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      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 <stddef.h>
     28 
     29 #ifdef _WIN32
     30 #include <malloc.h>
     31 #else
     32 
     33 // Forward declare allocation functions to allow this header to parse without
     34 // any system headers.
     35 #ifndef __cplusplus
     36 extern void free(void *ptr);
     37 extern void *malloc(size_t size) __attribute__((__malloc__));
     38 extern int posix_memalign(void **memptr, size_t alignment, size_t size);
     39 #else
     40 // Some systems (e.g. those with GNU libc) declare some of these functions with
     41 // an exception specifier. Via an "egregious workaround" in
     42 // Sema::CheckEquivalentExceptionSpec, Clang accepts the following as valid
     43 // redeclarations of glibc's declarations.
     44 extern "C" void free(void *ptr);
     45 extern "C" void *malloc(size_t size) __attribute__((__malloc__));
     46 extern "C" int posix_memalign(void **memptr, size_t alignment, size_t size);
     47 #endif
     48 
     49 #endif
     50 
     51 static __inline__ void *__attribute__((__always_inline__, __nodebug__,
     52                                        __malloc__))
     53 _mm_malloc(size_t size, size_t align)
     54 {
     55   if (align == 1) {
     56     return malloc(size);
     57   }
     58 
     59   if (!(align & (align - 1)) && align < sizeof(void *))
     60     align = sizeof(void *);
     61 
     62   void *mallocedMemory;
     63 #ifdef _WIN32
     64   mallocedMemory = _aligned_malloc(size, align);
     65 #else
     66   if (posix_memalign(&mallocedMemory, align, size))
     67     return 0;
     68 #endif
     69 
     70   return mallocedMemory;
     71 }
     72 
     73 static __inline__ void __attribute__((__always_inline__, __nodebug__))
     74 _mm_free(void *p)
     75 {
     76   free(p);
     77 }
     78 
     79 #endif /* __MM_MALLOC_H */
     80