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

[James Greenhalgh <james dot greenhalgh at arm dot com>]

Hi,

In aarch64_float_const_representable, `sign' is unused.

This patch removes all references to it. The patch is equally
applicable to trunk and aarch64-4.7-branch.

This patch fixes the warning:

config/aarch64/aarch64.c: In function âaarch64_float_const_representable_pâ:
config/aarch64/aarch64.c:7075:7: warning: variable âsignâ set but not used [-Wunused-but-set-variable]

Regression tested on aarch64-none-elf with no regressions.

OK for trunk and aarch64-4.7-branch?

Thanks,
James Greenhalgh

---
gcc/

2013-02-28  James Greenhalgh  <james.greenhalgh@arm.com>

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

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index a1e4cdd..8c8532c 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/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);