abi_vectorcall - The Rust Unstable Book

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# `abi_vectorcall`

The tracking issue for this feature is: #124485

Adds support for the Windows `"vectorcall"` ABI, the equivalent of `__vectorcall` in MSVC.

    extern "vectorcall" {
        fn add_f64s(x: f64, y: f64) -> f64;
    }

    fn main() {
        println!("{}", add_f64s(2.0, 4.0));
    }