[AArch64/AArch64-4.7] Fix warning - Unused variable in aarch64_float_const_representable.

gcc/
	* config/aarch64/aarch64.c
	(aarch64_float_const_representable): Remove unused variable.

From-SVN: r196352

gcc/ChangeLog

 2013-02-28  James Greenhalgh  <james.greenhalgh@arm.com>
 
+	* config/aarch64/aarch64.c
+	(aarch64_float_const_representable): Remove unused variable.
+
+2013-02-28  James Greenhalgh  <james.greenhalgh@arm.com>
+
 	* config/aarch64/aarch64.c (aarch64_mangle_type): Make static.
 
 2013-02-28  James Greenhalgh  <james.greenhalgh@arm.com>

gcc/config/aarch64/aarch64.c

@@ -7088,7 +7088,7 @@ aarch64_float_const_representable_p (rtx x)
   /* This represents our current view of how many bits
      make up the mantissa.  */
   int point_pos = 2 * HOST_BITS_PER_WIDE_INT - 1;
-  int sign, exponent;
+  int exponent;
   unsigned HOST_WIDE_INT mantissa, mask;
   HOST_WIDE_INT m1, m2;
   REAL_VALUE_TYPE r, m;
@@ -7105,8 +7105,7 @@ aarch64_float_const_representable_p (rtx x)
       || REAL_VALUE_MINUS_ZERO (r))
     return false;
 
-  /* Extract sign and exponent.  */
-  sign = REAL_VALUE_NEGATIVE (r) ? 1 : 0;
+  /* Extract exponent.  */
   r = real_value_abs (&r);
   exponent = REAL_EXP (&r);