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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 dea73e1d07b0
children
line wrap: on
line source

/*
 * Copyright 1993-2001 by Xi Graphics, Inc.
 * All Rights Reserved.
 *
 * Please see the LICENSE file accompanying this distribution for licensing 
 * information. 
 *
 * Please send any bug fixes and modifications to src@xig.com.
 *
 * $XiGId: xme.h,v 1.1.1.1 2001/11/19 19:01:10 jon Exp $
 *
 */


#ifndef _XME_H_INCLUDED
#define _XME_H_INCLUDED

typedef struct
{
    short x;
    short y;
    unsigned short w;
    unsigned short h;
} XiGMiscViewInfo;

typedef struct
{
    unsigned short width;
    unsigned short height;
    int refresh;
} XiGMiscResolutionInfo;

extern Bool XiGMiscQueryVersion(Display * dpy, int *major, int *minor);
extern int XiGMiscQueryViews(Display * dpy, int screen,
                             XiGMiscViewInfo ** pviews);
extern int XiGMiscQueryResolutions(Display * dpy, int screen, int view,
                                   int *pactive,
                                   XiGMiscResolutionInfo ** presolutions);
extern void XiGMiscChangeResolution(Display * dpy, int screen, int view,
                                    int width, int height, int refresh);

/* SDL addition from Ryan: free memory used by xme. */
extern void XiGMiscDestroy(void);

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