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comparison gcc/config/i386/gmm_malloc.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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children 04ced10e8804
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-1:000000000000 0:a06113de4d67
1 /* Copyright (C) 2004, 2009 Free Software Foundation, Inc.
2
3 This file is part of GCC.
4
5 GCC is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3, or (at your option)
8 any later version.
9
10 GCC is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
18
19 You should have received a copy of the GNU General Public License and
20 a copy of the GCC Runtime Library Exception along with this program;
21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 <http://www.gnu.org/licenses/>. */
23
24 #ifndef _MM_MALLOC_H_INCLUDED
25 #define _MM_MALLOC_H_INCLUDED
26
27 #include <stdlib.h>
28 #include <errno.h>
29
30 static __inline__ void*
31 _mm_malloc (size_t size, size_t align)
32 {
33 void * malloc_ptr;
34 void * aligned_ptr;
35
36 /* Error if align is not a power of two. */
37 if (align & (align - 1))
38 {
39 errno = EINVAL;
40 return ((void*) 0);
41 }
42
43 if (size == 0)
44 return ((void *) 0);
45
46 /* Assume malloc'd pointer is aligned at least to sizeof (void*).
47 If necessary, add another sizeof (void*) to store the value
48 returned by malloc. Effectively this enforces a minimum alignment
49 of sizeof double. */
50 if (align < 2 * sizeof (void *))
51 align = 2 * sizeof (void *);
52
53 malloc_ptr = malloc (size + align);
54 if (!malloc_ptr)
55 return ((void *) 0);
56
57 /* Align We have at least sizeof (void *) space below malloc'd ptr. */
58 aligned_ptr = (void *) (((size_t) malloc_ptr + align)
59 & ~((size_t) (align) - 1));
60
61 /* Store the original pointer just before p. */
62 ((void **) aligned_ptr) [-1] = malloc_ptr;
63
64 return aligned_ptr;
65 }
66
67 static __inline__ void
68 _mm_free (void * aligned_ptr)
69 {
70 if (aligned_ptr)
71 free (((void **) aligned_ptr) [-1]);
72 }
73
74 #endif /* _MM_MALLOC_H_INCLUDED */