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https://github.com/php/php-src.git
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25579a8616
Made the macro BC_UINT_T a typedef and renamed it BC_VECTOR. Additionally, several macros have been renamed to be consistent with BC_VECTOR.
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/* private.h: bcmath library header. */
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/*
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Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
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Copyright (C) 2000 Philip A. Nelson
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This library 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 of the License, or (at your option) any later version.
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This library 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. (LICENSE)
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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Boston, MA 02111-1307 USA.
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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/* "Private" routines to bcmath. */
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#include <stdbool.h>
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#include <stddef.h>
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/* This will be 0x01010101 for 32-bit and 0x0101010101010101 for 64-bit */
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#define SWAR_ONES (~((size_t) 0) / 0xFF)
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/* This repeats a byte `x` into an entire 32/64-bit word.
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* Example: SWAR_REPEAT(0xAB) will be 0xABABABAB for 32-bit and 0xABABABABABABABAB for 64-bit. */
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#define SWAR_REPEAT(x) (SWAR_ONES * (x))
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/* Bytes swap */
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#ifdef _MSC_VER
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# include <stdlib.h>
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# define BC_BSWAP32(u) _byteswap_ulong(u)
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# define BC_BSWAP64(u) _byteswap_uint64(u)
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#else
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# ifdef __GNUC__
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# define BC_BSWAP32(u) __builtin_bswap32(u)
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# define BC_BSWAP64(u) __builtin_bswap64(u)
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# elif defined(__has_builtin)
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# if __has_builtin(__builtin_bswap32)
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# define BC_BSWAP32(u) __builtin_bswap32(u)
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# endif // __has_builtin(__builtin_bswap32)
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# if __has_builtin(__builtin_bswap64)
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# define BC_BSWAP64(u) __builtin_bswap64(u)
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# endif // __has_builtin(__builtin_bswap64)
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# endif // __GNUC__
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#endif // _MSC_VER
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#ifndef BC_BSWAP32
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static inline uint32_t BC_BSWAP32(uint32_t u)
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{
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return (((u & 0xff000000) >> 24)
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| ((u & 0x00ff0000) >> 8)
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| ((u & 0x0000ff00) << 8)
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| ((u & 0x000000ff) << 24));
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}
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#endif
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#ifndef BC_BSWAP64
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static inline uint64_t BC_BSWAP64(uint64_t u)
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{
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return (((u & 0xff00000000000000ULL) >> 56)
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| ((u & 0x00ff000000000000ULL) >> 40)
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| ((u & 0x0000ff0000000000ULL) >> 24)
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| ((u & 0x000000ff00000000ULL) >> 8)
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| ((u & 0x00000000ff000000ULL) << 8)
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| ((u & 0x0000000000ff0000ULL) << 24)
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| ((u & 0x000000000000ff00ULL) << 40)
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| ((u & 0x00000000000000ffULL) << 56));
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}
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#endif
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#if SIZEOF_SIZE_T >= 8
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# define BC_BSWAP(u) BC_BSWAP64(u)
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typedef uint64_t BC_VECTOR;
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#else
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# define BC_BSWAP(u) BC_BSWAP32(u)
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typedef uint32_t BC_VECTOR;
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#endif
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#ifdef WORDS_BIGENDIAN
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# define BC_LITTLE_ENDIAN 0
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#else
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# define BC_LITTLE_ENDIAN 1
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#endif
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/* routines */
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bcmath_compare_result _bc_do_compare (bc_num n1, bc_num n2, bool use_sign);
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bc_num _bc_do_add (bc_num n1, bc_num n2);
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bc_num _bc_do_sub (bc_num n1, bc_num n2);
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void _bc_rm_leading_zeros (bc_num num);
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