Remove the paragraph about writing to the Free Software Foundation's
mailing address. The FSF has changed addresses in the past, and may do
so again. In 2021 this is not useful, let's rather have a bit less
boilerplate at the start of source files.
The ARM and the X86 implementation of the conversion functions share
the same, non cpu specific implementation in separate files.
This commit removes the code duplication by putting the generic
implementation into a convert_base.c, similar to to convolve_base.c
Similar to the existing Intel SSE cases, add support for NEON vector
floating point SIMD processing. In this case, use ARM assembly
directly as the NEON intrinsics do not generate preferential code
Currently support NEON vectorized convolution and floating point
Signed-off-by: Thomas Tsou <firstname.lastname@example.org>