From: Jeff King <peff@peff.net>
To: Paul Smith <paul@mad-scientist.net>
Cc: git@vger.kernel.org
Subject: Re: [ANNOUNCE] Git v2.19.0-rc0
Date: Wed, 22 Aug 2018 11:23:06 -0400 [thread overview]
Message-ID: <20180822152306.GC32630@sigill.intra.peff.net> (raw)
In-Reply-To: <814549a01074e89a4b26cb0cf13e4dddeb3a040a.camel@mad-scientist.net>
On Wed, Aug 22, 2018 at 08:42:20AM -0400, Paul Smith wrote:
> On Tue, 2018-08-21 at 23:03 -0400, Jeff King wrote:
> > static inline int hashcmp(const unsigned char *sha1, const unsigned
> > char *sha2)
> > {
> > + assert(the_hash_algo->rawsz == 20);
> > return memcmp(sha1, sha2, the_hash_algo->rawsz);
> > }
>
> I'm not familiar with Git code, but for most environments assert() is a
> macro which is compiled out when built for "release mode" (whatever
> that might mean). If that's the case for Git too, then relying on
> assert() to provide a side-effect (even an optimizer hint side-effect)
> won't work and this will actually get slower when built for "release
> mode".
>
> Just a thought...
We don't have such a "release mode" in Git, though of course people may
pass -DNDEBUG to the compiler if they want.
However, to me how we spell the assert is mostly orthogonal to the
discussion. We can do "if (...) BUG(...)" to get a guaranteed-present
conditional. The bigger questions are:
- are we OK with such an assertion; and
- does the assertion still give us the desired behavior when we add in
a branch for rawsz==32?
And I think the answers for those are both "probably not".
-Peff
next prev parent reply other threads:[~2018-08-22 15:23 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 22:13 [ANNOUNCE] Git v2.19.0-rc0 Junio C Hamano
2018-08-20 22:41 ` Stefan Beller
2018-08-20 23:39 ` Jonathan Nieder
2018-08-21 0:27 ` Jonathan Nieder
2018-08-21 0:46 ` Stefan Beller
2018-08-21 20:41 ` Derrick Stolee
2018-08-21 21:29 ` Jeff King
2018-08-22 0:48 ` brian m. carlson
2018-08-22 3:03 ` Jeff King
2018-08-22 3:36 ` Jeff King
2018-08-22 11:11 ` Derrick Stolee
2018-08-22 5:36 ` brian m. carlson
2018-08-22 6:07 ` Jeff King
2018-08-22 7:39 ` Ævar Arnfjörð Bjarmason
2018-08-22 11:14 ` Derrick Stolee
2018-08-22 15:17 ` Jeff King
2018-08-22 16:08 ` Duy Nguyen
2018-08-22 16:14 ` Duy Nguyen
2018-08-22 16:26 ` Jeff King
2018-08-22 16:49 ` Derrick Stolee
2018-08-22 16:58 ` Duy Nguyen
2018-08-22 17:04 ` Derrick Stolee
2018-08-22 16:59 ` Jeff King
2018-08-22 17:02 ` Junio C Hamano
2018-08-22 15:14 ` Jeff King
2018-08-22 14:28 ` Derrick Stolee
2018-08-22 15:24 ` Jeff King
2018-08-22 12:42 ` Paul Smith
2018-08-22 15:23 ` Jeff King [this message]
2018-08-23 1:23 ` Jonathan Nieder
2018-08-23 2:16 ` Jeff King
2018-08-23 2:27 ` Jonathan Nieder
2018-08-23 5:02 ` Jeff King
2018-08-23 5:09 ` brian m. carlson
2018-08-23 5:10 ` Jonathan Nieder
2018-08-23 13:20 ` Junio C Hamano
2018-08-23 16:31 ` wide t/perf output, was " Jeff King
2018-08-23 3:47 ` brian m. carlson
2018-08-23 5:04 ` Jeff King
2018-08-23 10:26 ` Derrick Stolee
2018-08-23 13:16 ` Junio C Hamano
2018-08-23 16:14 ` Jeff King
2018-08-23 23:30 ` Jacob Keller
2018-08-23 23:40 ` Jeff King
2018-08-24 0:06 ` Jeff King
2018-08-24 0:16 ` Jeff King
2018-08-24 2:48 ` Jacob Keller
2018-08-24 2:59 ` Jeff King
2018-08-24 6:45 ` Jeff King
2018-08-24 11:04 ` Derrick Stolee
2018-08-27 19:36 ` Junio C Hamano
2018-08-23 18:53 ` Jeff King
2018-08-23 20:59 ` Derrick Stolee
2018-08-24 6:56 ` Jeff King
2018-08-24 7:57 ` Ævar Arnfjörð Bjarmason
2018-08-24 16:45 ` Derrick Stolee
2018-08-25 8:26 ` Jeff King
2018-09-02 18:53 ` Kaartic Sivaraam
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