From: Martin Jambor <mjambor@suse.cz>
Date: Fri, 29 Jan 2016 23:01:54 +0000 (+0100)
Subject: [PR 69355] Correct hole detection when total_scalarization fails
X-Git-Tag: releases/gcc-4.9.4~366
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=11137ab6e6352e7851768609f0826be49e75d629;p=thirdparty%2Fgcc.git

[PR 69355] Correct hole detection when total_scalarization fails

2016-01-29  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/69355
	* tree-sra.c (analyze_access_subtree): Correct hole detection when
	total_scalarization fails.

testsuite/
	* gcc.dg/tree-ssa/pr69355.c: New test.

From-SVN: r233001
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8db15316a69b..290dea6469cd 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-29  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/69355
+	* tree-sra.c (analyze_access_subtree): Correct hole detection when
+	total_scalarization fails.
+
 2016-01-29  Uros Bizjak  <ubizjak@gmail.com>
 
 	Backport from mainline
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 017c33fea393..c1ebd328a292 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-01-29  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/69355
+	* gcc.dg/tree-ssa/pr69355.c: New test.
+
 2016-01-29  Uros Bizjak  <ubizjak@gmail.com>
 
 	Backport from mainline
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr69355.c b/gcc/testsuite/gcc.dg/tree-ssa/pr69355.c
new file mode 100644
index 000000000000..f515c211c99b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr69355.c
@@ -0,0 +1,44 @@
+/* { dg-do run } */
+/* { dg-options "-O -fno-strict-aliasing" } */
+
+struct S
+{
+  void *a;
+  long double b;
+};
+
+struct Z
+{
+  long long l;
+  short s;
+} __attribute__((packed));
+
+struct S __attribute__((noclone, noinline))
+foo (void *v, struct Z *z)
+{
+  struct S t;
+  t.a = v;
+  *(struct Z *) &t.b = *z;
+  return t;
+}
+
+struct Z gz;
+
+int
+main (int argc, char **argv)
+{
+  struct S s;
+
+  if (sizeof (long double) < sizeof (struct Z))
+    return 0;
+
+  gz.l = 0xbeef;
+  gz.s = 0xab;
+
+  s = foo ((void *) 0, &gz);
+
+  if ((((struct Z *) &s.b)->l != gz.l)
+      || (((struct Z *) &s.b)->s != gz.s))
+    __builtin_abort ();
+  return 0;
+}
diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 4f9e80629676..03209f4f2d03 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -2295,7 +2295,7 @@ analyze_access_subtree (struct access *root, struct access *parent,
 
       if (covered_to < limit)
 	hole = true;
-      if (scalar)
+      if (scalar || !allow_replacements)
 	root->grp_total_scalarization = 0;
     }