obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

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.

1 files changed, 51 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-1.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-1.c
new file mode 100644
index 000000000..16bd5c910
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-1.c
@@ -0,0 +1,51 @@
+/* { dg-do compile } */
+/* { dg-do run } */
+/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
+
+void abort (void);
+
+unsigned fib[1000];
+
+__attribute__ ((noinline))
+void count_fib(void)
+{
+  int i;
+
+  fib[0] = 0;
+  fib[1] = 1;
+  for (i = 2; i < 1000; i++)
+    fib[i] = (fib[i-1] + fib[i - 2]) & 0xffff;
+}
+
+unsigned avg[1000];
+
+__attribute__ ((noinline))
+void count_averages(int n)
+{
+  int i;
+
+  for (i = 1; i < n; i++)
+    avg[i] = (((unsigned long) fib[i - 1] + fib[i] + fib[i + 1]) / 3) & 0xffff;
+}
+
+int main(void)
+{
+  count_fib ();
+  count_averages (999);
+
+  if (fib[19] != 4181 || avg[19] != 4510)
+    abort ();
+
+  if (fib[999] != 162 || avg[998] != 21953)
+    abort ();
+
+  return 0;
+}
+
+/* Verify that both loops were transformed and unrolled.  */
+/* { dg-final { scan-tree-dump-times "Unrolling 2 times." 2 "pcom"} } */
+
+/* Also check that we undid the transformation previously made by PRE.  */
+/* { dg-final { scan-tree-dump-times "looparound ref" 1 "pcom"} } */
+
+/* { dg-final { cleanup-tree-dump "pcom" } } */