PR tree-optimization/48052

commit 05032b10839cf0498c992c819bf2358e86c22bb0
Author: amker <amker@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Tue Jun 2 10:19:18 2015 +0000

        PR tree-optimization/48052
        * cfgloop.h (struct control_iv): New.
        (struct loop): New field control_ivs.
        * tree-ssa-loop-niter.c : Include "stor-layout.h".
        (number_of_iterations_lt): Set no_overflow information.
        (number_of_iterations_exit): Init control iv in niter struct.
        (record_control_iv): New.
        (estimate_numbers_of_iterations_loop): Call record_control_iv.
        (loop_exits_before_overflow): New.  Interface factored out of
        scev_probably_wraps_p.
        (scev_probably_wraps_p): Factor loop niter related code into
        loop_exits_before_overflow.
        (free_numbers_of_iterations_estimates_loop): Free control ivs.
        * tree-ssa-loop-niter.h (free_loop_control_ivs): New.

        gcc/testsuite/ChangeLog
        PR tree-optimization/48052
        * gcc.dg/tree-ssa/scev-8.c: New.
        * gcc.dg/tree-ssa/scev-9.c: New.
        * gcc.dg/tree-ssa/scev-10.c: New.
        * gcc.dg/vect/pr48052.c: New.

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@224020 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 26 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/vect/pr48052.c b/gcc-4.9/gcc/testsuite/gcc.dg/vect/pr48052.c
new file mode 100644
index 000000000..c822ebd41
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/vect/pr48052.c
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3 -std=c99" } */
+
+int foo(int* A, int* B,  unsigned start, unsigned BS)
+{
+  int s;
+  for (unsigned k = start;  k < start + BS; k++)
+    {
+      s += A[k] * B[k];
+    }
+
+  return s;
+}
+
+int bar(int* A, int* B, unsigned BS)
+{
+  int s;
+  for (unsigned k = 0;  k < BS; k++)
+    {
+      s += A[k] * B[k];
+    }
+
+  return s;
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" } } */