double-int.h (HOST_BITS_PER_DOUBLE_INT): Define.

	* double-int.h (HOST_BITS_PER_DOUBLE_INT): Define.
	(double_int_not, double_int_lshift, double_int_rshift): Declare.
	(double_int_negative_p): Convert to static inline function.
	* double-int.c (double_int_lshift, double_int_lshift): Add new function.
	(double_int_negative_p): Remove.
	* tree.h (lshift_double, rshift_double): 
	* tree.c (build_low_bits_mask): Clean up, use double_int_* functions.
	* fold-const.c (fold_convert_const_int_from_real,
	fold_convert_const_int_from_fixed, div_if_zero_remainder): (Ditto.).
	(lshift_double): Change type of arith argument to bool.
	(rshift_double): Change type of arith argument to bool. Correct
	comment.
	* expmed.c (mask_rtx, lshift_value): (Ditto.).

From-SVN: r158360

1 files changed, 5 insertions, 19 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 5da8206..83f1237 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1221,32 +1221,18 @@ build_int_cst_wide (tree type, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
 tree
 build_low_bits_mask (tree type, unsigned bits)
 {
-  unsigned HOST_WIDE_INT low;
-  HOST_WIDE_INT high;
-  unsigned HOST_WIDE_INT all_ones = ~(unsigned HOST_WIDE_INT) 0;
+  double_int mask;
 
   gcc_assert (bits <= TYPE_PRECISION (type));
 
   if (bits == TYPE_PRECISION (type)
       && !TYPE_UNSIGNED (type))
-    {
-      /* Sign extended all-ones mask.  */
-      low = all_ones;
-      high = -1;
-    }
-  else if (bits <= HOST_BITS_PER_WIDE_INT)
-    {
-      low = all_ones >> (HOST_BITS_PER_WIDE_INT - bits);
-      high = 0;
-    }
+    /* Sign extended all-ones mask.  */
+    mask = double_int_minus_one;
   else
-    {
-      bits -= HOST_BITS_PER_WIDE_INT;
-      low = all_ones;
-      high = all_ones >> (HOST_BITS_PER_WIDE_INT - bits);
-    }
+    mask = double_int_mask (bits);
 
-  return build_int_cst_wide (type, low, high);
+  return build_int_cst_wide (type, mask.low, mask.high);
 }
 
 /* Checks that X is integer constant that can be expressed in (unsigned)