kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
There's a bug in the above code. Reading at address 65535 should work, and let's make it so that the memory wraps (in practice rarely happens, but details matter)
![index.test.ts:
✓ read word from memory [0.06ms]
12 |
13 | test("read at memory boundary", () => {
14 | mem[MEM_SIZE - 1] = 0x98
15 | mem[0] = 0x76
16 |
17 | expect(read(MEM_SIZE - 1)).toBe(0x9876)
^
error: expect(received).toBe(expected)
Expected: 39030
Received: NaN](https://cdn.bsky.app/img/feed_fullsize/plain/did:plc:ih3rt6r3sesh2flndp7oefwc/bafkreigsgtx6hbv6nvd3sct2mvujowo7l5lv35mzibgfhwuxz46mibm5by@jpeg)
I guess we need negative numbers too. Maybe all numbers should be signed for now, let's deal with the unsigned/signed complexity later.
![test("read negative word", () => {
mem[0] = 0xff
mem[1] = 0xff
expect(read(0)).toBe(-1)
})
test("boundary between negative and positive", () => {
mem[0] = 0x7f
mem[1] = 0xff
mem[2] = 0x80
mem[3] = 0x00
expect(read(0)).toBe(32767)
expect(read(2)).toBe(-32768)
})](https://cdn.bsky.app/img/feed_fullsize/plain/did:plc:ih3rt6r3sesh2flndp7oefwc/bafkreid6gkdwvfiebzvan6lwsqbn23r5e3yfo4iakseml3bclxgh7brncq@jpeg)
kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts