On Tue, Feb 1, 2022 at 4:34 AM Klaus Post <klausp...@gmail.com> wrote:
>
> I looked through the source to see if `GOAMD64` version results in build tags
> being set, but I was unsure if that is the case.
>
> It would be really helpful for assembly code that can be assumed to work
> without cpuid checks, avoiding a bit of branching.
>
> For example adding goamd64_v1...goamd64_v4 tags depending on the version set
> at compile would be very helpful.
>
> Apologies if I missed it already existing.
Historically the go tool hasn't provided build tags for any of the
GO${GOARCH} environment variables. What it does do is define macros
that the assembler code can check using #ifdef. It will define
GOAMD64_vN where N is the value from the GOAMD64 environment variable
at build time. Perhaps that will be sufficient for your purposes.
Ian
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