public static int PopCount(uint value) { if (Popcnt.IsSupported) { return((int)Popcnt.PopCount(value)); } if (AdvSimd.Arm64.IsSupported) { // PopCount works on vector so convert input value to vector first. Vector64 <uint> input = Vector64.CreateScalar(value); Vector64 <byte> aggregated = AdvSimd.Arm64.AddAcross(AdvSimd.PopCount(input.AsByte())); return(aggregated.ToScalar()); } return(SoftwareFallback(value));
public static int PopCount(uint value) { if (Popcnt.IsSupported) { return((int)Popcnt.PopCount(value)); } if (AdvSimd.Arm64.IsSupported) { // PopCount works on vector so convert input value to vector first. // Vector64.CreateScalar(uint) generates suboptimal code by storing and // loading the result to memory. // See https://github.com/dotnet/runtime/issues/35976 for details. // Hence use Vector64.Create(ulong) to create Vector64<ulong> and operate on that. Vector64 <ulong> input = Vector64.Create((ulong)value); Vector64 <byte> aggregated = AdvSimd.Arm64.AddAcross(AdvSimd.PopCount(input.AsByte())); return(aggregated.ToScalar()); } return(SoftwareFallback(value));
public Intro() { var middleVector = Vector128.Create(1.0f); // middleVector = <1,1,1,1> middleVector = Vector128.CreateScalar(-1.0f); // middleVector = <-1,0,0,0> var floatBytes = Vector64.AsByte(Vector64.Create(1.0f, -1.0f)); // floatBytes = <0, 0, 128, 63, 0, 0, 128, 191> if (Avx.IsSupported) { var left = Vector256.Create(-2.5f); // <-2.5, -2.5, -2.5, -2.5, -2.5, -2.5, -2.5, -2.5> var right = Vector256.Create(5.0f); // <5, 5, 5, 5, 5, 5, 5, 5> Vector256 <float> result = Avx.AddSubtract(left, right); // result = <-7.5, 2.5, -7.5, 2.5, -7.5, 2.5, -7.5, 2.5>xit left = Vector256.Create(-1.0f, -2.0f, -3.0f, -4.0f, -50.0f, -60.0f, -70.0f, -80.0f); right = Vector256.Create(0.0f, 2.0f, 3.0f, 4.0f, 50.0f, 60.0f, 70.0f, 80.0f); result = Avx.UnpackHigh(left, right); // result = <-3, 3, -4, 4, -70, 70, -80, 80> result = Avx.UnpackLow(left, right); // result = <-1, 1, -2, 2, -50, 50, -60, 60> result = Avx.DotProduct(left, right, 0b1111_0001); // result = <-30, 0, 0, 0, -17400, 0, 0, 0> bool testResult = Avx.TestC(left, right); // testResult = true testResult = Avx.TestC(right, left); // testResult = false Vector256 <float> result1 = Avx.Divide(left, right); var plusOne = Vector256.Create(1.0f); result = Avx.Compare(right, result1, FloatComparisonMode.OrderedGreaterThanNonSignaling); result = Avx.Compare(right, result1, FloatComparisonMode.UnorderedNotLessThanNonSignaling); left = Vector256.Create(0.0f, 3.0f, -3.0f, 4.0f, -50.0f, 60.0f, -70.0f, 80.0f); right = Vector256.Create(0.0f, 2.0f, 3.0f, 2.0f, 50.0f, -60.0f, 70.0f, -80.0f); Vector256 <float> nanInFirstPosition = Avx.Divide(left, right); left = Vector256.Create(1.1f, 3.3333333f, -3.0f, 4.22f, -50.0f, 60.0f, -70.0f, 80.0f); Vector256 <float> InfInFirstPosition = Avx.Divide(left, right); left = Vector256.Create(-1.1f, 3.0f, 1.0f / 3.0f, MathF.PI, -50.0f, 60.0f, -70.0f, 80.0f); right = Vector256.Create(0.0f, 2.0f, 3.1f, 2.0f, 50.0f, -60.0f, 70.0f, -80.0f); Vector256 <float> compareResult = Avx.Compare(left, right, FloatComparisonMode.OrderedGreaterThanNonSignaling); // compareResult = <0, NaN, 0, NaN, 0, NaN, 0, NaN> Vector256 <float> mixed = Avx.BlendVariable(left, right, compareResult); // mixed = <-1, 2, -3, 2, -50, -60, -70, -80> //left = Vector256.Create(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f); //right = Vector256.Create(1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f); Vector256 <float> other = right = Vector256.Create(0.0f, 2.0f, 3.0f, 2.0f, 50.0f, -60.0f, 70.0f, -80.0f); bool bRes = Avx.TestZ(plusOne, compareResult); bool bRes2 = Avx.TestC(plusOne, compareResult); bool allTrue = !Avx.TestZ(compareResult, compareResult); compareResult = Avx.Compare(nanInFirstPosition, right, FloatComparisonMode.OrderedEqualNonSignaling); // compareResult = <0, NaN, 0, NaN, 0, NaN, 0, NaN> compareResult = Avx.Compare(nanInFirstPosition, right, FloatComparisonMode.UnorderedEqualNonSignaling); compareResult = Avx.Compare(InfInFirstPosition, right, FloatComparisonMode.UnorderedNotLessThanOrEqualNonSignaling); compareResult = Avx.Compare(InfInFirstPosition, right, FloatComparisonMode.OrderedGreaterThanNonSignaling); var left128 = Vector128.Create(1.0f, 2.0f, 3.0f, 4.0f); var right128 = Vector128.Create(2.0f, 3.0f, 4.0f, 5.0f); Vector128 <float> compResult128 = Sse.CompareGreaterThan(left128, right128); // compResult128 = <0, 0, 0, 0> int res = Avx.MoveMask(compareResult); if (Fma.IsSupported) { Vector256 <float> resultFma = Fma.MultiplyAdd(left, right, other); // = left * right + other for each element resultFma = Fma.MultiplyAddNegated(left, right, other); // = -(left * right + other) for each element resultFma = Fma.MultiplySubtract(left, right, other); // = left * right - other for each element Fma.MultiplyAddSubtract(left, right, other); // even elements (0, 2, ...) like MultiplyAdd, odd elements like MultiplySubtract } result = Avx.DotProduct(left, right, 0b1010_0001); // result = <-20, 0, 0, 0, -10000, 0, 0, 0> result = Avx.Floor(left); // result = <-3, -3, -3, -3, -3, -3, -3, -3> result = Avx.Add(left, right); // result = <2.5, 2.5, 2.5, 2.5, 2.5, 2.5, 2.5, 2.5> result = Avx.Ceiling(left); // result = <-2, -2, -2, -2, -2, -2, -2, -2> result = Avx.Multiply(left, right); // result = <-12.5, -12.5, -12.5, -12.5, -12.5, -12.5, -12.5, -12.5> result = Avx.HorizontalAdd(left, right); // result = <-5, -5, 10, 10, -5, -5, 10, 10> result = Avx.HorizontalSubtract(left, right); // result = <0, 0, 0, 0, 0, 0, 0, 0> double[] someDoubles = new double[] { 1.0, 3.0, -2.5, 7.5, 10.8, 0.33333 }; double[] someOtherDoubles = new double[] { 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 }; double[] someResult = new double[someDoubles.Length]; float[] someFloats = new float[] { 1, 2, 3, 4, 10, 20, 30, 40, 0 }; float[] someOtherFloats = new float[] { 1, 1, 1, 1, 1, 1, 1, 1 }; unsafe { fixed(double *ptr = &someDoubles[1]) { fixed(double *ptr2 = &someResult[0]) { Vector256 <double> res2 = Avx.LoadVector256(ptr); // res2 = <3, -2.5, 7.5, 10.8> Avx.Store(ptr2, res2); } } fixed(float *ptr = &someFloats[0]) { fixed(float *ptr2 = &someOtherFloats[0]) { Vector256 <float> res2 = Avx.DotProduct(Avx.LoadVector256(ptr), Avx.LoadVector256(ptr2), 0b0001_0001); //Avx.Store(ptr2, res2); } } } } }