The neg instructions, short for negate, are used to negate a number. That is, turn a positive number into a negative number and a negative number into a positive number.

Try it


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

;; round down

;; the top item on the stack will now be 2
Instruction Binary opcode
f32.neg 0x8c
f64.neg 0x9a