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[cln.git] / src / float / transcendental / cl_F_roundpi2.cc
1 // cl_round_pi2().
2
3 // General includes.
4 #include "cl_sysdep.h"
5
6 // Specification.
7 #include "cl_F_tran.h"
8
9
10 // Implementation.
11
12 namespace cln {
13
14 const cl_F_div_t cl_round_pi2 (const cl_F& x)
15 {
16         if (float_exponent(x) < 0)
17                 // Exponent <0 -> |x|<1/2 -> |x/(pi/2)| < 1/2, also Division unnötig
18                 return cl_F_div_t(0,x); // Quotient 0, Rest x
19         else
20                 // x durch pi/2 (mit hinreichender Genauigkeit) dividieren
21                 return round2(x,scale_float(pi(x),-1));
22 }
23
24 }  // namespace cln