luaur-code-gen 0.1.1

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::records::register_set::RegisterSet;

pub fn require_variadic_sequence(
    source_rs: &mut RegisterSet,
    def_rs: &RegisterSet,
    mut vararg_start: u8,
) {
    if !def_rs.vararg_seq {
        // Peel away registers from variadic sequence that we define
        while def_rs.regs[vararg_start as usize / 64] & (1u64 << (vararg_start as usize % 64)) != 0
        {
            vararg_start = vararg_start.wrapping_add(1);
        }

        // sourceRs.varargSeq might already be true if the use was required earlier.
        // Assert the start is consistent.
        if source_rs.vararg_seq {
            assert!(source_rs.vararg_start == vararg_start);
        }

        source_rs.vararg_seq = true;
        source_rs.vararg_start = vararg_start;
    } else {
        // Variadic use sequence might include registers before def sequence
        for i in vararg_start..def_rs.vararg_start {
            let word_idx = (i as usize) / 64;
            let bit_idx = (i as usize) % 64;

            if def_rs.regs[word_idx] & (1u64 << bit_idx) == 0 {
                source_rs.regs[word_idx] |= 1u64 << bit_idx;
            }
        }
    }
}