tree b5f4e4991a36f234b68be6d7c2b00d62d060f8e3
parent fe19714f8094a2b6d6dab0cdd3c32874d0ad66b9
author Antonio Sanchez <cantonios@google.com> 1614376786 -0800
committer Antonio Sanchez <cantonios@google.com> 1614377320 -0800

Fix NEON sqrt for 32-bit, add prsqrt.

With !406, we accidentally broke arm 32-bit NEON builds, since
`vsqrt_f32` is only available for 64-bit.

Here we add back the `rsqrt` implementation for 32-bit, relying
on a `prsqrt` implementation with better handling of edge cases.

Note that several of the 32-bit NEON packet tests are currently
failing - either due to denormal handling (NEON versions flush
to zero, but scalar paths don't) or due to accuracy (e.g. sin/cos).