From: Richard Biener <rguenther@suse.de>
Date: Mon, 5 Jul 2021 09:53:07 +0000 (+0200)
Subject: middle-end/101291 - set loop copy of versioned loop
X-Git-Tag: releases/gcc-11.2.0~77
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5df86357becfc5c3a676b9f506bf2c1c625306f2;p=thirdparty%2Fgcc.git

middle-end/101291 - set loop copy of versioned loop

This fixes the vectorizer loop versioning code failing to clear
niter related info on the scalar loop as it assumed get_loop_copy
would work even for the outermost loop.  The patch makes that
assumption hold by adjusting the loop versioning code.

2021-07-05  Richard Biener  <rguenther@suse.de>

	PR middle-end/101291
	* cfgloopmanip.c (loop_version): Set the loop copy of the
	versioned loop to the new loop.

(cherry picked from commit 38872c6c0db1b10b17d3913b277c499913208d0b)
---

diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c
index 4a9ab74642c5..99a88b855e11 100644
--- a/gcc/cfgloopmanip.c
+++ b/gcc/cfgloopmanip.c
@@ -1733,6 +1733,7 @@ loop_version (class loop *loop,
 		   then_scale, else_scale);
 
   copy_loop_info (loop, nloop);
+  set_loop_copy (loop, nloop);
 
   /* loopify redirected latch_edge. Update its PENDING_STMTS.  */
   lv_flush_pending_stmts (latch_edge);