fmtconvert_altivec.c

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/*
 * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
 *
 * 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
 */

#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/mem.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/ppc/util_altivec.h"
#include "libavcodec/fmtconvert.h"

#if HAVE_ALTIVEC

static void int32_to_float_fmul_scalar_altivec(float *dst, const int32_t *src,
                                               float mul, int len)
{
    union {
        vector float v;
        float s[4];
    } mul_u;
    int i;
    vector float src1, src2, dst1, dst2, mul_v, zero;

    zero = (vector float)vec_splat_u32(0);
    mul_u.s[0] = mul;
    mul_v = vec_splat(mul_u.v, 0);

    for (i = 0; i < len; i += 8) {
        src1 = vec_ctf(vec_ld(0,  src+i), 0);
        src2 = vec_ctf(vec_ld(16, src+i), 0);
        dst1 = vec_madd(src1, mul_v, zero);
        dst2 = vec_madd(src2, mul_v, zero);
        vec_st(dst1,  0, dst+i);
        vec_st(dst2, 16, dst+i);
    }
}

#endif /* HAVE_ALTIVEC */

av_cold void ff_fmt_convert_init_ppc(FmtConvertContext *c,
                                     AVCodecContext *avctx)
{
#if HAVE_ALTIVEC
    if (!PPC_ALTIVEC(av_get_cpu_flags()))
        return;

    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
#endif /* HAVE_ALTIVEC */
}