view Lib/fftw-3.2.1/libbench2/aligned-main.c @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

/*
 * Copyright (c) 2001 Matteo Frigo
 * Copyright (c) 2001 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
 *
 */


#include "bench.h"

int aligned_main(int argc, char *argv[])
{
#if defined(__GNUC__) && defined(__i386__)
     /*
      * horrible hack to align the stack to a 16-byte boundary.
      *
      * We assume a gcc version >= 2.95 so that
      * -mpreferred-stack-boundary works.  Otherwise, all bets are
      * off.  However, -mpreferred-stack-boundary does not create a
      * stack alignment, but it only preserves it.  Unfortunately,
      * many versions of libc on linux call main() with the wrong
      * initial stack alignment, with the result that the code is now
      * pessimally aligned instead of having a 50% chance of being
      * correct.
      */
     {
	  /*
	   * Use alloca to allocate some memory on the stack.
	   * This alerts gcc that something funny is going
	   * on, so that it does not omit the frame pointer
	   * etc.
	   */
	  (void)__builtin_alloca(16); 

	  /*
	   * Now align the stack pointer
	   */
	  __asm__ __volatile__ ("andl $-16, %esp");

#  ifdef FFTW_DEBUG_ALIGNMENT
	  /* pessimally align the stack, in order to check whether the
	     stack re-alignment hacks in FFTW3 work */
	  __asm__ __volatile__ ("addl $-4, %esp");
#  endif
     }
#endif

#ifdef __ICC /* Intel's compiler for ia32 */
     {
	  /*
	   * Simply calling alloca seems to do the right thing. 
	   * The size of the allocated block seems to be irrelevant.
	   */
	  _alloca(16);
     }
#endif

     return bench_main(argc, argv);
}