Crafter.Math/project.cpp

//SPDX-License-Identifier: LGPL-3.0-only
//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®

import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    std::array<fs::path, 8> mathInterfaces = {
        "interfaces/Crafter.Math-Basic",
        "interfaces/Crafter.Math",
        "interfaces/Crafter.Math-Common",
        "interfaces/Crafter.Math-Vector",
        "interfaces/Crafter.Math-Intersection",
        "interfaces/Crafter.Math-MatrixRowMajor",
        "interfaces/Crafter.Math-VectorF16",
        "interfaces/Crafter.Math-VectorF32",
    };

    Configuration cfg;
    cfg.path = "./";
    cfg.name = "Crafter.Math";
    cfg.outputName = "Crafter.Math";
    cfg.type = ConfigurationType::LibraryStatic;
    ApplyStandardArgs(cfg, args);
    {
        std::array<fs::path, 0> impls = {};
        cfg.GetInterfacesAndImplementations(mathInterfaces, impls);
    }

    // SIMD tier matrix: each tier rebuilds the math interfaces with its own
    // -march so codegen actually varies. Per-arch gating is just an `if`
    // around the AddMarchVariants call.
    std::array<MarchTier, 3> x86Tiers = {{
        {"sapphirerapids", "native"},
        {"x86-64-v4",      "generic"},
        {"x86-64-v3",      "generic"},
    }};
    // RISC-V tiers mirror the x86 selector: register width is picked from
    // the guaranteed VLEN encoded in the march's Zvl* suffix. rv64gcv →
    // ZVL128B (matches the RVA23 baseline).
    std::array<MarchTier, 3> riscvTiers = {{
        {"rv64gcv_zvl512b", "generic"},
        {"rv64gcv_zvl256b", "generic"},
        {"rv64gcv",         "generic"},
    }};

    const std::string_view target = cfg.target;
    const bool isX86 = target.starts_with("x86_64") || target.starts_with("i686");
    const bool isRiscv = target.starts_with("riscv");
    for (std::string_view name : { "Vector", "Intersection", "Matrix" }) {
        if (isX86)   cfg.AddMarchVariants(name, mathInterfaces, x86Tiers);
        if (isRiscv) cfg.AddMarchVariants(name, mathInterfaces, riscvTiers);
    }

    return cfg;
}