Removes specializations for all() on AVX2 and SSE 4.1, which give the
wrong results if the ints didn't have all bits set (inconsistent with
other platforms and non-SIMD). Added a unit test that checks this case.
The mirror specializations for any() on AVX2 and SSE 4.1 are actually
valid, so added those, and added a 2 instruction specialization for
SSE for any() and all(). This is what clang-trunk produces on -O3, but
ToT clang struggles to vectorize it.
Also adds specializations for NEON for any() and all(), since even
clang-trunk was struggling to vectorize it automatically. In
particular, this will help skgpu::graphite::Rect's implementations of
intersect and contains, which use any/all to get a final boolean value.
In the Instruments app, I had see Rect's intersection as a hotspot
on the Mac M1, and this vectorization helps a bit.
Also takes the opportunity to remove fake C++14 constexpr for a
real constexpr.
Change-Id: Ib142e305ae5615056a777424e379b6da82d44f0c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/542296
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Herb Derby <herb@google.com>
4621ef2a8a