大於或等於
ge 指令,即大於等於的縮寫,用於檢查一個數字是否大於或等於另一個數字。如果第一個數字大於或等於第二個數字,則將 1 推入堆疊,否則將 0 推入堆疊。
整數型別有針對有符號 (ge_s) 和無符號 (ge_u) 數字的獨立的大於等於指令。
試一試
(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.ge_u ;; check if `10` is greater than or equal to '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 },
});
語法
wat
;; load 2 numbers on to the stack
local.get $num
i32.const 2
;; check if $num is greater than or equal to '2'
i32.ge_u
;; if $num is greater than or equal to the `2`, `1` will be pushed on to the stack,
;; otherwise `0` will be pushed on to the stack.
| 指令 | 二進位制操作碼 |
|---|---|
i32.ge_s |
0x4e |
i32.ge_u |
0x4f |
i64.ge_s |
0x59 |
i64.ge_u |
0x5a |
f32.ge |
0x60 |
f64.ge |
0x66 |