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Many boolean expressions involve conjunction (and) or disjunction (or) oper- ations. This section describes how to convert boolean expressions into assembly language. There are two different ways to convert complex boolean expres- sions involving conjunction and disjunction into assembly language: using complete boolean evaluation or using short-circuit boolean evaluation. This section discusses complete boolean evaluation. The next section discusses short-circuit boolean evaluation. Conversion via complete boolean evaluation is almost identical to con- verting arithmetic expressions into assembly language. Indeed, the previous chapter on arithmetic covers this conversion process. About the only thing worth noting about that process is that you do not need to store the result in some variable; once the evaluation of the expression is complete, you check to see if you have a false (0) or true (1, or nonzero) result to take whatever action the boolean expression dictates. As you can see in the examples in the preceding sections, you can often use the fact that the last logical instruction (and/or) sets the zero flag if the result is false and clears the zero flag if the result is true. This lets you avoid explicitly testing for the result. Consider the following if statement and its conversion to assembly language using com- plete boolean evaluation:

Many boolean expressions involve conjunction (and) or disjunction (or) oper- ations. This section describes how to convert boolean expressions into assembly language. There are two different ways to convert complex boolean expres- sions involving conjunction and disjunction into assembly language: using complete boolean evaluation or using short-circuit boolean evaluation. This section discusses complete boolean evaluation. The next section discusses short-circuit boolean evaluation. Conversion via complete boolean evaluation is almost identical to con- verting arithmetic expressions into assembly language. Indeed, the previous chapter on arithmetic covers this conversion process. About the only thing worth noting about that process is that you do not need to store the result in some variable; once the evaluation of the expression is complete, you check to see if you have a false (0) or true (1, or nonzero) result to take whatever action the boolean expression dictates. As you can see in the examples in the preceding sections, you can often use the fact that the last logical instruction (and/or) sets the zero flag if the result is false and clears the zero flag if the result is true. This lets you avoid explicitly testing for the result. Consider the following if statement and its conversion to assembly language using com- plete boolean evaluation:

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Many boolean expressions involve conjunction (and) or disjunction (or) oper- ations. This section describes how to convert boolean expressions into assembly language. There are two different ways to convert complex boolean expres- sions involving conjunction and disjunction into assembly language: using complete boolean evaluation or using short-circuit boolean evaluation. This section discusses complete boolean evaluation. The next section discusses short-circuit boolean evaluation. Conversion via complete boolean evaluation is almost identical to con- verting arithmetic expressions into assembly language. Indeed, the previous chapter on arithmetic covers this conversion process. About the only thing worth noting about that process is that you do not need to store the result in some variable; once the evaluation of the expression is complete, you check to see if you have a false (0) or true (1, or nonzero) result to take whatever action the boolean expression dictates. As you can see in the examples in the preceding sections, you can often use the fact that the last logical instruction (and/or) sets the zero flag if the result is false and clears the zero flag if the result is true. This lets you avoid explicitly testing for the result. Consider the following if statement and its conversion to assembly language using com- plete boolean evaluation:
Transcribed Image Text:Many boolean expressions involve conjunction (and) or disjunction (or) oper- ations. This section describes how to convert boolean expressions into assembly language. There are two different ways to convert complex boolean expres- sions involving conjunction and disjunction into assembly language: using complete boolean evaluation or using short-circuit boolean evaluation. This section discusses complete boolean evaluation. The next section discusses short-circuit boolean evaluation. Conversion via complete boolean evaluation is almost identical to con- verting arithmetic expressions into assembly language. Indeed, the previous chapter on arithmetic covers this conversion process. About the only thing worth noting about that process is that you do not need to store the result in some variable; once the evaluation of the expression is complete, you check to see if you have a false (0) or true (1, or nonzero) result to take whatever action the boolean expression dictates. As you can see in the examples in the preceding sections, you can often use the fact that the last logical instruction (and/or) sets the zero flag if the result is false and clears the zero flag if the result is true. This lets you avoid explicitly testing for the result. Consider the following if statement and its conversion to assembly language using com- plete boolean evaluation:
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