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kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
kissa.bsky.social

Actually need to implement a bunch of arithmetic instructions and test them somehow efficiently. Here's a start.

List of test instructions that ChatGPT wrote me. export const opcodes: { [key: number]: string } = { 0b00000000: "add", // add <op1> <op2> <op3> - op1 <- op2 + op3 0b00000001: "sub", // sub <op1> <op2> <op3> - op1 <- op2 - op3 0b00000010: "mul", // mul <op1> <op2> <op3> - op1 <- op2 * op3 // etc, ending with 0b00001100: "mov" 0b00010000: "adda", // add <op1> <op2> - op1 <- op1 + op2 0b00010001: "suba", // sub <op1> <op2> - op1 <- op1 - op2 0b00010010: "mula", // mul <op1> <op2> - op1 <- op1 * op2 // etc, ending with 0b00011100: "nop" 0b11110000: "hlt", // hlt <?> <?> <?> - halt program execution 0b11110001: "hcf", // hcf <?> <?> <?> - halt and catch fire }
Implementation of first 3 arithmetic instructions: if (instr === "add") { writeOperand(op1, op2value + op3value) } if (instr === "sub") { writeOperand(op1, op2value - op3value) } if (instr === "mul") { writeOperand(op1, op2value * op3value) } if (instr === "hlt") { return false } if (instr === "hcf") { error("Machine caught fire") } return true
test("arithmetic instructions", () => { testArithmetic(instr.add, 0x1234, 0x2345, 0x3579) testArithmetic(instr.sub, 0x4131, 0x2121, 0x2010) testArithmetic(instr.mul, 111, 20, 2220) testArithmetic(instr.mul, -111, 20, -2220) testArithmetic(instr.mul, -1, -0x7fff, 0x7fff) // TODO should overflow probably // testArithmetic(instr.mul, -1, -0x8000, -0x8000) })
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kissa.bsky.social

Now I need to take a break of few days, weeks, or months, depending on when I next manage to free up some time. This was a miserable week for writing code: I had planned 5 full working days and got some 11+ hours done. But such is life sometimes

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kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
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