target/m68k: Optimize rotate_x() using extract_i32()

Optimize rotate_x() using tcg_gen_extract_i32(). We can now free the
'sz' tcg_temp earlier. Since it is allocated with tcg_const_i32(),
free it with tcg_temp_free_i32().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190310003428.11723-6-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index bf700c01b116c7c06c30dfeec8bf9b84caccc5a7..f0534a4ba0c3af6dee771fc4fd1d03fbe5a7d658 100644 (file)
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -3693,6 +3693,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
         tcg_gen_sub_i32(shl, shl, shift); /* shl = size + 1 - shift */
         tcg_gen_sub_i32(shx, sz, shift); /* shx = size - shift */
     }
+    tcg_temp_free_i32(sz);
 
     /* reg = (reg << shl) | (reg >> shr) | (x << shx); */
 
@@ -3708,9 +3709,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
     /* X = (reg >> size) & 1 */
 
     X = tcg_temp_new();
-    tcg_gen_shr_i32(X, reg, sz);
-    tcg_gen_andi_i32(X, X, 1);
-    tcg_temp_free(sz);
+    tcg_gen_extract_i32(X, reg, size, 1);
 
     return X;
 }