Compare Instruction - 8087 Math Coprocessor - Microprocessor | Summary and Q&A

TL;DR

An overview of the compare instructions in the 8087 math coprocessor instruction set, which compare the values of two numbers.

Key Insights

• 💦 The 8087 math coprocessor is designed to work with the 8086 and 8088 microprocessor family.
• 😫 The instruction set of the 8087 math coprocessor is categorized into six different categories based on the operation or function performed.
• ℹ️ Compare instructions in the 8087 math coprocessor compare the contents of the stack element with contents from specified or default sources.
• 😫 Compare instructions set condition code bits in the status word to indicate the result of the comparison.

Transcript

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Questions & Answers

Q: What is the purpose of compare instructions in the 8087 math coprocessor?

Compare instructions in the 8087 math coprocessor are used to compare the values of two numbers and determine if one is greater than, less than, or equal to the other.

Q: How are the compare instructions executed in the 8087 math coprocessor?

The compare instructions compare the contents of the stack element (ST) with the contents of specified or default sources, such as other stack elements or memory locations.

Q: How are the results of the comparison displayed in the 8087 math coprocessor?

The compare instructions set the condition code bits (C3, C2, C0) of the status word in the 8087 math coprocessor. Depending on the values of these bits, the result of the comparison (greater than, less than, equal, or not comparable) is determined.

Q: What are the different compare instructions available in the 8087 math coprocessor?

The compare instructions in the 8087 math coprocessor include FCOM, FCOMP, FCOMPP, FICOM, FICOMP, FUCOM, FUCOMP, and FXAM.

Summary & Key Takeaways

• The 8087 math coprocessor was developed by Intel to pair with the 8086 and 8088 microprocessor family.

• The instruction set of the 8087 is classified into six categories, including compare instructions, which compare the values of two numbers.

• Compare instructions in the 8087 set compare the contents of the stack element with contents from specified or default sources.