luaur-code-gen 0.1.0

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::builtin_impl_type::BuiltinImplType;
use crate::enums::ir_cmd::IrCmd;
use crate::functions::builtin_check_double::builtin_check_double;
use crate::functions::builtin_load_double::builtin_load_double;
use crate::records::builtin_impl_result::BuiltinImplResult;
use crate::records::ir_builder::IrBuilder;
use crate::records::ir_op::IrOp;

pub fn translate_builtin_math_lerp(
    build: &mut IrBuilder,
    nparams: i32,
    ra: i32,
    arg: i32,
    args: IrOp,
    arg3: IrOp,
    nresults: i32,
    _fallback: IrOp,
    pcpos: i32,
) -> BuiltinImplResult {
    if nparams < 3 || nresults > 1 {
        return BuiltinImplResult {
            r#type: BuiltinImplType::None,
            actual_result_count: -1,
        };
    }

    let ra_op = build.vm_reg(ra as u8);
    let arg_op = build.vm_reg(arg as u8);

    builtin_check_double(build, arg_op, pcpos);
    builtin_check_double(build, args, pcpos);
    builtin_check_double(build, arg3, pcpos);

    let a = builtin_load_double(build, arg_op);
    let b = builtin_load_double(build, args);
    let t = builtin_load_double(build, arg3);

    let sub_ba = build.inst_ir_cmd_ir_op_ir_op(IrCmd::SUB_NUM, b, a);
    let l = build.inst_ir_cmd_ir_op_ir_op_ir_op(IrCmd::MULADD_NUM, sub_ba, t, a);
    let one = build.const_double(1.0);
    let r = build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(IrCmd::SELECT_NUM, l, b, t, one);

    build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_DOUBLE, ra_op, r);

    if ra != arg {
        let tag_number = build.const_tag(3); // LUA_TNUMBER
        build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_TAG, ra_op, tag_number);
    }

    BuiltinImplResult {
        r#type: BuiltinImplType::Full,
        actual_result_count: 1,
    }
}