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

Day 3 and can't decide whether to take a nap or get a coffee. Good 2 hours to go and some code needs written. Maybe should expand this poor opcode list today

export const opcodes: { [key: number]: string } = { 0b00000000: "add", // add <dst> <src1> <src2> - dst <- src1 + src2 0b00000001: "sub", // sub <dst> <src1> <src2> - dst <- src1 - src2 0b11110000: "hlt", // hlt <?> <?> <?> - halt program execution 0b11110001: "hcf", // hcf <?> <?> <?> - halt and catch fire }
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kissa.bsky.social

Got a cup of coffee and made a plan for arithmetic instructions. Note the absence of unsigned operators like logical shift right, because who needs those when all words are signed? Note that mov is considered one of the arithmetic opcodes (it's similar in structure to e.g. neg, just does nothing)

Instructions Arithmetic instructions (0-15) add op1, op2, op3 ; op1 <- op2 + op3 00000000 sub op1, op2, op3 ; op1 <- op2 - op3 00000001 mul op1, op2, op3 ; op1 <- op2 * op3 00000010 div op1, op2, op3 ; op1 <- op2 / op3 00000011 mod op1, op2, op3 ; op1 <- op2 % op3 00000100 and op1, op2, op3 ; op1 <- op2 & op3 00000101 or op1, op2, op3 ; op1 <- op2 | op3 00000110 xor op1, op2, op3 ; op1 <- op2 ^ op3 00000111 shl op1, op2, op3 ; op1 <- op2 << op3 00001000 shr op1, op2, op3 ; op1 <- op2 >> op3 00001001 add1 op1, op2 ; op1 <- op2 + 1 00001010 sub1 op1, op2 ; op1 <- op2 - 1 00001011 mov op1, op2 ; op1 <- op2 00001100 Arithmetic instructions ending in 1101, 1110, 1111 are reserved. Some candidates: abs op1, op2 ; op1 <- abs(op2) sgn op1, op2 ; op1 <- sign(op2) neg op1, op2 ; op1 <- -op2 add2 op1, op2 ; op1 <- op2 + 2 sub2 op1, op2 ; op1 <- op2 - 2
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kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
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