From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 38EC53853830; Sat, 22 Jul 2023 20:55:50 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 38EC53853830
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1690059350;
	bh=tUCRyvlEweLGs7HAWFQdPL51nA4N8bC3irqqQnTTXrY=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=lnH2ZuFoVA8dXr0v5HvTHxlb9ud/i6kUkgwlljseiHH7f1JuiE70effXBTlxxJRbU
	 ql9cBJ+OOF1teiLvgBRDzdEIEn6LLDRYr4rjzWzqMKCbaI4bGS6FDyuDp6NhEnqyYW
	 xMqaPXfup6X/qGVBvZJfObIF2OKvjFHS8jRGIMOk=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110587] [14 regression] 96% pr28071.c compile
 time regression since r14-2337-g37a231cc7594d1
Date: Sat, 22 Jul 2023 20:55:47 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: compile-time-hog, ra
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: roger at nextmovesoftware dot com
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-110587-4-DkoOcGUilq@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110587-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110587-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110587

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:

https://gcc.gnu.org/g:8125b12f846b41f26e58c0fe3b218d654f65d1c8

commit r14-2730-g8125b12f846b41f26e58c0fe3b218d654f65d1c8
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Sat Jul 22 21:52:55 2023 +0100

    i386: Don't use insvti_{high,low}part with -O0 (for compile-time).

    This patch attempts to help with PR rtl-optimization/110587, a regressi=
on
    of -O0 compile time for the pathological pr28071.c.  My recent patch he=
lps
    a bit, but hasn't returned -O0 compile-time to where it was before my
    ix86_expand_move changes.  The obvious solution/workaround is to guard
    these new TImode parameter passing optimizations with "&& optimize", so
    they don't trigger when compiling with -O0.  The very minor complication
    is that "&& optimize" alone leads to the regression of pr110533.c, where
    our improved TImode parameter passing fixes a wrong-code issue with nak=
ed
    functions, importantly, when compiling with -O0.  This should explain
    the one line fix below "&& (optimize || ix86_function_naked (cfun))".

    I've an additional fix/tweak or two for this compile-time issue, but
    this change eliminates the part of the regression that I've caused.

    2023-07-22  Roger Sayle  <roger@nextmovesoftware.com>

    gcc/ChangeLog
            * config/i386/i386-expand.cc (ix86_expand_move): Disable the
            64-bit insertions into TImode optimizations with -O0, unless
            the function has the "naked" attribute (for PR target/110533).=