mirror of
https://github.com/FFmpeg/FFmpeg.git
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163 lines
6.6 KiB
C
163 lines
6.6 KiB
C
/*
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* SIMD-optimized LPC functions
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* Copyright (c) 2007 Loren Merritt
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/mem.h"
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#include "libavutil/x86/asm.h"
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#include "libavutil/x86/cpu.h"
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#include "libavcodec/lpc.h"
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DECLARE_ASM_CONST(16, double, pd_1)[2] = { 1.0, 1.0 };
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DECLARE_ASM_CONST(16, double, pd_2)[2] = { 2.0, 2.0 };
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#if HAVE_SSE2_INLINE
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static void lpc_apply_welch_window_sse2(const int32_t *data, int len,
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double *w_data)
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{
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double c = 2.0 / (len-1.0);
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int n2 = len>>1;
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x86_reg i = -n2*sizeof(int32_t);
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x86_reg j = n2*sizeof(int32_t);
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__asm__ volatile(
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"movsd %4, %%xmm7 \n\t"
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"movapd "MANGLE(pd_1)", %%xmm6 \n\t"
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"movapd "MANGLE(pd_2)", %%xmm5 \n\t"
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"movlhps %%xmm7, %%xmm7 \n\t"
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"subpd %%xmm5, %%xmm7 \n\t"
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"addsd %%xmm6, %%xmm7 \n\t"
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"test $1, %5 \n\t"
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"jz 2f \n\t"
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#define WELCH(MOVPD, offset)\
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"1: \n\t"\
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"movapd %%xmm7, %%xmm1 \n\t"\
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"mulpd %%xmm1, %%xmm1 \n\t"\
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"movapd %%xmm6, %%xmm0 \n\t"\
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"subpd %%xmm1, %%xmm0 \n\t"\
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"pshufd $0x4e, %%xmm0, %%xmm1 \n\t"\
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"cvtpi2pd (%3,%0), %%xmm2 \n\t"\
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"cvtpi2pd "#offset"*4(%3,%1), %%xmm3 \n\t"\
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"mulpd %%xmm0, %%xmm2 \n\t"\
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"mulpd %%xmm1, %%xmm3 \n\t"\
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"movapd %%xmm2, (%2,%0,2) \n\t"\
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MOVPD" %%xmm3, "#offset"*8(%2,%1,2) \n\t"\
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"subpd %%xmm5, %%xmm7 \n\t"\
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"sub $8, %1 \n\t"\
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"add $8, %0 \n\t"\
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"jl 1b \n\t"\
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WELCH("movupd", -1)
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"jmp 3f \n\t"
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"2: \n\t"
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WELCH("movapd", -2)
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"3: \n\t"
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:"+&r"(i), "+&r"(j)
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:"r"(w_data+n2), "r"(data+n2), "m"(c), "r"(len)
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NAMED_CONSTRAINTS_ARRAY_ADD(pd_1,pd_2)
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XMM_CLOBBERS_ONLY("%xmm0", "%xmm1", "%xmm2", "%xmm3",
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"%xmm5", "%xmm6", "%xmm7")
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);
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#undef WELCH
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}
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static void lpc_compute_autocorr_sse2(const double *data, int len, int lag,
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double *autoc)
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{
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int j;
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if((x86_reg)data & 15)
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data++;
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for(j=0; j<lag; j+=2){
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x86_reg i = -len*sizeof(double);
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if(j == lag-2) {
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__asm__ volatile(
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"movsd "MANGLE(pd_1)", %%xmm0 \n\t"
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"movsd "MANGLE(pd_1)", %%xmm1 \n\t"
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"movsd "MANGLE(pd_1)", %%xmm2 \n\t"
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"1: \n\t"
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"movapd (%2,%0), %%xmm3 \n\t"
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"movupd -8(%3,%0), %%xmm4 \n\t"
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"movapd (%3,%0), %%xmm5 \n\t"
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"mulpd %%xmm3, %%xmm4 \n\t"
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"mulpd %%xmm3, %%xmm5 \n\t"
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"mulpd -16(%3,%0), %%xmm3 \n\t"
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"addpd %%xmm4, %%xmm1 \n\t"
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"addpd %%xmm5, %%xmm0 \n\t"
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"addpd %%xmm3, %%xmm2 \n\t"
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"add $16, %0 \n\t"
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"jl 1b \n\t"
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"movhlps %%xmm0, %%xmm3 \n\t"
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"movhlps %%xmm1, %%xmm4 \n\t"
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"movhlps %%xmm2, %%xmm5 \n\t"
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"addsd %%xmm3, %%xmm0 \n\t"
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"addsd %%xmm4, %%xmm1 \n\t"
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"addsd %%xmm5, %%xmm2 \n\t"
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"movsd %%xmm0, (%1) \n\t"
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"movsd %%xmm1, 8(%1) \n\t"
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"movsd %%xmm2, 16(%1) \n\t"
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:"+&r"(i)
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:"r"(autoc+j), "r"(data+len), "r"(data+len-j)
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NAMED_CONSTRAINTS_ARRAY_ADD(pd_1)
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:"memory"
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);
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} else {
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__asm__ volatile(
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"movsd "MANGLE(pd_1)", %%xmm0 \n\t"
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"movsd "MANGLE(pd_1)", %%xmm1 \n\t"
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"1: \n\t"
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"movapd (%3,%0), %%xmm3 \n\t"
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"movupd -8(%4,%0), %%xmm4 \n\t"
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"mulpd %%xmm3, %%xmm4 \n\t"
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"mulpd (%4,%0), %%xmm3 \n\t"
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"addpd %%xmm4, %%xmm1 \n\t"
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"addpd %%xmm3, %%xmm0 \n\t"
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"add $16, %0 \n\t"
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"jl 1b \n\t"
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"movhlps %%xmm0, %%xmm3 \n\t"
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"movhlps %%xmm1, %%xmm4 \n\t"
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"addsd %%xmm3, %%xmm0 \n\t"
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"addsd %%xmm4, %%xmm1 \n\t"
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"movsd %%xmm0, %1 \n\t"
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"movsd %%xmm1, %2 \n\t"
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:"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1])
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:"r"(data+len), "r"(data+len-j)
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NAMED_CONSTRAINTS_ARRAY_ADD(pd_1)
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);
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}
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}
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}
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#endif /* HAVE_SSE2_INLINE */
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av_cold void ff_lpc_init_x86(LPCContext *c)
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{
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#if HAVE_SSE2_INLINE
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int cpu_flags = av_get_cpu_flags();
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if (HAVE_SSE2_INLINE && cpu_flags & (AV_CPU_FLAG_SSE2 | AV_CPU_FLAG_SSE2SLOW)) {
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c->lpc_apply_welch_window = lpc_apply_welch_window_sse2;
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c->lpc_compute_autocorr = lpc_compute_autocorr_sse2;
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}
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#endif /* HAVE_SSE2_INLINE */
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}
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