![sorting numbers in emu8086 sorting numbers in emu8086](https://image.slidesharecdn.com/shanawar-160907015739/95/bubble-sorting-of-an-array-in-8086-assembly-language-14-638.jpg)
JNL (jump not less) is the same as JGE (jump greater or equal), and JNLE (jump not less or equal) equal to JG (jump greater). Your use of negative conditions in conditional jump instructions is (for me) harder to read than the equivalent positive ones. It is also a common optimization in some compiled languages (specifically C and C++). This duplicates the condition check, but avoids an extra jump when the loop terminates.
#Sorting numbers in emu8086 code
(The same applies to _quickSort, but if you're going to use this code in a later project, or call it from another language, you might want to keep the passing of parameters on the stack.)Īt the end of your while loop (between the endIf1 and endL2 labels), rather than unconditionally jumping to the top of the loop and checking the condition, check the condition and conditionally jump back to the top of the loop. Since _partition is only used locally, it could be given a non-mangled name and parameters passed directly in the registers, rather than using the stack.
#Sorting numbers in emu8086 full
This will make the second call work on the wrong bounds, resulting in either a longer execution (by sorting a larger area than necessary) or incorrect results (if the full area isn't sorted). Now we invoke interrupt service routine by using INT 21H Converting decimal strings to integers Related Examples. Which leads to my next point: when you make your recursive _quickSort calls, you assume that the value in EAX will not change during the first call, but it can since you're not saving and restoring the value during the call. So just use ECX as the count, and EAX to cycle temporary values thru. You're using EAX as a count, but you start it off by copying the value from ECX. In your "swap" code, this would normally use EAX instead of ECX. EAX is typically used as a temporary register or accumulator (so much so that some operations on it have shorter encodings than if those same operations are done with other registers). Your use of some of the registers is a bit atypical. This is just a review of the code I have not verified that the assembly code correctly implements the algorithm in the pseudocode.
![sorting numbers in emu8086 sorting numbers in emu8086](https://i.pinimg.com/originals/fe/37/2a/fe372a428e0cc0e9700688b4b9b188f3.png)
I took the advice given to me on my last post and loaded all function parameters into registers instead of reading and writing to memory over and over. This was the pseudocode I used: Partition(A, p, r) r ebp + 16 integer index to end of set up stack, save regs Entry: A ebp + 8 pointer to array to being sorted Mov eax, ecx j (loop count) initialized to p Load function parameters into registers and initialize local variables Exit: the index of the pivot stored in set up stack, save regs The last thing is assigning value in array or initial value of array. It depends on you that which type of data you want to store in your array. Here, ’MyArray’ is the name of the array and DB (Data Byte), DW (Data Word) are it’s type. r ebp + 16 integer index to end of sub-array The very common method to declare an array in emu 8086 is. p ebp + 12 integer index to start of sub-array Entry: A ebp + 8 pointer to array being sorted An array of 25 random integers to be sorted This program implements the Quick Sort algorithm and sorts an array
![sorting numbers in emu8086 sorting numbers in emu8086](https://cdn.shopify.com/s/files/1/0281/7132/products/Binder16_Page_5_2048x.png)
My task was to implement Quick Sort in assembly from pseudocode.