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