What is the use of TRT instruction and how it is working?
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Answer Posted / phils
TRT is used to scan a string of characters byte by byte,
using the hexadecimal value of each character to 'index'
into a 256 byte translate table, If the resultant table byte
is set to X'00', then processing continues with the next
input character, and so on until end of input string, or a
non-zero table byte is encountered.
TRT sets the condition code to indicate the results
of the scanning operation as follows:
Condition Code Indications
0 ( Zero ) All table bytes X’00’.
1 ( Minus ) nonzero tabl found before the end
of operand 1
2 ( Positive ) A nonzero table byte was found at
the end of the operand 1
The condition code can be tested using BZ, BNZ, BM, BNM,
BP, or BNP.
In this way we can test that a string contains only
'desirable values' by setting the equivalent bytes in the
translate table to X'00' e.g. testing for numerics as in
answer 4.
| Is This Answer Correct ? | 3 Yes | 2 No |
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