EMS Manual

Compiled Filters

EMS Manual—426909-005

5-19

Bit-Extraction Operator

To extract bits from a specified operand creating an unsigned integer value:

operand

is any token value, field, or constant that occupies a byte, word, double word, or

quad word.

bit-1

is an integer in the range 0 through 63 that does not exceed the range implied by

the data type: (0:7) for bytes, (0:15) for words, and so forth.

bit-2

is an integer in the range 0 through 63, inclusive, and must be greater than or

equal to bit-1.

Considerations

The range for the byte data type (0:7) differs from TAL conventions.

Example

This example demonstrates a bit-extraction operator extracting bits from a token value:

IF XYZ^TKN^INTWORD.<12:15> = 15 THEN PASS 1;

This example compares the four low-order bits of the full-word integer value with 15

and checks whether the four bits are all on.

Comparisons

The syntax for comparisons:

operand . < bit-1 : bit-2 >

operand operand