pTAL Reference Manual (H06.08+)

Compiler Directives

HP pTAL Reference Manual—523746-006

17-23

CHECKSHIFTCOUNT

generates code that causes an overflow trap if the number of positions in a bit-shift

operation is too large, as in:

INT j := 20;

INT i;

i := i << j;

(For more information about bit shifts, see Bit Shifts on page 5-33.)

NOCHECKSHIFTCOUNT

suppresses the generation of code that causes an overflow trap if the number of

positions in a bit-shift operation is too large.

PUSHCHECKSHIFTCOUNT

pushes the current setting (CHECKSHIFTCOUNT or NOCHECKSHIFTCOUNT)

onto the CHECKSHIFTCOUNT directive stack. Does not change the current

setting.

POPCHECKSHIFTCOUNT

pops the top value from the CHECKSHIFTCOUNT directive stack and changes the

current setting to that value.

For an explanation of directive stacks, see Directive Stacks on page 17-4.

Caution. If such a bit-shift operation occurs, subsequent program behavior is undefined.

Default: NOCHECKSHIFTCOUNT

Placement: Anywhere

Scope:

•

CHECKSHIFTCOUNT applies to the shift operators that follow it

until it is overridden by NOCHECKSHIFTCOUNT

•

NOCHECKSHIFTCOUNT applies to the shift operators that follow it

until it is overridden by CHECKSHIFTCOUNT

Dependencies: None

CHECKSHIFTCOUNT

NOCHECKSHIFTCOUNT

PUSHCHECKSHIFTCOUNT

POPCHECKSHIFTCOUNT

VST659.vsd