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April 23, 2012
sincos()
If you are computing both the sine and cosine of an angle, then you will be twice as quick if you call sincos() than if you call cos() and sin() independently:
#include
int main()
{
double a,b,c;
a=1.0;
for (int i=0;i<100000000;i++) { b=sin(a); c=cos(a); }
}
$ cc -O sc.c -lm
$ timex ./a.out
real 19.13
vs
#include
int main()
{
double a,b,c;
a=1.0;
for (int i=0;i<100000000;i++) { sincos(a,&b,&c); }
}
$ cc -O sc.c -lm
$ timex ./a.out
real 9.80
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