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33 lines
700 B
C
33 lines
700 B
C
/*
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* wrapper exp2f(x)
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*/
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#include <float.h>
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#include <math.h>
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#include "math_private.h"
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static const float o_threshold= (float) FLT_MAX_EXP;
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static const float u_threshold= (float) (FLT_MIN_EXP - FLT_MANT_DIG - 1);
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float
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__exp2f (float x) /* wrapper exp2f */
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{
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#ifdef _IEEE_LIBM
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return __ieee754_exp2f (x);
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#else
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float z;
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z = __ieee754_exp2f (x);
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if (_LIB_VERSION != _IEEE_ && __finitef (x))
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{
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if (x > o_threshold)
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/* exp2 overflow */
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return (float) __kernel_standard ((double) x, (double) x, 144);
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else if (x <= u_threshold)
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/* exp2 underflow */
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return (float) __kernel_standard ((double) x, (double) x, 145);
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}
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return z;
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#endif
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}
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weak_alias (__exp2f, exp2f)
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