annotate ffmpeg/libavcodec/mips/compute_antialias_float.h @ 13:844d341cf643 tip

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/*
 * Copyright (c) 2012
 *      MIPS Technologies, Inc., California.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Author:  Bojan Zivkovic ([e-mail])
 *
 * Compute antialias function optimised for MIPS floating-point architecture
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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
 */

/**
 * @file
 * Reference: libavcodec/mpegaudiodec.c
 */

#ifndef AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H
#define AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H

#if HAVE_INLINE_ASM
static void compute_antialias_mips_float(MPADecodeContext *s,
                                        GranuleDef *g)
{
    float *ptr, *ptr_end;
    float *csa = &csa_table[0][0];
    int n;
    /* temporary variables */
    float in1, in2, in3, in4, in5, in6, in7, in8;
    float out1, out2, out3, out4;

    ptr = g->sb_hybrid + 18;
    /* we antialias only "long" bands */
    if (g->block_type == 2) {
        if (!g->switch_point)
            return;
        /* XXX: check this for 8000Hz case */
        n = 1;
        ptr_end = ptr + 18;
    } else {
        n = 31;
        ptr_end = ptr + 558;
    }

    /**
    * instructions are scheduled to minimize pipeline stall.
    */

    __asm__ volatile (
        "compute_antialias_float_loop%=:                                \t\n"
        "lwc1    %[in1],  -1*4(%[ptr])                                  \t\n"
        "lwc1    %[in2],  0(%[csa])                                     \t\n"
        "lwc1    %[in3],  1*4(%[csa])                                   \t\n"
        "lwc1    %[in4],  0(%[ptr])                                     \t\n"
        "lwc1    %[in5],  -2*4(%[ptr])                                  \t\n"
        "lwc1    %[in6],  4*4(%[csa])                                   \t\n"
        "mul.s   %[out1], %[in1],  %[in2]                               \t\n"
        "mul.s   %[out2], %[in1],  %[in3]                               \t\n"
        "lwc1    %[in7],  5*4(%[csa])                                   \t\n"
        "lwc1    %[in8],  1*4(%[ptr])                                   \t\n"
        "nmsub.s %[out1], %[out1], %[in3], %[in4]                       \t\n"
        "madd.s  %[out2], %[out2], %[in2], %[in4]                       \t\n"
        "mul.s   %[out3], %[in5],  %[in6]                               \t\n"
        "mul.s   %[out4], %[in5],  %[in7]                               \t\n"
        "lwc1    %[in1],  -3*4(%[ptr])                                  \t\n"
        "swc1    %[out1], -1*4(%[ptr])                                  \t\n"
        "swc1    %[out2], 0(%[ptr])                                     \t\n"
        "nmsub.s %[out3], %[out3], %[in7], %[in8]                       \t\n"
        "madd.s  %[out4], %[out4], %[in6], %[in8]                       \t\n"
        "lwc1    %[in2],  8*4(%[csa])                                   \t\n"
        "swc1    %[out3], -2*4(%[ptr])                                  \t\n"
        "swc1    %[out4], 1*4(%[ptr])                                   \t\n"
        "lwc1    %[in3],  9*4(%[csa])                                   \t\n"
        "lwc1    %[in4],  2*4(%[ptr])                                   \t\n"
        "mul.s   %[out1], %[in1],  %[in2]                               \t\n"
        "lwc1    %[in5],  -4*4(%[ptr])                                  \t\n"
        "lwc1    %[in6],  12*4(%[csa])                                  \t\n"
        "mul.s   %[out2], %[in1],  %[in3]                               \t\n"
        "lwc1    %[in7],  13*4(%[csa])                                  \t\n"
        "nmsub.s %[out1], %[out1], %[in3], %[in4]                       \t\n"
        "lwc1    %[in8],  3*4(%[ptr])                                   \t\n"
        "mul.s   %[out3], %[in5],  %[in6]                               \t\n"
        "madd.s  %[out2], %[out2], %[in2], %[in4]                       \t\n"
        "mul.s   %[out4], %[in5],  %[in7]                               \t\n"
        "swc1    %[out1], -3*4(%[ptr])                                  \t\n"
        "lwc1    %[in1],  -5*4(%[ptr])                                  \t\n"
        "nmsub.s %[out3], %[out3], %[in7], %[in8]                       \t\n"
        "swc1    %[out2], 2*4(%[ptr])                                   \t\n"
        "madd.s  %[out4], %[out4], %[in6], %[in8]                       \t\n"
        "lwc1    %[in2],  16*4(%[csa])                                  \t\n"
        "lwc1    %[in3],  17*4(%[csa])                                  \t\n"
        "swc1    %[out3], -4*4(%[ptr])                                  \t\n"
        "lwc1    %[in4],  4*4(%[ptr])                                   \t\n"
        "swc1    %[out4], 3*4(%[ptr])                                   \t\n"
        "mul.s   %[out1], %[in1],  %[in2]                               \t\n"
        "mul.s   %[out2], %[in1],  %[in3]                               \t\n"
        "lwc1    %[in5],  -6*4(%[ptr])                                  \t\n"
        "lwc1    %[in6],  20*4(%[csa])                                  \t\n"
        "lwc1    %[in7],  21*4(%[csa])                                  \t\n"
        "nmsub.s %[out1], %[out1], %[in3], %[in4]                       \t\n"
        "madd.s  %[out2], %[out2], %[in2], %[in4]                       \t\n"
        "lwc1    %[in8],  5*4(%[ptr])                                   \t\n"
        "mul.s   %[out3], %[in5],  %[in6]                               \t\n"
        "mul.s   %[out4], %[in5],  %[in7]                               \t\n"
        "swc1    %[out1], -5*4(%[ptr])                                  \t\n"
        "swc1    %[out2], 4*4(%[ptr])                                   \t\n"
        "lwc1    %[in1],  -7*4(%[ptr])                                  \t\n"
        "nmsub.s %[out3], %[out3], %[in7], %[in8]                       \t\n"
        "madd.s  %[out4], %[out4], %[in6], %[in8]                       \t\n"
        "lwc1    %[in2],  24*4(%[csa])                                  \t\n"
        "lwc1    %[in3],  25*4(%[csa])                                  \t\n"
        "lwc1    %[in4],  6*4(%[ptr])                                   \t\n"
        "swc1    %[out3], -6*4(%[ptr])                                  \t\n"
        "swc1    %[out4], 5*4(%[ptr])                                   \t\n"
        "mul.s   %[out1], %[in1],  %[in2]                               \t\n"
        "lwc1    %[in5],  -8*4(%[ptr])                                  \t\n"
        "mul.s   %[out2], %[in1],  %[in3]                               \t\n"
        "lwc1    %[in6],  28*4(%[csa])                                  \t\n"
        "lwc1    %[in7],  29*4(%[csa])                                  \t\n"
        "nmsub.s %[out1], %[out1], %[in3], %[in4]                       \t\n"
        "lwc1    %[in8],  7*4(%[ptr])                                   \t\n"
        "madd.s  %[out2], %[out2], %[in2], %[in4]                       \t\n"
        "mul.s   %[out3], %[in5],  %[in6]                               \t\n"
        "mul.s   %[out4], %[in5],  %[in7]                               \t\n"
        "swc1    %[out1], -7*4(%[ptr])                                  \t\n"
        "swc1    %[out2], 6*4(%[ptr])                                   \t\n"
        "addiu   %[ptr],  %[ptr],  72                                   \t\n"
        "nmsub.s %[out3], %[out3], %[in7], %[in8]                       \t\n"
        "madd.s  %[out4], %[out4], %[in6], %[in8]                       \t\n"
        "swc1    %[out3], -26*4(%[ptr])                                 \t\n"
        "swc1    %[out4], -11*4(%[ptr])                                 \t\n"
        "bne     %[ptr],  %[ptr_end],  compute_antialias_float_loop%=   \t\n"

        : [ptr] "+r" (ptr),
          [in1] "=&f" (in1), [in2] "=&f" (in2),
          [in3] "=&f" (in3), [in4] "=&f" (in4),
          [in5] "=&f" (in5), [in6] "=&f" (in6),
          [in7] "=&f" (in7), [in8] "=&f" (in8),
          [out1] "=&f" (out1), [out2] "=&f" (out2),
          [out3] "=&f" (out3), [out4] "=&f" (out4)
        : [csa] "r" (csa), [ptr_end] "r" (ptr_end)
        : "memory"
    );
}
#define compute_antialias compute_antialias_mips_float
#endif /* HAVE_INLINE_ASM */

#endif /* AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H */