-
-
Notifications
You must be signed in to change notification settings - Fork 264
/
zutil_p.h
75 lines (61 loc) · 2.08 KB
/
zutil_p.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/* zutil_p.h -- Private inline functions used internally in zlib-ng
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#ifndef ZUTIL_P_H
#define ZUTIL_P_H
#if defined(__APPLE__) || defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_ALIGNED_ALLOC)
# include <stdlib.h>
#elif defined(__FreeBSD__)
# include <stdlib.h>
# include <malloc_np.h>
#else
# include <malloc.h>
#endif
/* Function to allocate 16 or 64-byte aligned memory */
static inline void *zng_alloc(size_t size) {
#ifdef HAVE_ALIGNED_ALLOC
/* Size must be a multiple of alignment */
size = (size + (64 - 1)) & ~(64 - 1);
return (void *)aligned_alloc(64, size); /* Defined in C11 */
#elif defined(HAVE_POSIX_MEMALIGN)
void *ptr;
return posix_memalign(&ptr, 64, size) ? NULL : ptr;
#elif defined(_WIN32)
return (void *)_aligned_malloc(size, 64);
#elif defined(__APPLE__)
/* Fallback for when posix_memalign and aligned_alloc are not available.
* On macOS, it always aligns to 16 bytes. */
return (void *)malloc(size);
#else
return (void *)memalign(64, size);
#endif
}
/* Function that can free aligned memory */
static inline void zng_free(void *ptr) {
#if defined(_WIN32)
_aligned_free(ptr);
#else
free(ptr);
#endif
}
/* Use memcpy instead of memcmp to avoid older compilers not converting memcmp calls to
unaligned comparisons when unaligned access is supported. */
static inline int32_t zng_memcmp_2(const void *src0, const void *src1) {
uint16_t src0_cmp, src1_cmp;
memcpy(&src0_cmp, src0, sizeof(src0_cmp));
memcpy(&src1_cmp, src1, sizeof(src1_cmp));
return src0_cmp != src1_cmp;
}
static inline int32_t zng_memcmp_4(const void *src0, const void *src1) {
uint32_t src0_cmp, src1_cmp;
memcpy(&src0_cmp, src0, sizeof(src0_cmp));
memcpy(&src1_cmp, src1, sizeof(src1_cmp));
return src0_cmp != src1_cmp;
}
static inline int32_t zng_memcmp_8(const void *src0, const void *src1) {
uint64_t src0_cmp, src1_cmp;
memcpy(&src0_cmp, src0, sizeof(src0_cmp));
memcpy(&src1_cmp, src1, sizeof(src1_cmp));
return src0_cmp != src1_cmp;
}
#endif