211 lines
4.5 KiB
C
211 lines
4.5 KiB
C
/* uint64_t-like operations that work even on hosts lacking uint64_t
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Copyright (C) 2006, 2009-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE. */
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#if !_GL_CONFIG_H_INCLUDED
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#error "Please include config.h first."
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#include <byteswap.h>
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_GL_INLINE_HEADER_BEGIN
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#ifndef _GL_U64_INLINE
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# define _GL_U64_INLINE _GL_INLINE
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef UINT64_MAX
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/* Native implementations are trivial. See below for comments on what
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these operations do. */
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typedef uint64_t u64;
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# define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo)))
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# define u64init(hi, lo) u64hilo (hi, lo)
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# define u64lo(x) ((u64) (x))
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# define u64size(x) u64lo (x)
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# define u64lt(x, y) ((x) < (y))
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# define u64and(x, y) ((x) & (y))
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# define u64or(x, y) ((x) | (y))
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# define u64xor(x, y) ((x) ^ (y))
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# define u64plus(x, y) ((x) + (y))
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# define u64shl(x, n) ((x) << (n))
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# define u64shr(x, n) ((x) >> (n))
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# define u64bswap(x) bswap_64 (x)
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#else
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# define _GL_U64_MASK32 0xfffffffful /* 2**32 - 1. */
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/* u64 represents a 64-bit unsigned integer value equal to (HI << 32) + LO.
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Implement it with unsigned int, which the GNU coding standards say
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is wide enough to hold 32 bits, and which does not signal an error
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when adding (theoretically possible with types like uint_fast32_t).
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u64init (HI, LO), is like u64hilo (HI, LO), but for use in
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initializer contexts. */
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# ifdef WORDS_BIGENDIAN
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typedef struct { unsigned int hi, lo; } u64;
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# define u64init(hi, lo) { hi, lo }
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# else
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typedef struct { unsigned int lo, hi; } u64;
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# define u64init(hi, lo) { lo, hi }
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# endif
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/* Given the high and low-order 32-bit quantities HI and LO, return a u64
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value representing (HI << 32) + LO. */
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_GL_U64_INLINE u64
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u64hilo (unsigned int hi, unsigned int lo)
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{
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u64 r;
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r.hi = hi;
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r.lo = lo;
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return r;
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}
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/* Return a u64 value representing the 32-bit quantity LO. */
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_GL_U64_INLINE u64
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u64lo (unsigned int lo)
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{
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u64 r;
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r.hi = 0;
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r.lo = lo;
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return r;
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}
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/* Return a u64 value representing SIZE, where 0 <= SIZE < 2**64. */
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_GL_U64_INLINE u64
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u64size (size_t size)
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{
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u64 r;
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r.hi = size >> 31 >> 1;
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r.lo = size & _GL_U64_MASK32;
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return r;
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}
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/* Return X < Y. */
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_GL_U64_INLINE bool
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u64lt (u64 x, u64 y)
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{
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return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo);
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}
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/* Return X & Y. */
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_GL_U64_INLINE u64
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u64and (u64 x, u64 y)
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{
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u64 r;
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r.hi = x.hi & y.hi;
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r.lo = x.lo & y.lo;
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return r;
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}
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/* Return X | Y. */
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_GL_U64_INLINE u64
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u64or (u64 x, u64 y)
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{
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u64 r;
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r.hi = x.hi | y.hi;
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r.lo = x.lo | y.lo;
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return r;
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}
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/* Return X ^ Y. */
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_GL_U64_INLINE u64
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u64xor (u64 x, u64 y)
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{
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u64 r;
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r.hi = x.hi ^ y.hi;
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r.lo = x.lo ^ y.lo;
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return r;
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}
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/* Return X + Y, wrapping around on overflow. */
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_GL_U64_INLINE u64
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u64plus (u64 x, u64 y)
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{
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u64 r;
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r.lo = (x.lo + y.lo) & _GL_U64_MASK32;
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r.hi = (x.hi + y.hi + (r.lo < x.lo)) & _GL_U64_MASK32;
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return r;
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}
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/* Return X << N, where 0 <= N < 64. */
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_GL_U64_INLINE u64
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u64shl (u64 x, int n)
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{
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u64 r;
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if (n < 32)
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{
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r.hi = (x.hi << n & _GL_U64_MASK32) | x.lo >> (32 - n);
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r.lo = x.lo << n & _GL_U64_MASK32;
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}
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else
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{
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r.hi = x.lo << (n - 32) & _GL_U64_MASK32;
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r.lo = 0;
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}
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return r;
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}
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/* Return X >> N. */
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_GL_U64_INLINE u64
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u64shr (u64 x, int n)
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{
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u64 r;
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if (n < 32)
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{
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r.hi = x.hi >> n;
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r.lo = (x.hi << (32 - n) & _GL_U64_MASK32) | x.lo >> n;
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}
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else
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{
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r.hi = 0;
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r.lo = x.hi >> (n - 32);
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}
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return r;
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}
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/* Return X with bytes in reverse order. */
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_GL_U64_INLINE u64
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u64bswap (u64 x)
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{
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return u64hilo (bswap_32 (x.lo), bswap_32 (x.hi));
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}
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#endif
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/* Return X rotated left by N bits, where 0 < N < 64. */
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_GL_U64_INLINE u64
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u64rol (u64 x, int n)
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{
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return u64or (u64shl (x, n), u64shr (x, 64 - n));
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}
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#ifdef __cplusplus
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}
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#endif
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_GL_INLINE_HEADER_END
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