diff options
| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-14 01:59:26 +0300 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-16 00:46:13 +0300 |
| commit | 5989add4ab4e8e4daa406a66319b0a3b3faaa73d (patch) | |
| tree | fa59b1ead68044bf0a10a9a75b3f112ee36b0a36 /libavutil/x86/lls_init.c | |
| parent | d4ce63a1bf2520be7015df78dd8b042abe456c23 (diff) | |
lavu/x86/lls: add fma3 optimizations for update_lls
This improves accuracy (very slightly) and speed for processors having
fma3.
Sample benchmark (fate flac-16-lpc-cholesky, Haswell):
old:
5993610 decicycles in ff_lpc_calc_coefs, 64 runs, 0 skips
5951528 decicycles in ff_lpc_calc_coefs, 128 runs, 0 skips
new:
5252410 decicycles in ff_lpc_calc_coefs, 64 runs, 0 skips
5232869 decicycles in ff_lpc_calc_coefs, 128 runs, 0 skips
Tested with FATE and --disable-fma3, also examined contents of
lavu/lls-test.
Reviewed-by: James Almer <jamrial@gmail.com>
Reviewed-by: Henrik Gramner <henrik@gramner.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavutil/x86/lls_init.c')
| -rw-r--r-- | libavutil/x86/lls_init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libavutil/x86/lls_init.c b/libavutil/x86/lls_init.c index 81f141cbeb..9f0d862b0e 100644 --- a/libavutil/x86/lls_init.c +++ b/libavutil/x86/lls_init.c @@ -25,6 +25,7 @@ void ff_update_lls_sse2(LLSModel *m, const double *var); void ff_update_lls_avx(LLSModel *m, const double *var); +void ff_update_lls_fma3(LLSModel *m, const double *var); double ff_evaluate_lls_sse2(LLSModel *m, const double *var, int order); av_cold void ff_init_lls_x86(LLSModel *m) @@ -38,4 +39,7 @@ av_cold void ff_init_lls_x86(LLSModel *m) if (EXTERNAL_AVX_FAST(cpu_flags)) { m->update_lls = ff_update_lls_avx; } + if (EXTERNAL_FMA3(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_AVXSLOW)) { + m->update_lls = ff_update_lls_fma3; + } } |