136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stddef.h>
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#include <stdint.h>
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/* Return X rotated left by N bits, where 0 < N < 64. */
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#define u64rol(x, n) u64or(u64shl(x, n), u64shr(x, 64 - n))
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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 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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#else
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/* u64 is a 64-bit unsigned integer value.
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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 { uint32_t hi, lo; } u64;
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#define u64init(hi, lo) \
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{ hi, lo }
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#else
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typedef struct { uint32_t lo, hi; } u64;
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#define u64init(hi, lo) \
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{ 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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static inline u64 u64hilo(uint32_t hi, uint32_t lo) {
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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 LO. */
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static inline u64 u64lo(uint32_t lo) {
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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 X < Y. */
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static inline int u64lt(u64 x, u64 y) {
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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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static inline u64 u64and(u64 x, u64 y) {
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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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static inline u64 u64or(u64 x, u64 y) {
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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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static inline u64 u64xor(u64 x, u64 y) {
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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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static inline u64 u64plus(u64 x, u64 y) {
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u64 r;
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r.lo = x.lo + y.lo;
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r.hi = x.hi + y.hi + (r.lo < x.lo);
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return r;
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}
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/* Return X << N. */
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static inline u64 u64shl(u64 x, int n) {
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u64 r;
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if (n < 32) {
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r.hi = (x.hi << n) | (x.lo >> (32 - n));
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r.lo = x.lo << n;
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} else {
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r.hi = x.lo << (n - 32);
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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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static inline u64 u64shr(u64 x, int n) {
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u64 r;
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if (n < 32) {
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r.hi = x.hi >> n;
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r.lo = (x.hi << (32 - n)) | (x.lo >> n);
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} else {
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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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#endif
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