Simple workaround to use fast computation is to use functions from spec.
header similar to following:
#ifndef FAST_MATH_H
#define FAST_MATH_H
#include <cmath>
inline double fast_sin(long double x) {
return sinl(x);
}
inline double fast_cos(long double x) {
return cosl(x);
}
inline double fast_tan(long double x) {
return tanl(x);
}
inline double fast_asin(long double x) {
return asinl(x);
}
inline double fast_acos(long double x) {
return acosl(x);
}
inline double fast_atan(long double x) {
return atanl(x);
}
inline double fast_atan2(long double x, long double y) {
return atan2l(x, y);
}
inline double fast_sinh(long double x) {
return sinhl(x);
}
inline double fast_cosh(long double x) {
return coshl(x);
}
inline double fast_asinh(long double x) {
return asinhl(x);
}
inline double fast_acosh(long double x) {
return acoshl(x);
}
inline double fast_pow(long double x, long double y) {
return powl(x, y);
}
inline double fast_sqrt(long double x) {
return sqrtl(x);
}
inline double fast_exp(long double x) {
return expl(x);
}
inline double fast_log(long double x) {
return logl(x);
}
inline double fast_log10(long double x) {
return log10l(x);
}
#endif /* FAST_MATH_H */
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https://bugs.launchpad.net/bugs/192134
Title:
slow math sin function for some values on amd64
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