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, 30 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c
new file mode 100644
index 000000000..134fc3765
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-do run } */
+/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
+
+/* Test for predictive commoning of expressions, with reassociation.  */
+
+void abort (void);
+
+unsigned a[1000], b[1000], c[1000], d[1000];
+
+int main(void)
+{
+  unsigned i;
+
+  for (i = 0; i < 1000; i++)
+    a[i] = b[i] = d[i] = i;
+
+  for (i = 1; i < 998; i++)
+    c[i] = d[i + 1] * a[i + 2] * b[i + 1] - b[i - 1] * a[i] * d[i - 1];
+
+  for (i = 1; i < 998; i++)
+    if (c[i] != (i+1)*(i+2)*(i+1) - (i - 1) * i * (i - 1))
+      abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "Combination" 2 "pcom"} } */
+/* { dg-final { scan-tree-dump-times "Unrolling 3 times." 1 "pcom"} } */
+/* { dg-final { cleanup-tree-dump "pcom" } } */