re PR tree-optimization/84650 ([graphite] ICE: Segmentation fault (in create_new_iv))

2018-03-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84650
	* tree-ssa-loop-im.c (pass_lim::execute): Reset the SCEV cache
	if executed in the loop pipeline.

	* gcc.dg/graphite/pr84650.c: New testcase.

From-SVN: r258242

gcc/ChangeLog

+2018-03-05  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/84650
+	* tree-ssa-loop-im.c (pass_lim::execute): Reset the SCEV cache
+	if executed in the loop pipeline.
+
 2018-03-05  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* doc/configfiles.texi (Configuration Files): Move info about

gcc/testsuite/ChangeLog

+2018-03-05  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/84650
+	* gcc.dg/graphite/pr84650.c: New testcase.
+
 2018-03-05  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/82022

gcc/testsuite/gcc.dg/graphite/pr84650.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fgraphite-identity -fno-tree-copy-prop --param lim-expensive=3" } */
+
+unsigned int dj;
+
+void
+np (void)
+{
+  const unsigned int uw = 2;
+  unsigned int eu;
+
+  for (eu = 0; eu < uw; ++eu)
+    {
+      for (dj = 0; dj < uw; ++dj)
+	;
+      eu -= !!(dj - uw - 1);
+    }
+}

gcc/tree-ssa-loop-im.c

@@ -2616,6 +2616,8 @@ pass_lim::execute (function *fun)
 
   if (!in_loop_pipeline)
     loop_optimizer_finalize ();
+  else
+    scev_reset ();
   return todo;
 }