Re: Some efforts to get rid of "long" in our codebase

On 06.11.25 21:06, David Rowley wrote:
> On Fri, 7 Nov 2025 at 07:33, Peter Eisentraut <peter@eisentraut.org> wrote:
>>
>> On 06.11.25 12:46, David Rowley wrote:
>>> 0002: MemSet / MemSetAligned macros. It's probably about time someone
>>> made these disappear, but that's likely for another thread with more
>>> research than I'd like to do here. I replaced "long" with "Size". I
>>> also considered "uintptr_t", but after some reading of the C standard,
>>> I settled on Size as it seems it's possible for platforms to exist
>>> where the pointer width is smaller than the processor's width. I
>>> suspect it might not matter for the platforms we support? Size could
>>> also be smaller than the processor's width, but I feel that's less
>>> likely.
>>
>> I think size_t/Size could be misleading here.  You're not measuring any
>> size, you're just chunking up the bytes to zero into something that we
>> thing the compiler or CPU can handle very efficiently.
>>
>> So in a sense, using long isn't wrong here.  It might well be the best
>> for this.  If there is an aversion to using any long at all, why not
>> long long.
> 
> The point in changing this was that long isn't a good fit as it's not
> 64-bit on 64-bit Windows. My aim is to find a type with a width the
> same as the processor's word size. long long tends to be 64-bit on
> 32-bit platforms, so doesn't seem a very good fit. Someone might argue
> that doesn't matter now since we no longer have 4-byte Datums, but
> IMO, this isn't any reason to make things even worse for 32-bit
> builds.

Yeah you're right.  If we cared a lot about MemSet's longevity, I would 
suggest making a new type for this, but that would leak into all users 
of c.h, so maybe not.

I do suggest some kind of comment, that we're using size_t as a 
convenient proxy for the most suitable chunk/step size for the platform, 
not to actually measure a size.