[Qemu-devel] [PATCH 20/38] target-arm: Implement adc_cc inline

[Richard Henderson]

Use add2 if available, otherwise use 64-bit arithmetic.

Cc: Peter Maydell <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
 target-arm/helper.h    |  1 -
 target-arm/op_helper.c | 15 ---------------
 target-arm/translate.c | 39 ++++++++++++++++++++++++++++++++++-----
 3 files changed, 34 insertions(+), 21 deletions(-)

diff --git a/target-arm/helper.h b/target-arm/helper.h
index bca5a5b..507bb9c 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -140,7 +140,6 @@ DEF_HELPER_2(recpe_u32, i32, i32, env)
 DEF_HELPER_2(rsqrte_u32, i32, i32, env)
 DEF_HELPER_5(neon_tbl, i32, env, i32, i32, i32, i32)
 
-DEF_HELPER_3(adc_cc, i32, env, i32, i32)
 DEF_HELPER_3(sbc_cc, i32, env, i32, i32)
 
 DEF_HELPER_3(shl_cc, i32, env, i32, i32)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 99610d7..49fc036 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -315,21 +315,6 @@ uint64_t HELPER(get_cp_reg64)(CPUARMState *env, void *rip)
    The only way to do that in TCG is a conditional branch, which clobbers
    all our temporaries.  For now implement these as helper functions.  */
 
-uint32_t HELPER(adc_cc)(CPUARMState *env, uint32_t a, uint32_t b)
-{
-    uint32_t result;
-    if (!env->CF) {
-        result = a + b;
-        env->CF = result < a;
-    } else {
-        result = a + b + 1;
-        env->CF = result <= a;
-    }
-    env->VF = (a ^ b ^ -1) & (a ^ result);
-    env->NF = env->ZF = result;
-    return result;
-}
-
 uint32_t HELPER(sbc_cc)(CPUARMState *env, uint32_t a, uint32_t b)
 {
     uint32_t result;
diff --git a/target-arm/translate.c b/target-arm/translate.c
index ca6f0af..493448a 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -421,6 +421,34 @@ static void gen_add_CC(TCGv dest, TCGv t0, TCGv t1)
     tcg_gen_mov_i32(dest, cpu_NF);
 }
 
+/* dest = T0 + T1 + CF.  Compute C, N, V and Z flags */
+static void gen_adc_CC(TCGv dest, TCGv t0, TCGv t1)
+{
+    TCGv tmp = tcg_temp_new_i32();
+    if (TCG_TARGET_HAS_add2_i32) {
+        tcg_gen_movi_i32(tmp, 0);
+        tcg_gen_add2_i32(cpu_NF, cpu_CF, t0, tmp, cpu_CF, tmp);
+        tcg_gen_add2_i32(cpu_NF, cpu_CF, t0, cpu_CF, t1, tmp);
+    } else {
+        TCGv_i64 q0 = tcg_temp_new_i64();
+        TCGv_i64 q1 = tcg_temp_new_i64();
+        tcg_gen_extu_i32_i64(q0, t0);
+        tcg_gen_extu_i32_i64(q1, t1);
+        tcg_gen_add_i64(q0, q0, q1);
+        tcg_gen_extu_i32_i64(q1, cpu_CF);
+        tcg_gen_add_i64(q0, q0, q1);
+        tcg_gen_extr_i64_i32(cpu_NF, cpu_CF, q0);
+        tcg_temp_free_i64(q0);
+        tcg_temp_free_i64(q1);
+    }
+    tcg_gen_mov_i32(cpu_ZF, cpu_NF);
+    tcg_gen_xor_i32(cpu_VF, cpu_NF, t0);
+    tcg_gen_xor_i32(tmp, t0, t1);
+    tcg_gen_andc_i32(cpu_VF, cpu_VF, tmp);
+    tcg_temp_free_i32(tmp);
+    tcg_gen_mov_i32(dest, cpu_NF);
+}
+
 /* dest = T0 - T1. Compute C, N, V and Z flags */
 static void gen_sub_CC(TCGv dest, TCGv t0, TCGv t1)
 {
@@ -7073,7 +7101,7 @@ static void disas_arm_insn(CPUARMState * env, 
DisasContext *s)
             break;
         case 0x05:
             if (set_cc) {
-                gen_helper_adc_cc(tmp, cpu_env, tmp, tmp2);
+                gen_adc_CC(tmp, tmp, tmp2);
             } else {
                 gen_add_carry(tmp, tmp, tmp2);
             }
@@ -7914,7 +7942,7 @@ gen_thumb2_data_op(DisasContext *s, int op, int conds, 
uint32_t shifter_out, TCG
         break;
     case 10: /* adc */
         if (conds)
-            gen_helper_adc_cc(t0, cpu_env, t0, t1);
+            gen_adc_CC(t0, t0, t1);
         else
             gen_adc(t0, t1);
         break;
@@ -9232,10 +9260,11 @@ static void disas_thumb_insn(CPUARMState *env, 
DisasContext *s)
             }
             break;
         case 0x5: /* adc */
-            if (s->condexec_mask)
+            if (s->condexec_mask) {
                 gen_adc(tmp, tmp2);
-            else
-                gen_helper_adc_cc(tmp, cpu_env, tmp, tmp2);
+            } else {
+                gen_adc_CC(tmp, tmp, tmp2);
+            }
             break;
         case 0x6: /* sbc */
             if (s->condexec_mask)
-- 
1.8.1.2