[78b3f52] | 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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[73abe95] | 7 | // align.hfa -- |
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[78b3f52] | 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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[91c389a] | 11 | // Last Modified By : Peter A. Buhr |
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[1c40091] | 12 | // Last Modified On : Sat Nov 16 18:58:22 2019 |
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| 13 | // Update Count : 3 |
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[78b3f52] | 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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[2ac095d] | 19 | // |
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[78b3f52] | 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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[2ac095d] | 24 | // |
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[78b3f52] | 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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[2ac095d] | 27 | // |
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[78b3f52] | 28 | |
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[6b0b624] | 29 | #pragma once |
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[78b3f52] | 30 | |
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[91c389a] | 31 | #include <assert.h> |
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[2ac095d] | 32 | #include <stdbool.h> |
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[78b3f52] | 33 | |
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[2ac095d] | 34 | // Minimum size used to align memory boundaries for memory allocations. |
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[1c40091] | 35 | //#define libAlign() (sizeof(double)) |
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| 36 | // gcc-7 uses xmms instructions, which require 16 byte alignment. |
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| 37 | #define libAlign() (16) |
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[78b3f52] | 38 | |
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| 39 | // Check for power of 2 |
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| 40 | static inline bool libPow2( unsigned long int value ) { |
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| 41 | // clears all bits below value, rounding value down to the next lower multiple of value |
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| 42 | return (value & (value - 1ul)) == 0ul; |
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| 43 | } // libPow2 |
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| 44 | |
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| 45 | |
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| 46 | // Returns value aligned at the floor of align. |
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| 47 | static inline unsigned long int libFloor( unsigned long int value, unsigned long int align ) { |
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| 48 | assert( libPow2( align ) ); |
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| 49 | // clears all bits above or equal to align, getting (value % align), the phase of value with regards to align |
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| 50 | return value & -align; |
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| 51 | } // libFloor |
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| 52 | |
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| 53 | |
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| 54 | // Returns value aligned at the ceiling of align. |
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| 55 | |
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| 56 | static inline unsigned long int libCeiling( unsigned long int value, unsigned long int align ) { |
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| 57 | assert( libPow2( align ) ); |
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| 58 | // "negate, round down, negate" is the same as round up |
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| 59 | return -libFloor( -value, align ); |
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| 60 | } // uCeiling |
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| 61 | |
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| 62 | // Local Variables: // |
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| 63 | // compile-command: "make install" // |
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| 64 | // End: // |
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