Hey,
while testing ECL on Cygwin I've encountered a few issues with how the
functions coshl and acoshl treat infinities (long double
functions). Results are invalid and that does not happen on Linux.
Please consider the following code:
-- cut --
#include <math.h>
#include <stdio.h>
#include <complex.h>
int main () {
long double num1 = -INFINITY;
double num2 = -INFINITY;
printf("negative infinities\n");
printf("long double: %Lf, double: %f\n", num1, num2);
num1 = coshl(num1);
num2 = cosh (num2);
printf("map cosh (should flip infinities to positive)\n");
printf("long double: %Lf, double: %f\n", num1, num2);
num1 = INFINITY;
num2 = INFINITY;
printf("positive infinities\n");
printf("long double: %Lf, double: %f\n", num1, num2);
num1 = acoshl(num1);
num2 = acosh (num2);
printf("map acosh (should remain positive infinities)\n");
printf("long double: %Lf, double: %f\n", num1, num2);
return 0;
}
-- cut --
coshl returns negative infinity (incorrectly) and acoshl returns a nan.
Moreover cacoshf and cacosh for infinities return nan, and a surprise,
long double variant works fine. I didn't test for other values than
infinities.
GCC 7.4.0
Cygwin installed from Setup version 2.897 (64 bit)
Platform: Windows 7 Professional (x86-64)
Best regards,
Daniel
--
Daniel Kochmański ;; aka jackdaniel | Przemyśl, Poland
TurtleWare - Daniel Kochmański | www.turtleware.eu
"Be the change that you wish to see in the world." - Mahatma Gandhi
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