C:/knet/include/kNet/Alignment.h
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00001 /* Copyright 2010 Jukka Jylänki 00002 00003 Licensed under the Apache License, Version 2.0 (the "License"); 00004 you may not use this file except in compliance with the License. 00005 You may obtain a copy of the License at 00006 00007 http://www.apache.org/licenses/LICENSE-2.0 00008 00009 Unless required by applicable law or agreed to in writing, software 00010 distributed under the License is distributed on an "AS IS" BASIS, 00011 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00012 See the License for the specific language governing permissions and 00013 limitations under the License. */ 00014 #pragma once 00015 00019 #include <cassert> 00020 00021 #include "Types.h" 00022 00023 #ifdef LINUX 00024 #include <stdint.h> 00025 #endif 00026 00027 namespace kNet 00028 { 00029 00031 #define IS_POW2(value) (((value) & ((value)-1)) == 0) 00032 00034 inline bool IsPow2Aligned(uintptr_t pointer, u32 alignment) 00035 { 00036 assert(IS_POW2(alignment)); 00037 return (pointer & (alignment - 1)) == 0; 00038 } 00039 00041 inline uintptr_t AlignUpPow2(uintptr_t pointer, u32 alignment) 00042 { 00043 assert(IS_POW2(alignment)); 00044 return (pointer + alignment - 1) & ~((uintptr_t)alignment - 1); 00045 } 00046 00048 inline uintptr_t AlignDownPow2(uintptr_t pointer, u32 alignment) 00049 { 00050 assert(IS_POW2(alignment)); 00051 return pointer & ~((uintptr_t)alignment - 1); 00052 } 00053 00054 inline u32 RoundUpToNextPow2(u32 x) 00055 { 00056 x = x - 1; 00057 x = x | (x >> 1); 00058 x = x | (x >> 2); 00059 x = x | (x >> 4); 00060 x = x | (x >> 8); 00061 x = x | (x >> 16); 00062 return x + 1; 00063 } 00064 00065 inline u64 RoundUpToNextPow2(u64 x) 00066 { 00067 x = x - 1; 00068 x = x | (x >> 1); 00069 x = x | (x >> 2); 00070 x = x | (x >> 4); 00071 x = x | (x >> 8); 00072 x = x | (x >> 16); 00073 x = x | (x >> 32); 00074 return x + 1; 00075 } 00076 00077 } // ~kNet
