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Assume that the sequence of assembly code below has just been executed, and a SET instruction is executed immediately afterwards. What would be stored in the %al register after each of the SET instructions shown? Give your answer as either 0 or 1. Assembly code: movb $0XFF, sd1 cmpb sox88, sdl Set instructions: setge tal * AL - setb tal # AL = sete tal # AL = setns šal * AL =

Assume that the sequence of assembly code below has just been executed, and a SET instruction is executed immediately afterwards. What would be stored in the %al register after each of the SET instructions shown? Give your answer as either 0 or 1. Assembly code: movb $0XFF, sd1 cmpb sox88, sdl Set instructions: setge tal * AL - setb tal # AL = sete tal # AL = setns šal * AL =

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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**Assembly Code and SET Instructions Analysis** Assume that the sequence of assembly code below has just been executed, and a SET instruction is executed immediately afterwards. What would be stored in the `%al` register after each of the SET instructions shown? Give your answer as either 0 or 1. **Assembly code:** ``` movb $0xFF, %dl cmpb $0x89, %dl ``` **Set instructions:** - `setge %al` # AL = - `setb %al` # AL = - `sete %al` # AL = - `setns %al` # AL = --- ### Explanation: #### Assembly Code Breakdown: 1. `movb $0xFF, %dl`: This instruction moves the hexadecimal value `0xFF` (which is 255 in decimal) into the `%dl` register. 2. `cmpb $0x89, %dl`: This instruction compares the value `0x89` (which is 137 in decimal) with the value in `%dl` (255). It sets the status flags based on the comparison result. #### SET Instructions: - `setge %al`: Sets `%al` to 1 if the result of the comparison is greater than or equal to zero (i.e., `ZF=1` or `SF=OF`). - `setb %al`: Sets `%al` to 1 if the result of the comparison is below (i.e., not above or equal; `CF=1`). - `sete %al`: Sets `%al` to 1 if the result of the comparison is equal (i.e., `ZF=1`). - `setns %al`: Sets `%al` to 1 if the sign flag is not set (i.e., `SF=0`). Since `0xFF` (255) is greater than `0x89` (137), you can determine the outcomes based on the status flags influenced by the comparison.
Transcribed Image Text:**Assembly Code and SET Instructions Analysis** Assume that the sequence of assembly code below has just been executed, and a SET instruction is executed immediately afterwards. What would be stored in the `%al` register after each of the SET instructions shown? Give your answer as either 0 or 1. **Assembly code:** ``` movb $0xFF, %dl cmpb $0x89, %dl ``` **Set instructions:** - `setge %al` # AL = - `setb %al` # AL = - `sete %al` # AL = - `setns %al` # AL = --- ### Explanation: #### Assembly Code Breakdown: 1. `movb $0xFF, %dl`: This instruction moves the hexadecimal value `0xFF` (which is 255 in decimal) into the `%dl` register. 2. `cmpb $0x89, %dl`: This instruction compares the value `0x89` (which is 137 in decimal) with the value in `%dl` (255). It sets the status flags based on the comparison result. #### SET Instructions: - `setge %al`: Sets `%al` to 1 if the result of the comparison is greater than or equal to zero (i.e., `ZF=1` or `SF=OF`). - `setb %al`: Sets `%al` to 1 if the result of the comparison is below (i.e., not above or equal; `CF=1`). - `sete %al`: Sets `%al` to 1 if the result of the comparison is equal (i.e., `ZF=1`). - `setns %al`: Sets `%al` to 1 if the sign flag is not set (i.e., `SF=0`). Since `0xFF` (255) is greater than `0x89` (137), you can determine the outcomes based on the status flags influenced by the comparison.
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