From: Segher Boessenkool <segher@kernel.crashing.org>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Martin Sebor <msebor@gmail.com>,
Gcc Patch List <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] diagnose unsupported uses of hardware register variables (PR 88000)
Date: Wed, 14 Nov 2018 11:35:00 -0000 [thread overview]
Message-ID: <20181114113505.GW23873@gate.crashing.org> (raw)
In-Reply-To: <20181114094757.GO11625@tucnak>
On Wed, Nov 14, 2018 at 10:47:57AM +0100, Jakub Jelinek wrote:
> This makes no sense to me. There is nothing unsupported in passing
> a local hard register variable to a function, that is well defined,
> and as your testcase changes show, you broke quite some completely valid
> testcases with that.
What could perhaps be useful is a warning for a local register var that
is not used in any asm?
> What doesn't work as the reporter expect is assumption that local hard
> register variables that live across function calls must have their values
> preserved; they can be modified by the callees.
It would be really nice if we could fix that :-)
Segher
next prev parent reply other threads:[~2018-11-14 11:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 4:11 Martin Sebor
2018-11-14 9:39 ` Alexander Monakov
2018-11-15 22:34 ` Martin Sebor
2018-11-14 9:48 ` Jakub Jelinek
2018-11-14 11:35 ` Segher Boessenkool [this message]
2018-11-14 11:40 ` Jakub Jelinek
2018-11-14 11:50 ` Segher Boessenkool
2018-11-14 12:00 ` Jakub Jelinek
2018-11-14 12:11 ` Segher Boessenkool
2018-11-14 12:14 ` Jakub Jelinek
2018-11-15 18:31 ` Martin Sebor
2018-11-14 12:22 Segher Boessenkool
2018-11-14 12:27 ` Jakub Jelinek
2018-11-14 12:33 ` Alexander Monakov
2018-11-14 13:53 ` Segher Boessenkool
2018-11-14 15:50 ` Alexander Monakov
2018-11-14 17:47 ` Segher Boessenkool
2018-11-14 18:01 ` Alexander Monakov
2018-11-15 15:54 ` Michael Matz
2018-11-15 16:23 ` Alexander Monakov
2018-11-16 15:21 ` Michael Matz
2018-11-16 16:28 ` Alexander Monakov
2018-11-16 16:43 ` Michael Matz
2018-11-16 22:12 ` Segher Boessenkool
2018-11-19 12:59 ` Michael Matz
2018-11-19 17:18 ` Segher Boessenkool
2018-11-14 13:47 ` Segher Boessenkool
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