Date: Sun, 30 Mar 2025 09:06:54 -0400
On Sunday, 30 March 2025 04:29:12 Eastern Daylight Time Jonathan Wakely wrote:
> However, maybe Frederick is being fooled by the fact that the uint_fast32_t
> on x86-64 Linux is "unsigned long" - that is, the same type as uint64_t and
> uint_fast64_t. Someone decided that 64-bit on x86-64 was "faster" than
> 32-bit and now we're stuck with that ABI.
>
> Right, that's why I consider them mostly useless.
>
> But I don't see why that would have anything to do with promotion.
Frederick almost certainly used the wrong term. There is no promotion
involved: 32-to-64 bit is a conversion not a promotion, and uint_fast32_t is
already a 64-bit type.
> However, maybe Frederick is being fooled by the fact that the uint_fast32_t
> on x86-64 Linux is "unsigned long" - that is, the same type as uint64_t and
> uint_fast64_t. Someone decided that 64-bit on x86-64 was "faster" than
> 32-bit and now we're stuck with that ABI.
>
> Right, that's why I consider them mostly useless.
>
> But I don't see why that would have anything to do with promotion.
Frederick almost certainly used the wrong term. There is no promotion
involved: 32-to-64 bit is a conversion not a promotion, and uint_fast32_t is
already a 64-bit type.
-- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Principal Engineer - Intel DCAI Platform & System Engineering
Received on 2025-03-30 13:06:58