From: "René Scharfe" <l.s.r@web.de>
To: Junio C Hamano <gitster@pobox.com>
Cc: Git List <git@vger.kernel.org>
Subject: Re: [PATCH 1/3] do full type check in COPY_ARRAY and MOVE_ARRAY
Date: Sun, 1 Jan 2023 13:32:11 +0100 [thread overview]
Message-ID: <269d85de-1448-0198-8251-9af898fedc67@web.de> (raw)
In-Reply-To: <xmqqzgb2fo8g.fsf@gitster.g>
Am 01.01.23 um 13:11 schrieb Junio C Hamano:
> René Scharfe <l.s.r@web.de> writes:
>
>> On second thought, what do we gain by using __builtin_types_compatible_p
>> here? Does it catch cases that the assignment check plus the element
>> size check wouldn't?
>
> I was reacting to this part of an earlier message in the thread:
>
> Presumably we cannot catch
>
> int *ip;
> unsigned *up;
>
> (0 ? (*(ip) = *(up), 0) : 0);
> (0 ? (*(up) = *(ip), 0) : 0);
>
> with the approach?
>
> i.e. *ip and *up are of the same size. Would the assignment check
> trigger?
Ah, right, __builtin_types_compatible_p returns 0 in this case and an
assignment is silently allowed.
René
next prev parent reply other threads:[~2023-01-01 12:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-30 21:51 [PATCH 0/3] COPY_ARRAY, MOVE_ARRAY, DUP_ARRAY René Scharfe
2022-12-30 21:56 ` [PATCH 1/3] do full type check in COPY_ARRAY and MOVE_ARRAY René Scharfe
2023-01-01 3:03 ` Junio C Hamano
2023-01-01 3:59 ` Junio C Hamano
2023-01-01 7:41 ` René Scharfe
2023-01-01 10:45 ` René Scharfe
2023-01-01 12:11 ` Junio C Hamano
2023-01-01 12:32 ` René Scharfe [this message]
2023-01-01 12:46 ` Junio C Hamano
2022-12-30 22:02 ` [PATCH 2/3] add DUP_ARRAY René Scharfe
2022-12-30 22:03 ` [PATCH 3/3] use DUP_ARRAY René Scharfe
2023-01-01 21:05 ` [PATCH v2 0/4] COPY_ARRAY, MOVE_ARRAY, DUP_ARRAY René Scharfe
2023-01-01 21:08 ` [PATCH v2 1/4] factor out BARF_UNLESS_COPYABLE René Scharfe
2023-01-01 21:11 ` [PATCH v2 2/4] do full type check in BARF_UNLESS_COPYABLE René Scharfe
2023-01-08 7:28 ` Junio C Hamano
2023-01-08 10:10 ` René Scharfe
2023-01-09 4:27 ` Junio C Hamano
2023-01-09 18:08 ` Jeff Hostetler
2023-01-01 21:14 ` [PATCH v2 3/4] add DUP_ARRAY René Scharfe
2023-01-01 21:16 ` [PATCH v2 4/4] use DUP_ARRAY René Scharfe
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