1 /*===---- mm_malloc.h - Allocating and Freeing Aligned Memory Blocks -------=== 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to deal 5 * in the Software without restriction, including without limitation the rights 6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 * copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 * THE SOFTWARE. 20 * 21 *===-----------------------------------------------------------------------=== 22 */ 23 24 #ifndef __MM_MALLOC_H 25 #define __MM_MALLOC_H 26 27 #include <errno.h> 28 #include <stdlib.h> 29 30 static __inline__ void *__attribute__((__always_inline__, __nodebug__)) 31 _mm_malloc(size_t size, size_t align) 32 { 33 if (align & (align - 1)) { 34 errno = EINVAL; 35 return 0; 36 } 37 38 if (!size) 39 return 0; 40 41 if (align < 2 * sizeof(void *)) 42 align = 2 * sizeof(void *); 43 44 void *mallocedMemory = malloc(size + align); 45 if (!mallocedMemory) 46 return 0; 47 48 void *alignedMemory = 49 (void *)(((size_t)mallocedMemory + align) & ~((size_t)align - 1)); 50 ((void **)alignedMemory)[-1] = mallocedMemory; 51 52 return alignedMemory; 53 } 54 55 static __inline__ void __attribute__((__always_inline__, __nodebug__)) 56 _mm_free(void *p) 57 { 58 if (p) 59 free(((void **)p)[-1]); 60 } 61 62 #endif /* __MM_MALLOC_H */ 63
