target/m68k: Avoid tcg_const_i32 when modified

In several instances, a temp is initialized with a
for use as a constant, and then subsequently used
as an unrelated temp.  Split them.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 3055d2d24619b778e7c71982b9a1e777b72ddd60..0002d80bf9b1b68d49c845428f7ca7e30cfc7b0f 100644 (file)
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -1631,8 +1631,8 @@ static void bcd_add(TCGv dest, TCGv src)
      *    = result with some possible exceeding 0x6
      */
 
-    t0 = tcg_const_i32(0x066);
-    tcg_gen_add_i32(t0, t0, src);
+    t0 = tcg_temp_new();
+    tcg_gen_addi_i32(t0, src, 0x066);
 
     t1 = tcg_temp_new();
     tcg_gen_add_i32(t1, t0, dest);
@@ -1818,7 +1818,8 @@ DISAS_INSN(nbcd)
 
     SRC_EA(env, src, OS_BYTE, 0, &addr);
 
-    dest = tcg_const_i32(0);
+    dest = tcg_temp_new();
+    tcg_gen_movi_i32(dest, 0);
     bcd_sub(dest, src);
 
     DEST_EA(env, insn, OS_BYTE, dest, &addr);
@@ -1896,8 +1897,8 @@ DISAS_INSN(bitop_reg)
     else
         tcg_gen_andi_i32(src2, DREG(insn, 9), 31);
 
-    tmp = tcg_const_i32(1);
-    tcg_gen_shl_i32(tmp, tmp, src2);
+    tmp = tcg_temp_new();
+    tcg_gen_shl_i32(tmp, tcg_constant_i32(1), src2);
 
     tcg_gen_and_i32(QREG_CC_Z, src1, tmp);
 
@@ -3076,7 +3077,7 @@ DISAS_INSN(suba)
 
 static inline void gen_subx(DisasContext *s, TCGv src, TCGv dest, int opsize)
 {
-    TCGv tmp;
+    TCGv tmp, zero;
 
     gen_flush_flags(s); /* compute old Z */
 
@@ -3085,14 +3086,15 @@ static inline void gen_subx(DisasContext *s, TCGv src, TCGv dest, int opsize)
      * (X, N) = dest - (src + X);
      */
 
-    tmp = tcg_const_i32(0);
-    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, src, tmp, QREG_CC_X, tmp);
-    tcg_gen_sub2_i32(QREG_CC_N, QREG_CC_X, dest, tmp, QREG_CC_N, QREG_CC_X);
+    zero = tcg_constant_i32(0);
+    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, src, zero, QREG_CC_X, zero);
+    tcg_gen_sub2_i32(QREG_CC_N, QREG_CC_X, dest, zero, QREG_CC_N, QREG_CC_X);
     gen_ext(QREG_CC_N, QREG_CC_N, opsize, 1);
     tcg_gen_andi_i32(QREG_CC_X, QREG_CC_X, 1);
 
     /* Compute signed-overflow for subtract.  */
 
+    tmp = tcg_temp_new();
     tcg_gen_xor_i32(QREG_CC_V, QREG_CC_N, dest);
     tcg_gen_xor_i32(tmp, dest, src);
     tcg_gen_and_i32(QREG_CC_V, QREG_CC_V, tmp);
@@ -3279,7 +3281,7 @@ DISAS_INSN(adda)
 
 static inline void gen_addx(DisasContext *s, TCGv src, TCGv dest, int opsize)
 {
-    TCGv tmp;
+    TCGv tmp, zero;
 
     gen_flush_flags(s); /* compute old Z */
 
@@ -3288,13 +3290,14 @@ static inline void gen_addx(DisasContext *s, TCGv src, TCGv dest, int opsize)
      * (X, N) = src + dest + X;
      */
 
-    tmp = tcg_const_i32(0);
-    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_X, tmp, dest, tmp);
-    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_N, QREG_CC_X, src, tmp);
+    zero = tcg_constant_i32(0);
+    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_X, zero, dest, zero);
+    tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_N, QREG_CC_X, src, zero);
     gen_ext(QREG_CC_N, QREG_CC_N, opsize, 1);
 
     /* Compute signed-overflow for addition.  */
 
+    tmp = tcg_temp_new();
     tcg_gen_xor_i32(QREG_CC_V, QREG_CC_N, src);
     tcg_gen_xor_i32(tmp, dest, src);
     tcg_gen_andc_i32(QREG_CC_V, QREG_CC_V, tmp);