Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

 ◄Detail►                                    ◄Up► ◄Contents► ◄Index► ◄Back►
────────────────────────────────────────────────────────────────────────────
 
  Title:    Load or Store Environment State
 
  Syntax:   FSTENV dest
            FNSTENV dest
            FLDENV mem
 
  See also: FSAVE, FSTCW, FSTSW, Coprocessor Environment
 
  Description:
 
     FSTENV stores the 14-byte coprocessor environment state to a
     specified memory location. FLDENV loads it from a specified memory
     location.
 
     The environment state includes the control word, status word, tag
     word, instruction pointer, and operand pointer. On the 80387/486
     in 32-bit mode, the environment state is 28 bytes.
 
     The FSTENV instruction has wait and no-wait versions. The wait
     version (FSTENV) checks for unmasked numeric errors; the no-wait
     version (FNSTENV) does not. When the .8087 directive is used, the
     assembler puts the WAIT instruction before the wait version and
     the NOP instruction before the no-wait version.
                                    -♦-