#define Alu

using NUnit.Framework;
using System.Collections.Generic;

namespace Ryujinx.Tests.Cpu
{
    [Category("Alu")]
    public sealed class CpuTestAlu : CpuTest
    {
#if Alu

#region "Helper methods"
        private static uint GenLeadingSignsMinus32(int cnt) // 0 <= cnt <= 31
        {
            return ~GenLeadingZeros32(cnt + 1);
        }

        private static ulong GenLeadingSignsMinus64(int cnt) // 0 <= cnt <= 63
        {
            return ~GenLeadingZeros64(cnt + 1);
        }

        private static uint GenLeadingSignsPlus32(int cnt) // 0 <= cnt <= 31
        {
            return GenLeadingZeros32(cnt + 1);
        }

        private static ulong GenLeadingSignsPlus64(int cnt) // 0 <= cnt <= 63
        {
            return GenLeadingZeros64(cnt + 1);
        }

        private static uint GenLeadingZeros32(int cnt) // 0 <= cnt <= 32
        {
            if (cnt == 32) return 0u;
            if (cnt == 31) return 1u;

            uint rnd  = TestContext.CurrentContext.Random.NextUInt();
            int  mask = int.MinValue;

            return (rnd >> (cnt + 1)) | ((uint)mask >> cnt);
        }

        private static ulong GenLeadingZeros64(int cnt) // 0 <= cnt <= 64
        {
            if (cnt == 64) return 0ul;
            if (cnt == 63) return 1ul;

            ulong rnd  = TestContext.CurrentContext.Random.NextULong();
            long  mask = long.MinValue;

            return (rnd >> (cnt + 1)) | ((ulong)mask >> cnt);
        }
#endregion

#region "ValueSource (Types)"
        private static IEnumerable<ulong> _GenLeadingSignsX_()
        {
            for (int cnt = 0; cnt <= 63; cnt++)
            {
                yield return GenLeadingSignsMinus64(cnt);
                yield return GenLeadingSignsPlus64(cnt);
            }
        }

        private static IEnumerable<uint> _GenLeadingSignsW_()
        {
            for (int cnt = 0; cnt <= 31; cnt++)
            {
                yield return GenLeadingSignsMinus32(cnt);
                yield return GenLeadingSignsPlus32(cnt);
            }
        }

        private static IEnumerable<ulong> _GenLeadingZerosX_()
        {
            for (int cnt = 0; cnt <= 64; cnt++)
            {
                yield return GenLeadingZeros64(cnt);
            }
        }

        private static IEnumerable<uint> _GenLeadingZerosW_()
        {
            for (int cnt = 0; cnt <= 32; cnt++)
            {
                yield return GenLeadingZeros32(cnt);
            }
        }
#endregion

        [Test, Pairwise, Description("CLS <Xd>, <Xn>")]
        public void Cls_64bit([Values(0u, 31u)] uint rd,
                              [Values(1u, 31u)] uint rn,
                              [ValueSource(nameof(_GenLeadingSignsX_))] ulong xn)
        {
            uint opcode = 0xDAC01400; // CLS X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("CLS <Wd>, <Wn>")]
        public void Cls_32bit([Values(0u, 31u)] uint rd,
                              [Values(1u, 31u)] uint rn,
                              [ValueSource(nameof(_GenLeadingSignsW_))] uint wn)
        {
            uint opcode = 0x5AC01400; // CLS W0, W0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            uint w31 = TestContext.CurrentContext.Random.NextUInt();

            SingleOpcode(opcode, x1: wn, x31: w31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("CLZ <Xd>, <Xn>")]
        public void Clz_64bit([Values(0u, 31u)] uint rd,
                              [Values(1u, 31u)] uint rn,
                              [ValueSource(nameof(_GenLeadingZerosX_))] ulong xn)
        {
            uint opcode = 0xDAC01000; // CLZ X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("CLZ <Wd>, <Wn>")]
        public void Clz_32bit([Values(0u, 31u)] uint rd,
                              [Values(1u, 31u)] uint rn,
                              [ValueSource(nameof(_GenLeadingZerosW_))] uint wn)
        {
            uint opcode = 0x5AC01000; // CLZ W0, W0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            uint w31 = TestContext.CurrentContext.Random.NextUInt();

            SingleOpcode(opcode, x1: wn, x31: w31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("RBIT <Xd>, <Xn>")]
        public void Rbit_64bit([Values(0u, 31u)] uint rd,
                               [Values(1u, 31u)] uint rn,
                               [Values(0x0000000000000000ul, 0x7FFFFFFFFFFFFFFFul,
                                       0x8000000000000000ul, 0xFFFFFFFFFFFFFFFFul)] ulong xn)
        {
            uint opcode = 0xDAC00000; // RBIT X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("RBIT <Wd>, <Wn>")]
        public void Rbit_32bit([Values(0u, 31u)] uint rd,
                               [Values(1u, 31u)] uint rn,
                               [Values(0x00000000u, 0x7FFFFFFFu,
                                       0x80000000u, 0xFFFFFFFFu)] uint wn)
        {
            uint opcode = 0x5AC00000; // RBIT W0, W0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            uint w31 = TestContext.CurrentContext.Random.NextUInt();

            SingleOpcode(opcode, x1: wn, x31: w31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("REV16 <Xd>, <Xn>")]
        public void Rev16_64bit([Values(0u, 31u)] uint rd,
                                [Values(1u, 31u)] uint rn,
                                [Values(0x0000000000000000ul, 0x7FFFFFFFFFFFFFFFul,
                                        0x8000000000000000ul, 0xFFFFFFFFFFFFFFFFul)] ulong xn)
        {
            uint opcode = 0xDAC00400; // REV16 X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("REV16 <Wd>, <Wn>")]
        public void Rev16_32bit([Values(0u, 31u)] uint rd,
                                [Values(1u, 31u)] uint rn,
                                [Values(0x00000000u, 0x7FFFFFFFu,
                                        0x80000000u, 0xFFFFFFFFu)] uint wn)
        {
            uint opcode = 0x5AC00400; // REV16 W0, W0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            uint w31 = TestContext.CurrentContext.Random.NextUInt();

            SingleOpcode(opcode, x1: wn, x31: w31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("REV32 <Xd>, <Xn>")]
        public void Rev32_64bit([Values(0u, 31u)] uint rd,
                                [Values(1u, 31u)] uint rn,
                                [Values(0x0000000000000000ul, 0x7FFFFFFFFFFFFFFFul,
                                        0x8000000000000000ul, 0xFFFFFFFFFFFFFFFFul)] ulong xn)
        {
            uint opcode = 0xDAC00800; // REV32 X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("REV <Wd>, <Wn>")]
        public void Rev32_32bit([Values(0u, 31u)] uint rd,
                                [Values(1u, 31u)] uint rn,
                                [Values(0x00000000u, 0x7FFFFFFFu,
                                        0x80000000u, 0xFFFFFFFFu)] uint wn)
        {
            uint opcode = 0x5AC00800; // REV W0, W0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            uint w31 = TestContext.CurrentContext.Random.NextUInt();

            SingleOpcode(opcode, x1: wn, x31: w31);

            CompareAgainstUnicorn();
        }

        [Test, Pairwise, Description("REV64 <Xd>, <Xn>")]
        public void Rev64_64bit([Values(0u, 31u)] uint rd,
                                [Values(1u, 31u)] uint rn,
                                [Values(0x0000000000000000ul, 0x7FFFFFFFFFFFFFFFul,
                                        0x8000000000000000ul, 0xFFFFFFFFFFFFFFFFul)] ulong xn)
        {
            uint opcode = 0xDAC00C00; // REV64 X0, X0
            opcode |= ((rn & 31) << 5) | ((rd & 31) << 0);

            ulong x31 = TestContext.CurrentContext.Random.NextULong();

            SingleOpcode(opcode, x1: xn, x31: x31);

            CompareAgainstUnicorn();
        }
#endif
    }
}