Fix trap in pointer conversion in op1_range.

Processing op1_range for conversion between a non-pointer and pointer
shouldnt do any fancy math.

	gcc/
	PR tree-optimization/97750
	* range-op.cc (operator_cast::op1_range): Handle pointers better.
	gcc/testsuite/
	* gcc.dg/pr97750.c: New.

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 36f9fd6..a473f33 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -1850,6 +1850,31 @@ operator_cast::op1_range (irange &r, tree type,
   tree lhs_type = lhs.type ();
   gcc_checking_assert (types_compatible_p (op2.type(), type));
 
+  // If we are calculating a pointer, shortcut to what we really care about.
+  if (POINTER_TYPE_P (type))
+    {
+      // Conversion from other pointers or a constant (including 0/NULL)
+      // are straightforward.
+      if (POINTER_TYPE_P (lhs.type ())
+	  || (lhs.singleton_p ()
+	      && TYPE_PRECISION (lhs.type ()) >= TYPE_PRECISION (type)))
+	{
+	  r = lhs;
+	  range_cast (r, type);
+	}
+      else
+	{
+	  // If the LHS is not a pointer nor a singleton, then it is
+	  // either VARYING or non-zero.
+	  if (!lhs.contains_p (build_zero_cst (lhs.type ())))
+	    r.set_nonzero (type);
+	  else
+	    r.set_varying (type);
+	}
+      r.intersect (op2);
+      return true;
+    }
+
   if (truncating_cast_p (op2, lhs))
     {
       if (lhs.varying_p ())