| 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 : Sat Nov 16 18:58:22 2019
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| 13 | // Update Count : 3
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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 | // gcc-7 uses xmms instructions, which require 16 byte alignment.
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| 37 | #define libAlign() (16)
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| 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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