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  1. #include <fenv.h>
  2.  
  3. /* 7.6.2.5
  4.     The fetestexcept function determines which of a specified subset of
  5.     the exception flags are currently set. The excepts argument
  6.     specifies the exception flags to be queried.
  7.     The fetestexcept function returns the value of the bitwise OR of the
  8.     exception macros corresponding to the currently set exceptions
  9.     included in excepts.
  10. */
  11.  
  12. int fetestexcept (int excepts)
  13. {
  14.     unsigned short _sw;
  15.     __asm__ ("fnstsw %%ax" : "=a" (_sw));
  16.     return _sw & excepts & FE_ALL_EXCEPT;
  17. }
  18.