Convert

The convert instructions, are used for converting integer numbers to floating point numbers. There are signed and unsigned versions of this instruction.

Try it

(module
  (import "console" "log" (func $log (param f32)))
  (func $main

    i32.const 10 ;; push an i32 onto the stack

    f32.convert_i32_s ;; convert from signed i32 to f32

    call $log ;; log the result

  )
  (start $main)
)

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

Syntax

wasm

;; push an i32 onto the stack
i32.const 10

;; convert from signed i32 to f32
f32.convert_i32_s

;; the top item on the stack will now be the value 10 of type f32

Instruction	Binary opcode
`f32.convert_i32_s`	`0xb2`
`f32.convert_i32_u`	`0xb3`
`f32.convert_i64_s`	`0xb4`
`f32.convert_i64_u`	`0xb5`
`f64.convert_i32_s`	`0xb7`
`f64.convert_i32_u`	`0xb8`
`f64.convert_i64_s`	`0xb9`
`f64.convert_i64_u`	`0xba`