[kg]

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]

You could use "local.tee". It is kind of is "store" + "duplicate".

[asibahi]

`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]

Sure. But it does save you one instruction: "tee", "get" instead of "set", "get", "get".