/*
 * Copyright (C) 2017-2018 Intel Corporation
 *
 * SPDX-License-Identifier: MIT
 *
 */

#include "gtest/gtest.h"
#include <algorithm>
#include <cstdint>
#include "runtime/helpers/string.h"

union GRF {
    float fRegs[8];
    uint32_t dwRegs[8];
    uint16_t wRegs[16];
};

// clang-format off
uint16_t gFlattenedIDsSimD8[] =
    {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

uint16_t gFlattenedIDsSimD1632[] =
    {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
        0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
        0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
        0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
        0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
        0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
        0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
        0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
        0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
        0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
        0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
        0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
        0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
        0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
        0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
        0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
        0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
        0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
        0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
        0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
};
// clang-format on

size_t getSizeFlattenedIDs(uint32_t simd, uint32_t lwsX, uint32_t lwsY, uint32_t lwsZ) {
    auto lws = lwsX * lwsY * lwsZ;
    lws = std::min(lws, 256u);

    auto iDsPerGrf = std::min(simd, 16u);
    auto numGRFs = (lws + iDsPerGrf - 1) / iDsPerGrf;

    return numGRFs * sizeof(GRF);
}

void generateFlattenedIDs(void *buffer, uint32_t simd, uint32_t lwsX, uint32_t lwsY, uint32_t lwsZ) {
    auto pSrc = simd == 8 ? gFlattenedIDsSimD8 : gFlattenedIDsSimD1632;
    auto copySize = getSizeFlattenedIDs(simd, lwsX, lwsY, lwsZ);

    memcpy_s(buffer, copySize, pSrc, copySize);
}

struct FlattenedIDFixture : public ::testing::TestWithParam<std::tuple<int, int, int, int>> {
    void SetUp() override {
        simd = std::get<0>(GetParam());
        localWorkSizeX = std::get<1>(GetParam());
        localWorkSizeY = std::get<2>(GetParam());
        localWorkSizeZ = std::get<3>(GetParam());

        localWorkSize = localWorkSizeX * localWorkSizeY * localWorkSizeZ;
        if (localWorkSize > 256) {
            localWorkSizeY = std::min(256 / localWorkSizeX, localWorkSizeY);
            localWorkSizeZ = std::min(256 / (localWorkSizeX * localWorkSizeY), localWorkSizeZ);
            localWorkSize = localWorkSizeX * localWorkSizeY * localWorkSizeZ;
        }

        memset(buffer, 0xff, sizeof(buffer));
    }

    void validateIDWithinLimits(uint32_t simd, uint32_t lwsX, uint32_t lwsY, uint32_t lwsZ) {
        auto numWorkItems = lwsX * lwsY * lwsZ;
        auto idsPerThread = simd;

        // As per BackEnd HLD, SIMD32 has 32 flattenedIDs per channel.  SIMD8/16 has up to 16 flattenedIDs.
        auto skipPerThread = simd == 32 ? 32 : 16;

        auto pBuffer = buffer;
        size_t itemIndex = 0;
        auto numWorkItemsRemaining = numWorkItems;
        while (numWorkItemsRemaining > 0) {
            EXPECT_LT(pBuffer[itemIndex], numWorkItems);
            ++itemIndex;
            if (idsPerThread == itemIndex) {
                pBuffer += skipPerThread;
                itemIndex = 0;
            }
            --numWorkItemsRemaining;
        }
    }

    void validateAllWorkItemsCovered(uint32_t simd, uint32_t lwsX, uint32_t lwsY, uint32_t lwsZ) {
        auto numWorkItems = lwsX * lwsY * lwsZ;
        auto idsPerThread = simd;

        // As per BackEnd HLD, SIMD32 has 32 localIDs per channel.  SIMD8/16 has up to 16 localIDs.
        auto skipPerThread = simd == 32 ? 32 : 16;

        // Initialize local ID hit table
        uint32_t localIDHitTable[8];
        memset(localIDHitTable, 0, sizeof(localIDHitTable));

        auto pBuffer = buffer;
        size_t itemIndex = 0;
        auto numWorkItemsRemaining = numWorkItems;
        while (numWorkItemsRemaining > 0) {
            // Flatten out the IDs
            auto workItem = pBuffer[itemIndex];
            ASSERT_LT(workItem, 256u);

            // Look up in the hit table
            auto &hitItem = localIDHitTable[workItem / 32];
            auto hitBit = 1 << (workItem % 32);

            // No double-hits
            EXPECT_EQ(0u, hitItem & hitBit);

            // Set that work item as hit
            hitItem |= hitBit;

            ++itemIndex;
            if (idsPerThread == itemIndex) {
                pBuffer += skipPerThread;
                itemIndex = 0;
            }
            --numWorkItemsRemaining;
        }

        // All entries in hit table should be in form of n^2 - 1
        for (unsigned int i : localIDHitTable) {
            EXPECT_EQ(0u, i & (i + 1));
        }
    }

    // Test parameters
    uint32_t localWorkSize;
    uint32_t localWorkSizeX;
    uint32_t localWorkSizeY;
    uint32_t localWorkSizeZ;
    uint32_t simd;

    // Provide support for a max LWS of 256
    // 32 threads @ SIMD8
    // 16 lanes per thread (SIMD8 - only 8 used)
    uint16_t buffer[32 * 16];
};

TEST_P(FlattenedIDFixture, checkIDWithinLimits) {
    generateFlattenedIDs(buffer, simd, localWorkSizeX, localWorkSizeY, localWorkSizeZ);

    validateIDWithinLimits(simd, localWorkSizeX, localWorkSizeY, localWorkSizeZ);
}

TEST_P(FlattenedIDFixture, checkAllWorkItemsCovered) {
    generateFlattenedIDs(buffer, simd, localWorkSizeX, localWorkSizeY, localWorkSizeZ);

    validateAllWorkItemsCovered(simd, localWorkSizeX, localWorkSizeY, localWorkSizeZ);
}

TEST_P(FlattenedIDFixture, sizeCalculationLocalIDs) {
    auto sizePerThreadData = getSizeFlattenedIDs(
        simd,
        localWorkSizeX,
        localWorkSizeY,
        localWorkSizeZ);

    // Should be multiple of GRFs
    auto sizeGRF = sizeof(GRF);
    EXPECT_EQ(0u, sizePerThreadData % sizeGRF);

    auto workItems = localWorkSizeX * localWorkSizeY * localWorkSizeZ;
    auto idsPerGRF = (simd == 8) ? 8 : 16;
    auto numGRFsExpected = (workItems + idsPerGRF - 1) / idsPerGRF;
    EXPECT_EQ(numGRFsExpected, sizePerThreadData / sizeGRF);
}

#define SIMDParams ::testing::Values(8, 16, 32)
#if HEAVY_DUTY_TESTING
#define LWSXParams ::testing::Values(1, 7, 8, 9, 15, 16, 17, 31, 32, 33, 64, 128, 256)
#define LWSYParams ::testing::Values(1, 2, 3, 4, 5, 6, 7, 8)
#define LWSZParams ::testing::Values(1, 2, 3, 4)
#else
#define LWSXParams ::testing::Values(1, 7, 8, 9, 15, 16, 17, 31, 32, 33, 64, 128, 256)
#define LWSYParams ::testing::Values(1, 2, 4, 8)
#define LWSZParams ::testing::Values(1)
#endif

INSTANTIATE_TEST_CASE_P(AllCombinations, FlattenedIDFixture, ::testing::Combine(SIMDParams, LWSXParams, LWSYParams, LWSZParams));

// To debug a specific configuration replace the list of Values with specific values.
// NOTE: You'll need a unique test prefix
INSTANTIATE_TEST_CASE_P(SingleTest, FlattenedIDFixture,
                        ::testing::Combine(
                            ::testing::Values(32),  //SIMD
                            ::testing::Values(5),   //LWSX
                            ::testing::Values(6),   //LWSY
                            ::testing::Values(7))); //LWSZ
