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http://sources.redhat.com/ml/newlib/2002/msg00230.html Stephen L Moshier wrote: > > pow(x,y) returns 0 when x is very close to -1.0 and y is very large. > The following test program prints > > pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00 > pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00 > pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01 > pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00 > > which is incorrect for the negative arguments raised to an odd integer > power. > > ----- > double pow (double, double); > > int > main () > { > double x, y, z; > > x = 1.0 + pow (2.0, -52.0); > y = 1.0 + pow (2.0, 52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = 1.0 - pow (2.0, -52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > } > ----- > > Here is a patch for newlib/libm/math/epow.c: Patch checked in and duplicated for ef_pow.c. Thanks. -- Jeff J.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Sep 2008 04:31:30 +0000
parents 204be4fc2726
children 99210400e8b9
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_thread_c_h
#define _SDL_thread_c_h

/* Need the definitions of SYS_ThreadHandle */
#if SDL_THREADS_DISABLED
#include "generic/SDL_systhread_c.h"
#elif SDL_THREAD_BEOS
#include "beos/SDL_systhread_c.h"
#elif SDL_THREAD_DC
#include "dc/SDL_systhread_c.h"
#elif SDL_THREAD_EPOC
#include "epoc/SDL_systhread_c.h"
#elif SDL_THREAD_OS2
#include "os2/SDL_systhread_c.h"
#elif SDL_THREAD_PTH
#include "pth/SDL_systhread_c.h"
#elif SDL_THREAD_PTHREAD
#include "pthread/SDL_systhread_c.h"
#elif SDL_THREAD_SPROC
#include "irix/SDL_systhread_c.h"
#elif SDL_THREAD_WIN32
#include "win32/SDL_systhread_c.h"
#elif SDL_THREAD_NDS
#include "nds/SDL_systhread_c.h"
#else
#error Need thread implementation for this platform
#include "generic/SDL_systhread_c.h"
#endif
#include "../SDL_error_c.h"

/* This is the system-independent thread info structure */
struct SDL_Thread
{
    Uint32 threadid;
    SYS_ThreadHandle handle;
    int status;
    SDL_error errbuf;
    void *data;
};

/* This is the function called to run a thread */
extern void SDL_RunThread(void *data);

#endif /* _SDL_thread_c_h */
/* vi: set ts=4 sw=4 expandtab: */