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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 e6cd882e3ac0
children 3e3724fb829e
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2 These are test programs for the SDL library:
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4 checkkeys Watch the key events to check the keyboard
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5 graywin Display a gray gradient and center mouse on spacebar
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6 loopwave Audio test -- loop playing a WAV file
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7 testalpha Display an alpha faded icon -- paint with mouse
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8 testaudioinfo Lists audio device capabilities
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9 testbitmap Test displaying 1-bit bitmaps
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10 testblitspeed Tests performance of SDL's blitters and converters.
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11 testcdrom Sample audio CD control program
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12 testcursor Tests custom mouse cursor
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13 testdyngl Tests dynamically loading OpenGL library
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14 testerror Tests multi-threaded error handling
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15 testfile Tests RWops layer
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16 testgamma Tests video device gamma ramp
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17 testgl A very simple example of using OpenGL with SDL
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18 testgl2 Improved version of testgl
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19 testhread Hacked up test of multi-threading
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20 testiconv Tests international string conversion
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21 testjoystick List joysticks and watch joystick events
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22 testkeys List the available keyboard keys
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23 testloadso Tests the loadable library layer
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24 testlock Hacked up test of multi-threading and locking
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25 testmultiaudio Tests using several audio devices
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26 testoverlay Tests the software/hardware overlay functionality.
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27 testoverlay2 Tests the overlay flickering/scaling during playback.
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28 testpalette Tests palette color cycling
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29 testplatform Tests types, endianness and cpu capabilities
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30 testsem Tests SDL's semaphore implementation
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31 testsprite Example of fast sprite movement on the screen
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32 testsprite2 Improved version of testsprite
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33 testtimer Test the timer facilities
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34 testver Check the version and dynamic loading and endianness
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35 testvidinfo Show the pixel format of the display and perfom the benchmark
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36 testwin Display a BMP image at various depths
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37 testwm Test window manager -- title, icon, events
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38 testwm2 Improved version of testwm
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39 threadwin Test multi-threaded event handling
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40 torturethread Simple test for thread creation/destruction