Yet further adjust degree-based trig functions for more portability.
Buildfarm member cockatiel is still saying that cosd(60) isn't 0.5. What seems likely is that the subexpression (1.0 - cos(x)) isn't being rounded to double width before more arithmetic is done on it, so force that by storing it into a variable.
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@ -2000,7 +2000,9 @@ sind_0_to_30(double x)
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static double
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cosd_0_to_60(double x)
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{
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return 1.0 - ((1.0 - cos(x * RADIANS_PER_DEGREE)) / one_minus_cos_60) / 2.0;
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float8 one_minus_cos_x = 1.0 - cos(x * RADIANS_PER_DEGREE);
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return 1.0 - (one_minus_cos_x / one_minus_cos_60) / 2.0;
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}
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