mirror of https://github.com/flysand7/ciabatta.git
43 lines
943 B
C
43 lines
943 B
C
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ftype suffix(exp)(ftype x) {
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if(isnan(x)) return NAN;
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if(x > 0 && isinf(x)) return +INFINITY;
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if(x < 0 && isinf(x)) return +0.0;
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if(x == 0) return 1.0;
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if(x > 709.8) {
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#if math_errhandling & MATH_ERREXCEPT
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feraiseexcept(FE_OVERFLOW);
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#endif
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#if math_errhandling & MATH_ERRNO
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errno = ERANGE;
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#endif
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return +INFINITY;
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}
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if(x < -708.4) {
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#if math_errhandling & MATH_ERREXCEPT
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feraiseexcept(FE_OVERFLOW);
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#endif
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#if math_errhandling & MATH_ERRNO
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errno = ERANGE;
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#endif
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return 0;
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}
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ftype e = 1.0;
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ftype xp = 1.0;
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ftype f = 1;
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for(uint64_t i = 1; i != 10; ++i) {
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f *= i;
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xp *= x;
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e += xp / f;
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}
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return e;
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}
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ftype suffix(exp2)(ftype x) {
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return suffix(exp)(x * ln2);
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}
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ftype suffix(expm1)(ftype x) {
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return suffix(exp)(x) - 1.0;
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}
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