From d002d099b0107491a905b6d3e574ed0436fca3a9 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 21 Feb 2017 17:29:37 +0100
Subject: [PATCH] re PR middle-end/79649 (Memset pattern in named address space
 crashes compiler or generates wrong code)

	PR tree-optimization/79649
	* tree-loop-distribution.c (classify_partition): Give up on
	non-generic address space loads/stores.

	* gcc.target/i386/pr79649.c: New test.

From-SVN: r245631
---
 gcc/ChangeLog                           |  6 +++
 gcc/testsuite/ChangeLog                 |  3 ++
 gcc/testsuite/gcc.target/i386/pr79649.c | 53 +++++++++++++++++++++++++
 gcc/tree-loop-distribution.c            |  7 ++++
 4 files changed, 69 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr79649.c

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 05bdf01c8bf..0697aeccb9e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-02-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/79649
+	* tree-loop-distribution.c (classify_partition): Give up on
+	non-generic address space loads/stores.
+
 2017-02-21  Aldy Hernandez  <aldyh@redhat.com>
 
 	* doc/loop.texi (Loop manipulation): Remove nonexistent
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b9c70a7b77b..e35dd7c0cda 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2017-02-21  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/79649
+	* gcc.target/i386/pr79649.c: New test.
+
 	PR target/79494
 	* gcc.dg/pr79494.c: New test.
 
diff --git a/gcc/testsuite/gcc.target/i386/pr79649.c b/gcc/testsuite/gcc.target/i386/pr79649.c
new file mode 100644
index 00000000000..e3d0110a1d0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr79649.c
@@ -0,0 +1,53 @@
+/* PR tree-optimization/79649 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -fdump-tree-optimized" } */
+/* { dg-final { scan-tree-dump-not "__builtin_memset" "optimized" } } */
+/* { dg-final { scan-tree-dump-not "__builtin_memcpy" "optimized" } } */
+/* { dg-final { scan-tree-dump-not "__builtin_memmove" "optimized" } } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void
+f1 (unsigned char __seg_gs *s, size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    s[i] = 0;
+}
+
+void
+f2 (unsigned char __seg_gs *__restrict d, unsigned char __seg_gs *__restrict s, size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    d[i] = s[i];
+}
+
+void
+f3 (unsigned char __seg_gs *__restrict d, unsigned char *__restrict s, size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    d[i] = s[i];
+}
+
+void
+f4 (unsigned char *__restrict d, unsigned char __seg_gs *__restrict s, size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    d[i] = s[i];
+}
+
+void
+f5 (unsigned char __seg_gs *__restrict d, unsigned char __seg_fs *__restrict s, size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    d[i] = s[i];
+}
+
+struct A { int a; char b[1024]; };
+extern struct A __seg_gs a;
+
+void
+f6 (size_t n)
+{
+  for (size_t i = 0; i < n; ++i)
+    a.b[i] = 0;
+}
diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c
index 0fec1d6121c..4b94d0f9f8a 100644
--- a/gcc/tree-loop-distribution.c
+++ b/gcc/tree-loop-distribution.c
@@ -1072,6 +1072,13 @@ classify_partition (loop_p loop, struct graph *rdg, partition *partition)
       /* But exactly one store and/or load.  */
       for (j = 0; RDG_DATAREFS (rdg, i).iterate (j, &dr); ++j)
 	{
+	  tree type = TREE_TYPE (DR_REF (dr));
+
+	  /* The memset, memcpy and memmove library calls are only
+	     able to deal with generic address space.  */
+	  if (!ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (type)))
+	    return;
+
 	  if (DR_IS_READ (dr))
 	    {
 	      if (single_load != NULL)