From a1fc386ac283d309eb6af8cf7b009d528bc52a9a Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Thu, 1 Dec 2016 12:15:44 +0000
Subject: [PATCH] tree-ssa-alias.c (indirect_refs_may_alias_p): Do not treat
arrays with same type as objects that cannot overlap.
2016-12-01 Richard Biener <rguenther@suse.de>
* tree-ssa-alias.c (indirect_refs_may_alias_p): Do not
treat arrays with same type as objects that cannot overlap.
* gcc.dg/torture/alias-2.c: New testcase.
From-SVN: r243106
---
gcc/ChangeLog | 5 +++++
gcc/testsuite/ChangeLog | 4 ++++
gcc/testsuite/gcc.dg/torture/alias-2.c | 17 +++++++++++++++++
3 files changed, 26 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/torture/alias-2.c
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2683757d1b2c..19cb0ce48f32 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2016-12-01 Richard Biener <rguenther@suse.de>
+
+ * tree-ssa-alias.c (indirect_refs_may_alias_p): Do not
+ treat arrays with same type as objects that cannot overlap.
+
2016-12-01 Georg-Johann Lay <avr@gjlay.de>
* config/avr/avr.c (avr_print_operand): Use SYMBOL_REF_P if possible.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ab55b438fcc4..447d9fb4b4d4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2016-12-01 Richard Biener <rguenther@suse.de>
+
+ * gcc.dg/torture/alias-2.c: New testcase.
+
2016-12-01 Georg-Johann Lay <avr@gjlay.de>
* gcc.target/avr/tiny-memx.c: Only perform if target avr_tiny.
diff --git a/gcc/testsuite/gcc.dg/torture/alias-2.c b/gcc/testsuite/gcc.dg/torture/alias-2.c
new file mode 100644
index 000000000000..329d46a5eb9d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/alias-2.c
@@ -0,0 +1,17 @@
+/* { dg-do run } */
+
+/* We do not want to treat int[3] as an object that cannot overlap
+ itself but treat it as arbitrary sub-array of a larger array object. */
+int ar1(int (*p)[3], int (*q)[3])
+{
+ (*p)[0] = 1;
+ (*q)[1] = 2;
+ return (*p)[0];
+}
+int main()
+{
+ int a[4];
+ if (ar1 ((int (*)[3])&a[1], (int (*)[3])&a[0]) != 2)
+ __builtin_abort ();
+ return 0;
+}
--
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