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Message-ID: <20230531142743.GB4163@brightrain.aerifal.cx>
Date: Wed, 31 May 2023 10:27:44 -0400
From: Rich Felker <dalias@...c.org>
To: Jens Gustedt <Jens.Gustedt@...ia.fr>
Cc: musl@...ts.openwall.com
Subject: Re: [C23 128 bit 4/4] C23: implement proper support for
int128_t and uint128_t
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
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