.NET 8 Update: Hardware Intrinsics

[pCYSl5EDgo]

This is a follow up pull request of #988.

Goals

Improve (U?Int16|32|64)|Single|Double|BooleanArrayFormatter with SIMD instruction and make them about twice as fast in .NET 8.
List<T>, ArraySegment<T> and (ReadOnly)?Memory<T>s can also be accelerated by this.

Without SIMD in .NET 6, the performance is generally improved by this proposal.

History

3 years have passed and .NET 7 introduced many convenient SIMD Hardware Intrinsics as I explained in this Japanese article.

SIMD Intrinsics between .NET Core3.1 and .NET 6 required fixed statement and unsafe pointer operation.
In .NET 7, Vector.LoadUnsafe(ref T source) emerged which requires reference of type T.
No, well, you end up having to go through the pseudo-pointer operations with the Unsafe class, but it is an advantage that fixed statement is unnecessary.

.NET 7 also added a lot of crossplatform SIMD instructions. There is no need to write a lot of platform dependent branches any more!

Changes

Finally, I am now able to write code that is (and I hope (must be)) more understandable to others than it was before.

I ran BenchmarkDotnet on my machine and found that this SIMD improvement performed about the same as the previous implementation on short arrays, which SIMD does not do well, and 2 to 5 times better on long arrays, which SIMD does well.

Annotation

This Draft Pull Request is for performance measurement and is not intended to be actually merged.
I will prepare a clean commit log Pull Request when you give the go-ahead.

[pCYSl5EDgo]

Test Codes

My environment. All benchmarks were done without dynamic PGO.

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22621.3007/22H2/2022Update/SunValley2)
Intel Core i7-8750H CPU 2.20GHz (Coffee Lake), 1 CPU, 12 logical and 6 physical cores
.NET SDK 8.0.101
  [Host] : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2
  Scalar : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT
  Vector : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2

Report column description

Method

• Old
  • Old implementation from PrimitiveFormatter
• Simd
  • Simd utilized implementation.

Job

• Scalar
  • Disabled all Hardware Intrinsics(including SIMD).
• Vector
  • This is the more common setting.

Setting

0 means length-0 empty array.
1 31 means length-1 array whose values are all 31.
4096 rand means length-4096 array whose values are randomly generated.

Baseline is Old Scalar.
Old Simd is for .NET 6 environment fallback.

ulong[] serialize benchmark report (x5 in .NET8, x3 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	69.99 ns	2.672 ns	69.10 ns	1.00
Simd	Scalar	0	65.10 ns	1.589 ns	65.46 ns	0.91
Old	Vector	0	65.63 ns	1.697 ns	65.67 ns	0.92
Simd	Vector	0	65.57 ns	2.616 ns	65.69 ns	0.94
Old	Scalar	1 31	68.51 ns	1.829 ns	68.42 ns	1.00
Simd	Scalar	1 31	67.83 ns	1.714 ns	68.19 ns	0.99
Old	Vector	1 31	68.96 ns	2.999 ns	68.82 ns	1.04
Simd	Vector	1 31	69.89 ns	1.454 ns	70.03 ns	1.02
Old	Scalar	1 rand	72.91 ns	1.965 ns	72.66 ns	1.00
Simd	Scalar	1 rand	68.78 ns	1.508 ns	69.22 ns	0.94
Old	Vector	1 rand	71.91 ns	2.296 ns	72.20 ns	0.99
Simd	Vector	1 rand	70.58 ns	0.838 ns	70.88 ns	0.97
Old	Scalar	3 31	74.68 ns	2.438 ns	74.21 ns	1.00
Simd	Scalar	3 31	69.60 ns	1.509 ns	69.77 ns	0.92
Old	Vector	3 31	71.66 ns	0.367 ns	71.69 ns	0.94
Simd	Vector	3 31	71.68 ns	0.275 ns	71.67 ns	0.94
Old	Scalar	3 rand	84.44 ns	1.170 ns	84.56 ns	1.00
Simd	Scalar	3 rand	73.85 ns	1.928 ns	73.09 ns	0.88
Old	Vector	3 rand	88.19 ns	2.006 ns	87.53 ns	1.05
Simd	Vector	3 rand	72.39 ns	0.361 ns	72.30 ns	0.86
Old	Scalar	8 31	90.91 ns	1.106 ns	90.98 ns	1.00
Simd	Scalar	8 31	74.83 ns	0.446 ns	74.79 ns	0.82
Old	Vector	8 31	92.18 ns	0.770 ns	92.16 ns	1.01
Simd	Vector	8 31	76.86 ns	2.110 ns	77.51 ns	0.83
Old	Scalar	8 rand	113.26 ns	1.413 ns	112.93 ns	1.00
Simd	Scalar	8 rand	89.38 ns	1.869 ns	90.17 ns	0.79
Old	Vector	8 rand	114.03 ns	1.009 ns	114.25 ns	1.01
Simd	Vector	8 rand	77.97 ns	0.398 ns	78.01 ns	0.69
Old	Scalar	16 31	117.61 ns	3.644 ns	117.00 ns	1.00
Simd	Scalar	16 31	93.51 ns	3.193 ns	93.18 ns	0.80
Old	Vector	16 31	126.25 ns	3.977 ns	124.28 ns	1.07
Simd	Vector	16 31	85.00 ns	1.931 ns	84.43 ns	0.72
Old	Scalar	16 rand	176.77 ns	0.664 ns	176.44 ns	1.00
Simd	Scalar	16 rand	113.33 ns	1.419 ns	113.69 ns	0.64
Old	Vector	16 rand	183.89 ns	4.498 ns	183.92 ns	1.03
Simd	Vector	16 rand	102.02 ns	2.704 ns	101.06 ns	0.58
Old	Scalar	31 31	175.91 ns	5.331 ns	174.43 ns	1.00
Simd	Scalar	31 31	172.84 ns	1.786 ns	172.41 ns	0.98
Old	Vector	31 31	184.64 ns	0.863 ns	184.60 ns	1.04
Simd	Vector	31 31	164.80 ns	3.119 ns	163.36 ns	0.93
Old	Scalar	31 rand	344.67 ns	1.361 ns	345.21 ns	1.00
Simd	Scalar	31 rand	229.80 ns	4.355 ns	231.57 ns	0.67
Old	Vector	31 rand	349.79 ns	10.634 ns	348.77 ns	1.04
Simd	Vector	31 rand	201.40 ns	2.266 ns	201.88 ns	0.58
Old	Scalar	64 31	283.75 ns	1.474 ns	283.66 ns	1.00
Simd	Scalar	64 31	238.76 ns	3.792 ns	238.53 ns	0.84
Old	Vector	64 31	307.43 ns	9.320 ns	308.81 ns	1.07
Simd	Vector	64 31	216.56 ns	4.559 ns	218.48 ns	0.76
Old	Scalar	64 rand	665.53 ns	6.890 ns	665.91 ns	1.00
Simd	Scalar	64 rand	314.14 ns	3.307 ns	313.13 ns	0.47
Old	Vector	64 rand	648.97 ns	12.764 ns	643.44 ns	0.98
Simd	Vector	64 rand	267.91 ns	2.130 ns	268.57 ns	0.40
Old	Scalar	4096 31	15,686.12 ns	375.212 ns	15,592.89 ns	1.00
Simd	Scalar	4096 31	7,471.90 ns	149.382 ns	7,545.45 ns	0.47
Old	Vector	4096 31	14,562.62 ns	178.600 ns	14,493.60 ns	0.91
Simd	Vector	4096 31	6,570.29 ns	155.094 ns	6,643.96 ns	0.42
Old	Scalar	4096 rand	35,522.87 ns	1,241.972 ns	35,233.65 ns	1.00
Simd	Scalar	4096 rand	15,208.18 ns	231.761 ns	15,181.23 ns	0.42
Old	Vector	4096 rand	35,025.25 ns	1,151.982 ns	34,802.99 ns	0.98
Simd	Vector	4096 rand	9,826.98 ns	255.002 ns	9,697.43 ns	0.27
Old	Scalar	4194304 31	20,924,322.58 ns	885,923.919 ns	20,725,096.88 ns	1.00
Simd	Scalar	4194304 31	8,891,290.06 ns	803,602.793 ns	8,789,537.50 ns	0.43
Old	Vector	4194304 31	18,723,995.76 ns	302,360.122 ns	18,699,326.56 ns	0.85
Simd	Vector	4194304 31	8,539,723.78 ns	939,235.097 ns	8,610,418.75 ns	0.41
Old	Scalar	4194304 rand	59,366,704.76 ns	1,862,838.139 ns	58,912,728.57 ns	1.00
Simd	Scalar	4194304 rand	17,214,168.34 ns	429,513.626 ns	17,287,740.62 ns	0.29
Old	Vector	4194304 rand	61,629,793.10 ns	1,789,614.370 ns	61,389,257.14 ns	1.04
Simd	Vector	4194304 rand	11,208,054.05 ns	686,486.722 ns	11,094,960.94 ns	0.19

long[] serialize benchmark report (x2 in .NET8, x2 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	65.14 ns	0.779 ns	65.05 ns	1.00
Simd	Scalar	0	67.13 ns	1.508 ns	67.85 ns	1.03
Old	Vector	0	60.80 ns	0.534 ns	60.76 ns	0.93
Simd	Vector	0	62.80 ns	2.018 ns	62.30 ns	0.97
Old	Scalar	1 127	67.11 ns	1.794 ns	67.05 ns	1.00
Simd	Scalar	1 127	71.27 ns	2.219 ns	70.98 ns	1.06
Old	Vector	1 127	69.55 ns	4.333 ns	68.52 ns	1.05
Simd	Vector	1 127	67.91 ns	2.616 ns	67.65 ns	1.01
Old	Scalar	1 rand	74.93 ns	3.566 ns	74.71 ns	1.00
Simd	Scalar	1 rand	70.71 ns	1.879 ns	71.02 ns	0.91
Old	Vector	1 rand	70.88 ns	1.408 ns	71.30 ns	0.91
Simd	Vector	1 rand	69.02 ns	1.387 ns	68.60 ns	0.89
Old	Scalar	3 127	80.69 ns	5.101 ns	80.02 ns	1.00
Simd	Scalar	3 127	73.55 ns	2.445 ns	73.38 ns	0.89
Old	Vector	3 127	79.06 ns	3.026 ns	79.39 ns	0.95
Simd	Vector	3 127	73.62 ns	2.682 ns	73.46 ns	0.89
Old	Scalar	3 rand	88.70 ns	4.579 ns	87.86 ns	1.00
Simd	Scalar	3 rand	74.69 ns	1.044 ns	74.86 ns	0.81
Old	Vector	3 rand	90.10 ns	4.138 ns	89.13 ns	1.01
Simd	Vector	3 rand	77.39 ns	1.371 ns	76.88 ns	0.85
Old	Scalar	8 127	105.12 ns	4.543 ns	105.03 ns	1.00
Simd	Scalar	8 127	90.91 ns	4.111 ns	89.69 ns	0.87
Old	Vector	8 127	109.71 ns	4.468 ns	108.55 ns	1.04
Simd	Vector	8 127	82.23 ns	1.997 ns	82.70 ns	0.77
Old	Scalar	8 rand	131.81 ns	4.521 ns	132.14 ns	1.00
Simd	Scalar	8 rand	89.71 ns	3.512 ns	88.82 ns	0.69
Old	Vector	8 rand	126.74 ns	2.146 ns	126.39 ns	0.97
Simd	Vector	8 rand	96.39 ns	3.122 ns	97.07 ns	0.73
Old	Scalar	16 -31	119.16 ns	5.211 ns	117.72 ns	1.00
Simd	Scalar	16 -31	101.12 ns	4.633 ns	99.75 ns	0.85
Old	Vector	16 -31	122.22 ns	2.948 ns	121.70 ns	1.05
Simd	Vector	16 -31	93.51 ns	2.921 ns	93.06 ns	0.79
Old	Scalar	16 rand	193.53 ns	5.188 ns	191.86 ns	1.00
Simd	Scalar	16 rand	111.37 ns	3.949 ns	110.87 ns	0.59
Old	Vector	16 rand	185.76 ns	3.899 ns	185.50 ns	0.96
Simd	Vector	16 rand	115.84 ns	2.542 ns	116.47 ns	0.60
Old	Scalar	31 -31	183.63 ns	4.232 ns	184.79 ns	1.00
Simd	Scalar	31 -31	210.11 ns	10.421 ns	209.24 ns	1.18
Old	Vector	31 -31	193.79 ns	6.432 ns	194.89 ns	1.06
Simd	Vector	31 -31	183.49 ns	1.166 ns	183.49 ns	1.00
Old	Scalar	31 rand	358.47 ns	11.899 ns	353.05 ns	1.00
Simd	Scalar	31 rand	214.19 ns	4.485 ns	215.47 ns	0.59
Old	Vector	31 rand	364.41 ns	9.719 ns	360.97 ns	1.01
Simd	Vector	31 rand	211.80 ns	1.099 ns	211.63 ns	0.58
Old	Scalar	64 -31	310.49 ns	14.622 ns	309.87 ns	1.00
Simd	Scalar	64 -31	293.84 ns	6.228 ns	292.89 ns	0.93
Old	Vector	64 -31	324.64 ns	12.090 ns	323.19 ns	1.03
Simd	Vector	64 -31	249.23 ns	8.075 ns	249.50 ns	0.79
Old	Scalar	64 rand	726.27 ns	31.170 ns	718.68 ns	1.00
Simd	Scalar	64 rand	329.11 ns	16.282 ns	325.52 ns	0.46
Old	Vector	64 rand	754.85 ns	28.949 ns	754.73 ns	1.04
Simd	Vector	64 rand	348.46 ns	24.205 ns	341.49 ns	0.48
Old	Scalar	4096 -16	15,945.08 ns	530.427 ns	16,127.85 ns	1.00
Simd	Scalar	4096 -16	10,063.09 ns	196.491 ns	9,986.64 ns	0.62
Old	Vector	4096 -16	16,260.18 ns	88.755 ns	16,286.49 ns	1.02
Simd	Vector	4096 -16	8,473.19 ns	36.542 ns	8,471.42 ns	0.53
Old	Scalar	4096 rand	58,967.96 ns	1,895.688 ns	59,177.31 ns	1.00
Simd	Scalar	4096 rand	24,257.35 ns	444.915 ns	24,158.14 ns	0.41
Old	Vector	4096 rand	58,805.08 ns	1,639.041 ns	58,303.19 ns	1.00
Simd	Vector	4096 rand	25,285.50 ns	537.606 ns	25,331.67 ns	0.43
Old	Scalar	4194304 9	26,224,884.01 ns	622,862.646 ns	26,163,120.31 ns	1.00
Simd	Scalar	4194304 9	15,105,698.04 ns	490,680.861 ns	15,231,606.25 ns	0.57
Old	Vector	4194304 9	29,538,393.29 ns	822,473.356 ns	29,384,978.12 ns	1.13
Simd	Vector	4194304 9	9,891,331.49 ns	122,261.393 ns	9,894,168.75 ns	0.37
Old	Scalar	4194304 rand	72,679,997.35 ns	1,981,812.668 ns	72,161,114.29 ns	1.00
Simd	Scalar	4194304 rand	30,349,787.27 ns	1,022,468.046 ns	29,938,098.44 ns	0.42
Old	Vector	4194304 rand	74,368,988.78 ns	1,237,589.060 ns	74,064,357.14 ns	1.01
Simd	Vector	4194304 rand	39,092,093.75 ns	1,107,437.984 ns	38,719,569.23 ns	0.54

float[] serialize benchmark report (x5 in .NET8, x2.5 in .NET6)

Method	Job	Size	Mean	StdDev	Median	Ratio
Old	Scalar	0	65.29 ns	1.106 ns	65.01 ns	1.00
Simd	Scalar	0	67.84 ns	1.488 ns	67.91 ns	1.04
Old	Vector	0	61.63 ns	0.807 ns	61.62 ns	0.94
Simd	Vector	0	62.74 ns	3.124 ns	61.61 ns	1.01
Old	Scalar	1	67.32 ns	1.429 ns	67.74 ns	1.00
Simd	Scalar	1	66.95 ns	1.394 ns	66.79 ns	1.00
Old	Vector	1	68.80 ns	2.337 ns	69.06 ns	1.05
Simd	Vector	1	68.21 ns	1.656 ns	68.60 ns	1.02
Old	Scalar	3	76.84 ns	1.506 ns	77.11 ns	1.00
Simd	Scalar	3	67.47 ns	1.463 ns	66.64 ns	0.88
Old	Vector	3	80.08 ns	1.519 ns	79.82 ns	1.04
Simd	Vector	3	67.39 ns	1.354 ns	66.80 ns	0.88
Old	Scalar	4	79.94 ns	1.249 ns	79.72 ns	1.00
Simd	Scalar	4	77.36 ns	1.578 ns	77.16 ns	0.97
Old	Vector	4	82.58 ns	3.076 ns	82.64 ns	1.06
Simd	Vector	4	73.17 ns	1.569 ns	73.62 ns	0.91
Old	Scalar	8	100.65 ns	4.886 ns	99.61 ns	1.00
Simd	Scalar	8	83.09 ns	7.510 ns	82.33 ns	0.84
Old	Vector	8	99.78 ns	3.235 ns	100.27 ns	0.97
Simd	Vector	8	72.96 ns	2.312 ns	72.49 ns	0.71
Old	Scalar	64	407.14 ns	9.051 ns	412.23 ns	1.00
Simd	Scalar	64	237.34 ns	4.365 ns	238.57 ns	0.58
Old	Vector	64	401.02 ns	14.873 ns	401.86 ns	1.00
Simd	Vector	64	161.22 ns	6.532 ns	159.18 ns	0.41
Old	Scalar	1024	5,354.95 ns	136.013 ns	5,275.91 ns	1.00
Simd	Scalar	1024	2,063.34 ns	32.061 ns	2,061.02 ns	0.38
Old	Vector	1024	5,418.25 ns	151.703 ns	5,321.56 ns	1.01
Simd	Vector	1024	982.35 ns	15.404 ns	981.75 ns	0.18
Old	Scalar	16777216	107,249,637.78 ns	2,142,287.091 ns	106,914,080.00 ns	1.00
Simd	Scalar	16777216	42,108,634.62 ns	389,497.133 ns	42,118,542.31 ns	0.39
Old	Vector	16777216	108,293,109.33 ns	1,545,091.859 ns	108,131,660.00 ns	1.01
Simd	Vector	16777216	20,572,228.12 ns	856,621.349 ns	20,202,537.50 ns	0.20

double[] serialize benchmark report (x5 in .NET8, x1.5 in .NET6)

Method	Job	Size	Mean	StdDev	Median	Ratio
Old	Scalar	0	63.02 ns	0.783 ns	62.88 ns	1.00
Simd	Scalar	0	64.00 ns	3.081 ns	62.90 ns	1.00
Old	Vector	0	68.16 ns	3.732 ns	68.14 ns	1.08
Simd	Vector	0	65.33 ns	3.648 ns	63.77 ns	1.10
Old	Scalar	1	71.29 ns	0.942 ns	71.25 ns	1.00
Simd	Scalar	1	71.02 ns	2.641 ns	70.12 ns	1.00
Old	Vector	1	70.21 ns	3.544 ns	70.66 ns	0.99
Simd	Vector	1	79.41 ns	1.521 ns	78.95 ns	1.11
Old	Scalar	3	84.85 ns	1.732 ns	84.93 ns	1.00
Simd	Scalar	3	77.41 ns	1.028 ns	77.49 ns	0.91
Old	Vector	3	83.16 ns	3.105 ns	83.12 ns	0.96
Simd	Vector	3	79.81 ns	4.371 ns	78.93 ns	0.99
Old	Scalar	8	104.12 ns	3.483 ns	104.40 ns	1.00
Simd	Scalar	8	91.48 ns	2.383 ns	91.26 ns	0.88
Old	Vector	8	104.90 ns	5.165 ns	104.05 ns	1.04
Simd	Vector	8	74.33 ns	1.724 ns	74.09 ns	0.72
Old	Scalar	31	294.80 ns	7.931 ns	291.04 ns	1.00
Simd	Scalar	31	217.60 ns	6.786 ns	217.12 ns	0.74
Old	Vector	31	297.14 ns	10.987 ns	296.20 ns	1.02
Simd	Vector	31	161.44 ns	11.067 ns	158.88 ns	0.55
Old	Scalar	64	549.67 ns	15.437 ns	541.92 ns	1.00
Simd	Scalar	64	320.96 ns	3.973 ns	318.95 ns	0.58
Old	Vector	64	518.35 ns	1.928 ns	517.71 ns	0.94
Simd	Vector	64	193.36 ns	14.968 ns	189.87 ns	0.36
Old	Scalar	1024	7,452.45 ns	72.863 ns	7,422.81 ns	1.00
Simd	Scalar	1024	3,573.68 ns	144.283 ns	3,498.03 ns	0.50
Old	Vector	1024	6,989.63 ns	329.541 ns	6,970.11 ns	0.98
Simd	Vector	1024	1,355.27 ns	60.143 ns	1,344.75 ns	0.18
Old	Scalar	16777216	145,684,971.79 ns	1,701,417.374 ns	144,984,033.33 ns	1.00
Simd	Scalar	16777216	64,169,903.06 ns	567,589.707 ns	64,013,157.14 ns	0.44
Old	Vector	16777216	143,560,861.67 ns	592,202.425 ns	143,690,375.00 ns	0.99
Simd	Vector	16777216	31,999,434.67 ns	718,275.640 ns	31,886,793.33 ns	0.22

bool[] deserialize benchmark report (x16~33 in .NET8, x1.4 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	25.75 ns	0.079 ns	25.75 ns	1.00
Simd	Scalar	0	27.06 ns	0.139 ns	27.03 ns	1.05
Old	Vector	0	22.55 ns	0.151 ns	22.53 ns	0.87
Simd	Vector	0	24.22 ns	0.283 ns	24.20 ns	0.94
Old	Scalar	1 false	34.80 ns	1.171 ns	34.51 ns	1.00
Simd	Scalar	1 false	89.14 ns	0.996 ns	88.75 ns	2.52
Old	Vector	1 false	32.52 ns	0.697 ns	32.28 ns	0.92
Simd	Vector	1 false	87.52 ns	1.975 ns	86.17 ns	2.49
Old	Scalar	1 rand	33.22 ns	0.523 ns	33.03 ns	1.00
Simd	Scalar	1 rand	88.22 ns	1.864 ns	88.64 ns	2.65
Old	Vector	1 rand	33.02 ns	0.516 ns	32.98 ns	0.99
Simd	Vector	1 rand	92.95 ns	1.808 ns	92.62 ns	2.80
Old	Scalar	1 true	32.80 ns	0.154 ns	32.80 ns	1.00
Simd	Scalar	1 true	90.92 ns	1.536 ns	90.92 ns	2.78
Old	Vector	1 true	33.37 ns	0.867 ns	32.98 ns	1.03
Simd	Vector	1 true	87.48 ns	1.394 ns	86.68 ns	2.67
Old	Scalar	3 false	39.15 ns	0.395 ns	39.08 ns	1.00
Simd	Scalar	3 false	89.26 ns	1.706 ns	88.51 ns	2.28
Old	Vector	3 false	38.24 ns	0.819 ns	37.79 ns	0.97
Simd	Vector	3 false	87.62 ns	0.393 ns	87.61 ns	2.24
Old	Scalar	3 rand	40.47 ns	0.984 ns	40.66 ns	1.00
Simd	Scalar	3 rand	89.56 ns	2.105 ns	88.76 ns	2.22
Old	Vector	3 rand	38.41 ns	0.196 ns	38.38 ns	0.96
Simd	Vector	3 rand	88.60 ns	1.938 ns	87.92 ns	2.20
Old	Scalar	3 true	39.53 ns	0.406 ns	39.44 ns	1.00
Simd	Scalar	3 true	88.69 ns	0.628 ns	88.49 ns	2.24
Old	Vector	3 true	38.65 ns	1.042 ns	38.07 ns	0.99
Simd	Vector	3 true	88.44 ns	0.763 ns	88.33 ns	2.24
Old	Scalar	8 rand	53.93 ns	0.743 ns	53.65 ns	1.00
Simd	Scalar	8 rand	93.95 ns	0.410 ns	93.90 ns	1.74
Old	Vector	8 rand	54.66 ns	1.374 ns	54.17 ns	1.02
Simd	Vector	8 rand	93.83 ns	0.992 ns	93.60 ns	1.74
Old	Scalar	16 rand	78.94 ns	2.150 ns	77.75 ns	1.00
Simd	Scalar	16 rand	108.15 ns	2.663 ns	108.91 ns	1.37
Old	Vector	16 rand	84.49 ns	1.136 ns	84.53 ns	1.07
Simd	Vector	16 rand	93.82 ns	1.916 ns	94.86 ns	1.19
Old	Scalar	31 rand	118.80 ns	0.553 ns	118.86 ns	1.00
Simd	Scalar	31 rand	123.83 ns	3.370 ns	122.92 ns	1.03
Old	Vector	31 rand	125.06 ns	3.864 ns	123.73 ns	1.05
Simd	Vector	31 rand	107.22 ns	2.077 ns	106.96 ns	0.90
Old	Scalar	64 rand	209.22 ns	1.002 ns	208.96 ns	1.00
Simd	Scalar	64 rand	156.62 ns	0.726 ns	156.72 ns	0.75
Old	Vector	64 rand	215.79 ns	5.461 ns	212.97 ns	1.03
Simd	Vector	64 rand	94.86 ns	0.498 ns	94.83 ns	0.45
Old	Scalar	4096 rand	23,111.92 ns	281.315 ns	23,146.40 ns	1.00
Simd	Scalar	4096 rand	15,517.09 ns	61.212 ns	15,505.02 ns	0.67
Old	Vector	4096 rand	27,138.43 ns	289.677 ns	27,133.66 ns	1.17
Simd	Vector	4096 rand	609.14 ns	25.750 ns	600.60 ns	0.03
Old	Scalar	4194304 rand	27,760,274.52 ns	168,809.463 ns	27,764,009.38 ns	1.00
Simd	Scalar	4194304 rand	17,409,503.79 ns	124,534.159 ns	17,380,539.06 ns	0.63
Old	Vector	4194304 rand	27,986,859.38 ns	237,050.588 ns	27,966,932.81 ns	1.01
Simd	Vector	4194304 rand	1,640,623.92 ns	11,880.757 ns	1,638,826.56 ns	0.06

bool[] serialize benchmark report (x10~50 in .NET8, x1.5 in .NET6)

Method	Job	Setting	Mean	StdDev	Ratio
Old	Scalar	0	66.09 ns	1.211 ns	1.00
Simd	Scalar	0	65.50 ns	1.037 ns	0.99
Old	Vector	0	67.17 ns	0.834 ns	1.02
Simd	Vector	0	61.21 ns	0.749 ns	0.93
Old	Scalar	1 false	65.33 ns	1.510 ns	1.00
Simd	Scalar	1 false	66.50 ns	0.837 ns	1.01
Old	Vector	1 false	67.33 ns	0.958 ns	1.03
Simd	Vector	1 false	65.64 ns	0.744 ns	1.00
Old	Scalar	1 rand	67.14 ns	1.156 ns	1.00
Simd	Scalar	1 rand	65.45 ns	0.275 ns	0.97
Old	Vector	1 rand	64.25 ns	0.766 ns	0.96
Simd	Vector	1 rand	68.19 ns	1.162 ns	1.02
Old	Scalar	1 true	64.37 ns	1.679 ns	1.00
Simd	Scalar	1 true	63.17 ns	0.795 ns	0.98
Old	Vector	1 true	64.01 ns	0.415 ns	1.00
Simd	Vector	1 true	63.61 ns	1.138 ns	0.99
Old	Scalar	3 false	72.83 ns	0.815 ns	1.00
Simd	Scalar	3 false	65.13 ns	1.238 ns	0.89
Old	Vector	3 false	74.07 ns	2.977 ns	1.01
Simd	Vector	3 false	66.03 ns	2.226 ns	0.89
Old	Scalar	3 rand	70.91 ns	1.365 ns	1.00
Simd	Scalar	3 rand	67.78 ns	2.794 ns	0.98
Old	Vector	3 rand	76.65 ns	2.856 ns	1.09
Simd	Vector	3 rand	66.17 ns	1.503 ns	0.93
Old	Scalar	3 true	72.37 ns	1.572 ns	1.00
Simd	Scalar	3 true	68.74 ns	1.494 ns	0.95
Old	Vector	3 true	71.01 ns	1.309 ns	0.98
Simd	Vector	3 true	64.31 ns	0.835 ns	0.89
Old	Scalar	8 rand	91.16 ns	3.229 ns	1.00
Simd	Scalar	8 rand	67.25 ns	0.322 ns	0.72
Old	Vector	8 rand	91.80 ns	1.789 ns	0.98
Simd	Vector	8 rand	77.76 ns	1.369 ns	0.83
Old	Scalar	16 rand	112.32 ns	1.439 ns	1.00
Simd	Scalar	16 rand	80.90 ns	0.899 ns	0.72
Old	Vector	16 rand	110.83 ns	0.413 ns	0.99
Simd	Vector	16 rand	66.99 ns	0.629 ns	0.60
Old	Scalar	31 rand	156.33 ns	1.040 ns	1.00
Simd	Scalar	31 rand	103.41 ns	1.167 ns	0.66
Old	Vector	31 rand	155.98 ns	3.542 ns	0.99
Simd	Vector	31 rand	83.68 ns	1.755 ns	0.53
Old	Scalar	64 rand	264.60 ns	6.322 ns	1.00
Simd	Scalar	64 rand	141.86 ns	2.149 ns	0.54
Old	Vector	64 rand	246.02 ns	1.221 ns	0.94
Simd	Vector	64 rand	73.41 ns	1.285 ns	0.28
Old	Scalar	4096 rand	25,193.17 ns	363.356 ns	1.00
Simd	Scalar	4096 rand	16,983.91 ns	331.965 ns	0.67
Old	Vector	4096 rand	26,103.29 ns	352.613 ns	1.04
Simd	Vector	4096 rand	515.27 ns	4.805 ns	0.02
Old	Scalar	4194304 rand	28,274,955.71 ns	333,932.626 ns	1.00
Simd	Scalar	4194304 rand	17,967,366.74 ns	69,513.126 ns	0.64
Old	Vector	4194304 rand	29,510,686.78 ns	218,391.697 ns	1.04
Simd	Vector	4194304 rand	1,882,470.01 ns	34,520.150 ns	0.07

short[] serialize benchmark report (x1.5~10 in .NET8, x2 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	64.61 ns	1.384 ns	64.13 ns	1.00
Simd	Scalar	0	64.61 ns	2.545 ns	64.15 ns	1.02
Old	Vector	0	70.11 ns	8.139 ns	67.58 ns	1.16
Simd	Vector	0	65.30 ns	1.888 ns	65.41 ns	1.02
Old	Scalar	1 -135	66.73 ns	1.463 ns	66.46 ns	1.00
Simd	Scalar	1 -135	68.50 ns	1.420 ns	68.59 ns	1.03
Old	Vector	1 -135	67.82 ns	2.208 ns	67.15 ns	1.02
Simd	Vector	1 -135	69.37 ns	3.218 ns	69.09 ns	1.04
Old	Scalar	1 127	70.01 ns	3.687 ns	69.53 ns	1.00
Simd	Scalar	1 127	66.38 ns	2.133 ns	65.78 ns	0.94
Old	Vector	1 127	68.21 ns	3.628 ns	68.24 ns	0.98
Simd	Vector	1 127	71.52 ns	2.750 ns	71.79 ns	1.02
Old	Scalar	1 rand	68.94 ns	2.990 ns	68.58 ns	1.00
Simd	Scalar	1 rand	64.38 ns	0.520 ns	64.24 ns	0.89
Old	Vector	1 rand	67.15 ns	2.866 ns	65.36 ns	0.98
Simd	Vector	1 rand	66.85 ns	1.006 ns	67.00 ns	0.92
Old	Scalar	16 -135	133.87 ns	1.937 ns	134.42 ns	1.00
Simd	Scalar	16 -135	95.07 ns	3.287 ns	94.19 ns	0.73
Old	Vector	16 -135	142.97 ns	5.428 ns	139.88 ns	1.09
Simd	Vector	16 -135	100.11 ns	3.995 ns	99.47 ns	0.78
Old	Scalar	16 127	138.99 ns	4.343 ns	137.01 ns	1.00
Simd	Scalar	16 127	112.29 ns	2.009 ns	112.56 ns	0.81
Old	Vector	16 127	134.17 ns	3.990 ns	135.04 ns	0.96
Simd	Vector	16 127	73.96 ns	1.730 ns	74.09 ns	0.54
Old	Scalar	16 rand	132.50 ns	4.174 ns	130.98 ns	1.00
Simd	Scalar	16 rand	100.34 ns	3.669 ns	99.47 ns	0.77
Old	Vector	16 rand	145.16 ns	3.897 ns	146.23 ns	1.09
Simd	Vector	16 rand	100.83 ns	1.811 ns	101.21 ns	0.76
Old	Scalar	3 -135	75.55 ns	2.722 ns	75.44 ns	1.00
Simd	Scalar	3 -135	73.09 ns	4.271 ns	72.35 ns	1.00
Old	Vector	3 -135	77.18 ns	2.631 ns	77.14 ns	1.02
Simd	Vector	3 -135	71.32 ns	2.325 ns	71.04 ns	0.95
Old	Scalar	3 127	78.22 ns	4.721 ns	77.05 ns	1.00
Simd	Scalar	3 127	75.36 ns	1.798 ns	75.42 ns	0.94
Old	Vector	3 127	79.17 ns	1.680 ns	79.16 ns	1.00
Simd	Vector	3 127	72.47 ns	1.114 ns	72.33 ns	0.93
Old	Scalar	3 rand	74.88 ns	1.746 ns	74.20 ns	1.00
Simd	Scalar	3 rand	69.90 ns	2.844 ns	69.62 ns	0.95
Old	Vector	3 rand	79.11 ns	1.322 ns	78.64 ns	1.06
Simd	Vector	3 rand	71.01 ns	1.411 ns	71.15 ns	0.95
Old	Scalar	31 -135	193.71 ns	4.543 ns	195.36 ns	1.00
Simd	Scalar	31 -135	120.04 ns	2.101 ns	119.40 ns	0.62
Old	Vector	31 -135	205.53 ns	4.701 ns	203.45 ns	1.06
Simd	Vector	31 -135	123.31 ns	0.545 ns	123.18 ns	0.63
Old	Scalar	8 -135	90.47 ns	1.790 ns	89.38 ns	1.00
Simd	Scalar	8 -135	78.54 ns	1.401 ns	78.03 ns	0.87
Old	Vector	8 -135	96.83 ns	2.601 ns	96.91 ns	1.06
Simd	Vector	8 -135	79.13 ns	1.795 ns	77.98 ns	0.88
Old	Scalar	8 127	101.69 ns	6.660 ns	99.46 ns	1.00
Simd	Scalar	8 127	96.09 ns	6.373 ns	94.53 ns	0.95
Old	Vector	8 127	102.99 ns	3.771 ns	102.01 ns	1.02
Simd	Vector	8 127	73.59 ns	2.666 ns	73.31 ns	0.73
Old	Scalar	8 rand	103.97 ns	3.321 ns	104.48 ns	1.00
Simd	Scalar	8 rand	82.86 ns	1.501 ns	82.59 ns	0.80
Old	Vector	8 rand	108.49 ns	3.400 ns	108.75 ns	1.05
Simd	Vector	8 rand	85.37 ns	3.038 ns	85.61 ns	0.82
Old	Scalar	31 127	210.06 ns	4.930 ns	213.30 ns	1.00
Simd	Scalar	31 127	148.37 ns	0.948 ns	148.15 ns	0.71
Old	Vector	31 127	211.06 ns	4.719 ns	209.58 ns	1.01
Simd	Vector	31 127	85.09 ns	1.971 ns	85.97 ns	0.41
Old	Scalar	31 rand	201.06 ns	6.534 ns	200.35 ns	1.00
Simd	Scalar	31 rand	133.03 ns	3.310 ns	132.84 ns	0.66
Old	Vector	31 rand	208.15 ns	1.368 ns	208.51 ns	1.04
Simd	Vector	31 rand	124.65 ns	2.458 ns	125.64 ns	0.62
Old	Scalar	64 -135	330.62 ns	8.218 ns	335.51 ns	1.00
Simd	Scalar	64 -135	176.57 ns	0.642 ns	176.71 ns	0.54
Old	Vector	64 -135	352.52 ns	8.173 ns	348.11 ns	1.07
Simd	Vector	64 -135	204.00 ns	4.785 ns	207.07 ns	0.62
Old	Scalar	64 127	360.84 ns	1.471 ns	361.17 ns	1.00
Simd	Scalar	64 127	229.14 ns	0.951 ns	229.16 ns	0.64
Old	Vector	64 127	338.87 ns	2.188 ns	339.29 ns	0.94
Simd	Vector	64 127	80.83 ns	1.626 ns	81.53 ns	0.22
Old	Scalar	64 rand	392.69 ns	10.484 ns	395.07 ns	1.00
Simd	Scalar	64 rand	196.38 ns	2.057 ns	196.30 ns	0.50
Old	Vector	64 rand	365.91 ns	2.169 ns	365.65 ns	0.94
Simd	Vector	64 rand	176.67 ns	2.038 ns	176.35 ns	0.45
Old	Scalar	4096 -135	20,294.82 ns	139.198 ns	20,258.78 ns	1.00
Simd	Scalar	4096 -135	8,079.11 ns	538.255 ns	7,962.02 ns	0.38
Old	Vector	4096 -135	21,663.18 ns	822.590 ns	21,590.36 ns	1.07
Simd	Vector	4096 -135	9,771.83 ns	333.494 ns	9,747.51 ns	0.48
Old	Scalar	4096 127	21,108.22 ns	451.334 ns	21,167.26 ns	1.00
Simd	Scalar	4096 127	12,481.15 ns	937.653 ns	12,099.64 ns	0.62
Old	Vector	4096 127	20,041.76 ns	429.274 ns	19,846.46 ns	0.95
Simd	Vector	4096 127	1,636.11 ns	11.117 ns	1,637.51 ns	0.08
Old	Scalar	4096 rand	37,403.94 ns	898.612 ns	37,031.23 ns	1.00
Simd	Scalar	4096 rand	19,484.87 ns	217.592 ns	19,387.52 ns	0.52
Old	Vector	4096 rand	37,422.98 ns	727.632 ns	37,567.51 ns	0.99
Simd	Vector	4096 rand	18,162.88 ns	166.710 ns	18,162.37 ns	0.48
Old	Scalar	4194304 -135	26,359,079.91 ns	161,380.166 ns	26,360,412.50 ns	1.00
Simd	Scalar	4194304 -135	8,687,431.90 ns	247,095.263 ns	8,571,582.81 ns	0.33
Old	Vector	4194304 -135	24,146,727.68 ns	150,344.737 ns	24,142,065.62 ns	0.92
Simd	Vector	4194304 -135	10,578,086.76 ns	214,830.668 ns	10,618,515.62 ns	0.40
Old	Scalar	4194304 127	22,197,904.02 ns	97,907.211 ns	22,207,804.69 ns	1.00
Simd	Scalar	4194304 127	12,562,917.63 ns	55,109.149 ns	12,575,878.12 ns	0.57
Old	Vector	4194304 127	20,752,435.94 ns	90,285.401 ns	20,746,096.88 ns	0.93
Simd	Vector	4194304 127	2,432,535.46 ns	25,094.285 ns	2,435,466.80 ns	0.11
Old	Scalar	4194304 rand	47,390,139.61 ns	253,250.702 ns	47,412,031.82 ns	1.00
Simd	Scalar	4194304 rand	23,302,391.46 ns	102,415.604 ns	23,294,990.62 ns	0.49
Old	Vector	4194304 rand	43,004,355.56 ns	129,764.309 ns	43,021,175.00 ns	0.91
Simd	Vector	4194304 rand	31,204,950.83 ns	98,126.218 ns	31,191,275.00 ns	0.66

ushort[] serialize benchmark report (x3~4 in .NET8, x2.5 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	72.25 ns	6.676 ns	69.45 ns	1.00
Simd	Scalar	0	67.48 ns	1.321 ns	67.91 ns	0.86
Old	Vector	0	68.35 ns	2.507 ns	67.92 ns	0.92
Simd	Vector	0	67.72 ns	2.586 ns	67.20 ns	0.92
Old	Scalar	1 127	72.67 ns	2.579 ns	72.78 ns	1.00
Simd	Scalar	1 127	70.72 ns	2.366 ns	70.33 ns	0.98
Old	Vector	1 127	75.06 ns	4.516 ns	74.69 ns	1.03
Simd	Vector	1 127	73.75 ns	9.467 ns	70.01 ns	1.03
Old	Scalar	1 rand	66.57 ns	0.274 ns	66.62 ns	1.00
Simd	Scalar	1 rand	67.67 ns	2.395 ns	67.18 ns	1.01
Old	Vector	1 rand	68.47 ns	2.058 ns	68.32 ns	1.02
Simd	Vector	1 rand	78.82 ns	12.966 ns	72.96 ns	1.27
Old	Scalar	3 127	74.12 ns	1.733 ns	73.47 ns	1.00
Simd	Scalar	3 127	66.34 ns	1.916 ns	66.00 ns	0.90
Old	Vector	3 127	73.32 ns	2.788 ns	72.28 ns	0.98
Simd	Vector	3 127	71.19 ns	3.357 ns	71.47 ns	1.00
Old	Scalar	3 rand	76.64 ns	1.334 ns	76.84 ns	1.00
Simd	Scalar	3 rand	72.47 ns	1.001 ns	72.53 ns	0.95
Old	Vector	3 rand	77.11 ns	0.947 ns	77.31 ns	1.01
Simd	Vector	3 rand	66.31 ns	0.342 ns	66.33 ns	0.87
Old	Scalar	8 127	90.91 ns	0.783 ns	91.18 ns	1.00
Simd	Scalar	8 127	78.09 ns	6.350 ns	76.05 ns	0.84
Old	Vector	8 127	93.89 ns	2.579 ns	94.00 ns	1.03
Simd	Vector	8 127	65.78 ns	0.799 ns	65.45 ns	0.72
Old	Scalar	8 rand	93.53 ns	3.722 ns	91.41 ns	1.00
Simd	Scalar	8 rand	79.16 ns	1.150 ns	79.60 ns	0.81
Old	Vector	8 rand	96.96 ns	3.195 ns	96.54 ns	1.03
Simd	Vector	8 rand	77.28 ns	1.772 ns	76.41 ns	0.80
Old	Scalar	16 127	118.20 ns	5.406 ns	116.01 ns	1.00
Simd	Scalar	16 127	86.47 ns	3.351 ns	86.39 ns	0.73
Old	Vector	16 127	113.57 ns	4.334 ns	112.24 ns	0.96
Simd	Vector	16 127	70.08 ns	3.060 ns	69.81 ns	0.59
Old	Scalar	16 rand	122.55 ns	0.340 ns	122.58 ns	1.00
Simd	Scalar	16 rand	99.52 ns	1.963 ns	100.42 ns	0.81
Old	Vector	16 rand	124.45 ns	1.813 ns	124.06 ns	1.02
Simd	Vector	16 rand	86.30 ns	2.890 ns	86.16 ns	0.71
Old	Scalar	31 127	167.72 ns	0.519 ns	167.72 ns	1.00
Simd	Scalar	31 127	99.77 ns	3.243 ns	98.32 ns	0.60
Old	Vector	31 127	162.53 ns	1.596 ns	162.27 ns	0.97
Simd	Vector	31 127	85.32 ns	3.011 ns	84.15 ns	0.52
Old	Scalar	31 rand	195.94 ns	1.191 ns	195.90 ns	1.00
Simd	Scalar	31 rand	131.22 ns	2.449 ns	131.46 ns	0.67
Old	Vector	31 rand	190.65 ns	4.240 ns	188.80 ns	0.98
Simd	Vector	31 rand	105.07 ns	1.833 ns	104.49 ns	0.54
Old	Scalar	64 127	282.00 ns	12.438 ns	281.36 ns	1.00
Simd	Scalar	64 127	147.68 ns	4.057 ns	149.42 ns	0.52
Old	Vector	64 127	258.36 ns	0.853 ns	258.02 ns	0.90
Simd	Vector	64 127	84.26 ns	3.025 ns	83.92 ns	0.29
Old	Scalar	64 rand	337.68 ns	23.001 ns	331.88 ns	1.00
Simd	Scalar	64 rand	198.89 ns	3.668 ns	199.08 ns	0.60
Old	Vector	64 rand	334.42 ns	14.122 ns	333.65 ns	0.99
Simd	Vector	64 rand	163.36 ns	4.242 ns	162.51 ns	0.48
Old	Scalar	4096 127	13,461.26 ns	304.231 ns	13,342.98 ns	1.00
Simd	Scalar	4096 127	5,066.30 ns	140.879 ns	5,067.29 ns	0.38
Old	Vector	4096 127	14,508.56 ns	413.951 ns	14,357.88 ns	1.09
Simd	Vector	4096 127	1,595.70 ns	15.924 ns	1,594.44 ns	0.12
Old	Scalar	4096 rand	18,181.25 ns	119.197 ns	18,167.88 ns	1.00
Simd	Scalar	4096 rand	7,862.37 ns	90.874 ns	7,878.42 ns	0.43
Old	Vector	4096 rand	17,981.42 ns	501.713 ns	17,740.45 ns	0.99
Simd	Vector	4096 rand	6,857.95 ns	220.758 ns	6,888.23 ns	0.38
Old	Scalar	4194304 127	14,398,654.57 ns	221,532.617 ns	14,320,076.56 ns	1.00
Simd	Scalar	4194304 127	5,391,375.36 ns	76,973.979 ns	5,402,529.69 ns	0.37
Old	Vector	4194304 127	14,705,850.22 ns	216,029.752 ns	14,642,123.44 ns	1.02
Simd	Vector	4194304 127	2,343,825.33 ns	33,388.728 ns	2,338,436.52 ns	0.16
Old	Scalar	4194304 rand	23,578,324.17 ns	154,616.629 ns	23,612,262.50 ns	1.00
Simd	Scalar	4194304 rand	9,899,772.66 ns	223,303.114 ns	9,960,557.03 ns	0.42
Old	Vector	4194304 rand	24,234,066.15 ns	140,033.602 ns	24,220,614.06 ns	1.03
Simd	Vector	4194304 rand	8,106,887.99 ns	250,208.136 ns	8,089,319.53 ns	0.35

int[] serialize benchmark report (x2~4 in .NET8, x1.2~2 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	72.38 ns	5.435 ns	72.92 ns	1.00
Simd	Scalar	0	64.82 ns	4.431 ns	63.62 ns	0.90
Old	Vector	0	62.19 ns	1.080 ns	61.59 ns	0.84
Simd	Vector	0	64.69 ns	1.430 ns	65.14 ns	0.86
Old	Scalar	1 0	68.79 ns	2.756 ns	68.55 ns	1.00
Simd	Scalar	1 0	68.44 ns	2.526 ns	68.32 ns	1.00
Old	Vector	1 0	69.85 ns	1.832 ns	70.53 ns	1.00
Simd	Vector	1 0	70.45 ns	1.247 ns	70.11 ns	1.02
Old	Scalar	1 rand	72.74 ns	1.546 ns	72.35 ns	1.00
Simd	Scalar	1 rand	68.27 ns	2.461 ns	68.33 ns	0.95
Old	Vector	1 rand	67.67 ns	0.419 ns	67.60 ns	0.93
Simd	Vector	1 rand	71.02 ns	1.608 ns	71.97 ns	0.98
Old	Scalar	3 0	72.58 ns	1.955 ns	73.53 ns	1.00
Simd	Scalar	3 0	72.20 ns	1.387 ns	72.52 ns	1.01
Old	Vector	3 0	74.33 ns	1.811 ns	74.53 ns	1.03
Simd	Vector	3 0	72.71 ns	0.652 ns	72.76 ns	1.02
Old	Scalar	3 rand	79.74 ns	1.254 ns	80.09 ns	1.00
Simd	Scalar	3 rand	70.37 ns	2.447 ns	69.56 ns	0.91
Old	Vector	3 rand	81.71 ns	2.313 ns	81.60 ns	1.03
Simd	Vector	3 rand	74.47 ns	2.084 ns	73.76 ns	0.94
Old	Scalar	8 0	88.73 ns	1.398 ns	88.19 ns	1.00
Simd	Scalar	8 0	87.15 ns	0.853 ns	87.21 ns	0.98
Old	Vector	8 0	92.26 ns	2.062 ns	93.42 ns	1.04
Simd	Vector	8 0	73.18 ns	1.596 ns	73.97 ns	0.82
Old	Scalar	8 rand	108.76 ns	1.834 ns	107.92 ns	1.00
Simd	Scalar	8 rand	79.58 ns	0.816 ns	79.77 ns	0.73
Old	Vector	8 rand	109.50 ns	2.334 ns	110.45 ns	1.01
Simd	Vector	8 rand	79.48 ns	2.630 ns	79.30 ns	0.75
Old	Scalar	16 0	123.26 ns	12.312 ns	119.60 ns	1.00
Simd	Scalar	16 0	123.52 ns	9.134 ns	120.87 ns	1.01
Old	Vector	16 0	118.29 ns	3.384 ns	118.66 ns	0.96
Simd	Vector	16 0	80.31 ns	4.121 ns	78.75 ns	0.66
Old	Scalar	16 rand	159.60 ns	3.899 ns	161.12 ns	1.00
Simd	Scalar	16 rand	99.43 ns	2.889 ns	98.46 ns	0.62
Old	Vector	16 rand	158.18 ns	3.358 ns	158.52 ns	0.99
Simd	Vector	16 rand	99.26 ns	3.292 ns	97.76 ns	0.63
Old	Scalar	31 0	174.78 ns	3.879 ns	176.60 ns	1.00
Simd	Scalar	31 0	159.41 ns	3.227 ns	160.91 ns	0.91
Old	Vector	31 0	170.26 ns	4.875 ns	166.97 ns	0.98
Simd	Vector	31 0	92.87 ns	2.644 ns	93.10 ns	0.53
Old	Scalar	31 rand	240.31 ns	0.475 ns	240.46 ns	1.00
Simd	Scalar	31 rand	132.35 ns	1.504 ns	132.72 ns	0.55
Old	Vector	31 rand	236.84 ns	4.784 ns	239.04 ns	0.98
Simd	Vector	31 rand	134.48 ns	3.111 ns	135.22 ns	0.56
Old	Scalar	64 0	270.40 ns	4.125 ns	269.25 ns	1.00
Simd	Scalar	64 0	310.60 ns	3.357 ns	312.37 ns	1.15
Old	Vector	64 0	265.18 ns	0.901 ns	265.20 ns	0.98
Simd	Vector	64 0	159.55 ns	4.250 ns	161.41 ns	0.58
Old	Scalar	64 rand	492.24 ns	9.885 ns	492.93 ns	1.00
Simd	Scalar	64 rand	260.77 ns	4.923 ns	258.70 ns	0.53
Old	Vector	64 rand	476.86 ns	8.921 ns	475.06 ns	0.97
Simd	Vector	64 rand	246.95 ns	1.821 ns	246.90 ns	0.50
Old	Scalar	4096 0	14,123.06 ns	198.615 ns	14,205.47 ns	1.00
Simd	Scalar	4096 0	12,711.88 ns	109.318 ns	12,722.09 ns	0.90
Old	Vector	4096 0	14,325.21 ns	78.716 ns	14,300.04 ns	1.02
Simd	Vector	4096 0	3,664.15 ns	207.046 ns	3,650.62 ns	0.26
Old	Scalar	4096 rand	43,052.00 ns	349.980 ns	43,013.18 ns	1.00
Simd	Scalar	4096 rand	20,884.08 ns	114.496 ns	20,913.20 ns	0.49
Old	Vector	4096 rand	43,162.41 ns	419.923 ns	43,254.36 ns	1.00
Simd	Vector	4096 rand	19,376.65 ns	229.895 ns	19,338.94 ns	0.45
Old	Scalar	4194304 0	16,461,541.04 ns	101,479.047 ns	16,462,490.62 ns	1.00
Simd	Scalar	4194304 0	13,420,517.41 ns	43,725.764 ns	13,419,034.38 ns	0.82
Old	Vector	4194304 0	17,115,307.08 ns	156,568.553 ns	17,096,718.75 ns	1.04
Simd	Vector	4194304 0	3,940,153.75 ns	31,870.350 ns	3,928,339.84 ns	0.24
Old	Scalar	4194304 rand	51,264,756.67 ns	224,423.250 ns	51,278,150.00 ns	1.00
Simd	Scalar	4194304 rand	23,920,772.29 ns	127,033.715 ns	23,891,815.62 ns	0.47
Old	Vector	4194304 rand	51,959,047.86 ns	390,922.613 ns	52,011,970.00 ns	1.01
Simd	Vector	4194304 rand	26,619,539.58 ns	173,648.010 ns	26,613,143.75 ns	0.52

uint[] serialize benchmark report (x5 in .NET8, x4 in .NET6)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	71.07 ns	6.917 ns	68.28 ns	1.00
Simd	Scalar	0	69.88 ns	5.860 ns	68.77 ns	0.99
Old	Vector	0	63.99 ns	4.202 ns	62.11 ns	0.91
Simd	Vector	0	60.27 ns	0.482 ns	60.22 ns	0.79
Old	Scalar	1 0	66.84 ns	1.444 ns	66.90 ns	1.00
Simd	Scalar	1 0	70.91 ns	6.931 ns	67.63 ns	1.00
Old	Vector	1 0	63.17 ns	1.176 ns	62.70 ns	0.94
Simd	Vector	1 0	68.49 ns	0.542 ns	68.32 ns	1.02
Old	Scalar	1 rand	75.20 ns	8.147 ns	72.24 ns	1.00
Simd	Scalar	1 rand	73.46 ns	4.012 ns	73.68 ns	0.99
Old	Vector	1 rand	71.14 ns	3.823 ns	69.74 ns	0.96
Simd	Vector	1 rand	66.40 ns	1.422 ns	67.02 ns	0.94
Old	Scalar	3 0	67.45 ns	0.252 ns	67.54 ns	1.00
Simd	Scalar	3 0	69.09 ns	3.504 ns	68.27 ns	1.07
Old	Vector	3 0	69.45 ns	0.428 ns	69.55 ns	1.03
Simd	Vector	3 0	73.13 ns	1.306 ns	73.53 ns	1.08
Old	Scalar	3 rand	80.54 ns	2.284 ns	80.12 ns	1.00
Simd	Scalar	3 rand	70.81 ns	0.901 ns	70.95 ns	0.88
Old	Vector	3 rand	79.26 ns	0.789 ns	79.47 ns	0.98
Simd	Vector	3 rand	71.62 ns	1.072 ns	71.16 ns	0.89
Old	Scalar	8 0	87.19 ns	2.646 ns	86.66 ns	1.00
Simd	Scalar	8 0	78.42 ns	0.720 ns	78.43 ns	0.89
Old	Vector	8 0	82.49 ns	0.339 ns	82.60 ns	0.94
Simd	Vector	8 0	72.35 ns	1.862 ns	73.20 ns	0.83
Old	Scalar	8 rand	101.42 ns	0.315 ns	101.30 ns	1.00
Simd	Scalar	8 rand	83.64 ns	1.793 ns	84.24 ns	0.82
Old	Vector	8 rand	116.78 ns	6.178 ns	117.01 ns	1.10
Simd	Vector	8 rand	80.52 ns	0.969 ns	80.25 ns	0.79
Old	Scalar	16 0	107.30 ns	2.669 ns	106.06 ns	1.00
Simd	Scalar	16 0	96.36 ns	1.868 ns	97.19 ns	0.90
Old	Vector	16 0	116.38 ns	10.049 ns	113.26 ns	1.02
Simd	Vector	16 0	86.86 ns	13.831 ns	81.24 ns	0.79
Old	Scalar	16 rand	162.54 ns	5.571 ns	162.74 ns	1.00
Simd	Scalar	16 rand	98.33 ns	1.316 ns	98.52 ns	0.60
Old	Vector	16 rand	159.31 ns	4.767 ns	161.31 ns	0.98
Simd	Vector	16 rand	92.31 ns	3.571 ns	91.41 ns	0.57
Old	Scalar	31 0	154.96 ns	1.814 ns	155.59 ns	1.00
Simd	Scalar	31 0	124.53 ns	7.176 ns	122.50 ns	0.82
Old	Vector	31 0	144.03 ns	0.559 ns	144.14 ns	0.93
Simd	Vector	31 0	92.44 ns	6.237 ns	90.81 ns	0.60
Old	Scalar	31 rand	290.31 ns	35.714 ns	281.16 ns	1.00
Simd	Scalar	31 rand	147.18 ns	9.028 ns	147.64 ns	0.51
Old	Vector	31 rand	255.14 ns	13.241 ns	249.52 ns	0.87
Simd	Vector	31 rand	129.02 ns	9.668 ns	125.85 ns	0.45
Old	Scalar	64 0	238.75 ns	0.787 ns	238.80 ns	1.00
Simd	Scalar	64 0	244.79 ns	0.884 ns	244.86 ns	1.02
Old	Vector	64 0	255.55 ns	13.088 ns	249.74 ns	1.06
Simd	Vector	64 0	153.95 ns	1.030 ns	154.02 ns	0.64
Old	Scalar	64 rand	623.41 ns	147.914 ns	555.81 ns	1.00
Simd	Scalar	64 rand	261.52 ns	13.738 ns	257.17 ns	0.45
Old	Vector	64 rand	475.65 ns	2.768 ns	476.25 ns	0.64
Simd	Vector	64 rand	235.19 ns	5.529 ns	237.97 ns	0.36
Old	Scalar	4096 0	12,902.83 ns	550.797 ns	12,852.14 ns	1.00
Simd	Scalar	4096 0	8,910.17 ns	377.737 ns	8,839.02 ns	0.69
Old	Vector	4096 0	13,878.94 ns	423.457 ns	13,852.32 ns	1.07
Simd	Vector	4096 0	3,206.65 ns	201.270 ns	3,136.82 ns	0.25
Old	Scalar	4096 rand	26,801.26 ns	500.940 ns	26,534.97 ns	1.00
Simd	Scalar	4096 rand	9,005.84 ns	81.284 ns	9,001.29 ns	0.34
Old	Vector	4096 rand	26,883.85 ns	679.605 ns	27,118.19 ns	1.00
Simd	Vector	4096 rand	8,033.06 ns	332.967 ns	7,966.49 ns	0.30
Old	Scalar	4194304 0	17,217,498.96 ns	439,483.873 ns	17,256,873.44 ns	1.00
Simd	Scalar	4194304 0	8,864,271.80 ns	209,480.653 ns	8,814,285.16 ns	0.52
Old	Vector	4194304 0	16,600,032.33 ns	187,641.176 ns	16,600,425.00 ns	0.96
Simd	Vector	4194304 0	3,669,334.41 ns	168,573.082 ns	3,610,645.70 ns	0.22
Old	Scalar	4194304 rand	38,645,037.10 ns	2,248,631.327 ns	37,898,330.00 ns	1.00
Simd	Scalar	4194304 rand	10,557,864.84 ns	419,185.002 ns	10,363,848.44 ns	0.27
Old	Vector	4194304 rand	36,893,078.57 ns	304,238.707 ns	36,926,864.29 ns	0.93
Simd	Vector	4194304 rand	8,403,770.52 ns	131,016.996 ns	8,446,523.44 ns	0.21

All benchmarks are done.
Except long[], all serialize method show very good performance.

[AArnott]

I will prepare a clean commit log Pull Request when you give the go-ahead.

I'll wait for this.

[pCYSl5EDgo]

I've rewrited formatters in C# 9 and moved them to in main MessagePack directory because this PR aims to improve default ArrayFormatters.

Unsafe.AsRef is silently changed from ref T AsRef<T> (scoped ref T source) to ref T AsRef<T> (scoped ref readonly T source). In .NET 8, it requires C#12.

I found this PR is dependent on #1734.

[pCYSl5EDgo]

This comment is written for later developers and describes why DateTimeArrayFormatter does not use SIMD.

DateTimeArrayFormatter is now added but this formatter does not utilize any SIMD functions at all since SIMD doesn't have any ability of integer div/mod operation.
In addition, until AVX512 (which can be used in Zen4 machine), there are api for no 64bit integer multiplication.

Reference SharpLab assembly code.

DateTime serialize without SIMD benchmark report (x2 in both)

Method	Job	Setting	Mean	StdDev	Median	Ratio
Old	Scalar	0	75.78 ns	7.245 ns	74.02 ns	1.00
Simd	Scalar	0	67.42 ns	2.760 ns	67.27 ns	0.88
Old	Vector	0	66.37 ns	4.844 ns	64.94 ns	0.88
Simd	Vector	0	63.57 ns	1.288 ns	63.37 ns	0.80
Old	Scalar	1 rand	75.78 ns	2.390 ns	75.85 ns	1.00
Simd	Scalar	1 rand	73.43 ns	3.087 ns	72.82 ns	0.97
Old	Vector	1 rand	75.10 ns	1.925 ns	74.83 ns	0.98
Simd	Vector	1 rand	95.68 ns	2.165 ns	95.50 ns	1.25
Old	Scalar	1 utc	74.75 ns	1.509 ns	75.14 ns	1.00
Simd	Scalar	1 utc	74.45 ns	1.426 ns	74.37 ns	1.00
Old	Vector	1 utc	70.76 ns	1.946 ns	69.86 ns	0.95
Simd	Vector	1 utc	71.09 ns	1.399 ns	70.95 ns	0.95
Old	Scalar	3 rand	141.65 ns	19.168 ns	140.26 ns	1.00
Simd	Scalar	3 rand	174.33 ns	11.602 ns	171.55 ns	1.24
Old	Vector	3 rand	139.78 ns	4.395 ns	139.68 ns	1.01
Simd	Vector	3 rand	148.41 ns	12.839 ns	144.56 ns	1.06
Old	Scalar	3 utc	102.32 ns	11.200 ns	97.79 ns	1.00
Simd	Scalar	3 utc	85.21 ns	5.066 ns	83.90 ns	0.84
Old	Vector	3 utc	95.13 ns	6.573 ns	93.21 ns	0.94
Simd	Vector	3 utc	81.06 ns	2.696 ns	81.77 ns	0.75
Old	Scalar	8 rand	264.54 ns	13.817 ns	259.70 ns	1.00
Simd	Scalar	8 rand	255.52 ns	9.032 ns	256.24 ns	0.95
Old	Vector	8 rand	258.59 ns	8.122 ns	259.58 ns	0.95
Simd	Vector	8 rand	182.73 ns	1.917 ns	182.52 ns	0.68
Old	Scalar	8 utc	131.87 ns	2.304 ns	131.94 ns	1.00
Simd	Scalar	8 utc	107.83 ns	2.043 ns	108.59 ns	0.82
Old	Vector	8 utc	146.33 ns	3.718 ns	147.20 ns	1.10
Simd	Vector	8 utc	106.37 ns	0.322 ns	106.37 ns	0.81
Old	Scalar	16 rand	379.41 ns	7.893 ns	379.08 ns	1.00
Simd	Scalar	16 rand	402.33 ns	14.135 ns	401.98 ns	1.06
Old	Vector	16 rand	452.44 ns	11.477 ns	448.50 ns	1.19
Simd	Vector	16 rand	336.69 ns	11.269 ns	334.30 ns	0.89
Old	Scalar	16 utc	214.99 ns	6.397 ns	212.61 ns	1.00
Simd	Scalar	16 utc	151.15 ns	4.020 ns	152.62 ns	0.70
Old	Vector	16 utc	270.33 ns	36.246 ns	256.22 ns	1.25
Simd	Vector	16 utc	157.51 ns	3.501 ns	156.49 ns	0.73
Old	Scalar	31 rand	719.14 ns	3.350 ns	718.38 ns	1.00
Simd	Scalar	31 rand	682.40 ns	6.484 ns	681.68 ns	0.95
Old	Vector	31 rand	804.97 ns	3.056 ns	804.61 ns	1.12
Simd	Vector	31 rand	778.17 ns	57.820 ns	765.90 ns	1.11
Old	Scalar	31 utc	419.78 ns	6.257 ns	417.69 ns	1.00
Simd	Scalar	31 utc	300.25 ns	14.616 ns	297.95 ns	0.76
Old	Vector	31 utc	449.02 ns	12.661 ns	450.35 ns	1.07
Simd	Vector	31 utc	307.18 ns	8.844 ns	304.63 ns	0.74
Old	Scalar	64 rand	1,705.32 ns	59.621 ns	1,681.02 ns	1.00
Simd	Scalar	64 rand	1,398.57 ns	29.381 ns	1,397.54 ns	0.81
Old	Vector	64 rand	1,696.00 ns	34.492 ns	1,683.47 ns	0.98
Simd	Vector	64 rand	1,077.99 ns	4.281 ns	1,078.17 ns	0.63
Old	Scalar	64 utc	809.06 ns	18.949 ns	815.92 ns	1.00
Simd	Scalar	64 utc	498.54 ns	21.903 ns	495.30 ns	0.63
Old	Vector	64 utc	886.79 ns	12.981 ns	888.45 ns	1.09
Simd	Vector	64 utc	564.98 ns	82.444 ns	533.36 ns	0.65
Old	Scalar	4096 rand	125,547.24 ns	1,213.114 ns	125,271.29 ns	1.00
Simd	Scalar	4096 rand	99,558.42 ns	1,035.725 ns	99,378.20 ns	0.79
Old	Vector	4096 rand	122,202.52 ns	631.395 ns	122,173.18 ns	0.97
Simd	Vector	4096 rand	100,926.67 ns	1,528.048 ns	100,785.58 ns	0.80
Old	Scalar	4096 utc	62,545.58 ns	721.018 ns	62,293.51 ns	1.00
Simd	Scalar	4096 utc	38,460.85 ns	1,240.379 ns	37,988.86 ns	0.63
Old	Vector	4096 utc	65,894.73 ns	795.250 ns	65,698.10 ns	1.05
Simd	Vector	4096 utc	35,719.59 ns	445.582 ns	35,522.50 ns	0.57
Old	Scalar	4194304 rand	141,690,505.77 ns	1,478,730.033 ns	141,738,825.00 ns	1.00
Simd	Scalar	4194304 rand	112,130,300.00 ns	1,334,293.852 ns	112,089,200.00 ns	0.79
Old	Vector	4194304 rand	141,831,608.33 ns	381,558.216 ns	141,931,612.50 ns	1.00
Simd	Vector	4194304 rand	113,438,212.00 ns	1,037,760.445 ns	113,063,760.00 ns	0.80
Old	Scalar	4194304 utc	86,847,380.92 ns	4,397,553.959 ns	84,739,441.67 ns	1.00
Simd	Scalar	4194304 utc	43,334,727.78 ns	867,568.775 ns	42,976,520.83 ns	0.50
Old	Vector	4194304 utc	87,281,693.71 ns	2,851,344.404 ns	86,920,320.00 ns	0.99
Simd	Vector	4194304 utc	44,852,673.57 ns	371,590.583 ns	44,774,720.00 ns	0.52

[AArnott]

@pCYSl5EDgo I haven't merged this as it's still marked Draft. I'm curious what your intention is for this PR going forward.

[pCYSl5EDgo]

@AArnott
I close this draft PR and will make another PR after #1734.
This draft PR's main purpose is to show performance improvements.