Speed up get_bitmask_from_range

When min != max we know min ^ max != 0.

	* value-range.cc (get_bitmask_from_range): Remove redundant
	compare of xorv with zero.

diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index 9c3eb78459ddeae2fc813bb5ac10e36a521ea231..3046232bbca2c1a54d04490835df79d18d7f41bf 100644 (file)
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -48,10 +48,7 @@ get_bitmask_from_range (tree type,
     }
 
   wide_int xorv = min ^ max;
-
-  if (xorv != 0)
-    xorv = wi::mask (prec - wi::clz (xorv), false, prec);
-
+  xorv = wi::mask (prec - wi::clz (xorv), false, prec);
   return irange_bitmask (wi::zero (prec), min | xorv);
 }