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These can be implemented efficiently on most modern 64-bit compilers. Fallback is only needed for 32-bit, which we do using the existing generic "integer.h" header (currently also hard-coded as 128 bits). Sponsored-by: Sovereign Tech Fund Signed-off-by: Niklas Haas <git@haasn.dev>
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*
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* 128-bit integers
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* Copyright (c) 2026 Niklas Haas
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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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* 128-bit integers, falling back to integer.h if necessary
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* @author Niklas Haas
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*/
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#ifndef AVUTIL_INT128_H
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#define AVUTIL_INT128_H
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#include <stdint.h>
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#include <stddef.h>
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#include <limits.h>
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#include "config.h"
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#include "integer.h"
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#if HAVE_INT128
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#define AV_INT128_NATIVE 1
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typedef unsigned __int128 av_uint128;
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typedef __int128 av_int128;
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#elif defined(BITINT_MAXWIDTH) && BITINT_MAXWIDTH >= 128
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#define AV_INT128_NATIVE 1
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typedef unsigned _BitInt(128) av_uint128;
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typedef _BitInt(128) av_int128;
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#elif AV_INTEGER_SIZE >= 8
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#define AV_INT128_NATIVE 0
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typedef AVInteger av_uint128;
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typedef AVInteger av_int128;
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#else
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#error "128-bit integer type not available"
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#endif
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#if AV_INT128_NATIVE
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# define av_add128(a, b) ((a) + (b))
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# define av_sub128(a, b) ((a) - (b))
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# define av_mul128(a, b) ((a) * (b))
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# define av_div128(a, b) ((a) / (b))
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# define av_cmp128(a, b) ((a) < (b) ? -1 : (a) > (b) ? 1 : 0)
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# define av_min128(a, b) ((a) > (b) ? (b) : (a))
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# define av_max128(a, b) ((a) > (b) ? (a) : (b))
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# define av_eq128(a, b) ((a) == (b))
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# define av_mod128(a, b) ((a) % (b))
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# define av_shr128(a, b) ((a) >> (b))
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# define av_to128u(a) ((av_uint128) (a))
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# define av_to128i(a) ((av_int128) (a))
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# define av_from128i(a) ((int64_t) (a))
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# define av_from128u(a) ((uint64_t) (a))
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# define av_test128(a) (!!(a))
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#else
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# define av_add128(a, b) av_add_i(a, b)
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# define av_sub128(a, b) av_sub_i(a, b)
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# define av_mul128(a, b) av_mul_i(a, b)
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# define av_div128(a, b) av_div_i(a, b)
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# define av_cmp128(a, b) av_cmp_i(a, b)
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# define av_min128(a, b) (av_cmp_i(a, b) > 0 ? (b) : (a))
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# define av_max128(a, b) (av_cmp_i(a, b) > 0 ? (a) : (b))
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# define av_eq128(a, b) (av_cmp_i(a, b) == 0)
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# define av_mod128(a, b) av_mod_i(NULL, a, b)
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# define av_shr128(a, b) av_shr_i(a, b)
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# define av_to128i(a) av_int2i(a)
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# define av_from128i(a) av_i2int(a)
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# define av_from128u(a) ((uint64_t) av_i2int(a))
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# define av_test128(a) (!av_eq128(a, av_to128u(0)))
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static av_always_inline av_uint128 av_to128u(uint64_t a)
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{
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return (AVInteger) {{ a, a >> 16, a >> 32, a >> 48 }};
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}
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#endif
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#endif /* AVUTIL_INT128_H */
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