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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* w_powf.c -- float version of w_pow.c. |
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| 3 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 4 | */ |
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| 5 | |||
| 6 | /* |
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| 7 | * ==================================================== |
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| 8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 9 | * |
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| 10 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 11 | * Permission to use, copy, modify, and distribute this |
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| 12 | * software is freely granted, provided that this notice |
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| 13 | * is preserved. |
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| 14 | * ==================================================== |
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| 15 | */ |
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| 16 | |||
| 17 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 18 | static char rcsid[] = "$Id: w_powf.c,v 1.1 1994/08/10 20:35:29 jtc Exp $"; |
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| 19 | #endif |
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| 20 | |||
| 21 | /* |
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| 22 | * wrapper powf(x,y) return x**y |
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| 23 | */ |
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| 24 | |||
| 25 | #include "math.h" |
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| 26 | #include "math_private.h" |
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| 27 | |||
| 28 | |||
| 29 | #ifdef __STDC__ |
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| 30 | float powf(float x, float y) /* wrapper powf */ |
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| 31 | #else |
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| 32 | float powf(x,y) /* wrapper powf */ |
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| 33 | float x,y; |
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| 34 | #endif |
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| 35 | { |
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| 36 | #ifdef _IEEE_LIBM |
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| 37 | return __ieee754_powf(x,y); |
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| 38 | #else |
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| 39 | float z; |
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| 40 | z=__ieee754_powf(x,y); |
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| 41 | if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z; |
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| 42 | if(isnanf(x)) { |
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| 43 | if(y==(float)0.0) |
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| 44 | /* powf(NaN,0.0) */ |
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| 45 | return (float)__kernel_standard((double)x,(double)y,142); |
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| 46 | else |
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| 47 | return z; |
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| 48 | } |
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| 49 | if(x==(float)0.0){ |
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| 50 | if(y==(float)0.0) |
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| 51 | /* powf(0.0,0.0) */ |
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| 52 | return (float)__kernel_standard((double)x,(double)y,120); |
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| 53 | if(finitef(y)&&y<(float)0.0) |
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| 54 | /* powf(0.0,negative) */ |
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| 55 | return (float)__kernel_standard((double)x,(double)y,123); |
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| 56 | return z; |
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| 57 | } |
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| 58 | if(!finitef(z)) { |
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| 59 | if(finitef(x)&&finitef(y)) { |
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| 60 | if(isnanf(z)) |
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| 61 | /* powf neg**non-int */ |
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| 62 | return (float)__kernel_standard((double)x,(double)y,124); |
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| 63 | else |
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| 64 | /* powf overflow */ |
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| 65 | return (float)__kernel_standard((double)x,(double)y,121); |
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| 66 | } |
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| 67 | } |
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| 68 | if(z==(float)0.0&&finitef(x)&&finitef(y)) |
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| 69 | /* powf underflow */ |
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| 70 | return (float)__kernel_standard((double)x,(double)y,122); |
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| 71 | return z; |
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| 72 | #endif |
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| 73 | } |