AdventOfCode2022/4/README.md

Day 4

🎁🎁🎁🎁 Today's language: gnu x86-64 (and alternatively c)

Today I wanted to use OpenAI to solve the tasks using gnu x86-64, which I have never used before (I did some small things in 6502-asssembly, so it wasn't all new). The prompt can be seen in prompt.txt. It did a lot of things right, however:

• It did generate x86 (32-bit) code because I did not specify x86-64. So I changed the int $0x80 system calls to use syscall (which also meant I had to change all the registers and syscall numbers)
• It did get the argument order for sscanf wrong, even when I specifically asked it told me that the line to read comes last
• It did not correctly implement the logic to test the condition
• It sometimes me wrong syscall numbers (they were just wrong, not even x86)
• It told me the read syscall can read until a newline by passing newline as last arg

So I had to fix all that. I tried to exclusively use the AI to get answers to my questions, however I did sometimes revert to the internet. It was still a good starting point and provided lots of help. At the end of the evening next morning I had coded the task in x86-64 assembly.

To test scanf, I gave it the exact same prompt but said I wanted it in c. It instantly produced compilable c code that gave the right answer...

#  for the assembly program
make asm
./day4
# for the c promgram
make c
./day4