Using Neon for float to int conversion, and introducing platform-
specific function for converting an array of float values to int16.
Also adding appropriate unit test.
Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>
The exp2 function was approximated using lolremez, achieving an
accuracy of less than 2*10^-7 within the range of 0 to 1.
Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>
The log2 function was approximated using lolremez, achieving an
accuracy of less than 1.4*10^-8 within the range of 1 to 2.
Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>
We used the SSE reciprocal square root instruction to vectorize the serch rather
than compare one at a time with multiplies. Speeds up the entire encoder by 8-10%.
Optimize opus encode (float only) usecase using ARM NE10
library. Mainly effects opus_fft and ctl_mdct_forward
and related functions.
This optimization can be used for ARM CPUs that have NEON
VFP unit. This patch only enables optimizations for ARMv7.
Official ARM NE10 library page available at
http://projectne10.github.io/Ne10/
To enable this optimization, use
--enable-intrinsics --with-NE10=<install_prefix>
or
--enable-intrinsics --with-NE10-libraries=<NE10_lib_dir> --with-NE10-includes=<NE10_includes_dir>
Compile time checks made during configure process to make sure
optimization option available only when compiler supports NEON
instrinsics.
Runtime checks made to make sure optimized functions only called
on appropriate hardware.
Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>
Optimize celt_pitch_xcorr function (for floating point)
using ARM NEON intrinsics for SoCs that have NEON VFP unit.
To enable this optimization, use --enable-intrinsics
configure option.
Compile time and runtime checks are also supported to make sure
this optimization is only enabled when the compiler supports
NEON intrinsics.
Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>
1. Only for fixed point on x86 platform (32bit and 64bit, uses SIMD
intrinsics up to SSE4.2)
2. Use "configure --enable-fixed-point --enable-intrinsics" to enable
optimization, default is disabled.
3. Official test cases are verified and passed.
Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>
Use the celt_mips defined in fixed_debug.h from the unit tests
by defining CELT_C earlier. We must export celt_mips so it can
be used by clients calling the library, like opus_custom_demo.
