[gcc r14-68] Avoid unnecessary epilogues from tree_unroll_loop

[gcc r14-68] Avoid unnecessary epilogues from tree_unroll_loop

[Richard Biener]

https://gcc.gnu.org/g:01e79e21bbb2d10ecac784d383cefb88d2e20692

commit r14-68-g01e79e21bbb2d10ecac784d383cefb88d2e20692
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Mar 9 10:56:57 2023 +0100

    Avoid unnecessary epilogues from tree_unroll_loop
    
    The following fixes the condition determining whether we need an
    epilogue.
    
            * tree-ssa-loop-manip.cc (determine_exit_conditions): Fix
            no epilogue condition.

Diff:
---
 gcc/tree-ssa-loop-manip.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/tree-ssa-loop-manip.cc b/gcc/tree-ssa-loop-manip.cc
index 09acc1c94cc..4ef27bae515 100644
--- a/gcc/tree-ssa-loop-manip.cc
+++ b/gcc/tree-ssa-loop-manip.cc
@@ -1010,7 +1010,7 @@ determine_exit_conditions (class loop *loop, class tree_niter_desc *desc,
       /* Convert the latch count to an iteration count.  */
       tree niter = fold_build2 (PLUS_EXPR, type, desc->niter,
 				build_one_cst (type));
-      if (multiple_of_p (type, niter, bigstep))
+      if (multiple_of_p (type, niter, build_int_cst (type, factor)))
 	return;
     }