[FFmpeg-devel] [PATCH] ppc: configure: Support Power ISA 3.0

[Trung Lê]

On Thu, Apr 30, 2020 at 3:16 AM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> Shouldn't --disable-power8 also disable power9 (assuming there is a
> difference)?
>

No it should not. From my understanding, the `--enable-power8` flag is used
to determine if the version `altivec.h` supports the macro `_ARCH_PWR8` or
not:

```code
    if enabled power8; then
        check_cpp_condition power8 "altivec.h" "defined(_ARCH_PWR8)"
    fi
```

Thus --disable-power8 should have no effect on power9 flag because power9
uses a different `_ARCH_PWR9` macro.

The question is do we want to expose the `--disable-power[8|9]` flags?
Should the `--cpu=power[8|9]` flags implicitly perform the cpp condition
check?

Kind regards


>
> Carl Eugen
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".