eq: Wasm text instruction

The eq instructions, short for equal, check if two numbers are equal. If both numbers are equal 1 will be pushed on to the stack, otherwise 0 will be pushed on to the stack.

Similarly, the eqz instructions check if a number is equal to zero, the eqz instructions are only available for the integer types and not for the floating point types.

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.eq ;; check if `10` is 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: false } 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 equal to '2' i32.eq ;; if $num is equal to `2`, `1` will be pushed on to the stack, ;; otherwise `0` will be pushed on to the stack. 
Instruction Binary opcode
i32.eqz 0x45
i32.eq 0x46
i64.eqz 0x50
i64.eq 0x51
f32.eq 0x5b
f64.eq 0x61