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ffmpeg / libavcodec / x86 / ac3dsp.asm @ dda3f0ef

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;*****************************************************************************
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;* x86-optimized AC-3 DSP utils
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;* Copyright (c) 2011 Justin Ruggles
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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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;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "x86inc.asm"
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%include "x86util.asm"
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SECTION .text
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;-----------------------------------------------------------------------------
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; void ff_ac3_exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
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;-----------------------------------------------------------------------------
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%macro AC3_EXPONENT_MIN 1
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cglobal ac3_exponent_min_%1, 3,4,2, exp, reuse_blks, expn, offset
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    shl  reuse_blksq, 8
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    jz .end
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    LOOP_ALIGN
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.nextexp:
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    mov      offsetq, reuse_blksq
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    mova          m0, [expq+offsetq]
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    sub      offsetq, 256
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    LOOP_ALIGN
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.nextblk:
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    PMINUB        m0, [expq+offsetq], m1
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    sub      offsetq, 256
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    jae .nextblk
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    mova      [expq], m0
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    add         expq, mmsize
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    sub        expnq, mmsize
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    jg .nextexp
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.end:
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    REP_RET
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%endmacro
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%define PMINUB PMINUB_MMX
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%define LOOP_ALIGN
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INIT_MMX
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AC3_EXPONENT_MIN mmx
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%ifdef HAVE_MMX2
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%define PMINUB PMINUB_MMXEXT
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%define LOOP_ALIGN ALIGN 16
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AC3_EXPONENT_MIN mmxext
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%endif
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%ifdef HAVE_SSE
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INIT_XMM
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AC3_EXPONENT_MIN sse2
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%endif
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%undef PMINUB
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%undef LOOP_ALIGN