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

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#include <fenv.h>
#include "cpu_features.h"
/* 7.6.4.4
The feupdateenv function saves the currently raised exceptions in
its automatic storage, installs the floating-point environment
represented by the object pointed to by envp, and then raises the
saved exceptions. The argument envp shall point to an object
set by a call to feholdexcept or fegetenv, or equal the macro
FE_DFL_ENV or an implementation-defined environment macro. */
int feupdateenv (const fenv_t * envp)
{
unsigned int _fexcept;
__asm__ ("fnstsw %%ax" : "=a" (_fexcept)); /*save excepts */
if (__HAS_SSE)
{
unsigned int _csr;
__asm__ ("stmxcsr %0" : "=m" (_csr));
_fexcept |= _csr;
}
fesetenv (envp); /* install the env */
feraiseexcept (_fexcept & FE_ALL_EXCEPT); /* raise the execeptions */
return 0;
}