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- /*
- * 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, statep, low, 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"\
- "xor %%ecx , "ret" \n\t"\
- "sub "tmp" , "low" \n\t"
- #else /* HAVE_FAST_CMOV */
- #define BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, 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, statep, low, lowword, range, tmp, tmpbyte, byte, end) \
- "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, statep, low, 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"\
- "shl %%cl , "low" \n\t"\
- "mov "tmpbyte" , "statep" \n\t"\
- "test "lowword" , "lowword" \n\t"\
- " jnz 2f \n\t"\
- "mov "byte" , %%"REG_c" \n\t"\
- "add"OPSIZE" $2 , "byte" \n\t"\
- "movzwl (%%"REG_c") , "tmp" \n\t"\
- "lea -1("low") , %%ecx \n\t"\
- "xor "low" , %%ecx \n\t"\
- "shr $15 , %%ecx \n\t"\
- "bswap "tmp" \n\t"\
- "shr $15 , "tmp" \n\t"\
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\
- "sub $0xFFFF , "tmp" \n\t"\
- "neg %%ecx \n\t"\
- "add $7 , %%ecx \n\t"\
- "shl %%cl , "tmp" \n\t"\
- "add "tmp" , "low" \n\t"\
- "2: \n\t"
-
-
- #if HAVE_7REGS && !defined(BROKEN_RELOCATIONS) && !(defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\
- && !(defined(__i386) && !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1)
- #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, tmp;
-
- __asm__ volatile(
- BRANCHLESS_GET_CABAC("%0", "(%4)", "%1", "%w1",
- "%2", "%3", "%b3",
- "%a6(%5)", "%a7(%5)")
- : "=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp)
- : "r"(state), "r"(c),
- "i"(offsetof(CABACContext, bytestream)),
- "i"(offsetof(CABACContext, bytestream_end))
- : "%"REG_c, "memory"
- );
- return bit & 1;
- }
- #endif /* 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 %a6(%2), %k1 \n\t"
- "movl %a3(%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 %a4(%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, %a4(%2) \n\t"
- "1: \n\t"
- "movl %%eax, %a3(%2) \n\t"
-
- : "+c"(val), "=&r"(tmp)
- : "r"(c),
- "i"(offsetof(CABACContext, low)),
- "i"(offsetof(CABACContext, bytestream)),
- "i"(offsetof(CABACContext, bytestream_end)),
- "i"(offsetof(CABACContext, range))
- : "%eax", "%edx", "memory"
- );
- return val;
- }
-
- #endif /* AVCODEC_X86_CABAC_H */
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