EgorBo

summary:
better: 293, geomean: 1.168
worse: 6, geomean: 1.097
total diff: 299

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Document.Tests.Perf_EnumerateArray.Parse(TestCase: ArrayOfNumbe |      1.28 |         15196.92 |         19394.85 |         |
| System.Text.Json.Reader.Tests.Perf_Base64.ReadBase64EncodedByteArray_NoEscaping( |      1.12 |            98.76 |           111.06 |         |
| System.Text.Json.Tests.Perf_Get.GetGuid                                          |      1.06 |          6085.42 |          6442.95 |         |

EgorBo

C:\prj\performance\src\tools\ResultsComparer>dotnet run --base C:\prj\arts\main-opt-JSON1\results --diff C:\prj\arts\egor-opt-JSON1\results --threshold 4%
summary:
better: 317, geomean: 1.214
worse: 2, geomean: 1.091
total diff: 319

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Reader.Tests.Perf_Base64.ReadBase64EncodedByteArray_NoEscaping( |      1.13 |            92.29 |           104.63 |         |
| System.Text.Json.Serialization.Tests.ReadJson<BinaryData>.DeserializeFromStream  |      1.05 |           839.65 |           880.73 |         |

EgorBo

summary:
better: 331, geomean: 1.334
worse: 1, geomean: 1.079
total diff: 332

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Reader.Tests.Perf_Base64.ReadBase64EncodedByteArray_NoEscaping( |      1.08 |            96.93 |           104.63 |         |

| Faster                                                                           | base/diff | Base Median (ns) | Diff Median (ns) | Modality|

EgorBo

better: 208, geomean: 1.124
worse: 15, geomean: 1.067
total diff: 223

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Tests.Utf8JsonReaderCommentsTests.Utf8JsonReaderCommentParsing( |      1.34 |          6295.70 |          8407.93 |         |
| System.Text.Json.Reader.Tests.Perf_Base64.ReadBase64EncodedByteArray_NoEscaping( |      1.19 |            92.78 |           110.15 |         |
| System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: True, TestCase |      1.08 |          8754.53 |          9414.43 |         |
| System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact |      1.06 |          2173.88 |          2308.44 |         |

EgorBo

PS C:\prj\runtime> ^C
PS C:\prj\runtime> python .\src\coreclr\scripts\superpmi.py asmdiffs
Warning: deleting existing log file C:\prj\runtime\artifacts\spmi\superpmi.log
================ Logging to C:\prj\runtime\artifacts\spmi\superpmi.log
Using JIT/EE Version from jiteeversionguid.h: 12234eca-dfc2-48bc-a320-6155cf25ce17
Baseline hash: 99740f1f531320f77401bb6e70aad0d89f70b6fb
Using baseline C:\prj\runtime\artifacts\spmi\basejit\deaaf6913922c936978e259e48e59a6eb6ac71a4.windows.x64.Checked\clrjit.dll
Using coredistools found at C:\prj\runtime\artifacts\tests\coreclr\windows.x64.Checked\Tests\Core_Root\coredistools.dll
Found download cache directory "C:\prj\runtime\artifacts\spmi\mch\12234eca-dfc2-48bc-a320-6155cf25ce17.windows.x64" and --force_download not set; skipping download
SuperPMI ASM diffs

EgorBo

using System;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;

public class Program
{
    [MethodImpl(MethodImplOptions.NoInlining)]
    public static void Main()
    {

EgorBo

build.cmd Clr+Libs -c Release
build.cmd Clr -c Checked
cd src\tests
build.cmd Release generatelayoutonly
cd ..\..
jit-diff diff --output C:\prj\jit-diffs --corelib --core_root C:\prj\runtime\artifacts\tests\coreclr\windows.x64.Release\Tests\Core_Root --base C:\prj\runtime\artifacts\bin\coreclr\windows.x64.Checked --pmi

# Now apply your change to corelib

# rebuild it:

EgorBo

using System;
using System.Diagnostics;
using System.IO;
using System.Reflection.Metadata;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;

public static class Program

EgorBo

****** START compiling ICSharpCode.Decompiler.TypeSystem.ArrayType:AcceptVisitor(ICSharpCode.Decompiler.TypeSystem.TypeVisitor):ICSharpCode.Decompiler.TypeSystem.IType:this (MethodHash=0ac853de)
Generating code for Windows x64
OPTIONS: Tier-1 compilation
OPTIONS: compCodeOpt = FAST_CODE
OPTIONS: compDbgCode = false
OPTIONS: compDbgInfo = true
OPTIONS: compDbgEnC  = false
OPTIONS: compProcedureSplitting   = false
OPTIONS: compProcedureSplittingEH = false
OPTIONS: optimized using profile data

EgorBo

using System;
using System.Runtime.InteropServices;

class Prog
{
    static unsafe void Main()
    {
        var func = (delegate* unmanaged<int, int, int>)GetProcAddress(GetModuleHandle("kernel32.dll"), "Beep");
        int result = func(500, 500);
    }