luaur-code-gen 0.1.3

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::kind_a_64::KindA64;
use crate::records::register_a_64::RegisterA64;

pub const fn cast_reg(kind: KindA64, reg: RegisterA64) -> RegisterA64 {
    // Since RegisterA64::kind() and RegisterA64::index() are not marked const in their dependency card,
    // we must access the bits directly using the masks and shifts provided in the record's public API.
    let reg_kind_bits = reg.bits & RegisterA64::KIND_MASK;
    let kind_bits = kind as u8;

    // CODEGEN_ASSERT is not usable in const fn contexts because it expands to
    // non-const calls (assertCallHandler, intrinsics).
    // We use a standard assert! which is supported in const fns since Rust 1.57.
    assert!(kind_bits != reg_kind_bits);
    assert!(kind_bits != KindA64::none as u8 && reg_kind_bits != KindA64::none as u8);
    assert!(
        (kind_bits == KindA64::w as u8 || kind_bits == KindA64::x as u8)
            == (reg_kind_bits == KindA64::w as u8 || reg_kind_bits == KindA64::x as u8)
    );

    let reg_index_bits = reg.bits & RegisterA64::INDEX_MASK;

    RegisterA64 {
        bits: kind_bits | reg_index_bits,
    }
}