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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/112560] [14 Regression] ICE in try_combine on
 pr112494.c
Date: Mon, 11 Mar 2024 11:54:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112560

Uro=C5=A1 Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #56705|0                           |1
        is obsolete|                            |

--- Comment #5 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Created attachment 57666
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57666&action=3Dedit
Proposed v2 patch

New version of patch in testing.

This version handles change of the mode of CC reg outside comparison. Now we
scan the RTX and change the mode of the CC reg at the proper place. We are
guaranteed by find_single_use that cc_use_loc can be non-NULL only when exa=
ctly
one user follows the combined comparison.

In case of unsupported cc_use_insn combine will be undone. To avoid combine
failure, pushfl<mode>2 in i386.md is changed to accept all MODE_CC modes.=