mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.1 KiB
75 lines
2.1 KiB
/* 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
|
|
|