re PR tree-optimization/84777 (-Os inhibits all vectorization)

2018-03-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84777
	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): For
	force-vectorize loops ignore whether we are optimizing for size.

From-SVN: r258444

gcc/ChangeLog

+2018-03-12  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/84777
+	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): For
+	force-vectorize loops ignore whether we are optimizing for size.
+
 2018-03-12  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* config/nds32/nds32.c (nds32_md_asm_adjust): New function.

gcc/tree-ssa-loop-ch.c

@@ -57,7 +57,8 @@ should_duplicate_loop_header_p (basic_block header, struct loop *loop,
      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,