[PATCH v3 4/4] target/sh4: Rename TCGv variables as manual for SUBV opcode

[Philippe Mathieu-Daudé]

To easily compare with the SH4 manual, rename:

  REG(B11_8) -> Rn
  REG(B7_4) -> Rm
  t0 -> result

Mention how underflow is calculated.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 target/sh4/translate.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/target/sh4/translate.c b/target/sh4/translate.c
index 47c0f3404e..b0ac631859 100644
--- a/target/sh4/translate.c
+++ b/target/sh4/translate.c
@@ -933,16 +933,20 @@ static void _decode_opc(DisasContext * ctx)
         return;
     case 0x300b: /* subv Rm,Rn */
         {
-            TCGv t0, t1, t2;
-            t0 = tcg_temp_new();
-            tcg_gen_sub_i32(t0, REG(B11_8), REG(B7_4));
+            TCGv Rn = REG(B11_8);
+            TCGv Rm = REG(B7_4);
+            TCGv result, t1, t2;
+
+            result = tcg_temp_new();
             t1 = tcg_temp_new();
-            tcg_gen_xor_i32(t1, t0, REG(B11_8));
             t2 = tcg_temp_new();
-            tcg_gen_xor_i32(t2, REG(B11_8), REG(B7_4));
+            tcg_gen_add_i32(result, Rn, Rm);
+            /* T = ((Rn ^ Rm) & (Result ^ Rn)) >> 31 */
+            tcg_gen_xor_i32(t1, result, Rn);
+            tcg_gen_xor_i32(t2, Rn, Rm);
             tcg_gen_and_i32(t1, t1, t2);
             tcg_gen_shri_i32(cpu_sr_t, t1, 31);
-            tcg_gen_mov_i32(REG(B11_8), t0);
+            tcg_gen_mov_i32(Rm, result);
         }
         return;
     case 0x2008: /* tst Rm,Rn */
-- 
2.41.0