comparison src/fftw-3.3.8/kernel/kalloc.c @ 82:d0c2a83c1364

Add FFTW 3.3.8 source, and a Linux build

+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+
+#include "kernel/ifftw.h"
+
+#if defined(HAVE_MALLOC_H)
+#  include <malloc.h>
+#endif
+
+/* ``kernel'' malloc(), with proper memory alignment */
+
+#if defined(HAVE_DECL_MEMALIGN) && !HAVE_DECL_MEMALIGN
+extern void *memalign(size_t, size_t);
+#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 */
+
+#define IS_POWER_OF_TWO(n) (((n) > 0) && (((n) & ((n) - 1)) == 0))
+#if defined(WITH_OUR_MALLOC) && (MIN_ALIGNMENT >= 8) && IS_POWER_OF_TWO(MIN_ALIGNMENT)
+/* Our own MIN_ALIGNMENT-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_malloc(size_t n)
+{
+     void *p0, *p;
+     if (!(p0 = malloc(n + MIN_ALIGNMENT))) return (void *) 0;
+     p = (void *) (((uintptr_t) p0 + MIN_ALIGNMENT) & (~((uintptr_t) (MIN_ALIGNMENT - 1))));
+     *((void **) p - 1) = p0;
+     return p;
+}
+static void our_free(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_MALLOC)
+     p = our_malloc(n);
+#    undef real_free
+#    define real_free our_free
+
+#  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 [e-mail] 
+        or (e.g. for Windows) configure --with-our-malloc */
+#    error "Don't know how to malloc() aligned memory ... try configuring --with-our-malloc"
+#  endif
+
+#else /* !defined(MIN_ALIGNMENT) */
+     p = malloc(n);
+#endif
+
+     return p;
+}
+
+void X(kernel_free)(void *p)
+{
+     real_free(p);
+}