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.c-torture/execute/pr20100-1.c | 76 +++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 gcc/testsuite/gcc.c-torture/execute/pr20100-1.c

(limited to 'gcc/testsuite/gcc.c-torture/execute/pr20100-1.c')

diff --git a/gcc/testsuite/gcc.c-torture/execute/pr20100-1.c b/gcc/testsuite/gcc.c-torture/execute/pr20100-1.c
new file mode 100644
index 000000000..8782edcd8
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr20100-1.c
@@ -0,0 +1,76 @@
+/* PR tree-optimization/20100
+   Pure function being treated as const.
+   Author: Hans-Peter Nilsson.  */
+
+static unsigned short g = 0;
+static unsigned short p = 0;
+unsigned char e;
+
+static unsigned short
+next_g (void)
+{
+  return g == e - 1 ? 0 : g + 1;
+}
+
+static unsigned short
+curr_p (void)
+{
+  return p;
+}
+
+static unsigned short
+inc_g (void)
+{
+  return g = next_g ();
+}
+
+static unsigned short
+curr_g (void)
+{
+  return g;
+}
+
+static char
+ring_empty (void)
+{
+  if (curr_p () == curr_g ())
+    return 1;
+  else
+    return 0;
+}
+
+char
+frob (unsigned short a, unsigned short b)
+{
+  g = a;
+  p = b;
+  inc_g ();
+  return ring_empty ();
+}
+
+unsigned short
+get_n (void)
+{
+  unsigned short n = 0;
+  unsigned short org_g;
+  org_g = curr_g ();
+  while (!ring_empty () && n < 5)
+    {
+      inc_g ();
+      n++;
+    }
+
+  return n;
+}
+
+void abort (void);
+void exit (int);
+int main (void)
+{
+  e = 3;
+  if (frob (0, 2) != 0 || g != 1 || p != 2 || e != 3
+      || get_n () != 1
+      || g != 2 || p != 2)
+    abort ();
+  exit (0);
+}
-- 
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