Yuri wrote
How useful is the AND feature of the ALU to you programmers? I can't think of a useful situation for it so I want to remove it from the ALU for performance.
The AND feature is used to compute the logical functions that support logical expressions in high-level languages. For example if a and b are logical conditions, your program might want to test that a is true and b is false. The program would use "if (a & !b)" to test that condition.
AND and OR are also very useful for testing, setting and resetting bits within numeric values. For instance, "(a & 1)" will test if a number is odd.
Most programs do far more logical operations than arithmetic operations.
--Mark
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