3 ms·

The lack of a dup opcode in Wasm as mentioned in the post is quite annoying when trying to generate compact code. I wish something like it had made it into the

by kg 5mo ago

The lack of a dup opcode in Wasm as mentioned in the post is quite annoying when trying to generate compact code. I wish something like it had made it into the spec.

thomasmg 5mo ago
You could use "local.tee". It is kind of is "store" + "duplicate".
- asibahi 5mo ago
  `local.tee` doesn't duplicate. it just doesn't remove the value from the stack. (so it is "just" `local.set` followed by `local.get`)
  - thomasmg 5mo ago
    Sure. But it does save you one instruction: "tee", "get" instead of "set", "get", "get".