From: Segher Boessenkool <segher@kernel.crashing.org>
To: Henri Cloetens <henri.cloetens@blueice.be>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Issue during combine.
Date: Mon, 19 Oct 2020 16:20:37 -0500 [thread overview]
Message-ID: <20201019212037.GV2672@gate.crashing.org> (raw)
In-Reply-To: <7eb8f9b2-1960-634e-7f62-6dfc35077ff5@blueice.be>
On Mon, Oct 19, 2020 at 09:56:04PM +0200, Henri Cloetens wrote:
> - However, during the "checking", the combiner calls "simplify_subreg"
> in simplify-rtx.c.
> - There, it crashes on "/gcc_assert(innermode != VOIDmode)/.
Because that is invalid RTL.
> /(insn 2354 2352 1743 175 (set (reg/v:SI 197 [ dig ])//
> // (if_then_else (eq (subreg:QI (reg:SI 632) 1)//
> // (const_int 1 [0x1]))//
> // (reg:SI 708)//
> // (reg/v:SI 197 [ dig ])))
This is incorrect already (should be if_then_else:SI). It could have
crashed earlier... You can configure with "--enable-checking=yes,rtl"
to find many such problems (default is just "yes", see the manual for
other things you can ask to be checked ("tree" is useful; some others
are very very slow)).
HtH,
Segher
next prev parent reply other threads:[~2020-10-19 21:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 12:53 Henri Cloetens
2020-10-19 15:55 ` Henri Cloetens
2020-10-19 19:28 ` Segher Boessenkool
2020-10-19 19:56 ` Henri Cloetens
2020-10-19 21:20 ` Segher Boessenkool [this message]
2020-10-20 13:19 ` Richard Earnshaw
2020-10-20 15:01 ` Henri Cloetens
2020-10-20 15:48 ` Segher Boessenkool
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