Local tee
The local.tee instruction sets the value of a local variable and loads the value onto the stack.
The instruction is named after the T-splitter used in plumbing.
Try it
(module
(import "console" "log" (func $log (param i32)))
(func $main
(local $var i32) ;; create a local variable named $var
(i32.const 10) ;; load `10` onto the stack
local.tee $var ;; set the $var to `10` and keep `10` on the stack
call $log ;; log the top item on the stack (10)
)
(start $main)
)
const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });
Syntax
wat
;; load the number 2 onto the stack
i32.const 2
;; store the number 2 in the variable $val and load it on the stack
local.tee $val
| Instruction | Binary opcode |
|---|---|
local.tee |
0x22 |