tree-vrp.c (vrp_shift_undefined_p): Remove.

	* tree-vrp.c (vrp_shift_undefined_p): Remove.
	(extract_range_from_binary_expr_1: Call
	wide_int_range_shift_undefined_p instead of vrp_shift_undefined_p.
	* wide-int-range.h (wide_int_range_shift_undefined_p): Do not
	depend on sign.

From-SVN: r264228

gcc/ChangeLog

 2018-09-12  Aldy Hernandez  <aldyh@redhat.com>
 
+	* tree-vrp.c (vrp_shift_undefined_p): Remove.
+	(extract_range_from_binary_expr_1: Call
+	wide_int_range_shift_undefined_p instead of vrp_shift_undefined_p.
+	* wide-int-range.h (wide_int_range_shift_undefined_p): Do not
+	depend on sign.
+
+2018-09-12  Aldy Hernandez  <aldyh@redhat.com>
+
 	* gimple-ssa-warn-alloca.c
 	(alloca_type_and_limit::alloca_type_and_limit): Initialize limit
 	field for ALLOCA_BOUND_*_LARGE.

gcc/tree-vrp.c

@@ -1018,17 +1018,6 @@ extract_range_into_wide_ints (const value_range *vr,
     }
 }
 
-/* Value range wrapper for wide_int_range_shift_undefined_p.  */
-
-static inline bool
-vrp_shift_undefined_p (const value_range &shifter, unsigned prec)
-{
-  tree type = TREE_TYPE (shifter.min);
-  return wide_int_range_shift_undefined_p (TYPE_SIGN (type), prec,
-					   wi::to_wide (shifter.min),
-					   wi::to_wide (shifter.max));
-}
-
 /* Value range wrapper for wide_int_range_multiplicative_op:
 
      *VR = *VR0 .CODE. *VR1.  */
@@ -1549,7 +1538,9 @@ extract_range_from_binary_expr_1 (value_range *vr,
 	   || code == LSHIFT_EXPR)
     {
       if (range_int_cst_p (&vr1)
-	  && !vrp_shift_undefined_p (vr1, prec))
+	  && !wide_int_range_shift_undefined_p (prec,
+						wi::to_wide (vr1.min),
+						wi::to_wide (vr1.max)))
 	{
 	  if (code == RSHIFT_EXPR)
 	    {

gcc/wide-int-range.h

@@ -131,7 +131,7 @@ extern bool wide_int_range_div (wide_int &wmin, wide_int &wmax,
 /* Return TRUE if shifting by range [MIN, MAX] is undefined behavior.  */
 
 inline bool
-wide_int_range_shift_undefined_p (signop sign, unsigned prec,
+wide_int_range_shift_undefined_p (unsigned prec,
 				  const wide_int &min, const wide_int &max)
 {
   /* ?? Note: The original comment said this only applied to
@@ -142,7 +142,7 @@ wide_int_range_shift_undefined_p (signop sign, unsigned prec,
      behavior from the shift operation.  We cannot even trust
      SHIFT_COUNT_TRUNCATED at this stage, because that applies to rtl
      shifts, and the operation at the tree level may be widened.  */
-  return wi::lt_p (min, 0, sign) || wi::ge_p (max, prec, sign);
+  return wi::sign_mask (min) || wi::ge_p (max, prec, UNSIGNED);
 }
 
 /* Calculate MIN/MAX_EXPR of two ranges and store the result in [MIN, MAX].  */