[PATCH] msvcrt: Avoid disallowed unaligned writes in memset on ARM

[Martin Storsjö]

On Thu, 16 Sep 2021, Martin Storsjö wrote:

> On Thu, 16 Sep 2021, Martin Storsjö wrote:
>
>> Clang doesn't seem to know/exploit that the regular 32 bit store 
>> instructions work unaligned though, so the smaller stores get exploded into 
>> a long series of single byte writes. But I guess that's just a missed 
>> optimization opportunity in Clang, I'll see if I can report it.
>
> FWIW this seems to be a target specific issue; Clang does optimize it 
> correctly for an armv7-linux-gnueabihf target, but not for armv7-windows. 
> I'll see about getting that fixed.

For the record, this should have been fixed in Clang now: 
https://reviews.llvm.org/D109960

// Martin