source: trunk/lib/byte_compare.hpp @ 3341

Last change on this file since 3341 was 2719, checked in by cameron, 7 years ago

Some copyright and description fixes

File size: 3.1 KB
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[1950]1#ifndef BYTE_COMPARE_HPP
2#define BYTE_COMPARE_HPP
3
4/*=============================================================================
[1816]5    byte_compare - Byte comparison methods.
6
7    Copyright (C) 2011, Robert D. Cameron, Kenneth S. Herdy.
8    Licensed to the public under the Open Software License 3.0.
9    Licensed to International Characters Inc.
[1950]10    under the Academic Free License version 3.0.
[2093]11
12    Created on:
13    Author: Ken Herdy
[1950]14=============================================================================*/
[1829]15
[1950]16///////////////////////////////////////////////////////////////////////////////
17//
18//   WARNING: L (Length)
19//
20//   for L is 1, choose T = uint8_t
21//   for L in [2,3], choose T = uint16_t
22//   for L in [4,7], choose T = uint32_t
[2093]23//   for L in [8,15], choose T = uint64_t
24//   for L in [16,), choose T = BitBlock
[1950]25//
[2093]26//   WARNING: sizeof(T) <= L in the due to pointer cast.
27//              i.e !( (T*) p1 ^ (T*) p2) logic
[1950]28//
29///////////////////////////////////////////////////////////////////////////////
[1829]30
[1852]31#include "bitblock.hpp"
[1816]32#include <string.h>
33#include <stdint.h>
[1827]34#include <iostream>
[1816]35
[1852]36template<class T, uint32_t L> IDISA_ALWAYS_INLINE bool overlap_compare(const uint8_t * x, const uint8_t * y);
37template<class T> IDISA_ALWAYS_INLINE bool overlap_compare(const uint8_t * x, const uint8_t * y, uint32_t lgth);
38template<class T> IDISA_ALWAYS_INLINE bool compare(const uint8_t * x, const uint8_t * y, const uint32_t offset);
[1837]39IDISA_ALWAYS_INLINE bool mem_compare(const unsigned char * x, const unsigned char * y, uint32_t lgth);
[1816]40
[2093]41// WARNING: sizeof(T) <= L
[2046]42template<uint32_t L, class T>
[1852]43IDISA_ALWAYS_INLINE bool overlap_compare(const uint8_t * x, const uint8_t * y) {
[1833]44
[1816]45    bool accum = true;
[1852]46    uint8_t * p_x = (uint8_t*)x;
47    uint8_t * p_y = (uint8_t*)y;
[1827]48
[1816]49    for(int i=0; i < L/sizeof(T); i++) {
[1852]50        accum = accum && compare<T>(p_x,p_y,0);
51        p_x+=sizeof(T);
52        p_y+=sizeof(T);
[1816]53    }
54    if(L & (sizeof(T)-1)) {
[1852]55        accum = accum && compare<T>(x,y,L-sizeof(T));
[1828]56    }
[1816]57    return accum;
58}
59
[2093]60// WARNING: sizeof(T) <= L
[1816]61template<class T>
[1852]62IDISA_ALWAYS_INLINE bool overlap_compare(const uint8_t * x, const uint8_t * y, uint32_t lgth) {
[1837]63
64    bool accum = true;
[1852]65    uint8_t * p_x = (uint8_t*)x;
66    uint8_t * p_y = (uint8_t*)y;
[1837]67
68    for(int i=0; i < lgth/sizeof(T); i++) {
[1852]69        accum = accum && compare<T>(p_x,p_y,0);
70        p_x+=sizeof(T);
71        p_y+=sizeof(T);
[1837]72    }
73    if(lgth & (sizeof(T)-1)) {
[1852]74        accum = accum && compare<T>(x,y,lgth-sizeof(T));
[1837]75    }
76    return accum;
77}
78
[2093]79// WARNING: sizeof(T) <= L
[1837]80template<class T>
[1852]81IDISA_ALWAYS_INLINE bool compare(const uint8_t * x, const uint8_t * y, const uint32_t offset) {
[1816]82    return !((*((T*)((uint8_t *)x + offset))) ^
[2093]83             (*((T*)((uint8_t *)y + offset)))); // << offset
[1816]84}
85
86template<>
[1852]87IDISA_ALWAYS_INLINE bool compare<BitBlock>(const uint8_t * x, const uint8_t * y, const uint32_t offset) {
[1831]88    BitBlock temp = simd_xor(bitblock::load_unaligned((BitBlock*) ((uint8_t *)x + offset)),
[2093]89                             bitblock::load_unaligned((BitBlock*) ((uint8_t *)y + offset))); // << shift offset
[1816]90    return bitblock::all(simd_not(temp));
91}
92
[1837]93IDISA_ALWAYS_INLINE bool mem_compare(const unsigned char * x, const unsigned char * y, uint32_t lgth) {
94        return (0 == memcmp(x, y, lgth));
95}
96
97
[1816]98#endif // BYTE_COMPARE_HPP
99
100
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