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https://github.com/FFmpeg/FFmpeg.git
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54a51d3840
It now does 12 samples per iteration, up from 4. From 1.8 to 3.2 times faster again. 3.6 to 5.7 times faster overall. Runtime is reduced by a further 2 to 18%. Overall runtime reduced by 4 to 50%. Same conditions as before apply. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
102 lines
2.8 KiB
NASM
102 lines
2.8 KiB
NASM
;******************************************************************************
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;* FLAC DSP functions
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;*
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;* Copyright (c) 2014 James Darnley <james.darnley@gmail.com>
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;*
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;* This file is part of FFmpeg.
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;*
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;* FFmpeg is free software; you can redistribute it and/or modify
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;* it under the terms of the GNU General Public License as published by
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;* the Free Software Foundation; either version 2 of the License, or
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;* (at your option) any later version.
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;*
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;* FFmpeg is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;* GNU General Public License for more details.
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;*
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;* You should have received a copy of the GNU General Public License along
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;* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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;* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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SECTION_TEXT
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INIT_XMM sse4
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%if ARCH_X86_64
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cglobal flac_enc_lpc_16, 5, 7, 8, 0, res, smp, len, order, coefs
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DECLARE_REG_TMP 5, 6
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%define length r2d
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movsxd orderq, orderd
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%else
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cglobal flac_enc_lpc_16, 5, 6, 8, 0, res, smp, len, order, coefs
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DECLARE_REG_TMP 2, 5
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%define length r2mp
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%endif
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; Here we assume that the maximum order value is 32. This means that we only
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; need to copy a maximum of 32 samples. Therefore we let the preprocessor
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; unroll this loop and copy all 32.
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%assign iter 0
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%rep 32/(mmsize/4)
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movu m0, [smpq+iter]
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movu [resq+iter], m0
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%assign iter iter+mmsize
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%endrep
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lea resq, [resq+orderq*4]
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lea smpq, [smpq+orderq*4]
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lea coefsq, [coefsq+orderq*4]
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sub length, orderd
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movd m3, r5m
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neg orderq
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%define posj t0q
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%define negj t1q
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.looplen:
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pxor m0, m0
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pxor m4, m4
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pxor m6, m6
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mov posj, orderq
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xor negj, negj
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.looporder:
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movd m2, [coefsq+posj*4] ; c = coefs[j]
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SPLATD m2
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movu m1, [smpq+negj*4-4] ; s = smp[i-j-1]
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movu m5, [smpq+negj*4-4+mmsize]
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movu m7, [smpq+negj*4-4+mmsize*2]
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pmulld m1, m2
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pmulld m5, m2
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pmulld m7, m2
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paddd m0, m1 ; p += c * s
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paddd m4, m5
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paddd m6, m7
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dec negj
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inc posj
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jnz .looporder
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psrad m0, m3 ; p >>= shift
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psrad m4, m3
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psrad m6, m3
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movu m1, [smpq]
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movu m5, [smpq+mmsize]
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movu m7, [smpq+mmsize*2]
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psubd m1, m0 ; smp[i] - p
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psubd m5, m4
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psubd m7, m6
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movu [resq], m1 ; res[i] = smp[i] - (p >> shift)
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movu [resq+mmsize], m5
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movu [resq+mmsize*2], m7
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add resq, 3*mmsize
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add smpq, 3*mmsize
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sub length, (3*mmsize)/4
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jg .looplen
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RET
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