ~SR_T);
+            tcg_gen_or_i32(cpu_sr, cpu_sr, t1);
+            tcg_temp_free(t1);
+            tcg_gen_mov_i32(REG(B11_8), t0);
+            tcg_temp_free(t0);
+        }
 	return;
     case 0x300b:		/* subv Rm,Rn */
         gen_helper_subv(REG(B11_8), cpu_env, REG(B7_4), REG(B11_8));