Copy sign

The copysign instructions, are used to copy just the sign bit from one number to another.

Try it

Syntax

wasm

;; load two numbers onto the stack
f32.const 10
f32.const -1

;; copy just the sign bit from the second number (-1) to the first (10)
f32.copysign

;; the top item on the stack will now be -10
Instruction Binary opcode
f32.copysign 0x98
f64.copysign 0xa6