libquadmath/math/isinfq.c

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Change for long double by Jakub Jelinek <jj@ultra.linux.cz>
   4  * Public domain.
   5  */
   6
   7 #include "quadmath-imp.h"
   8
   9 int
  10 isinfq (__float128 x)
  11 {
  12   int64_t hx,lx;
  13   GET_FLT128_WORDS64(hx,lx,x);
  14   lx |= (hx & 0x7fffffffffffffffLL) ^ 0x7fff000000000000LL;
  15   lx |= -lx;
  16   return ~(lx >> 63) & (hx >> 62);
  17 }