From: Andre Vieira <andre.simoesdiasvieira@arm.com>
Date: Tue, 11 Jan 2022 15:52:59 +0000 (+0000)
Subject: [vect] PR103971, PR103977: Fix epilogue mode selection for autodetect only
X-Git-Tag: upstream/12.2.0~2174
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=016bd7523131b645bca5b5530c81ab5149922743;p=platform%2Fupstream%2Fgcc.git

[vect] PR103971, PR103977: Fix epilogue mode selection for autodetect only

gcc/ChangeLog:

	* tree-vect-loop.c (vect-analyze-loop): Handle scenario where target
	does not add autovectorize_vector_modes.
---

diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index 6ed2b5f..ba67de4 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -3023,7 +3023,9 @@ vect_analyze_loop (class loop *loop, vec_info_shared *shared)
      array may contain length-agnostic and length-specific modes.  Their
      ordering is not guaranteed, so we could end up picking a mode for the main
      loop that is after the epilogue's optimal mode.  */
-  mode_i = 1;
+  vector_modes[0] = autodetected_vector_mode;
+  mode_i = 0;
+
   bool supports_partial_vectors = partial_vectors_supported_p ();
   poly_uint64 first_vinfo_vf = LOOP_VINFO_VECT_FACTOR (first_loop_vinfo);