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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/97715] [11 Regression] ICE in insn_default_length, at config/i386/i386.md:15325 since r11-4578-gd10f3e900b0377b4
Date: Wed, 04 Nov 2020 15:45:37 +0000 [thread overview]
Message-ID: <bug-97715-4-pQ0LpB39Vp@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-97715-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97715
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to qinzhao from comment #5)
> (In reply to H.J. Lu from comment #2)
> > (In reply to qinzhao from comment #1)
> > > for -fzero-call-used-regs=all, when zeroing st/mm registers under x87 exit
> > > mode, However, command line option force no 80387 mode, the following insn
> > > generated to zero st registers is not recognized:
> > >
> > > (insn 27 67 28 2 (set (reg:XF 8 st)
> > > (const_double:XF 0.0 [0x0.0p+0])) "zero-scratch-regs-10.c":8:1 -1
> > > (nil))
> >
> > You should avoid zeroing fixed registers.
>
> fixed registers should already be excluded from zeroing.
> are ST registers considered FIXED registers when -mno-80387 is specified?
They used to be, but now they are cleared from accessible_reg_set.
/* If the FPU is disabled, disable the registers. */
if (! (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387))
accessible_reg_set &= ~reg_class_contents[FLOAT_REGS];
next prev parent reply other threads:[~2020-11-04 15:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-04 14:11 [Bug target/97715] New: " marxin at gcc dot gnu.org
2020-11-04 14:11 ` [Bug target/97715] " marxin at gcc dot gnu.org
2020-11-04 15:19 ` qinzhao at gcc dot gnu.org
2020-11-04 15:21 ` hjl.tools at gmail dot com
2020-11-04 15:32 ` jakub at gcc dot gnu.org
2020-11-04 15:35 ` jakub at gcc dot gnu.org
2020-11-04 15:41 ` qinzhao at gcc dot gnu.org
2020-11-04 15:44 ` qinzhao at gcc dot gnu.org
2020-11-04 15:45 ` ubizjak at gmail dot com [this message]
2020-11-04 15:50 ` jakub at gcc dot gnu.org
2020-11-04 15:55 ` ubizjak at gmail dot com
2020-11-04 15:59 ` qing.zhao at oracle dot com
2020-11-04 16:04 ` jakub at gcc dot gnu.org
2020-11-04 16:08 ` ubizjak at gmail dot com
2020-11-04 16:09 ` qing.zhao at oracle dot com
2020-11-04 16:10 ` ubizjak at gmail dot com
2020-11-04 16:15 ` jakub at gcc dot gnu.org
2020-11-04 16:16 ` ubizjak at gmail dot com
2020-11-04 16:23 ` qing.zhao at oracle dot com
2020-11-04 17:48 ` jakub at gcc dot gnu.org
2020-11-04 18:09 ` jakub at gcc dot gnu.org
2020-11-04 18:39 ` qing.zhao at oracle dot com
2020-11-04 18:42 ` qing.zhao at oracle dot com
2020-11-04 20:07 ` qinzhao at gcc dot gnu.org
2020-11-05 8:56 ` marxin at gcc dot gnu.org
2020-11-05 14:58 ` cvs-commit at gcc dot gnu.org
2020-11-05 14:59 ` qinzhao at gcc dot gnu.org
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