Mercurial > sdl-ios-xcode
view Makefile.dc @ 2752:edd2839b36f7
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 | b7a48f533966 |
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#GL=1 CC = sh-elf-gcc AR = sh-elf-ar ifdef GL DEFS += -DSDL_VIDEO_OPENGL=1 TARGET = libSDL_gl.a else TARGET = libSDL.a endif CFLAGS=$(KOS_CFLAGS) $(DEFS) -Iinclude SRCS = \ src/audio/dc/SDL_dcaudio.c \ src/audio/dc/aica.c \ src/audio/dummy/SDL_dummyaudio.c \ src/audio/SDL_audio.c \ src/audio/SDL_audiocvt.c \ src/audio/SDL_audiodev.c \ src/audio/SDL_mixer.c \ src/audio/SDL_wave.c \ src/cdrom/dc/SDL_syscdrom.c \ src/cdrom/SDL_cdrom.c \ src/events/SDL_active.c \ src/events/SDL_events.c \ src/events/SDL_expose.c \ src/events/SDL_keyboard.c \ src/events/SDL_mouse.c \ src/events/SDL_quit.c \ src/events/SDL_resize.c \ src/file/SDL_rwops.c \ src/joystick/dc/SDL_sysjoystick.c \ src/joystick/SDL_joystick.c \ src/loadso/dummy/SDL_sysloadso.c \ src/SDL.c \ src/SDL_error.c \ src/SDL_fatal.c \ src/stdlib/SDL_getenv.c \ src/stdlib/SDL_iconv.c \ src/stdlib/SDL_malloc.c \ src/stdlib/SDL_qsort.c \ src/stdlib/SDL_stdlib.c \ src/stdlib/SDL_string.c \ src/thread/dc/SDL_syscond.c \ src/thread/dc/SDL_sysmutex.c \ src/thread/dc/SDL_syssem.c \ src/thread/dc/SDL_systhread.c \ src/thread/SDL_thread.c \ src/timer/dc/SDL_systimer.c \ src/timer/SDL_timer.c \ src/video/dc/SDL_dcevents.c \ src/video/dc/SDL_dcvideo.c \ src/video/dummy/SDL_nullevents.c \ src/video/dummy/SDL_nullmouse.c \ src/video/dummy/SDL_nullvideo.c \ src/video/glsdl/SDL_glsdl.c \ src/video/SDL_blit.c \ src/video/SDL_blit_0.c \ src/video/SDL_blit_1.c \ src/video/SDL_blit_A.c \ src/video/SDL_blit_N.c \ src/video/SDL_bmp.c \ src/video/SDL_cursor.c \ src/video/SDL_gamma.c \ src/video/SDL_pixels.c \ src/video/SDL_RLEaccel.c \ src/video/SDL_stretch.c \ src/video/SDL_surface.c \ src/video/SDL_video.c \ src/video/SDL_yuv.c \ src/video/SDL_yuv_sw.c \ OBJS = $(SRCS:.c=.o) TEST = \ test/checkkeys.c \ test/graywin.c \ test/loopwave.c \ test/testalpha.c \ test/testbitmap.c \ test/testcdrom.c \ test/testerror.c \ test/testgamma.c \ test/testgl.c \ test/testhread.c \ test/testjoystick.c \ test/testkeys.c \ test/testlock.c \ test/testoverlay.c \ test/testpalette.c \ test/testsem.c \ test/testsprite.c \ test/testtimer.c \ test/testtypes.c \ test/testver.c \ test/testvidinfo.c \ test/testwin.c \ test/testwm.c \ test/threadwin.c \ test/torturethread.c \ $(TARGET): copy_config \ $(OBJS) $(AR) rcs $(TARGET) $(OBJS) copy_config: @cp include/SDL_config.h.default include/SDL_config.h clean: rm -f include/SDL_config.h $(OBJS)