What does AAD mean in ASSEMBLY
AAD stands for ASCII Adjust for Division. This abbreviation is used in the context of computing to refer to a two-byte code used as an instruction in Intel x86 CPUs. It is used to adjust numbers during the execution of the DIV instruction, which divides one number by another. AAD can be found in some assembler programming languages, such as MASM, NASM, and FASM.
AAD meaning in Assembly in Computing
AAD mostly used in an acronym Assembly in Category Computing that means ASCII Adjust for Division
Shorthand: AAD,
Full Form: ASCII Adjust for Division
For more information of "ASCII Adjust for Division", see the section below.
Explanation
The AAD command was introduced in Intel's 8086 CPU family and can be used to divide 8-bit or 16-bit binary numbers. The AAD instruction adjusts the upper byte of a two-byte number so that it is easier to handle when doing division operations. When executing this instruction, the upper byte (most significant byte) of the two-byte value is treated as if it were an unsigned 8-bit value and then adjusted accordingly.
For example, take the hexadecimal number 0xFFF1 (which would represent 65521 in decimal). Without using AAD, when executing a DIV operation on this number and dividing it by 4 (in decimal), the result would be 16380x4 = 65520 instead of the expected result of 65521/4 = 16380.5 (rounded down to 16380). Applying an AAD instruction will correct this problem by adjusting the most significant byte from FFFh to 00Fh so that when divided by four, it will produce 00Fh ÷ 04h = 03th = 3 as expected.
Essential Questions and Answers on ASCII Adjust for Division in "COMPUTING»ASSEMBLY"
What is ASCII Adjust for Division (AAD)?
ASCII Adjust for Division (AAD) is an instruction in the x86 assembly language. It is used to adjust the result of a signed division by adding or subtracting 2^n, where n is the number of bits in the division. It is mainly used when dividing long numbers which might not yield an exact result.
How does AAD affect a divide operation?
AAD affects a divide operation by automatically adjusting the result of a signed division to have exact values. It adds or subtracts 2^n from the result of a divide operation, where n is equal to the number of bits used for performing the division. This helps in ensuring that all divisions have precise results and no data loss occurs during these operations.
What kind of errors can AAD help prevent?
AAD can help prevent truncation errors, which occur when data losses occur during division operations due to inexact results. By adding or subtracting 2^n to account for discrepancies, AAD minimizes this problem so that results are precise and accurate.
Does AAD support any other instruction besides divide?
No, AAD only supports operations related to dividing signed numbers with large bit values. Other instructions like multiplication, addition, and subtraction do not utilize AAD as they do not require such adjustments.
Can AAD be used on floating-point numbers?
No, AAD cannot be used on floating-point numbers as it only works with integer arithmetic operations like signed divides. Floating-point numbers require additional instructions and algorithms that are out of scope for what AAD offers.
How many different types of adjustments does AAD offer?
There are two main types of adjustments offered by AAD – addition and subtraction adjustments – which can be used depending on the size of the divided numbers and how exact one wants their results to be. These adjustments help in getting precise results from certain divide operations.
Is there any limit on how big a number an AAD instruction can handle?
No, there is no limit set on how big a number an instruction can handle as long as it's within even or odd byte boundary limits set by your processor type in your machine code definition book.
Final Words:
In conclusion, AAD stands for ASCII Adjust For Division and is a two-byte code used as an instruction in Intel x86 CPUs in order to adjust numbers during division operations. This adjustment makes sure that the results are accurate when dealing with 8 and 16 bit numbers so that further calculations can be done without any errors or inconsistencies occurring during computation.
AAD also stands for: |
|
| All stands for AAD |