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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 c121d94672cb
children 99210400e8b9
line wrap: on
line source

/*
    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_PH_IMAGE_H__
#define __SDL_PH_IMAGE_H__

#include "../../events/SDL_events_c.h"
#include "SDL_ph_video.h"

struct private_hwdata
{
    PdOffscreenContext_t *offscreenctx;
    PdOSCCreateLockParams_t crlockparam;
    PdOSCLockParams_t lockparam;
    Uint32 colorkey;
};

extern int ph_SetupImage(_THIS, SDL_Surface * screen);
extern void ph_DestroyImage(_THIS, SDL_Surface * screen);
extern int ph_SetupUpdateFunction(_THIS, SDL_Surface * screen, Uint32 flags);

extern int ph_AllocHWSurface(_THIS, SDL_Surface * surface);
extern void ph_FreeHWSurface(_THIS, SDL_Surface * surface);
extern int ph_CheckHWBlit(_THIS, SDL_Surface * src, SDL_Surface * dst);
extern int ph_FillHWRect(_THIS, SDL_Surface * surface, SDL_Rect * rect,
                         Uint32 color);
extern int ph_LockHWSurface(_THIS, SDL_Surface * surface);
extern void ph_UnlockHWSurface(_THIS, SDL_Surface * surface);
extern int ph_FlipHWSurface(_THIS, SDL_Surface * surface);
extern int ph_SetHWColorKey(_THIS, SDL_Surface * surface, Uint32 key);
extern int ph_SetHWAlpha(_THIS, SDL_Surface * surface, Uint8 alpha);
extern int ph_HWAccelBlit(SDL_Surface * src, SDL_Rect * srcrect,
                          SDL_Surface * dst, SDL_Rect * dstrect);
extern int ph_UpdateHWInfo(_THIS);

extern void ph_NormalUpdate(_THIS, int numrects, SDL_Rect * rects);
extern void ph_OCUpdate(_THIS, int numrects, SDL_Rect * rects);
extern void ph_OCDCUpdate(_THIS, int numrects, SDL_Rect * rects);
extern void ph_OpenGLUpdate(_THIS, int numrects, SDL_Rect * rects);

#endif /* __SDL_PH_IMAGE_H__ */
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