[Bug middle-end/66916] New: [6 Regression] FAIL: gcc.target/arm/pr43920-2.c object-size text <= 54

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66916

            Bug ID: 66916
           Summary: [6 Regression] FAIL: gcc.target/arm/pr43920-2.c
                    object-size text <= 54
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
             Build: arm*

Created attachment 36006
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36006&action=edit
Failing assembly

After this commit I'm seeing the test fail on arm targets:

Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Jul 16 08:28:51 2015 +0000

    2015-07-16  Richard Biener  <rguenther@suse.de>

        * fold-const.c (fold_widened_comparison): Remove.
        (fold_sign_changed_comparison): Likewise.
        (fold_comparison): Move widened and sign-changed comparison
        simplification ...
        * match.pd: ... to patterns here.
        * generic-match-head.c: Include target.h.
        * gimple-match-head.c: Likewise.

        * gcc.dg/tree-ssa/pr21031.c: Adjust.


    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225861
138bc75d-0d04-0410-961f-82ee72b054a4


a sub+cmp sequence is not merged into a subs, causing the code size regression