From: Junio C Hamano <gitster@pobox.com>
To: <rsbecker@nexbridge.com>
Cc: "'Taylor Blau'" <me@ttaylorr.com>,
"'Patrick Steinhardt'" <ps@pks.im>, <git@vger.kernel.org>,
"'Jeff King'" <peff@peff.net>,
"'Elijah Newren'" <newren@gmail.com>
Subject: Re: [PATCH v2 11/18] git-compat-util.h: introduce `u32_add()`
Date: Thu, 22 Jan 2026 09:07:40 -0800 [thread overview]
Message-ID: <xmqq4iodpodf.fsf@gitster.g> (raw)
In-Reply-To: <014c01dc8b46$7a2997b0$6e7cc710$@nexbridge.com> (rsbecker@nexbridge.com's message of "Wed, 21 Jan 2026 21:26:06 -0500")
<rsbecker@nexbridge.com> writes:
>>> This would let the caller handle the failure and is thus quite
>>> flexible, which results in the following code:
>>>
>>> if (!u64_mult(expected_size, (uint64_t)p->pack_size, &expected_size))
>>> die(_("overflow during fixed-point multiply (%"PRIu64" "
>>> "* %"PRIu64")"), expected_size, (uint64_t)p->pack_size);
>>
>>It does read quite cleanly, so I think I'm convinced.
>
> Are all of these changes endian-safe?
I do not think of any endian-ness issue around here; these "mult"
helpers are checking if the result would overflow using regular
division, without doing any funny byte-shuffling ourselves.
<git-compat-util.h> has definitions of unsigned_mult_overflows(),
and maximum_unsigned_value_of_type(), if you are curious.
next prev parent reply other threads:[~2026-01-22 17:07 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-06 20:30 [PATCH 00/17] midx: incremental MIDX/bitmap layer compaction Taylor Blau
2025-12-06 20:31 ` [PATCH 01/17] midx: mark `get_midx_checksum()` arguments as const Taylor Blau
2025-12-08 18:26 ` Patrick Steinhardt
2025-12-09 1:41 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 02/17] midx: split `get_midx_checksum()` by adding `get_midx_hash()` Taylor Blau
2025-12-08 18:25 ` Patrick Steinhardt
2025-12-09 1:42 ` Taylor Blau
2025-12-09 1:50 ` Taylor Blau
2025-12-09 6:27 ` Patrick Steinhardt
2026-01-13 22:46 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 03/17] builtin/multi-pack-index.c: make '--progress' a common option Taylor Blau
2025-12-06 20:31 ` [PATCH 04/17] git-multi-pack-index(1): remove non-existent incompatibility Taylor Blau
2025-12-06 20:31 ` [PATCH 05/17] git-multi-pack-index(1): align SYNOPSIS with 'git multi-pack-index -h' Taylor Blau
2025-12-06 20:31 ` [PATCH 06/17] t/t5319-multi-pack-index.sh: fix copy-and-paste error in t5319.39 Taylor Blau
2025-12-06 20:31 ` [PATCH 07/17] midx-write.c: don't use `pack_perm` when assigning `bitmap_pos` Taylor Blau
2025-12-08 18:26 ` Patrick Steinhardt
2025-12-09 1:59 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 08/17] midx-write.c: introduce `struct write_midx_opts` Taylor Blau
2025-12-08 18:26 ` Patrick Steinhardt
2025-12-09 2:04 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 09/17] midx: do not require packs to be sorted in lexicographic order Taylor Blau
2025-12-08 18:26 ` Patrick Steinhardt
2025-12-09 2:07 ` Taylor Blau
2025-12-09 2:11 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 10/17] git-compat-util.h: introduce `u32_add()` Taylor Blau
2025-12-08 18:27 ` Patrick Steinhardt
2025-12-09 2:13 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 11/17] midx-write.c: introduce `midx_pack_perm()` helper Taylor Blau
2025-12-06 20:31 ` [PATCH 12/17] midx-write.c: extract `fill_pack_from_midx()` Taylor Blau
2025-12-06 20:31 ` [PATCH 13/17] midx-write.c: enumerate `pack_int_id` values directly Taylor Blau
2025-12-08 18:27 ` Patrick Steinhardt
2025-12-09 2:14 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 14/17] midx-write.c: factor fanout layering from `compute_sorted_entries()` Taylor Blau
2025-12-06 20:31 ` [PATCH 15/17] t/helper/test-read-midx.c: plug memory leak when selecting layer Taylor Blau
2025-12-08 18:27 ` Patrick Steinhardt
2025-12-09 2:16 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 16/17] midx: implement MIDX compaction Taylor Blau
2025-12-09 7:21 ` Patrick Steinhardt
2026-01-13 23:32 ` Taylor Blau
2025-12-06 20:31 ` [PATCH 17/17] midx: enable reachability bitmaps during " Taylor Blau
2025-12-09 7:21 ` Patrick Steinhardt
2026-01-13 23:47 ` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 00/18] midx: incremental MIDX/bitmap layer compaction Taylor Blau
2026-01-14 19:54 ` [PATCH v2 01/18] midx: mark `get_midx_checksum()` arguments as const Taylor Blau
2026-01-14 19:54 ` [PATCH v2 02/18] midx: rename `get_midx_checksum()` to `midx_get_checksum_hash()` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 03/18] midx: introduce `midx_get_checksum_hex()` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 04/18] builtin/multi-pack-index.c: make '--progress' a common option Taylor Blau
2026-01-14 19:54 ` [PATCH v2 05/18] git-multi-pack-index(1): remove non-existent incompatibility Taylor Blau
2026-01-14 19:54 ` [PATCH v2 06/18] git-multi-pack-index(1): align SYNOPSIS with 'git multi-pack-index -h' Taylor Blau
2026-01-14 19:54 ` [PATCH v2 07/18] t/t5319-multi-pack-index.sh: fix copy-and-paste error in t5319.39 Taylor Blau
2026-01-14 19:54 ` [PATCH v2 08/18] midx-write.c: don't use `pack_perm` when assigning `bitmap_pos` Taylor Blau
2026-01-14 21:13 ` Junio C Hamano
2026-01-14 21:40 ` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 09/18] midx-write.c: introduce `struct write_midx_opts` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 10/18] midx: do not require packs to be sorted in lexicographic order Taylor Blau
2026-01-14 21:28 ` Junio C Hamano
2026-01-14 21:44 ` Taylor Blau
2026-01-27 7:34 ` Patrick Steinhardt
2026-02-24 18:47 ` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 11/18] git-compat-util.h: introduce `u32_add()` Taylor Blau
2026-01-14 21:49 ` Junio C Hamano
2026-01-14 22:03 ` Taylor Blau
2026-01-15 0:11 ` Taylor Blau
2026-01-21 8:51 ` Patrick Steinhardt
2026-01-21 23:55 ` Taylor Blau
2026-01-22 2:26 ` rsbecker
2026-01-22 17:07 ` Junio C Hamano [this message]
2026-02-23 13:49 ` Jeff King
2026-02-24 18:53 ` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 12/18] midx-write.c: introduce `midx_pack_perm()` helper Taylor Blau
2026-01-14 19:54 ` [PATCH v2 13/18] midx-write.c: extract `fill_pack_from_midx()` Taylor Blau
2026-01-14 19:54 ` [PATCH v2 14/18] midx-write.c: enumerate `pack_int_id` values directly Taylor Blau
2026-01-14 19:55 ` [PATCH v2 15/18] midx-write.c: factor fanout layering from `compute_sorted_entries()` Taylor Blau
2026-01-14 19:55 ` [PATCH v2 16/18] t/helper/test-read-midx.c: plug memory leak when selecting layer Taylor Blau
2026-01-14 19:55 ` [PATCH v2 17/18] midx: implement MIDX compaction Taylor Blau
2026-01-27 7:35 ` Patrick Steinhardt
2026-01-27 22:13 ` Taylor Blau
2026-01-14 19:55 ` [PATCH v2 18/18] midx: enable reachability bitmaps during " Taylor Blau
2026-02-20 22:24 ` [PATCH v2 00/18] midx: incremental MIDX/bitmap layer compaction Junio C Hamano
2026-02-23 14:08 ` Jeff King
2026-02-24 5:25 ` Taylor Blau
2026-02-24 18:59 ` [PATCH v3 00/17] " Taylor Blau
2026-02-24 18:59 ` [PATCH v3 01/17] midx: mark `get_midx_checksum()` arguments as const Taylor Blau
2026-02-24 18:59 ` [PATCH v3 02/17] midx: rename `get_midx_checksum()` to `midx_get_checksum_hash()` Taylor Blau
2026-02-24 18:59 ` [PATCH v3 03/17] midx: introduce `midx_get_checksum_hex()` Taylor Blau
2026-02-24 18:59 ` [PATCH v3 04/17] builtin/multi-pack-index.c: make '--progress' a common option Taylor Blau
2026-02-24 18:59 ` [PATCH v3 05/17] git-multi-pack-index(1): remove non-existent incompatibility Taylor Blau
2026-02-24 18:59 ` [PATCH v3 06/17] git-multi-pack-index(1): align SYNOPSIS with 'git multi-pack-index -h' Taylor Blau
2026-02-24 19:00 ` [PATCH v3 07/17] t/t5319-multi-pack-index.sh: fix copy-and-paste error in t5319.39 Taylor Blau
2026-02-24 19:00 ` [PATCH v3 08/17] midx-write.c: don't use `pack_perm` when assigning `bitmap_pos` Taylor Blau
2026-02-24 19:00 ` [PATCH v3 09/17] midx-write.c: introduce `struct write_midx_opts` Taylor Blau
2026-02-24 19:00 ` [PATCH v3 10/17] midx: do not require packs to be sorted in lexicographic order Taylor Blau
2026-02-24 19:00 ` [PATCH v3 11/17] midx-write.c: introduce `midx_pack_perm()` helper Taylor Blau
2026-02-24 19:00 ` [PATCH v3 12/17] midx-write.c: extract `fill_pack_from_midx()` Taylor Blau
2026-02-24 19:00 ` [PATCH v3 13/17] midx-write.c: enumerate `pack_int_id` values directly Taylor Blau
2026-02-24 19:00 ` [PATCH v3 14/17] midx-write.c: factor fanout layering from `compute_sorted_entries()` Taylor Blau
2026-02-24 19:00 ` [PATCH v3 15/17] t/helper/test-read-midx.c: plug memory leak when selecting layer Taylor Blau
2026-02-24 19:00 ` [PATCH v3 16/17] midx: implement MIDX compaction Taylor Blau
2026-02-24 19:00 ` [PATCH v3 17/17] midx: enable reachability bitmaps during " Taylor Blau
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