Andreas Kling 38e224cd9f LibJS: Make overflowing arithmetic on 2x Int32 values faster ...

Instead of converting them to doubles and doing double math, just do the
arithmetic operation in i64 space instead.

This gives us a ~1.25x speed-up on this kind of micro-benchmark:

    (() => {
        let a = -2124299999;
        for (let i = 0; i < 100_000_000; ++i) {
            a + a;
        }
    })()

Same idea for Add, Sub, and Mul.

There's a fair bit of overflowing Int32 arithmetic in some of the
JetStream benchmarks, and this seems like an obvious improvement.

2025-10-07 18:28:26 +02:00

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