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Diffstat (limited to 'libavcodec/x86/cabac.h')
| -rw-r--r-- | libavcodec/x86/cabac.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/libavcodec/x86/cabac.h b/libavcodec/x86/cabac.h new file mode 100644 index 0000000000..3e5a2217ae --- /dev/null +++ b/libavcodec/x86/cabac.h @@ -0,0 +1,148 @@ +/* + * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> + * + * 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 + */ + +#ifndef AVCODEC_X86_CABAC_H +#define AVCODEC_X86_CABAC_H + +#include "libavcodec/cabac.h" +#include "libavutil/attributes.h" +#include "libavutil/x86_cpu.h" +#include "config.h" + +#if HAVE_FAST_CMOV +#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\ + "mov "tmp" , %%ecx \n\t"\ + "shl $17 , "tmp" \n\t"\ + "cmp "low" , "tmp" \n\t"\ + "cmova %%ecx , "range" \n\t"\ + "sbb %%ecx , %%ecx \n\t"\ + "and %%ecx , "tmp" \n\t"\ + "sub "tmp" , "low" \n\t"\ + "xor %%ecx , "ret" \n\t" +#else /* HAVE_FAST_CMOV */ +#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\ + "mov "tmp" , %%ecx \n\t"\ + "shl $17 , "tmp" \n\t"\ + "sub "low" , "tmp" \n\t"\ + "sar $31 , "tmp" \n\t" /*lps_mask*/\ + "sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ + "and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ + "add %%ecx , "range" \n\t" /*new range*/\ + "shl $17 , %%ecx \n\t"\ + "and "tmp" , %%ecx \n\t"\ + "sub %%ecx , "low" \n\t"\ + "xor "tmp" , "ret" \n\t" +#endif /* HAVE_FAST_CMOV */ + +#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \ + "movzbl "statep" , "ret" \n\t"\ + "mov "range" , "tmp" \n\t"\ + "and $0xC0 , "range" \n\t"\ + "movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\ + "sub "range" , "tmp" \n\t"\ + BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, \ + range, tmp) \ + "movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ + "shl %%cl , "range" \n\t"\ + "movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ + "mov "tmpbyte" , "statep" \n\t"\ + "shl %%cl , "low" \n\t"\ + "test "lowword" , "lowword" \n\t"\ + " jnz 1f \n\t"\ + "mov "byte"("cabac"), %%"REG_c" \n\t"\ + "movzwl (%%"REG_c") , "tmp" \n\t"\ + "bswap "tmp" \n\t"\ + "shr $15 , "tmp" \n\t"\ + "sub $0xFFFF , "tmp" \n\t"\ + "add $2 , %%"REG_c" \n\t"\ + "mov %%"REG_c" , "byte "("cabac") \n\t"\ + "lea -1("low") , %%ecx \n\t"\ + "xor "low" , %%ecx \n\t"\ + "shr $15 , %%ecx \n\t"\ + "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ + "neg %%ecx \n\t"\ + "add $7 , %%ecx \n\t"\ + "shl %%cl , "tmp" \n\t"\ + "add "tmp" , "low" \n\t"\ + "1: \n\t" + +#if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) +#define get_cabac_inline get_cabac_inline_x86 +static av_always_inline int get_cabac_inline_x86(CABACContext *c, + uint8_t *const state) +{ + int bit, low, range, tmp; + + __asm__ volatile( + "movl %a6(%5), %2 \n\t" + "movl %a7(%5), %1 \n\t" + BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2", + "%3", "%b3", "%a8") + "movl %2, %a6(%5) \n\t" + "movl %1, %a7(%5) \n\t" + + :"=&r"(bit), "=&r"(low), "=&r"(range), "=&r"(tmp) + :"r"(state), "r"(c), + "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), + "i"(offsetof(CABACContext, bytestream)) + : "%"REG_c, "memory" + ); + return bit & 1; +} +#endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */ + +#define get_cabac_bypass_sign get_cabac_bypass_sign_x86 +static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val) +{ + x86_reg tmp; + __asm__ volatile( + "movl %a3(%2), %k1 \n\t" + "movl %a4(%2), %%eax \n\t" + "shl $17, %k1 \n\t" + "add %%eax, %%eax \n\t" + "sub %k1, %%eax \n\t" + "cltd \n\t" + "and %%edx, %k1 \n\t" + "add %k1, %%eax \n\t" + "xor %%edx, %%ecx \n\t" + "sub %%edx, %%ecx \n\t" + "test %%ax, %%ax \n\t" + " jnz 1f \n\t" + "mov %a5(%2), %1 \n\t" + "subl $0xFFFF, %%eax \n\t" + "movzwl (%1), %%edx \n\t" + "bswap %%edx \n\t" + "shrl $15, %%edx \n\t" + "add $2, %1 \n\t" + "addl %%edx, %%eax \n\t" + "mov %1, %a5(%2) \n\t" + "1: \n\t" + "movl %%eax, %a4(%2) \n\t" + + :"+c"(val), "=&r"(tmp) + :"r"(c), + "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), + "i"(offsetof(CABACContext, bytestream)) + : "%eax", "%edx", "memory" + ); + return val; +} + +#endif /* AVCODEC_X86_CABAC_H */ |