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Hello all.

I'm Ben. This is my blog for SPO600, where I will be posting content relevant to the course.

I have experience with many high level programming languages (ex. C, C++, Java, Perl, Python) and web languages (ex. NodeJS, PHP, learning asp.NET), but I have never worked with a low level language such as Assembly.

The main reason I enrolled in SPO600 this semester was because of the 'optimization' portion of the course. I know I am capable of programming, but I am not sure if I am programming well. I hope to learn how to program well, to use less CPU cycles, less memory, re-use variables, and improve the quality of my code.

I look forward to the rest of the semester in SPO600.

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Lab 2

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Lab 2 - 16/01/20 For this lab, we were given code that we looked at in class and asked to modify and report on the results. The code we were given iterates using a column index, increments through memory, and fills the bitmap with pixels. 6/7 - Adding TYA after :loop The TYA opcode takes the value of the Y register and places it in the A register. Since the A register is used to determine what color to set the pixel we are currently drawing, this will cause vertical stripes of different colors to be drawn. What is interesting is that the top left (0,0 coordinate) pixel does not conform to the vertical stripes. This is because that pixel is the only case where the A register is loaded outside of the TYA opcode, at the start of the program we load the A register with #$07, which causes the first pixel to be drawn yellow. 8/9 - Adding LSR after TYA The LSR opcode stands for Logical Shift Right. As the name describes, this shifts all bits one position to the right. Adding this opco...
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Lab 5 x86_64 Update

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This post will serve as a follow up post to the previous. The second part of lab 5 was fairly straightforward, and therefore this post will be fairly short since most of the content was covered in the previous post. The logic between the AArch64 version and x86_64 version has barely changed, the main notable difference is the use of the rax and rdx registers as the division quotient and remainder. This also removes the msub logic required on the AArch64 version, meaning that the code is very slightly smaller. Finally, instead of using the 48 decimal value to convert to ascii, I opted to use the hexadecimal 0x30. This produces the same result, but I decided on hex just to prove that I can do it. You can take a look at the x86_64 version  here .
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