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https://github.com/FFmpeg/FFmpeg.git
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f0b7882ceb
The .text section is already 16-byte aligned by default on all supported platforms so `SECTION_TEXT` isn't any different from `SECTION .text`.
140 lines
3.2 KiB
NASM
140 lines
3.2 KiB
NASM
;******************************************************************************
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;* optimized bswap buffer functions
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;* Copyright (c) 2008 Loren Merritt
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;* Copyright (c) 2003-2013 Michael Niedermayer
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;* Copyright (c) 2013 Daniel Kang
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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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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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SECTION_RODATA
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pb_bswap32: db 3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
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cextern pb_80
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SECTION .text
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; %1 = aligned/unaligned
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%macro BSWAP_LOOPS 1
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mov r3d, r2d
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sar r2d, 3
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jz .left4_%1
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.loop8_%1:
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mov%1 m0, [r1 + 0]
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mov%1 m1, [r1 + 16]
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%if cpuflag(ssse3)
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pshufb m0, m2
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pshufb m1, m2
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mov%1 [r0 + 0], m0
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mov%1 [r0 + 16], m1
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%else
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pshuflw m0, m0, 10110001b
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pshuflw m1, m1, 10110001b
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pshufhw m0, m0, 10110001b
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pshufhw m1, m1, 10110001b
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mova m2, m0
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mova m3, m1
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psllw m0, 8
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psllw m1, 8
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psrlw m2, 8
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psrlw m3, 8
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por m2, m0
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por m3, m1
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mov%1 [r0 + 0], m2
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mov%1 [r0 + 16], m3
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%endif
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add r0, 32
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add r1, 32
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dec r2d
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jnz .loop8_%1
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.left4_%1:
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mov r2d, r3d
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test r3d, 4
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jz .left
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mov%1 m0, [r1]
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%if cpuflag(ssse3)
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pshufb m0, m2
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mov%1 [r0], m0
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%else
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pshuflw m0, m0, 10110001b
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pshufhw m0, m0, 10110001b
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mova m2, m0
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psllw m0, 8
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psrlw m2, 8
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por m2, m0
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mov%1 [r0], m2
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%endif
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add r1, 16
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add r0, 16
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%endmacro
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; void ff_bswap_buf(uint32_t *dst, const uint32_t *src, int w);
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%macro BSWAP32_BUF 0
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%if cpuflag(ssse3)
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cglobal bswap32_buf, 3,4,3
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mov r3, r1
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mova m2, [pb_bswap32]
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%else
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cglobal bswap32_buf, 3,4,5
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mov r3, r1
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%endif
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or r3, r0
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test r3, 15
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jz .start_align
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BSWAP_LOOPS u
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jmp .left
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.start_align:
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BSWAP_LOOPS a
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.left:
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%if cpuflag(ssse3)
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test r2d, 2
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jz .left1
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movq m0, [r1]
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pshufb m0, m2
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movq [r0], m0
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add r1, 8
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add r0, 8
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.left1:
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test r2d, 1
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jz .end
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mov r2d, [r1]
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bswap r2d
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mov [r0], r2d
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%else
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and r2d, 3
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jz .end
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.loop2:
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mov r3d, [r1]
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bswap r3d
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mov [r0], r3d
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add r1, 4
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add r0, 4
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dec r2d
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jnz .loop2
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%endif
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.end:
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RET
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%endmacro
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INIT_XMM sse2
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BSWAP32_BUF
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INIT_XMM ssse3
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BSWAP32_BUF
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