Subtraction
The sub
instructions, short for subtraction, are used for subtracting one number from another number, similar to the -
operator in other languages.
Try it
(module
(import "console" "log" (func $log (param i32)))
(func $main
;; load `10` and `3` onto the stack
i32.const 10
i32.const 3
i32.sub ;; subtract on number from the other
call $log ;; log the result
)
(start $main)
)
const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });
Syntax
wat
;; load two numbers onto the stack
i32.const 10
i32.const 3
;; subtract one number from the other
i32.sub
;; the top item on the stack will now be 7 (10 - 3 = 7)
Instruction | Binary opcode |
---|---|
i32.sub |
0x6b |
i64.sub |
0x7d |
f32.sub |
0x93 |
f64.sub |
0xa1 |