Floor

The floor instructions, are used for getting the value of a number rounded down to the next integer.

floor differs from trunc when used on negative numbers, floor will round down in those cases while trunc will round up.

Try it

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

    f32.const -2.7 ;; load a number onto the stack
    f32.floor ;; round down
    call $log ;; log the result

  )
  (start $main)
)

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

Syntax

wasm

;; load a number onto the stack
f32.const -2.7

;; round down
f32.floor

;; the top item on the stack will now be -3

Instruction	Binary opcode
`f32.floor`	`0x8e`
`f64.floor`	`0x9c`