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/*
* Copyright (c) 2003, 2006 Matteo Frigo
* Copyright (c) 2003, 2006 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* $Id: kalloc.c,v 1.6 2006-01-25 23:00:04 stevenj Exp $ */
#include "ifftw.h"
/* ``kernel'' malloc(), with proper memory alignment */
#if defined(HAVE_DECL_MEMALIGN) && !HAVE_DECL_MEMALIGN
# if defined(HAVE_MALLOC_H)
# include <malloc.h>
# else
extern void *memalign(size_t, size_t);
# endif
#endif
#if defined(HAVE_DECL_POSIX_MEMALIGN) && !HAVE_DECL_POSIX_MEMALIGN
extern int posix_memalign(void **, size_t, size_t);
#endif
#if defined(macintosh) /* MacOS 9 */
# include <Multiprocessing.h>
#endif
#define real_free free /* memalign and malloc use ordinary free */
#if defined(WITH_OUR_MALLOC16) && (MIN_ALIGNMENT == 16)
/* Our own 16-byte aligned malloc/free. Assumes sizeof(void*) is a
power of two <= 8 and that malloc is at least sizeof(void*)-aligned.
The main reason for this routine is that, as of this writing,
Windows does not include any aligned allocation routines in its
system libraries, and instead provides an implementation with a
Visual C++ "Processor Pack" that you have to statically link into
your program. We do not want to require users to have VC++
(e.g. gcc/MinGW should be fine). Our code should be at least as good
as the MS _aligned_malloc, in any case, according to second-hand
reports of the algorithm it employs (also based on plain malloc). */
static void *our_malloc16(size_t n)
{
void *p0, *p;
if (!(p0 = malloc(n + 16))) return (void *) 0;
p = (void *) (((uintptr_t) p0 + 16) & (~((uintptr_t) 15)));
*((void **) p - 1) = p0;
return p;
}
static void our_free16(void *p)
{
if (p) free(*((void **) p - 1));
}
#endif
void *X(kernel_malloc)(size_t n)
{
void *p;
#if defined(MIN_ALIGNMENT)
# if defined(WITH_OUR_MALLOC16) && (MIN_ALIGNMENT == 16)
p = our_malloc16(n);
# undef real_free
# define real_free our_free16
# elif defined(__FreeBSD__) && (MIN_ALIGNMENT <= 16)
/* FreeBSD does not have memalign, but its malloc is 16-byte aligned. */
p = malloc(n);
# elif (defined(__MACOSX__) || defined(__APPLE__)) && (MIN_ALIGNMENT <= 16)
/* MacOS X malloc is already 16-byte aligned */
p = malloc(n);
# elif defined(HAVE_MEMALIGN)
p = memalign(MIN_ALIGNMENT, n);
# elif defined(HAVE_POSIX_MEMALIGN)
/* note: posix_memalign is broken in glibc 2.2.5: it constrains
the size, not the alignment, to be (power of two) * sizeof(void*).
The bug seems to have been fixed as of glibc 2.3.1. */
if (posix_memalign(&p, MIN_ALIGNMENT, n))
p = (void*) 0;
# elif defined(__ICC) || defined(__INTEL_COMPILER) || defined(HAVE__MM_MALLOC)
/* Intel's C compiler defines _mm_malloc and _mm_free intrinsics */
p = (void *) _mm_malloc(n, MIN_ALIGNMENT);
# undef real_free
# define real_free _mm_free
# elif defined(_MSC_VER)
/* MS Visual C++ 6.0 with a "Processor Pack" supports SIMD
and _aligned_malloc/free (uses malloc.h) */
p = (void *) _aligned_malloc(n, MIN_ALIGNMENT);
# undef real_free
# define real_free _aligned_free
# elif defined(macintosh) /* MacOS 9 */
p = (void *) MPAllocateAligned(n,
# if MIN_ALIGNMENT == 8
kMPAllocate8ByteAligned,
# elif MIN_ALIGNMENT == 16
kMPAllocate16ByteAligned,
# elif MIN_ALIGNMENT == 32
kMPAllocate32ByteAligned,
# else
# error "Unknown alignment for MPAllocateAligned"
# endif
0);
# undef real_free
# define real_free MPFree
# else
/* Add your machine here and send a patch to fftw@fftw.org
or (e.g. for Windows) configure --with-our-malloc16 */
# error "Don't know how to malloc() aligned memory ... try configuring --with-our-malloc16"
# endif
#else /* !defined(MIN_ALIGNMENT) */
p = malloc(n);
#endif
return p;
}
void X(kernel_free)(void *p)
{
real_free(p);
}
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