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this type of arithmetic is sensitive to the FPU setting, remember that in the original code there were two functions to set the FPU flags, I bet that's where the problem is, or if you can coerce the compiler to use sse2 instructions then you should be ok.

(dd_to_digits): can't compute exponent.

dd_x.x[0] dd_x[1]cos(1/11) 0.9958706137005629 0.9958706137005629

cos(1/11) 0.9958706137005629 -4.772639498746044e-017