mirror of https://github.com/PrimeDecomp/prime.git
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/* @(#)w_pow.c 1.2 95/01/04 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* wrapper pow(x,y) return x**y
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*/
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#include "fdlibm.h"
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#ifdef __STDC__
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double pow(double x, double y) /* wrapper pow */
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#else
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double pow(x, y) /* wrapper pow */
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double x, y;
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_pow(x, y);
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#else
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double z;
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z = __ieee754_pow(x, y);
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if (_LIB_VERSION == _IEEE_ || isnan(y))
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return z;
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if (isnan(x)) {
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if (y == 0.0)
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return __kernel_standard(x, y, 42); /* pow(NaN,0.0) */
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else
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return z;
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}
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if (x == 0.0) {
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if (y == 0.0)
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return __kernel_standard(x, y, 20); /* pow(0.0,0.0) */
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if (isfinite(y) && y < 0.0)
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return __kernel_standard(x, y, 23); /* pow(0.0,negative) */
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return z;
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}
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if (!isfinite(z)) {
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if (isfinite(x) && isfinite(y)) {
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if (isnan(z))
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return __kernel_standard(x, y, 24); /* pow neg**non-int */
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else
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return __kernel_standard(x, y, 21); /* pow overflow */
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}
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}
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if (z == 0.0 && isfinite(x) && isfinite(y))
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return __kernel_standard(x, y, 22); /* pow underflow */
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return z;
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#endif
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}
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