Reinterpret

(module
  (import "console" "log" (func $log (param i32)))
  (func $main
    ;; the value `10000000_00000000_00000000_00000000` in binary
    ;; maps to `-0` as a floating point and to `-2147483648` as an integer.
    f32.const -0 ;; push an f32 onto the stack
    i32.reinterpret_f32 ;; reinterpret the bytes of the f32 as i32
    call $log ;; log the result
  )
  (start $main)
)

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

;; the value `10000000_00000000_00000000_00000000` in binary
;; maps to `-0` as a floating point and to `-2147483648` as an integer
;; push an f32 onto the stack
f32.const -0
;; reinterpret the bytes of the f32 as i32
i32.reinterpret_f32
;; the top item on the stack will now be the value -2147483648 of type i32