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7f668cd2b5
The reason is this is easier for PIC code (in particular on darwin...). Keep the old names as pointers (static in cabac_functions.h so gcc knows these are just immediate offsets) so the c code can nicely stay the same (alternatively could use offsets directly in the functions needing the tables). This should produce the same code as before with non-pic and better code (confirmed) with pic. The assembly uses the new table but still won't work for PIC case. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
168 lines
6.5 KiB
C
168 lines
6.5 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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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 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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/**
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* @file
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* H.264 / AVC / MPEG4 part10 codec.
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* non-MMX i386-specific optimizations for H.264
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef AVCODEC_X86_H264_I386_H
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#define AVCODEC_X86_H264_I386_H
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#include <stddef.h>
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#include "libavcodec/cabac.h"
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#include "cabac.h"
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//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
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//as that would make optimization work hard)
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#if HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
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static int decode_significance_x86(CABACContext *c, int max_coeff,
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uint8_t *significant_coeff_ctx_base,
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int *index, x86_reg last_off){
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void *end= significant_coeff_ctx_base + max_coeff - 1;
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int minusstart= -(intptr_t)significant_coeff_ctx_base;
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int minusindex= 4-(intptr_t)index;
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int bit;
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x86_reg coeff_count;
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__asm__ volatile(
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"3: \n\t"
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BRANCHLESS_GET_CABAC("%4", "(%1)", "%3", "%w3",
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"%5", "%k0", "%b0",
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"%a11(%6)", "%a12(%6)", "%a13", "%a14", "%a15")
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"test $1, %4 \n\t"
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" jz 4f \n\t"
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"add %10, %1 \n\t"
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BRANCHLESS_GET_CABAC("%4", "(%1)", "%3", "%w3",
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"%5", "%k0", "%b0",
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"%a11(%6)", "%a12(%6)", "%a13", "%a14", "%a15")
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"sub %10, %1 \n\t"
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"mov %2, %0 \n\t"
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"movl %7, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%0) \n\t"
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"test $1, %4 \n\t"
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" jnz 5f \n\t"
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"add"OPSIZE" $4, %2 \n\t"
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"4: \n\t"
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"add $1, %1 \n\t"
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"cmp %8, %1 \n\t"
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" jb 3b \n\t"
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"mov %2, %0 \n\t"
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"movl %7, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%0) \n\t"
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"5: \n\t"
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"add %9, %k0 \n\t"
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"shr $2, %k0 \n\t"
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: "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
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"+&r"(c->low), "=&r"(bit), "+&r"(c->range)
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: "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
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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)
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: "%"REG_c, "memory"
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);
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return coeff_count;
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}
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static int decode_significance_8x8_x86(CABACContext *c,
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uint8_t *significant_coeff_ctx_base,
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int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
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int minusindex= 4-(intptr_t)index;
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int bit;
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x86_reg coeff_count;
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x86_reg last=0;
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x86_reg state;
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__asm__ volatile(
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"mov %1, %6 \n\t"
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"3: \n\t"
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"mov %10, %0 \n\t"
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"movzbl (%0, %6), %k6 \n\t"
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"add %9, %6 \n\t"
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BRANCHLESS_GET_CABAC("%4", "(%6)", "%3", "%w3",
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"%5", "%k0", "%b0",
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"%a12(%7)", "%a13(%7)", "%a14", "%a15", "%a16")
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"mov %1, %k6 \n\t"
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"test $1, %4 \n\t"
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" jz 4f \n\t"
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"movzbl "MANGLE(ff_h264_cabac_tables)"+%a17(%k6), %k6\n\t"
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"add %11, %6 \n\t"
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BRANCHLESS_GET_CABAC("%4", "(%6)", "%3", "%w3",
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"%5", "%k0", "%b0",
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"%a12(%7)", "%a13(%7)", "%a14", "%a15", "%a16")
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"mov %2, %0 \n\t"
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"mov %1, %k6 \n\t"
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"movl %k6, (%0) \n\t"
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"test $1, %4 \n\t"
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" jnz 5f \n\t"
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"add"OPSIZE" $4, %2 \n\t"
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"4: \n\t"
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"addl $1, %k6 \n\t"
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"mov %k6, %1 \n\t"
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"cmpl $63, %k6 \n\t"
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" jb 3b \n\t"
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"mov %2, %0 \n\t"
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"movl %k6, (%0) \n\t"
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"5: \n\t"
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"addl %8, %k0 \n\t"
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"shr $2, %k0 \n\t"
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: "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
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"=&r"(bit), "+&r"(c->range), "=&r"(state)
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: "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
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"m"(sig_off), "m"(last_coeff_ctx_base),
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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),
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"i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET)
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: "%"REG_c, "memory"
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);
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return coeff_count;
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}
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#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
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#endif /* AVCODEC_X86_H264_I386_H */
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