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1 /* Copyright (C) 2004, 2009 Free Software Foundation, Inc.
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2
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3 This file is part of GCC.
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4
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5 GCC is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3, or (at your option)
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8 any later version.
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9
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10 GCC is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 Under Section 7 of GPL version 3, you are granted additional
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16 permissions described in the GCC Runtime Library Exception, version
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17 3.1, as published by the Free Software Foundation.
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18
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19 You should have received a copy of the GNU General Public License and
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20 a copy of the GCC Runtime Library Exception along with this program;
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21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 <http://www.gnu.org/licenses/>. */
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23
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24 #ifndef _MM_MALLOC_H_INCLUDED
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25 #define _MM_MALLOC_H_INCLUDED
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26
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27 #include <stdlib.h>
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28 #include <errno.h>
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29
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30 static __inline__ void*
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31 _mm_malloc (size_t size, size_t align)
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32 {
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33 void * malloc_ptr;
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34 void * aligned_ptr;
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35
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36 /* Error if align is not a power of two. */
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37 if (align & (align - 1))
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38 {
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39 errno = EINVAL;
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40 return ((void*) 0);
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41 }
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42
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43 if (size == 0)
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44 return ((void *) 0);
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45
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46 /* Assume malloc'd pointer is aligned at least to sizeof (void*).
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47 If necessary, add another sizeof (void*) to store the value
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48 returned by malloc. Effectively this enforces a minimum alignment
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49 of sizeof double. */
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50 if (align < 2 * sizeof (void *))
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51 align = 2 * sizeof (void *);
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52
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53 malloc_ptr = malloc (size + align);
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54 if (!malloc_ptr)
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55 return ((void *) 0);
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56
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57 /* Align We have at least sizeof (void *) space below malloc'd ptr. */
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58 aligned_ptr = (void *) (((size_t) malloc_ptr + align)
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59 & ~((size_t) (align) - 1));
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60
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61 /* Store the original pointer just before p. */
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62 ((void **) aligned_ptr) [-1] = malloc_ptr;
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63
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64 return aligned_ptr;
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65 }
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66
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67 static __inline__ void
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68 _mm_free (void * aligned_ptr)
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69 {
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70 if (aligned_ptr)
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71 free (((void **) aligned_ptr) [-1]);
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72 }
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73
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74 #endif /* _MM_MALLOC_H_INCLUDED */
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