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ffmpeg / libavcodec / x86 / lpc_mmx.c @ 2912e87a

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/*
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 * MMX optimized LPC DSP utils
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 * Copyright (c) 2007 Loren Merritt
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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/x86_cpu.h"
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#include "libavutil/cpu.h"
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#include "libavcodec/lpc.h"
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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(ff_pd_1)", %%xmm6     \n\t"
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        "movapd  "MANGLE(ff_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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         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(ff_pd_1)", %%xmm0 \n\t"
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                "movsd    "MANGLE(ff_pd_1)", %%xmm1 \n\t"
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                "movsd    "MANGLE(ff_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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                :"memory"
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            );
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        } else {
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            __asm__ volatile(
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                "movsd    "MANGLE(ff_pd_1)", %%xmm0 \n\t"
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                "movsd    "MANGLE(ff_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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            );
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        }
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    }
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}
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av_cold void ff_lpc_init_x86(LPCContext *c)
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{
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    int mm_flags = av_get_cpu_flags();
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    if (mm_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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}