https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114126
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Why do you think this is a bug?
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
int
main ()
{
_Float128 f = tanf128 (M_PI_2f128);
volatile _Float128 g = M_PI_2f128;
g = tanf128 (g);
char buf[128];
strfromf128 (buf, 128, "%.34a", f);
printf ("%s\n", buf);
strfromf128 (buf, 128, "%.34a", g);
printf ("%s\n", buf);
}
also prints
0x1.1c46bd57277993a2ee60193c957b000000p+114
0x1.1c46bd57277993a2ee60193c957b000000p+114
M_PI_2q or M_PI_2f128 is
1.5707963267948966192313216916397513987...
while pi/2 with larger precision is I think
1.5707963267948966192313216916397514420...
so M_PI_2{q,f128} is rounded down, not up,
so no wonder tanq/tanf128 is not inf.
