Absolute
The abs instructions, short for absolute, are used to get the absolute value of a number. That is, it returns x if x is positive, and the negation of x if x is negative.
Try it
(module
(import "console" "log" (func $log (param f32)))
(func $main
f32.const -10 ;; load a number onto the stack
f32.abs ;; calculate the absolute value
call $log ;; log the result
)
(start $main)
)
const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });
Syntax
wat
;; load a number onto the stack
f32.const -2
;; absolute
f32.abs
;; the top item on the stack will now be 2
| Instruction | Binary opcode |
|---|---|
f32.abs |
0x8b |
f64.abs |
0x99 |