newlib-cygwin/winsup/mingw/mingwex/feholdexcept.c

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#include <fenv.h>
/* 7.6.4.2
The feholdexcept function saves the current floating-point
environment in the object pointed to by envp, clears the exception
flags, and then installs a non-stop (continue on exceptions) mode,
if available, for all exceptions. */
int feholdexcept (fenv_t * envp)
{
fenv_t tmp_env;
__asm__ ("fnstenv %0;" : "=m" (* envp)); /* save current into envp */
tmp_env = * envp;
tmp_env.__status_word &= ~FE_ALL_EXCEPT; /* clear exception flags */
tmp_env.__control_word |= FE_ALL_EXCEPT; /* set cw to non-stop */
__asm__ volatile ("fldenv %0;" : : "m" (tmp_env)); /* install the copy */
return 0;
}