[opus] [RFC PATCH v1] arm: kf_bfly4: Introduce ARM neon intrinsics

Timothy B. Terriberry tterribe at xiph.org
Fri Nov 14 13:00:10 PST 2014

Viswanath Puttagunta wrote:
> a. Will the approach of enabling this optimization using
> --enable-armv7-neon-float or similar flag be acceptable to begin with?
> or
> b. Should the "AS_IF([test x"${enable_asm}" = x"yes"]".. section in
> configure.ac be re-written?

Automatic detection of compiler support in configure (in addition to 
run-time checks) would be preferable.

We used a manual switches for, e.g., the SSE 4.2 intrinsics, just 
because the submitted auto-detection code was not very reliable, and no 
one has written anything better yet.

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