Arguments

 

clrmsk

   OpenVMS usage:mask_quadword
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by reference
   Address of a quadword bit mask to be cleared in the IEEE
   floating-point control register.

   The $IEEEDEF macro defines symbols for the floating-point
   control register. The following table shows the symbols, their
   corresponding masks, and their meaning:

   Table SYS-21 Format of the IEEE Floating-Point Control Register
                (Alpha and Integrity servers)

   Symbol                 Mask    Meaning

   IEEE$M_TRAP_ENABLE_    2       Enable invalid operation exception
   INV
   IEEE$M_TRAP_ENABLE_    4       Enable divide by 0 exception
   DZE
   IEEE$M_TRAP_ENABLE_    8       Enable overflow exception
   OVF
   IEEE$M_TRAP_ENABLE_    10      Enable underflow exception
   UNF
   IEEE$M_TRAP_ENABLE_    20      Enable inexact exception
   INE
   IEEE$M_TRAP_ENABLE_    40      Enable denormal operand exception
   DNOE
   IEEE$M_MAP_DNZ         2000    Denormal operands are mapped to
                                  0.0
   IEEE$M_MAP_UMZ         4000    Underflow results are mapped to
                                  0.0
   IEEE$M_INHERIT         8000    Inherit FP state on thread create
   IEEE$M_STATUS_INV      20000   Invalid operation
   IEEE$M_STATUS_DZE      40000   Divide by 0
   IEEE$M_STATUS_OVF      80000   Overflow
   IEEE$M_STATUS_UNF      100000  Underflow
   IEEE$M_STATUS_INE      200000  Inexact
   IEEE$M_STATUS_DNO      400000  Denormal operand
 

setmsk

   OpenVMS usage:mask_quadword
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by reference
   Address of a quadword bit mask to be set in the IEEE floating-
   point control register.

   See the clrmsk argument for the format of the IEEE floating-point
   control register.
 

prvmsk

   OpenVMS usage:mask_quadword
   type:         quadword (unsigned)
   access:       write only
   mechanism:    by reference
   Address of a quadword to receive the previous value of the IEEE
   floating-point control register.