1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // align.hfa -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Mon Nov 28 12:27:26 2016 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Fri Jul 21 23:05:35 2017 |
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13 | // Update Count : 2 |
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14 | // |
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15 | // This library is free software; you can redistribute it and/or modify it |
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16 | // under the terms of the GNU Lesser General Public License as published by the |
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17 | // Free Software Foundation; either version 2.1 of the License, or (at your |
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18 | // option) any later version. |
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19 | // |
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20 | // This library is distributed in the hope that it will be useful, but WITHOUT |
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21 | // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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22 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License |
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23 | // for more details. |
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24 | // |
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25 | // You should have received a copy of the GNU Lesser General Public License |
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26 | // along with this library. |
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27 | // |
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28 | |
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29 | #pragma once |
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30 | |
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31 | #include <assert.h> |
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32 | #include <stdbool.h> |
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33 | |
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34 | // Minimum size used to align memory boundaries for memory allocations. |
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35 | #define libAlign() (sizeof(double)) |
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36 | |
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37 | // Check for power of 2 |
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38 | static inline bool libPow2( unsigned long int value ) { |
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39 | // clears all bits below value, rounding value down to the next lower multiple of value |
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40 | return (value & (value - 1ul)) == 0ul; |
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41 | } // libPow2 |
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42 | |
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43 | |
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44 | // Returns value aligned at the floor of align. |
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45 | static inline unsigned long int libFloor( unsigned long int value, unsigned long int align ) { |
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46 | assert( libPow2( align ) ); |
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47 | // clears all bits above or equal to align, getting (value % align), the phase of value with regards to align |
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48 | return value & -align; |
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49 | } // libFloor |
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50 | |
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51 | |
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52 | // Returns value aligned at the ceiling of align. |
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53 | |
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54 | static inline unsigned long int libCeiling( unsigned long int value, unsigned long int align ) { |
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55 | assert( libPow2( align ) ); |
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56 | // "negate, round down, negate" is the same as round up |
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57 | return -libFloor( -value, align ); |
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58 | } // uCeiling |
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59 | |
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60 | // Local Variables: // |
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61 | // compile-command: "make install" // |
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62 | // End: // |
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