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Message-ID: <20230531164254.7a867552@inria.fr>
Date: Wed, 31 May 2023 16:42:54 +0200
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [C23 128 bit 4/4] C23: implement proper support for
int128_t and uint128_t
Rich,
on Wed, 31 May 2023 10:27:44 -0400 you (Rich Felker <dalias@...c.org>)
wrote:
> (This was the whole reason _BitInt was added, no?)
No, not at all. These are added to have
- types for any width, not only multiples of 8
- potentially have types that have thousands of bits (clang seems to
be keen to do so)
- types that have different rules for conversions, in particular no promotion.
These are explicitly not allowed to be used for the [u]intXXX_t types.
They only appear in the patches I propose as a means to encode number
literals of the appropriate width. These are used with casts, such
that they end up with the correct types.
Thanks
Jₑₙₛ
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