pTAL Reference Manual (H06.08+)

Built-In Routines

HP pTAL Reference Manual—523746-006

15-7

$ATOMIC_DEP

$ATOMIC_DEP atomically deposits bits into an INT variable.

var input,output

INT:variable

is the variable into which $ATOMIC_DEP deposits bits from value.

mask input

INT:value

is a 16-bit mask word that determines which bits of value to deposit into var.

$ATOMIC_DEP stores into each bit position of var. The corresponding bit in

value after performing an “and” operation between the corresponding bits in

value and mask.

value input

INT:value

holds the bits that, after being masked, $ATOMIC_DEP deposits in var.

$ATOMIC_DEP performs the following operation:

var := (var LAND $COMP(mask)) LOR (value LAND mask)

All the operations are performed without interruption, as if they were one.

Sets condition code Yes (according the final value of var )

Sets $CARRY No

Sets $OVERFLOW No

Example 15-5. $ATOMIC_DEP Routine

INT var;

INT mask;

INT value;

$ATOMIC_DEP(var, mask, value);

) ;

VST609.vsd

($ATOMIC_DEP ,

var

mask

value