luaur-code-gen 0.1.1

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::enums::ir_condition::IrCondition;
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;
use luaur_vm::enums::lua_type::lua_Type;

pub fn translate_builtin_bit_32_shift(
    build: &mut IrBuilder,
    cmd: IrCmd,
    nparams: i32,
    ra: i32,
    arg: i32,
    args: IrOp,
    nresults: i32,
    pcpos: i32,
) -> BuiltinImplResult {
    if nparams < 2 || nresults > 1 {
        return BuiltinImplResult {
            r#type: BuiltinImplType::None,
            actual_result_count: -1,
        };
    }

    let vm_reg_arg = build.vm_reg(arg as u8);
    builtin_check_double(build, vm_reg_arg, pcpos);
    builtin_check_double(build, args, pcpos);

    let va = builtin_load_double(build, vm_reg_arg);
    let vb = builtin_load_double(build, args);

    let vaui = build.inst_ir_cmd_ir_op(IrCmd::NUM_TO_UINT, va);

    let vbi = if let Some(vbd) = build.function.as_double_op(vb) {
        if vbd >= i32::MIN as f64 && vbd <= i32::MAX as f64 {
            build.const_int(vbd as i32)
        } else {
            build.inst_ir_cmd_ir_op(IrCmd::NUM_TO_INT, vb)
        }
    } else {
        build.inst_ir_cmd_ir_op(IrCmd::NUM_TO_INT, vb)
    };

    let known_good_shift = if let Some(val) = build.function.as_int_op(vbi) {
        (val as u32) < 32
    } else {
        false
    };

    if !known_good_shift {
        let const_32 = build.const_int(32);
        let cond = build.cond(IrCondition::UnsignedLess);
        let exit = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(IrCmd::CHECK_CMP_INT, vbi, const_32, cond, exit);
    }

    let shift = build.inst_ir_cmd_ir_op_ir_op(cmd, vaui, vbi);
    let value = build.inst_ir_cmd_ir_op(IrCmd::UINT_TO_NUM, shift);
    let vm_reg_ra = build.vm_reg(ra as u8);
    build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_DOUBLE, vm_reg_ra, value);

    if ra != arg {
        let tag = build.const_tag(lua_Type::LUA_TNUMBER as u8);
        build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_TAG, vm_reg_ra, tag);
    }

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