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 |