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Greater than - WebAssembly | MDN
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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 |