pTAL Conversion Guide

Hardware Indicators

pTAL Conversion Guide—527302-002

20-15

Setting Hardware Indicators in TAL

When the condition code is accessible following an assignment statement, the numeric

value of the evaluated expression on the right side of the assignment statement

determines the value of the condition code.

The condition code is accessible after an assignment statement in pTAL only if all of

the following conditions are satisfied (however, see the exceptions that follow):

•

The right side of the assignment statement cannot:

Consist solely of a one-byte item

STRING s;

INT i;

i := s; ! Condition code is not available

Consist solely of a call to a pTAL built-in routine

i := $ABS(i); ! Condition code is not available

Be an expression that evaluates to one of the address types (WADDR,

EXTADDR, and so forth)

INT i;

INT .p;

@p := @i; ! Right side is a WADDR value,

! condition code not available

Be an expression that evaluates to a floating-point data type [REAL or

REAL(64)]

REAL r := 1.0E0;

r := r + 1.0E0; ! Right side is a floating point number,

! condition code not available

Be a constant or constant expression

INT a;

a := 2 << 3;

The following considerations, however, override the preceding conditions:

If the last operation on the right side of an assignment statement is a function

call, the following rules apply:

If the function specifies the RETURNSCC attribute, you can test the

condition code following the assignment statement, independent of the

data type of the value returned by the function.