Do not query SCEV in range_of_phi unless dominators are available.

SCEV won't work without dominators and we can get called without
dominators from debug_ranger.

Another option would be to rename scev_initialized_p to something like
scev_available_p and move the check there.  For now, this will do.

gcc/ChangeLog:

	* gimple-range-fold.cc (fold_using_range::range_of_phi): Check
	dom_info_available_p.

diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index 80cc5c0..770a6c9 100644 (file)
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -814,7 +814,9 @@ fold_using_range::range_of_phi (irange &r, gphi *phi, fur_source &src)
       }
 
   // If SCEV is available, query if this PHI has any knonwn values.
-  if (scev_initialized_p () && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
+  if (dom_info_available_p (CDI_DOMINATORS)
+      && scev_initialized_p ()
+      && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
     {
       value_range loop_range;
       class loop *l = loop_containing_stmt (phi);