lt: Wasm text instruction
Thelt instructions, short forless than, check if a number is less than another number. If the first number is less than the second number equal1 will be pushed on to the stack, otherwise0 will be pushed on to the stack.
The integer types have separate less than instructions for signed (lt_s) and unsigned (lt_u) numbers.
Try it
(module (import "env" "log_bool" (func $log_bool (param i32))) (func $main ;; load `10` and `2` onto the stack i32.const 10 i32.const 2 i32.lt_u ;; check if `10` is less than '2' call $log_bool ;; log the result ) (start $main))const url = "{%wasm-url%}";function log_bool(value) { console.log(Boolean(value)); // Expected output: false}await WebAssembly.instantiateStreaming(fetch(url), { env: { log_bool },});Syntax
wat
;; load 2 numbers on to the stacklocal.get $numi32.const 2;; check if $num is less than '2'i32.lt_u;; if $num is less than the `2`, `1` will be pushed on to the stack,;; otherwise `0` will be pushed on to the stack.| Instruction | Binary opcode |
|---|---|
i32.lt_s | 0x48 |
i32.lt_u | 0x49 |
i64.lt_s | 0x53 |
i64.lt_u | 0x54 |
f32.lt | 0x5d |
f64.lt | 0x63 |