Ryujinx/Ryujinx.Tests/Cpu/Arm64CodeGenCommonTests.cs

using ARMeilleure.CodeGen.Arm64;
using NUnit.Framework;

namespace Ryujinx.Tests.Cpu
{
    public class Arm64CodeGenCommonTests
    {
        public struct TestCase
        {
            public ulong Value;
            public bool Valid;
            public int ImmN;
            public int ImmS;
            public int ImmR;
        }

        public static readonly TestCase[] TestCases =
        {
            new() { Value = 0, Valid = false, ImmN = 0, ImmS = 0, ImmR = 0 },
            new() { Value = 0x970977f35f848714, Valid = false, ImmN = 0, ImmS = 0, ImmR = 0 },
            new() { Value = 0xffffffffffffffff, Valid = false, ImmN = 0, ImmS = 0, ImmR = 0 },
            new() { Value = 0x5555555555555555, Valid = true, ImmN = 0, ImmS = 0x3c, ImmR = 0 },
            new() { Value = 0xaaaaaaaaaaaaaaaa, Valid = true, ImmN = 0, ImmS = 0x3c, ImmR = 1 },
            new() { Value = 0x6666666666666666, Valid = true, ImmN = 0, ImmS = 0x39, ImmR = 3 },
            new() { Value = 0x1c1c1c1c1c1c1c1c, Valid = true, ImmN = 0, ImmS = 0x32, ImmR = 6 },
            new() { Value = 0x0f0f0f0f0f0f0f0f, Valid = true, ImmN = 0, ImmS = 0x33, ImmR = 0 },
            new() { Value = 0xf1f1f1f1f1f1f1f1, Valid = true, ImmN = 0, ImmS = 0x34, ImmR = 4 },
            new() { Value = 0xe7e7e7e7e7e7e7e7, Valid = true, ImmN = 0, ImmS = 0x35, ImmR = 3 },
            new() { Value = 0xc001c001c001c001, Valid = true, ImmN = 0, ImmS = 0x22, ImmR = 2 },
            new() { Value = 0x0000038000000380, Valid = true, ImmN = 0, ImmS = 0x02, ImmR = 25 },
            new() { Value = 0xffff8fffffff8fff, Valid = true, ImmN = 0, ImmS = 0x1c, ImmR = 17 },
            new() { Value = 0x000000000ffff800, Valid = true, ImmN = 1, ImmS = 0x10, ImmR = 53 },
        };
        
        [Test]
        public void BitImmTests([ValueSource(nameof(TestCases))] TestCase test)
        {
            bool valid = CodeGenCommon.TryEncodeBitMask(test.Value, out int immN, out int immS, out int immR);

            Assert.That(valid, Is.EqualTo(test.Valid));
            Assert.That(immN, Is.EqualTo(test.ImmN));
            Assert.That(immS, Is.EqualTo(test.ImmS));
            Assert.That(immR, Is.EqualTo(test.ImmR));
        }
    }
}