Greater than

The gt instructions, short for greater than, check if a number is greater than another number. If the first number is greater than the second number equal 1 will be pushed on to the stack, otherwise 0 will be pushed on to the stack.

The integer types have separate greater than instructions for signed (gt_s) and unsigned (gt_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.gt_u ;; check if `10` is greater than '2' call $log_bool ;; log the result ) (start $main) )

const url = "{%wasm-url%}"; function log_bool(value) { console.log(Boolean(value)); // Expected output: true } await WebAssembly.instantiateStreaming(fetch(url), { env: { log_bool }, });

Syntax

wat

;; load 2 numbers on to the stack local.get $num i32.const 2 ;; check if $num is greater than '2' i32.gt_u ;; if $num is greater than the `2`, `1` will be pushed on to the stack, ;; otherwise `0` will be pushed on to the stack.

Instruction	Binary opcode
`i32.gt_s`	`0x4a`
`i32.gt_u`	`0x4b`
`i64.gt_s`	`0x55`
`i64.gt_u`	`0x56`
`f32.gt`	`0x5e`
`f64.gt`	`0x64`