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

[Piotr Caban]

Hi Martin,

On 9/15/21 10:27 PM, Martin Storsjo wrote:
> ARM can do 64 bit writes with the STRD instruction, but that
> instruction requires a 32 bit aligned address - while these stores
> are unaligned.
>
> Two consecutive stores to uint32_t* pointers can also be fused
> into one single STRD, as a uint32_t* is supposed to be properly
> aligned - therefore, do these stores as stores to volatile uint32_t*
> to avoid fusing them.

How about letting the compiler know that the pointers are unaligned 
instead? Is attached patch working for you?

Thanks,
Piotr