Compile-time trigonometry in C
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lhahne
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Published on 2011-01-08T10:41:04Z
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2011/01/08
10:53 UTC
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c
|optimization
I currently have code that looks like
while (very_long_loop) {
...
y1 = getSomeValue();
...
x1 = y1*cos(PI/2);
x2 = y2*cos(SOME_CONSTANT);
...
outputValues(x1, x2, ...);
}
the obvious optimization would be to compute the cosines ahead-of-time. I could do this by filling an array with the values but I was wondering would it be possible to make the compiler compute these at compile-time?
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