On Saturday, 29 March 2025 17:04:46 Eastern Daylight Time Jonathan Wakely via
Std-Proposals wrote:
> On what platform in existence today does a type that's at least 32 bits
> promote?

None. It would need to be a platform with an int probably of 64 bits, which
doesn't exist. A 36-bit int platform *probably* uses the 36-bit integer as the
"fast 32-bit" - if it has an exact 32-bit type, it's probably slower than the
native 36-bit.

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.

A gotcha with this is that std::mt19937, which is required by the standard to
use uint_fast32_t, is actually twice as big as it needs to be.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Principal Engineer - Intel DCAI Platform & System Engineering