mirror of
https://github.com/tildearrow/furnace.git
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144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "kernel/ifftw.h"
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#if defined(HAVE_MALLOC_H)
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# include <malloc.h>
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#endif
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/* ``kernel'' malloc(), with proper memory alignment */
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#if defined(HAVE_DECL_MEMALIGN) && !HAVE_DECL_MEMALIGN
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extern void *memalign(size_t, size_t);
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#endif
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#if defined(HAVE_DECL_POSIX_MEMALIGN) && !HAVE_DECL_POSIX_MEMALIGN
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extern int posix_memalign(void **, size_t, size_t);
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#endif
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#if defined(macintosh) /* MacOS 9 */
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# include <Multiprocessing.h>
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#endif
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#define real_free free /* memalign and malloc use ordinary free */
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#define IS_POWER_OF_TWO(n) (((n) > 0) && (((n) & ((n) - 1)) == 0))
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#if defined(WITH_OUR_MALLOC) && (MIN_ALIGNMENT >= 8) && IS_POWER_OF_TWO(MIN_ALIGNMENT)
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/* Our own MIN_ALIGNMENT-aligned malloc/free. Assumes sizeof(void*) is a
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power of two <= 8 and that malloc is at least sizeof(void*)-aligned.
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The main reason for this routine is that, as of this writing,
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Windows does not include any aligned allocation routines in its
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system libraries, and instead provides an implementation with a
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Visual C++ "Processor Pack" that you have to statically link into
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your program. We do not want to require users to have VC++
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(e.g. gcc/MinGW should be fine). Our code should be at least as good
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as the MS _aligned_malloc, in any case, according to second-hand
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reports of the algorithm it employs (also based on plain malloc). */
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static void *our_malloc(size_t n)
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{
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void *p0, *p;
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if (!(p0 = malloc(n + MIN_ALIGNMENT))) return (void *) 0;
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p = (void *) (((uintptr_t) p0 + MIN_ALIGNMENT) & (~((uintptr_t) (MIN_ALIGNMENT - 1))));
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*((void **) p - 1) = p0;
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return p;
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}
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static void our_free(void *p)
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{
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if (p) free(*((void **) p - 1));
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}
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#endif
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void *X(kernel_malloc)(size_t n)
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{
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void *p;
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#if defined(MIN_ALIGNMENT)
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# if defined(WITH_OUR_MALLOC)
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p = our_malloc(n);
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# undef real_free
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# define real_free our_free
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# elif defined(__FreeBSD__) && (MIN_ALIGNMENT <= 16)
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/* FreeBSD does not have memalign, but its malloc is 16-byte aligned. */
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p = malloc(n);
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# elif (defined(__MACOSX__) || defined(__APPLE__)) && (MIN_ALIGNMENT <= 16)
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/* MacOS X malloc is already 16-byte aligned */
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p = malloc(n);
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# elif defined(HAVE_MEMALIGN)
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p = memalign(MIN_ALIGNMENT, n);
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# elif defined(HAVE_POSIX_MEMALIGN)
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/* note: posix_memalign is broken in glibc 2.2.5: it constrains
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the size, not the alignment, to be (power of two) * sizeof(void*).
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The bug seems to have been fixed as of glibc 2.3.1. */
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if (posix_memalign(&p, MIN_ALIGNMENT, n))
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p = (void*) 0;
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# elif defined(__ICC) || defined(__INTEL_COMPILER) || defined(HAVE__MM_MALLOC)
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/* Intel's C compiler defines _mm_malloc and _mm_free intrinsics */
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p = (void *) _mm_malloc(n, MIN_ALIGNMENT);
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# undef real_free
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# define real_free _mm_free
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# elif defined(_MSC_VER)
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/* MS Visual C++ 6.0 with a "Processor Pack" supports SIMD
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and _aligned_malloc/free (uses malloc.h) */
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p = (void *) _aligned_malloc(n, MIN_ALIGNMENT);
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# undef real_free
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# define real_free _aligned_free
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# elif defined(macintosh) /* MacOS 9 */
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p = (void *) MPAllocateAligned(n,
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# if MIN_ALIGNMENT == 8
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kMPAllocate8ByteAligned,
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# elif MIN_ALIGNMENT == 16
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kMPAllocate16ByteAligned,
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# elif MIN_ALIGNMENT == 32
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kMPAllocate32ByteAligned,
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# else
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# error "Unknown alignment for MPAllocateAligned"
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# endif
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0);
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# undef real_free
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# define real_free MPFree
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# else
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/* Add your machine here and send a patch to fftw@fftw.org
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or (e.g. for Windows) configure --with-our-malloc */
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# error "Don't know how to malloc() aligned memory ... try configuring --with-our-malloc"
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# endif
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#else /* !defined(MIN_ALIGNMENT) */
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p = malloc(n);
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#endif
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return p;
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}
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void X(kernel_free)(void *p)
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{
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real_free(p);
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}
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