tree-ssa-loop.prefetch.c (prune_ref_by_group_reuse): Cast abs() result to unsigned.

	* tree-ssa-loop.prefetch.c (prune_ref_by_group_reuse): Cast abs()
	result to unsigned.

From-SVN: r159397

gcc/ChangeLog

+2010-05-14  Pat Haugen  <pthaugen@us.ibm.com>
+
+	* tree-ssa-loop.prefetch.c (prune_ref_by_group_reuse): Cast abs()
+	result to unsigned.
+
 2010-05-14  Tristan Gingold  <gingold@adacore.com>
 
 	* toplev.c (default_debug_hooks): Remove this variable.

gcc/tree-ssa-loop-prefetch.c

@@ -717,7 +717,7 @@ prune_ref_by_group_reuse (struct mem_ref *ref, struct mem_ref *by,
       prefetch_before = (hit_from - delta_r + step - 1) / step;
 
       /* Do not reduce prefetch_before if we meet beyond cache size.  */
-      if (prefetch_before > abs (L2_CACHE_SIZE_BYTES / step))
+      if (prefetch_before > (unsigned) abs (L2_CACHE_SIZE_BYTES / step))
         prefetch_before = PREFETCH_ALL;
       if (prefetch_before < ref->prefetch_before)
 	ref->prefetch_before = prefetch_before;