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226 lines
11 KiB
226 lines
11 KiB
/* |
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#ifndef AVCODEC_X86_CABAC_H |
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#define AVCODEC_X86_CABAC_H |
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#include "libavcodec/cabac.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/x86_cpu.h" |
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#include "libavutil/internal.h" |
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#include "config.h" |
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#if HAVE_INLINE_ASM |
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#ifdef BROKEN_RELOCATIONS |
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#define TABLES_ARG , "r"(tables) |
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#if HAVE_FAST_CMOV |
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ |
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"cmp "low" , "tmp" \n\t"\ |
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"cmova %%ecx , "range" \n\t"\ |
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"sbb %%rcx , %%rcx \n\t"\ |
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"and %%ecx , "tmp" \n\t"\ |
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"xor %%rcx , "retq" \n\t"\ |
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"sub "tmp" , "low" \n\t" |
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#else /* HAVE_FAST_CMOV */ |
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ |
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/* P4 Prescott has crappy cmov,sbb,64bit shift so avoid them */ \ |
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"sub "low" , "tmp" \n\t"\ |
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"sar $31 , "tmp" \n\t"\ |
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"sub %%ecx , "range" \n\t"\ |
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"and "tmp" , "range" \n\t"\ |
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"add %%ecx , "range" \n\t"\ |
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"shl $17 , %%ecx \n\t"\ |
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"and "tmp" , %%ecx \n\t"\ |
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"sub %%ecx , "low" \n\t"\ |
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"xor "tmp" , "ret" \n\t"\ |
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"movslq "ret" , "retq" \n\t" |
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#endif /* HAVE_FAST_CMOV */ |
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#define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \ |
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"movzbl "statep" , "ret" \n\t"\ |
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"mov "range" , "tmp" \n\t"\ |
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"and $0xC0 , "range" \n\t"\ |
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"lea ("ret", "range", 2), %%ecx \n\t"\ |
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"movzbl "lps_off"("tables", %%rcx), "range" \n\t"\ |
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"sub "range" , "tmp" \n\t"\ |
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"mov "tmp" , %%ecx \n\t"\ |
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"shl $17 , "tmp" \n\t"\ |
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BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ |
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"movzbl "norm_off"("tables", "rangeq"), %%ecx \n\t"\ |
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"shl %%cl , "range" \n\t"\ |
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"movzbl "mlps_off"+128("tables", "retq"), "tmp" \n\t"\ |
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"shl %%cl , "low" \n\t"\ |
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"mov "tmpbyte" , "statep" \n\t"\ |
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"test "lowword" , "lowword" \n\t"\ |
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"jnz 2f \n\t"\ |
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"mov "byte" , %%"REG_c" \n\t"\ |
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"add"OPSIZE" $2 , "byte" \n\t"\ |
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"movzwl (%%"REG_c") , "tmp" \n\t"\ |
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"lea -1("low") , %%ecx \n\t"\ |
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"xor "low" , %%ecx \n\t"\ |
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"shr $15 , %%ecx \n\t"\ |
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"bswap "tmp" \n\t"\ |
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"shr $15 , "tmp" \n\t"\ |
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"movzbl "norm_off"("tables", %%rcx), %%ecx \n\t"\ |
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"sub $0xFFFF , "tmp" \n\t"\ |
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"neg %%ecx \n\t"\ |
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"add $7 , %%ecx \n\t"\ |
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"shl %%cl , "tmp" \n\t"\ |
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"add "tmp" , "low" \n\t"\ |
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"2: \n\t" |
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#else /* BROKEN_RELOCATIONS */ |
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#define TABLES_ARG |
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#define RIP_ARG |
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#if HAVE_FAST_CMOV |
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\ |
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"mov "tmp" , %%ecx \n\t"\ |
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"shl $17 , "tmp" \n\t"\ |
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"cmp "low" , "tmp" \n\t"\ |
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"cmova %%ecx , "range" \n\t"\ |
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"sbb %%ecx , %%ecx \n\t"\ |
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"and %%ecx , "tmp" \n\t"\ |
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"xor %%ecx , "ret" \n\t"\ |
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"sub "tmp" , "low" \n\t" |
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#else /* HAVE_FAST_CMOV */ |
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\ |
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"mov "tmp" , %%ecx \n\t"\ |
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"shl $17 , "tmp" \n\t"\ |
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"sub "low" , "tmp" \n\t"\ |
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"sar $31 , "tmp" \n\t" /*lps_mask*/\ |
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"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ |
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"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ |
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"add %%ecx , "range" \n\t" /*new range*/\ |
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"shl $17 , %%ecx \n\t"\ |
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"and "tmp" , %%ecx \n\t"\ |
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"sub %%ecx , "low" \n\t"\ |
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"xor "tmp" , "ret" \n\t" |
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#endif /* HAVE_FAST_CMOV */ |
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#define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \ |
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"movzbl "statep" , "ret" \n\t"\ |
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"mov "range" , "tmp" \n\t"\ |
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"and $0xC0 , "range" \n\t"\ |
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"movzbl "MANGLE(ff_h264_cabac_tables)"+"lps_off"("ret", "range", 2), "range" \n\t"\ |
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"sub "range" , "tmp" \n\t"\ |
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BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp) \ |
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"movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"("range"), %%ecx \n\t"\ |
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"shl %%cl , "range" \n\t"\ |
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"movzbl "MANGLE(ff_h264_cabac_tables)"+"mlps_off"+128("ret"), "tmp" \n\t"\ |
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"shl %%cl , "low" \n\t"\ |
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"mov "tmpbyte" , "statep" \n\t"\ |
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"test "lowword" , "lowword" \n\t"\ |
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" jnz 2f \n\t"\ |
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"mov "byte" , %%"REG_c" \n\t"\ |
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"add"OPSIZE" $2 , "byte" \n\t"\ |
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"movzwl (%%"REG_c") , "tmp" \n\t"\ |
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"lea -1("low") , %%ecx \n\t"\ |
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"xor "low" , %%ecx \n\t"\ |
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"shr $15 , %%ecx \n\t"\ |
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"bswap "tmp" \n\t"\ |
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"shr $15 , "tmp" \n\t"\ |
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"movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"(%%ecx), %%ecx \n\t"\ |
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"sub $0xFFFF , "tmp" \n\t"\ |
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"neg %%ecx \n\t"\ |
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"add $7 , %%ecx \n\t"\ |
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"shl %%cl , "tmp" \n\t"\ |
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"add "tmp" , "low" \n\t"\ |
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"2: \n\t" |
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#endif /* BROKEN_RELOCATIONS */ |
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#if HAVE_7REGS && !(defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\ |
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&& !(defined(__i386) && !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1) |
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#define get_cabac_inline get_cabac_inline_x86 |
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static av_always_inline int get_cabac_inline_x86(CABACContext *c, |
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uint8_t *const state) |
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{ |
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int bit, tmp; |
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#ifdef BROKEN_RELOCATIONS |
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void *tables; |
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__asm__ volatile( |
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"lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t" |
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: "=&r"(tables) |
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); |
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#endif |
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__asm__ volatile( |
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BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1", |
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"%2", "%q2", "%3", "%b3", |
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"%a6(%5)", "%a7(%5)", "%a8", "%a9", "%a10", "%11") |
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: "=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp) |
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: "r"(state), "r"(c), |
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"i"(offsetof(CABACContext, bytestream)), |
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"i"(offsetof(CABACContext, bytestream_end)), |
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"i"(H264_NORM_SHIFT_OFFSET), |
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"i"(H264_LPS_RANGE_OFFSET), |
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"i"(H264_MLPS_STATE_OFFSET) TABLES_ARG |
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: "%"REG_c, "memory" |
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); |
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return bit & 1; |
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} |
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#endif /* HAVE_7REGS */ |
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#define get_cabac_bypass_sign get_cabac_bypass_sign_x86 |
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static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val) |
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{ |
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x86_reg tmp; |
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__asm__ volatile( |
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"movl %a6(%2), %k1 \n\t" |
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"movl %a3(%2), %%eax \n\t" |
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"shl $17, %k1 \n\t" |
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"add %%eax, %%eax \n\t" |
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"sub %k1, %%eax \n\t" |
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"cltd \n\t" |
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"and %%edx, %k1 \n\t" |
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"add %k1, %%eax \n\t" |
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"xor %%edx, %%ecx \n\t" |
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"sub %%edx, %%ecx \n\t" |
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"test %%ax, %%ax \n\t" |
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"jnz 1f \n\t" |
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"mov %a4(%2), %1 \n\t" |
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"subl $0xFFFF, %%eax \n\t" |
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"movzwl (%1), %%edx \n\t" |
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"bswap %%edx \n\t" |
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"shrl $15, %%edx \n\t" |
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"add $2, %1 \n\t" |
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"addl %%edx, %%eax \n\t" |
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"mov %1, %a4(%2) \n\t" |
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"1: \n\t" |
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"movl %%eax, %a3(%2) \n\t" |
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: "+c"(val), "=&r"(tmp) |
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: "r"(c), |
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"i"(offsetof(CABACContext, low)), |
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"i"(offsetof(CABACContext, bytestream)), |
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"i"(offsetof(CABACContext, bytestream_end)), |
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"i"(offsetof(CABACContext, range)) |
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: "%eax", "%edx", "memory" |
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); |
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return val; |
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} |
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#endif /* HAVE_INLINE_ASM */ |
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#endif /* AVCODEC_X86_CABAC_H */
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