From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c | 60 ++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c

(limited to 'gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c')

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c b/gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c
new file mode 100644
index 000000000..19914cabf
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/prefetch-5.c
@@ -0,0 +1,60 @@
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-require-effective-target ilp32 } */
+/* { dg-options "-O2 --param min-insn-to-prefetch-ratio=5 -fprefetch-loop-arrays -march=athlon -fdump-tree-aprefetch-details" } */
+
+/* These are common idioms for writing variable-length arrays at the end
+   of structures.  We should not deduce anything about the number of iterations
+   of the loops from them.  */
+
+struct tail0
+{
+  int xxx;
+  int yyy[0];
+};
+
+int loop0 (int n, struct tail0 *x)
+{
+  int i, s = 0;
+
+  for (i = 0; i < n; i++)
+    s += x->yyy[i];
+
+  return s;
+}
+
+struct tail1
+{
+  int xxx;
+  int yyy[1];
+};
+int loop1 (int n, struct tail1 *x)
+{
+  int i, s = 0;
+
+  for (i = 0; i < n; i++)
+    s += x->yyy[i];
+
+  return s;
+}
+
+/* It is unlikely that this should be a tail array.  We may deduce that most
+   likely, the loop iterates about 5 times, and the array is not worth prefetching.  */
+
+struct tail5
+{
+  int xxx;
+  int yyy[5];
+};
+int loop5 (int n, struct tail5 *x)
+{
+  int i, s = 0;
+
+  for (i = 0; i < n; i++)
+    s += x->yyy[i];
+
+  return s;
+}
+
+/* { dg-final { scan-tree-dump-times "Issued prefetch" 2 "aprefetch" } } */
+/* { dg-final { scan-tree-dump-times "Not prefetching" 1 "aprefetch" } } */
+/* { dg-final { cleanup-tree-dump "aprefetch" } } */
-- 
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