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_int_64::builtin_check_int_64;
use crate::functions::builtin_load_int_64::builtin_load_int_64;
use crate::functions::vm_reg_op::vm_reg_op;
use crate::records::builtin_impl_result::BuiltinImplResult;
use crate::records::ir_builder::IrBuilder;
use crate::records::ir_op::IrOp;
use luaur_common::FFlag;
use luaur_vm::enums::lua_type::lua_Type;

pub fn translate_builtin_int_64_min_max(
    build: &mut IrBuilder,
    nparams: i32,
    ra: i32,
    arg: i32,
    args: IrOp,
    arg3: IrOp,
    nresults: i32,
    pcpos: i32,
    min: bool,
) -> 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_int_64(build, vm_reg_arg, pcpos);
    builtin_check_int_64(build, args, pcpos);

    let luau_codegen_integer_arg3_fix = FFlag::LuauCodegenIntegerArg3Fix.get();

    if luau_codegen_integer_arg3_fix {
        if nparams >= 3 {
            builtin_check_int_64(build, arg3, pcpos);
        }

        for i in 4..=nparams {
            let reg_idx = vm_reg_op(args) + (i - 2);
            let reg = build.vm_reg(reg_idx as u8);
            builtin_check_int_64(build, reg, pcpos);
        }
    }

    let va = builtin_load_int_64(build, vm_reg_arg);
    let vb = builtin_load_int_64(build, args);

    let cond = if min {
        build.cond(IrCondition::LessEqual)
    } else {
        build.cond(IrCondition::Greater)
    };

    let mut select_op =
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op_ir_op(IrCmd::SELECT_INT64, va, vb, vb, va, cond);

    if luau_codegen_integer_arg3_fix && nparams >= 3 {
        let vc = builtin_load_int_64(build, arg3);
        select_op = build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op_ir_op(
            IrCmd::SELECT_INT64,
            vc,
            select_op,
            select_op,
            vc,
            cond,
        );
    }

    let start_idx = if luau_codegen_integer_arg3_fix { 4 } else { 3 };
    for i in start_idx..=nparams {
        if !luau_codegen_integer_arg3_fix {
            let reg_idx = vm_reg_op(args) + (i - 2);
            let reg = build.vm_reg(reg_idx as u8);
            builtin_check_int_64(build, reg, pcpos);
        }

        let reg_idx = vm_reg_op(args) + (i - 2);
        let reg = build.vm_reg(reg_idx as u8);
        let vc = builtin_load_int_64(build, reg);

        select_op = build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op_ir_op(
            IrCmd::SELECT_INT64,
            vc,
            select_op,
            select_op,
            vc,
            cond,
        );
    }

    let vm_reg_ra = build.vm_reg(ra as u8);
    build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_INT64, vm_reg_ra, select_op);
    let tag = build.const_tag(lua_Type::LUA_TINTEGER 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,
    }
}