FFmpeg/libavcodec/arm/ac3dsp_neon.S

/*
 * Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "asm.S"

function ff_ac3_max_msb_abs_int16_neon, export=1
        vmov.i16        q0,  #0
        vmov.i16        q2,  #0
1:      vld1.16         {q1},     [r0,:128]!
        vabs.s16        q1,  q1
        vld1.16         {q3},     [r0,:128]!
        vabs.s16        q3,  q3
        vorr            q0,  q0,  q1
        vorr            q2,  q2,  q3
        subs            r1,  r1,  #16
        bgt             1b
        vorr            q0,  q0,  q2
        vorr            d0,  d0,  d1
        vpmax.u16       d0,  d0,  d0
        vpmax.u16       d0,  d0,  d0
        vmov.u16        r0,  d0[0]
        bx              lr
endfunc

function ff_ac3_exponent_min_neon, export=1
        cmp             r1,  #0
        bxeq            lr
        push            {lr}
        mov             r12, #256
1:
        vld1.8          {q0},     [r0,:128]
        mov             lr,  r1
        add             r3,  r0,  #256
2:      vld1.8          {q1},     [r3,:128], r12
        subs            lr,  lr,  #1
        vmin.u8         q0,  q0,  q1
        bgt             2b
        subs            r2,  r2,  #16
        vst1.8          {q0},     [r0,:128]!
        bgt             1b
        pop             {pc}
endfunc

function ff_ac3_lshift_int16_neon, export=1
        vdup.16         q0,  r2
1:      vld1.16         {q1},     [r0,:128]
        vshl.s16        q1,  q1,  q0
        vst1.16         {q1},     [r0,:128]!
        subs            r1,  r1,  #8
        bgt             1b
        bx              lr
endfunc

function ff_ac3_rshift_int32_neon, export=1
        rsb             r2,  r2,  #0
        vdup.32         q0,  r2
1:      vld1.32         {q1},     [r0,:128]
        vshl.s32        q1,  q1,  q0
        vst1.32         {q1},     [r0,:128]!
        subs            r1,  r1,  #4
        bgt             1b
        bx              lr
endfunc

function ff_float_to_fixed24_neon, export=1
1:      vld1.32         {q0-q1},  [r1,:128]!
        vcvt.s32.f32    q0,  q0,  #24
        vld1.32         {q2-q3},  [r1,:128]!
        vcvt.s32.f32    q1,  q1,  #24
        vcvt.s32.f32    q2,  q2,  #24
        vst1.32         {q0-q1},  [r0,:128]!
        vcvt.s32.f32    q3,  q3,  #24
        vst1.32         {q2-q3},  [r0,:128]!
        subs            r2,  r2,  #16
        bgt             1b
        bx              lr
endfunc