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From: Junio C Hamano <gitster@pobox.com>
To: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: git@vger.kernel.org,
	brian m. carlson <sandals@crustytoothpaste.net>,
	Collin Funk <collin.funk1@gmail.com>,
	"Kristoffer Haugsbakk" <kristofferhaugsbakk@fastmail.com>
Subject: Re: [PATCH v3 0/5] bswap.h: Rework ntohl handling
Date: Tue, 15 Jul 2025 14:52:01 -0700	[thread overview]
Message-ID: <xmqqple1f7ge.fsf@gitster.g> (raw)
In-Reply-To: <20250715191230.12081-1-sebastian@breakpoint.cc> (Sebastian Andrzej Siewior's message of "Tue, 15 Jul 2025 21:12:25 +0200")

Sebastian Andrzej Siewior <sebastian@breakpoint.cc> writes:

> this series continues the rework of the bswap32/64()/ nothl() handling. 
>
> I've been looking at recent compiler and they manage to recognize the
> manual shifting and use an optimize opcode if available. The ntohl
> version provided by glibc already provides an "optimized" version which
> makes an optimisation in git almost not needed.
> One of the motivation behind overwriting/ providing an optimized
> version was to provide a macro instead of using a function call. One
> libc that is still providing ntohl as a function call is musl.
>
> While ntohl() is provided by the libc, the ntohll() is not. I found it
> only on Windows provided by winsock.h.
>
> I haven't touched the put/get_be*() macros. gcc & clang are both smart
> enough to swap the content accordingly and perform a single store/ load.
> Only the msvc seems to strugle here and performs multiple bytes stores/
> loads and shifts.
>
> v2…v3 https://lore.kernel.org/all/20250611221444.1567638-1-sebastian@breakpoint.cc/
>   - Fixed typos in the patch description

Thanks for updating the proposed log messages with typofixes.  I
understand the patch text has no changes?

Cc'ed those who gave comments on the previous round.  How does this
version look to you folks?

Thanks.

  parent reply	other threads:[~2025-07-15 21:52 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-15 19:12 [PATCH v3 0/5] bswap.h: Rework ntohl handling Sebastian Andrzej Siewior
2025-07-15 19:12 ` [PATCH v3 1/5] bswap.h: Add support for __BYTE_ORDER__ Sebastian Andrzej Siewior
2025-07-15 19:12 ` [PATCH v3 2/5] bswap.h: Define GIT_LITTLE_ENDIAN on msvc as little endian Sebastian Andrzej Siewior
2025-07-15 19:12 ` [PATCH v3 3/5] bswap.h: Always overwrite ntohl/ ntohll macros Sebastian Andrzej Siewior
2025-07-15 19:12 ` [PATCH v3 4/5] bswap.h: Remove optimized x86 version of bswap32/64 Sebastian Andrzej Siewior
2025-07-15 19:12 ` [PATCH v3 5/5] bswap.h: Provide a built-in based version of bswap32/64 if possible Sebastian Andrzej Siewior
2025-07-15 21:52 ` Junio C Hamano [this message]
2025-07-15 22:36   ` [PATCH v3 0/5] bswap.h: Rework ntohl handling brian m. carlson
2025-07-16  5:01   ` Sebastian Andrzej Siewior

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