add CPU feature detection for iOS / ARM Mac
My reference was mostly `man 3 sysctl`.
I'm pretty sure 'neon_fp16' is the right bit for FP16 NEON compute and
'neon_hpfp' just mean's its got f32<->f16 instructions, but I could be
mixed up. It'll become extremely obvious once I start using that bit.
Bug: skia:11001
Change-Id: I8bb73aef71b750b766aa1d0e29878fd7a8e8d6da
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/339837
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed