Re: [PATCH] Add native windows on arm64 support

On Thu, Dec 01, 2022 at 05:53:47PM +0000, Niyas Sait wrote:
> I've attached a new revision of the patch (v4) and includes following
> changes,
>
> 1. Add support for meson build system
> 2. Extend MSVC scripts to handle ARM64 platform.
> 3. Add arm64 definition of spin_delay function.
> 4. Exclude arm_acle.h import with MSVC compiler.
>
> V3->V4: Add support for meson build system
> V2->V3: Removed ASLR enablement and rebased on master.
> V1->V2: Rebased on top of master

Thanks for the updated version. I have been looking at it closely and
it looks like it should be able to do the job (no arm64 machine for
Windows here, sigh).

I have one tiny comment about this part:

- USE_ARMV8_CRC32C_WITH_RUNTIME_CHECK => undef,
+ USE_ARMV8_CRC32C_WITH_RUNTIME_CHECK => 1,

Shouldn't we only enable this flag when we are under aarch64?
Similarly, I don't think that it is a good idea to switch on
USE_SSE42_CRC32C_WITH_RUNTIME_CHECK all the time. We should only set
it when building under x86 and x86_64.

I would also add your link [1] in s_lock.h.

[1]: https://learn.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics#BarrierRestrictions
--
Michael