| /* uint64_t-like operations that work even on hosts lacking uint64_t |
| |
| Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| /* Written by Paul Eggert. */ |
| |
| #include <stdint.h> |
| |
| #ifndef _GL_INLINE_HEADER_BEGIN |
| #error "Please include config.h first." |
| #endif |
| _GL_INLINE_HEADER_BEGIN |
| #ifndef _GL_U64_INLINE |
| # define _GL_U64_INLINE _GL_INLINE |
| #endif |
| |
| /* Return X rotated left by N bits, where 0 < N < 64. */ |
| #define u64rol(x, n) u64or (u64shl (x, n), u64shr (x, 64 - n)) |
| |
| #ifdef UINT64_MAX |
| |
| /* Native implementations are trivial. See below for comments on what |
| these operations do. */ |
| typedef uint64_t u64; |
| # define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo))) |
| # define u64init(hi, lo) u64hilo (hi, lo) |
| # define u64lo(x) ((u64) (x)) |
| # define u64size(x) u64lo (x) |
| # define u64lt(x, y) ((x) < (y)) |
| # define u64and(x, y) ((x) & (y)) |
| # define u64or(x, y) ((x) | (y)) |
| # define u64xor(x, y) ((x) ^ (y)) |
| # define u64plus(x, y) ((x) + (y)) |
| # define u64shl(x, n) ((x) << (n)) |
| # define u64shr(x, n) ((x) >> (n)) |
| |
| #else |
| |
| /* u64 is a 64-bit unsigned integer value. |
| u64init (HI, LO), is like u64hilo (HI, LO), but for use in |
| initializer contexts. */ |
| # ifdef WORDS_BIGENDIAN |
| typedef struct { uint32_t hi, lo; } u64; |
| # define u64init(hi, lo) { hi, lo } |
| # else |
| typedef struct { uint32_t lo, hi; } u64; |
| # define u64init(hi, lo) { lo, hi } |
| # endif |
| |
| /* Given the high and low-order 32-bit quantities HI and LO, return a u64 |
| value representing (HI << 32) + LO. */ |
| _GL_U64_INLINE u64 |
| u64hilo (uint32_t hi, uint32_t lo) |
| { |
| u64 r; |
| r.hi = hi; |
| r.lo = lo; |
| return r; |
| } |
| |
| /* Return a u64 value representing LO. */ |
| _GL_U64_INLINE u64 |
| u64lo (uint32_t lo) |
| { |
| u64 r; |
| r.hi = 0; |
| r.lo = lo; |
| return r; |
| } |
| |
| /* Return a u64 value representing SIZE. */ |
| _GL_U64_INLINE u64 |
| u64size (size_t size) |
| { |
| u64 r; |
| r.hi = size >> 31 >> 1; |
| r.lo = size; |
| return r; |
| } |
| |
| /* Return X < Y. */ |
| _GL_U64_INLINE int |
| u64lt (u64 x, u64 y) |
| { |
| return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo); |
| } |
| |
| /* Return X & Y. */ |
| _GL_U64_INLINE u64 |
| u64and (u64 x, u64 y) |
| { |
| u64 r; |
| r.hi = x.hi & y.hi; |
| r.lo = x.lo & y.lo; |
| return r; |
| } |
| |
| /* Return X | Y. */ |
| _GL_U64_INLINE u64 |
| u64or (u64 x, u64 y) |
| { |
| u64 r; |
| r.hi = x.hi | y.hi; |
| r.lo = x.lo | y.lo; |
| return r; |
| } |
| |
| /* Return X ^ Y. */ |
| _GL_U64_INLINE u64 |
| u64xor (u64 x, u64 y) |
| { |
| u64 r; |
| r.hi = x.hi ^ y.hi; |
| r.lo = x.lo ^ y.lo; |
| return r; |
| } |
| |
| /* Return X + Y. */ |
| _GL_U64_INLINE u64 |
| u64plus (u64 x, u64 y) |
| { |
| u64 r; |
| r.lo = x.lo + y.lo; |
| r.hi = x.hi + y.hi + (r.lo < x.lo); |
| return r; |
| } |
| |
| /* Return X << N. */ |
| _GL_U64_INLINE u64 |
| u64shl (u64 x, int n) |
| { |
| u64 r; |
| if (n < 32) |
| { |
| r.hi = (x.hi << n) | (x.lo >> (32 - n)); |
| r.lo = x.lo << n; |
| } |
| else |
| { |
| r.hi = x.lo << (n - 32); |
| r.lo = 0; |
| } |
| return r; |
| } |
| |
| /* Return X >> N. */ |
| _GL_U64_INLINE u64 |
| u64shr (u64 x, int n) |
| { |
| u64 r; |
| if (n < 32) |
| { |
| r.hi = x.hi >> n; |
| r.lo = (x.hi << (32 - n)) | (x.lo >> n); |
| } |
| else |
| { |
| r.hi = 0; |
| r.lo = x.hi >> (n - 32); |
| } |
| return r; |
| } |
| |
| #endif |
| |
| _GL_INLINE_HEADER_END |