1  /* Copyright (C) 2004-2023 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  #if __STDC_HOSTED__
      29  #include <errno.h>
      30  #endif
      31  
      32  static __inline__ void * 
      33  _mm_malloc (size_t __size, size_t __align)
      34  {
      35    void * __malloc_ptr;
      36    void * __aligned_ptr;
      37  
      38    /* Error if align is not a power of two.  */
      39    if (__align & (__align - 1))
      40      {
      41  #if __STDC_HOSTED__
      42        errno = EINVAL;
      43  #endif
      44        return ((void *) 0);
      45      }
      46  
      47    if (__size == 0)
      48      return ((void *) 0);
      49  
      50   /* Assume malloc'd pointer is aligned at least to sizeof (void*).
      51      If necessary, add another sizeof (void*) to store the value
      52      returned by malloc. Effectively this enforces a minimum alignment
      53      of sizeof double. */     
      54      if (__align < 2 * sizeof (void *))
      55        __align = 2 * sizeof (void *);
      56  
      57    __malloc_ptr = malloc (__size + __align);
      58    if (!__malloc_ptr)
      59      return ((void *) 0);
      60  
      61    /* Align  We have at least sizeof (void *) space below malloc'd ptr. */
      62    __aligned_ptr = (void *) (((size_t) __malloc_ptr + __align)
      63  			    & ~((size_t) (__align) - 1));
      64  
      65    /* Store the original pointer just before p.  */	
      66    ((void **) __aligned_ptr)[-1] = __malloc_ptr;
      67  
      68    return __aligned_ptr;
      69  }
      70  
      71  static __inline__ void
      72  _mm_free (void *__aligned_ptr)
      73  {
      74    if (__aligned_ptr)
      75      free (((void **) __aligned_ptr)[-1]);
      76  }
      77  
      78  #endif /* _MM_MALLOC_H_INCLUDED */