phiopt: Fix up two_value_replacement BOOLEAN_TYPE handling for Ada [PR98188]

For Ada with LTO, boolean_{false,true}_node can be 1-bit precision boolean,
while TREE_TYPE (lhs) can be 8-bit precision boolean and thus we can end up
with wide_int mismatches.

This patch for non-VR_RANGE just use VARYING min/max manually.
The min + 1 != max check will then do the rest.

2020-12-09  Jakub Jelinek  <jakub@redhat.com>

	PR bootstrap/98188
	* tree-ssa-phiopt.c (two_value_replacement): Don't special case
	BOOLEAN_TYPEs for ranges, instead if get_range_info doesn't return
	VR_RANGE, set min/max to wi::min/max_value.

diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c
index 21b88c0..3d40f07 100644 (file)
--- a/gcc/tree-ssa-phiopt.c
+++ b/gcc/tree-ssa-phiopt.c
@@ -658,13 +658,13 @@ two_value_replacement (basic_block cond_bb, basic_block middle_bb,
     return false;
 
   wide_int min, max;
-  if (TREE_CODE (TREE_TYPE (lhs)) == BOOLEAN_TYPE)
+  if (get_range_info (lhs, &min, &max) != VR_RANGE)
     {
-      min = wi::to_wide (boolean_false_node);
-      max = wi::to_wide (boolean_true_node);
+      int prec = TYPE_PRECISION (TREE_TYPE (lhs));
+      signop sgn = TYPE_SIGN (TREE_TYPE (lhs));
+      min = wi::min_value (prec, sgn);
+      max = wi::max_value (prec, sgn);
     }
-  else if (get_range_info (lhs, &min, &max) != VR_RANGE)
-    return false;
   if (min + 1 != max
       || (wi::to_wide (rhs) != min
          && wi::to_wide (rhs) != max))