re PR tree-optimization/86232 (ICE in record_estimate, at tree-ssa-loop-niter.c:3258)

2018-06-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/86232
	* tree-ssa-loop-niter.c (number_of_iterations_popcount): Adjust
	max for constant niter.

	* gcc.dg/torture/pr86232.c: New testcase.

From-SVN: r261843

gcc/ChangeLog

+2018-06-21  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/86232
+	* tree-ssa-loop-niter.c (number_of_iterations_popcount): Adjust
+	max for constant niter.
+
 2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
 	* config/aarch64/aarch64-simd.md

gcc/testsuite/ChangeLog

+2018-06-21  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/86232
+	* gcc.dg/torture/pr86232.c: New testcase.
+
 2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
 	* gcc/gcc.target/aarch64/aes_xor_combine.c: New test.

gcc/testsuite/gcc.dg/torture/pr86232.c

+/* { dg-do compile } */
+
+enum { a = 1 } b;
+int c()
+{
+  int d = a;
+  for (; d;)
+    d &= d - 1;
+  return b;
+}

gcc/tree-ssa-loop-niter.c

@@ -2575,9 +2575,6 @@ number_of_iterations_popcount (loop_p loop, edge exit,
     return false;
 
   /* Update NITER params accordingly  */
-  max = TYPE_PRECISION (TREE_TYPE (src));
-  if (adjust)
-    max = max - 1;
   tree utype = unsigned_type_for (TREE_TYPE (src));
   src = fold_convert (utype, src);
   tree call = fold_convert (utype, build_call_expr (fn, 1, src));
@@ -2588,6 +2585,15 @@ number_of_iterations_popcount (loop_p loop, edge exit,
   else
     iter = call;
 
+  if (TREE_CODE (call) == INTEGER_CST)
+    max = tree_to_uhwi (call);
+  else
+    {
+      max = TYPE_PRECISION (TREE_TYPE (src));
+      if (adjust)
+	max = max - 1;
+    }
+
   niter->niter = iter;
   niter->assumptions = boolean_true_node;
   if (adjust)