Extend

Name: Extend - WebAssembly | MDN
Rating: 4.6 (9739 reviews)

The extend instructions, are used to convert (extend) numbers of type i32 to type i64. There are signed and unsigned versions of this instruction.

Try it

(module (import "console" "log" (func $log (param i64))) (func $main i32.const 10 ;; push an i32 onto the stack i64.extend_i32_s ;; sign-extend from i32 to i64 call $log ;; log the result ) (start $main) )

const url = "{%wasm-url%}"; await WebAssembly.instantiateStreaming(fetch(url), { console });

Syntax

wat

;; push an i32 onto the stack i32.const 10 ;; sign-extend from i32 to i64 i64.extend_i32_s ;; the top item on the stack will now be the value 10 of type i64

Instruction	Binary opcode
`i64.extend_i32_s`	`0xac`
`i64.extend_i32_u`	`0xad`