From: Rich Felker <dalias@libc.org>
To: Jens Gustedt <Jens.Gustedt@inria.fr>
Cc: musl@lists.openwall.com
Subject: Re: [musl] [C23 128 bit 4/4] C23: implement proper support for int128_t and uint128_t
Date: Wed, 31 May 2023 10:27:44 -0400 [thread overview]
Message-ID: <20230531142743.GB4163@brightrain.aerifal.cx> (raw)
In-Reply-To: <1c8e850ed3190af39b9e3f501d79899d438e7292.1685536608.git.Jens.Gustedt@inria.fr>
On Wed, May 31, 2023 at 04:15:50PM +0200, Jens Gustedt wrote:
> By implementing support for w128 length specifiers for printf and
> scanf, the only final bit that we need to be able to support these
> types officially as extended integer type and map them to the
> fixed-width types are the integer literals. In C23, the new types
> `_IntBit(N)` and their literals are mandatory. Most commonly they will
> support N >= 128. The maximum value for N can be queried with
> `BITINT_MAXWIDTH`. If we have such literals, use them to construct the
> constants for `[U]INT128_C` and provide the rest of the macros for
> these types.
Unless the rules in C23 changed, I don't think yoou can define uintN_t
where N is larger than width of intmax_t; these can only be accessible
as _BitInt types not intN_t. (This was the whole reason _BitInt was
added, no?)
Rich
next prev parent reply other threads:[~2023-05-31 14:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-31 14:15 [musl] [C23 128 bit 0/4] implement the library part of 128 bit support Jens Gustedt
2023-05-31 14:15 ` [musl] [C23 128 bit 1/4] add an emulation for 128 bit arithmetic as needed for C library support Jens Gustedt
2023-05-31 14:15 ` [musl] [C23 128 bit 2/4] C23: implement w128 and wf128 support for printf Jens Gustedt
2023-05-31 14:15 ` [musl] [C23 128 bit 3/4] C23: implement w128 and wf128 for scanf and similar Jens Gustedt
2023-05-31 14:15 ` [musl] [C23 128 bit 4/4] C23: implement proper support for int128_t and uint128_t Jens Gustedt
2023-05-31 14:27 ` Rich Felker [this message]
2023-05-31 14:29 ` Rich Felker
2023-05-31 14:36 ` Jₑₙₛ Gustedt
2023-05-31 14:41 ` Rich Felker
2023-05-31 14:55 ` Jₑₙₛ Gustedt
2023-05-31 14:57 ` Rich Felker
2023-05-31 15:07 ` Jₑₙₛ Gustedt
2023-05-31 15:14 ` Rich Felker
2023-05-31 15:37 ` Jₑₙₛ Gustedt
2023-05-31 15:40 ` Rich Felker
2023-05-31 15:56 ` Jₑₙₛ Gustedt
2023-05-31 16:30 ` Alexander Monakov
2023-05-31 16:58 ` Jens Gustedt
2023-05-31 17:03 ` Rich Felker
2023-05-31 17:09 ` Alexander Monakov
2023-06-01 7:24 ` Jₑₙₛ Gustedt
2023-05-31 14:42 ` Jₑₙₛ Gustedt
2023-05-31 14:47 ` Rich Felker
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