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.

/* $XFree86: xc/include/extensions/Xinerama.h,v 3.2 2000/03/01 01:04:20 dawes Exp $ */

#ifndef _Xinerama_h
#define _Xinerama_h

#include "SDL_name.h"

typedef struct
{
    int screen_number;
    short x_org;
    short y_org;
    short width;
    short height;
} SDL_NAME(XineramaScreenInfo);

Bool SDL_NAME(XineramaQueryExtension) (Display * dpy,
                                       int *event_base, int *error_base);

Status SDL_NAME(XineramaQueryVersion) (Display * dpy, int *major, int *minor);

Bool SDL_NAME(XineramaIsActive) (Display * dpy);


/* 
   Returns the number of heads and a pointer to an array of
   structures describing the position and size of the individual
   heads.  Returns NULL and number = 0 if Xinerama is not active.
  
   Returned array should be freed with XFree().
*/

SDL_NAME(XineramaScreenInfo) *
SDL_NAME(XineramaQueryScreens) (Display * dpy, int *number);

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