[Bug tree-optimization/84777] -Os inhibits all vectorization

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84777

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, patch can't help.  Instead try the following which should make the omp
simd
case work.

Index: gcc/tree-ssa-loop-ch.c
===================================================================
--- gcc/tree-ssa-loop-ch.c      (revision 258380)
+++ gcc/tree-ssa-loop-ch.c      (working copy)
@@ -57,7 +57,8 @@ should_duplicate_loop_header_p (basic_bl
      be true, since quite often it is possible to verify that the condition is
      satisfied in the first iteration and therefore to eliminate it.  Jump
      threading handles these cases now.  */
-  if (optimize_loop_for_size_p (loop))
+  if (optimize_loop_for_size_p (loop)
+      && !loop->force_vectorize)
     {
       if (dump_file && (dump_flags & TDF_DETAILS))
        fprintf (dump_file,