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lavu/x86/lls: add fma3 optimizations for update_lls

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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>
This commit is contained in:
Ganesh Ajjanagadde
2016-01-13 17:59:26 -05:00
parent d4ce63a1bf
commit 5989add4ab
2 changed files with 61 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
libavutil/x86/lls_init.c
View File

@@ -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;
}
}