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glibc  2.9
feenablxcpt.c File Reference
#include <fenv.h>

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int feenableexcept (int excepts)

Function Documentation

int feenableexcept ( int  excepts)

Definition at line 24 of file feenablxcpt.c.

  union { unsigned long long l; unsigned int sw[2]; } s;
  unsigned int old_exc;

  /* Get the current status word. */
  __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0");

  old_exc = s.sw[0] & FE_ALL_EXCEPT;

  s.sw[0] |= (excepts & FE_ALL_EXCEPT);
  __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0");

  return old_exc;

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