Y86-64 program

1. [60] Write a Y86-64 program that sorts an array of longs.
• (10) Allocate a hardcoded input array similar to that used by asum.ys (linked on course examples page) with at least 10 entries.
• (20) Implement a swap procedure equivalent to the following C code:
void swap(long *xp, long *yp) {
long t0 = *xp;
long t1 = *yp;
*xp = t1;
*yp = t0;
• (20) Implement a sort procedure that takes a pointer to an array and length of the array as arguments and sorts the input array using Selection Sort. Your sort procedure should call your swap procedure (using a call instruction) to perform the swaps and it should sort the array in place – there’s no need to allocate additional memory for an output array.
• (10) Implement a main procedure to call your sort procedure (using a call instruction), passing the input array and array length as arguments.
I recommend using the “Y86-64 simulator” (linked on the course Links page) as a programming environment. Use the Y86-64 examples from class and the textbook as a guide.
Hint: Y86-64 doesn’t have leaq or mult (or shifts, for that matter), so calculating a pointer from a base address and index is kinda a pain… Instead, consider using pointer arithmetic like we did back in assignment 4!
Hint: Y86-64 doesn’t have cmpq or testq, either; subq will do the trick, but be careful with the side effects!
Name your source file 5-1.ys.
2. [20] Draw a circuit (using AND, OR, and/or NOT gates) with inputs A, B, C, and D and one output such that the output is on only if A is on and B is off or C is on and D is off (e.g., (A && !B) || (C && !D)). See Figure 4.10 for an example.
Include your answer in your solutions document (a picture of a drawing is sufficient). Label
your inputs!
3. [20] In our example Y86-64 programs, such as the Sum function shown in Figure 4.6, we
encounter many cases (e.g., lines 2 and 10) in which we want to add a constant value to a
register. This requires first using an irmovq instruction to set a register to the constant, and
then an addq instruction to add this value to the destination register. Using Figure 4.18 as a
guide, draw a diagram expressing how the existing Y86-64 architecture could implement a new
iaddq instruction to accomplish this functionality.
Write your answer in your solutions document.

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