mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-21 18:15:58 +00:00
8892c25520
Previously, using `wasm-decompile` to decompile the Wasm bytecode on
the `wasm.html` example page gave this output:
```
export function fib(a:int):int {
if (a < 2) { return 1 }
return fib(a - 2) + fib(a - 1);
}
```
With this change the bytecode now decompiles to:
```
export function fib(a:int):int {
if (a <= 0) { return 0 }
if (a == 1) { return 1 }
return fib(a - 2) + fib(a - 1);
}
```
This means that the example page now prints the correct answer of 55 to
the console for `fib(10)`. Previously, `fib(10)` returned 89.
I also used `wasm-opt -Oz`, which removed an unnecessary `return`
instruction, saving 1 byte!
20 lines
973 B
HTML
20 lines
973 B
HTML
<html>
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<body>
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<script>
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const bytes = new Uint8Array([
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0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x06, 0x01, 0x60,
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0x01, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01, 0x03,
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0x66, 0x69, 0x62, 0x00, 0x00, 0x0a, 0x29, 0x01, 0x27, 0x00, 0x20, 0x00,
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0x41, 0x00, 0x4c, 0x04, 0x40, 0x41, 0x00, 0x0f, 0x0b, 0x20, 0x00, 0x41,
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0x01, 0x46, 0x04, 0x40, 0x41, 0x01, 0x0f, 0x0b, 0x20, 0x00, 0x41, 0x02,
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0x6b, 0x10, 0x00, 0x20, 0x00, 0x41, 0x01, 0x6b, 0x10, 0x00, 0x6a, 0x0b
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]);
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WebAssembly.compile(bytes)
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.then(module => WebAssembly.instantiate(module))
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.then(instance => instance.exports.fib(10))
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.then(value => console.log("Calculated fib(10) with wasm and got " + value))
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.catch(err => console.log(err.message));
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</script>
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</body>
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</html>
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