2018-01-11 Richard Biener <rguenther@suse.de>

	PR tree-optimization/83435
	* graphite.c (canonicalize_loop_form): Ignore fake loop exit edges.
	* graphite-scop-detection.c (scop_detection::get_sese): Likewise.
	* tree-vrp.c (add_assert_info): Drop TREE_OVERFLOW if they appear.

	* gcc.dg/graphite/pr83435.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@256535 138bc75d-0d04-0410-961f-82ee72b054a4

6 files changed, 41 insertions, 2 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f27395d5e7f..6c8fdd1645f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-01-11  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/83435
+	* graphite.c (canonicalize_loop_form): Ignore fake loop exit edges.
+	* graphite-scop-detection.c (scop_detection::get_sese): Likewise.
+	* tree-vrp.c (add_assert_info): Drop TREE_OVERFLOW if they appear.
+
 2018-01-11  Richard Sandiford  <richard.sandiford@linaro.org>
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
diff --git a/gcc/graphite-scop-detection.c b/gcc/graphite-scop-detection.c
index b15b26dbb22..1f2f990b690 100644
--- a/gcc/graphite-scop-detection.c
+++ b/gcc/graphite-scop-detection.c
@@ -428,7 +428,7 @@ scop_detection::get_sese (loop_p loop)
 
   edge scop_begin = loop_preheader_edge (loop);
   edge scop_end = single_exit (loop);
-  if (!scop_end || (scop_end->flags & EDGE_COMPLEX))
+  if (!scop_end || (scop_end->flags & (EDGE_COMPLEX|EDGE_FAKE)))
     return invalid_sese;
   /* Include the BB with the loop-closed SSA PHI nodes.
      canonicalize_loop_closed_ssa makes sure that is in proper shape.  */
diff --git a/gcc/graphite.c b/gcc/graphite.c
index 3b7f46bebd6..bcf48284f75 100644
--- a/gcc/graphite.c
+++ b/gcc/graphite.c
@@ -324,7 +324,7 @@ canonicalize_loop_form (void)
   FOR_EACH_LOOP (loop, LI_FROM_INNERMOST)
     {
       edge e = single_exit (loop);
-      if (!e || (e->flags & EDGE_COMPLEX))
+      if (!e || (e->flags & (EDGE_COMPLEX|EDGE_FAKE)))
 	continue;
 
       canonicalize_loop_closed_ssa (loop, e);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index afd7327b3d7..fde8bcc383e 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-11  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/83435
+	* gcc.dg/graphite/pr83435.c: New testcase.
+
 2018-01-11  Richard Sandiford  <richard.sandiford@linaro.org>
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
diff --git a/gcc/testsuite/gcc.dg/graphite/pr83435.c b/gcc/testsuite/gcc.dg/graphite/pr83435.c
new file mode 100644
index 00000000000..1b70c861f43
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/graphite/pr83435.c
@@ -0,0 +1,25 @@
+/* { dg-do compile } */
+/* { dg-options "-O -ftree-parallelize-loops=2 -floop-parallelize-all" } */
+
+int yj, ax;
+
+void
+gf (signed char mp)
+{
+  int *dh = &yj;
+
+  for (;;)
+    {
+      signed char sb;
+
+      for (sb = 0; sb < 1; sb -= 8)
+	{
+	}
+
+      mp &= mp <= sb;
+      if (mp == 0)
+	dh = &ax;
+      mp = 0;
+      *dh = 0;
+    }
+}
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index 69762ab795e..3294bde9b94 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -2786,6 +2786,8 @@ add_assert_info (vec<assert_info> &asserts,
   assert_info info;
   info.comp_code = comp_code;
   info.name = name;
+  if (TREE_OVERFLOW_P (val))
+    val = drop_tree_overflow (val);
   info.val = val;
   info.expr = expr;
   asserts.safe_push (info);