From: Andreas Schwab <schwab@suse.de>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Lars Schneider" <larsxschneider@gmail.com>,
git@vger.kernel.org, "Marc Stevens" <marc@marc-stevens.nl>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: Unaligned accesses in sha1dc
Date: Thu, 01 Jun 2017 12:08:40 +0200 [thread overview]
Message-ID: <mvmmv9st3yv.fsf@suse.de> (raw)
In-Reply-To: <xmqqwp8w3uff.fsf@gitster.mtv.corp.google.com> (Junio C. Hamano's message of "Thu, 01 Jun 2017 18:53:56 +0900")
On Jun 01 2017, Junio C Hamano <gitster@pobox.com> wrote:
> Depending on the model of "ARM" (or "SPARC") emulated with QEMU, and
> depending on the OS that runs on such an "ARM" or "SPARC", we may
> not see this---if the emulated OS has the "software unaligned-access
> emulation" our userland may not see a SIGBUS.
Even if the architecture implements unaligned accesses in hardware, it
is still undefined behaviour, and the compiler will (eventually) take
advantage of it.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
next prev parent reply other threads:[~2017-06-01 10:08 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-01 8:28 Unaligned accesses in sha1dc Andreas Schwab
[not found] ` <CDB32E2C-48AF-4636-B921-4C45B614FD35@marc-stevens.nl>
2017-06-01 9:05 ` Andreas Schwab
2017-06-01 9:15 ` Junio C Hamano
2017-06-01 9:15 ` Andreas Schwab
2017-06-01 9:34 ` Junio C Hamano
2017-06-01 9:18 ` brian m. carlson
2017-06-01 9:32 ` Andreas Schwab
2017-06-01 9:21 ` Lars Schneider
2017-06-01 9:53 ` Junio C Hamano
2017-06-01 10:08 ` Andreas Schwab [this message]
2017-06-01 10:26 ` Martin Ågren
2017-06-01 10:33 ` Ævar Arnfjörð Bjarmason
2017-06-01 11:53 ` Martin Ågren
2017-06-01 15:57 ` Martin Ågren
2017-06-02 0:15 ` Junio C Hamano
2017-06-02 8:51 ` Ævar Arnfjörð Bjarmason
2017-06-02 9:49 ` Martin Ågren
2017-06-02 19:32 ` Ævar Arnfjörð Bjarmason
2017-06-02 20:11 ` Martin Ågren
2017-06-02 20:14 ` Ævar Arnfjörð Bjarmason
2017-06-02 20:25 ` demerphq
2017-06-02 20:17 ` demerphq
2017-06-02 20:38 ` Ævar Arnfjörð Bjarmason
2017-06-02 21:53 ` Linus Torvalds
2017-06-03 0:13 ` Junio C Hamano
2017-06-02 14:46 ` Liam R. Howlett
2017-06-02 16:53 ` Ævar Arnfjörð Bjarmason
2017-06-03 0:15 ` Junio C Hamano
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