From: Richard Biener <rguenther@suse.de>
Date: Mon, 5 Mar 2018 12:49:07 +0000 (+0000)
Subject: re PR tree-optimization/84650 ([graphite] ICE: Segmentation fault (in create_new_iv))
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=144a822fec6d680b2847f2bd35a6d6ebefd2d885;p=gcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bd2c768820f..ba2a9c47e3a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8e7e53b8546..48c40fa8f7f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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
diff --git a/gcc/testsuite/gcc.dg/graphite/pr84650.c b/gcc/testsuite/gcc.dg/graphite/pr84650.c
new file mode 100644
index 00000000000..e59d16184f1
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/graphite/pr84650.c
@@ -0,0 +1,18 @@
+/* { 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);
+    }
+}
diff --git a/gcc/tree-ssa-loop-im.c b/gcc/tree-ssa-loop-im.c
index 4655766ddbe..030aac0b616 100644
--- a/gcc/tree-ssa-loop-im.c
+++ b/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;
 }