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Logical comparisons with proper condition code settings can be simulated, using "arithmetic compare" and "arithmetic compare with carry" operations.
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Simulating Logical Comparisons Using Arithmetic With Carry Operations
Logical comparisons with proper condition code settings can be simulated,
using "arithmetic compare" and "arithmetic compare with carry" operations.
The results of such comparisons are stored by setting one of
three condition codes:
'LOW' 'EQUAL' 'HIGH'.
Arithmetic comparisons are based on arithmetic values, whereas logical
(character) comparisons are based on the bit patterns of two operands.
In some coding situations it is desirable to have a logical comparsion yielding
the same condition setting (i.e., 'LOW'/'EQUAL'/'HIGH') as an arithmetic
comparison. This is essential if subsequent code sequences use such condition
codes irrespective of the type of comparison previously executed.
An arithmetic comparison for twos complement arithmetic, however, cannot
be directly used for a logical comparison. This means that if in twos complement
notation the first bit of the word is '1', it is interpreted as a negative number and
thus is considered to be smaller than words having a '0' as a first bit ('1...' arith c
'0...'). For logical values, however, the comparison must be based on the
unsigned integer value of the word ('1...' log ? '0...").
The following code generates the desired condition code setting
for logical comparisons using arithmetic comparisons:
compare operand 1, operand 2 (arithmetic comparison)
compare with carry Z, Z (arithmetic comparison,
Z = any operand).