Avx2 code causes AccessViolationExceptions with AVX512 available #92357

Closed
Closed
Avx2 code causes AccessViolationExceptions with AVX512 available#92357
Assignees
tannergooding
Labels
area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
Milestone
8.0.0

Description

@TechPizzaDev
TechPizzaDev
opened on Sep 20, 2023

Description

Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.

Reproduction Steps

  1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
  2. Checkout branch net8-upgrade
  3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
  4. Run project in Release mode to crash (works in Debug mode)

Expected behavior

No crash.

Actual behavior

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

Regression?

Regression in net8, worked on net7 and net6.

Known Workarounds

Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.

Configuration

.NET: 8.0.0-rc.1.23419.4
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
Arch: x64

Other information

There seems to be a single codegen difference:

 C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0

DOTNET_EnableAVX512F=0: working disasm.txt
DOTNET_EnableAVX512F=1: broken disasm.txt

Metadata

Metadata

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Labels

area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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No projects

    Milestone

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    None yet

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    No branches or pull requests

    Issue actions

    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
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btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
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codeBlock.parentElement.style.position = 'relative';
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var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    Avx2 code causes AccessViolationExceptions with AVX512 available #92357
    Closed
    Closed
    Avx2 code causes AccessViolationExceptions with AVX512 available#92357
    Assignees
    tannergooding
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    Milestone
    8.0.0
    Description
    @TechPizzaDev
    TechPizzaDev
    opened on Sep 20, 2023
    Description
    Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
    Reproduction Steps
    1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
    2. Checkout branch net8-upgrade
    3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
    4. Run project in Release mode to crash (works in Debug mode)
    Expected behavior
    No crash.
    Actual behavior
    Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

    Regression?
    Regression in net8, worked on net7 and net6.
    Known Workarounds
    Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
    Configuration
    .NET: 8.0.0-rc.1.23419.4
    
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
    
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
    
Arch: x64
    Other information
    There seems to be a single codegen difference:
     C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
    DOTNET_EnableAVX512F=0: working disasm.txt
    DOTNET_EnableAVX512F=1: broken disasm.txt
    Metadata
    Metadata
    Assignees
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    Type
    No type
    Projects
    No projects
      Milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
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.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      Avx2 code causes AccessViolationExceptions with AVX512 available #92357
      Closed
      Closed
      Avx2 code causes AccessViolationExceptions with AVX512 available#92357
      Assignees
      tannergooding
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
      Milestone
      8.0.0
      Description
      @TechPizzaDev
      TechPizzaDev
      opened on Sep 20, 2023
      Description
      Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
      Reproduction Steps
      1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
      2. Checkout branch net8-upgrade
      3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
      4. Run project in Release mode to crash (works in Debug mode)
      Expected behavior
      No crash.
      Actual behavior
      Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

      Regression?
      Regression in net8, worked on net7 and net6.
      Known Workarounds
      Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
      Configuration
      .NET: 8.0.0-rc.1.23419.4
      
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
      
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
      
Arch: x64
      Other information
      There seems to be a single codegen difference:
       C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
      DOTNET_EnableAVX512F=0: working disasm.txt
      DOTNET_EnableAVX512F=1: broken disasm.txt
      Metadata
      Metadata
      Assignees
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
      Type
      No type
      Projects
      No projects
        Milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        Avx2 code causes AccessViolationExceptions with AVX512 available #92357
        Closed
        Closed
        Avx2 code causes AccessViolationExceptions with AVX512 available#92357
        Assignees
        tannergooding
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
        Milestone
        8.0.0
        Description
        @TechPizzaDev
        TechPizzaDev
        opened on Sep 20, 2023
        Description
        Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
        Reproduction Steps
        1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
        2. Checkout branch net8-upgrade
        3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
        4. Run project in Release mode to crash (works in Debug mode)
        Expected behavior
        No crash.
        Actual behavior
        Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

        Regression?
        Regression in net8, worked on net7 and net6.
        Known Workarounds
        Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
        Configuration
        .NET: 8.0.0-rc.1.23419.4
        
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
        
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
        
Arch: x64
        Other information
        There seems to be a single codegen difference:
         C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
        DOTNET_EnableAVX512F=0: working disasm.txt
        DOTNET_EnableAVX512F=1: broken disasm.txt
        Metadata
        Metadata
        Assignees
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
        Type
        No type
        Projects
        No projects
          Milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          Avx2 code causes AccessViolationExceptions with AVX512 available #92357
          Closed
          Closed
          Avx2 code causes AccessViolationExceptions with AVX512 available#92357
          Assignees
          tannergooding
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
          Milestone
          8.0.0
          Description
          @TechPizzaDev
          TechPizzaDev
          opened on Sep 20, 2023
          Description
          Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
          Reproduction Steps
          1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
          2. Checkout branch net8-upgrade
          3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
          4. Run project in Release mode to crash (works in Debug mode)
          Expected behavior
          No crash.
          Actual behavior
          Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

          Regression?
          Regression in net8, worked on net7 and net6.
          Known Workarounds
          Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
          Configuration
          .NET: 8.0.0-rc.1.23419.4
          
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
          
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
          
Arch: x64
          Other information
          There seems to be a single codegen difference:
           C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
          DOTNET_EnableAVX512F=0: working disasm.txt
          DOTNET_EnableAVX512F=1: broken disasm.txt
          Metadata
          Metadata
          Assignees
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
          Type
          No type
          Projects
          No projects
            Milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            Avx2 code causes AccessViolationExceptions with AVX512 available #92357
            Closed
            Closed
            Avx2 code causes AccessViolationExceptions with AVX512 available#92357
            Assignees
            tannergooding
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
            Milestone
            8.0.0
            Description
            @TechPizzaDev
            TechPizzaDev
            opened on Sep 20, 2023
            Description
            Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
            Reproduction Steps
            1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
            2. Checkout branch net8-upgrade
            3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
            4. Run project in Release mode to crash (works in Debug mode)
            Expected behavior
            No crash.
            Actual behavior
            Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

            Regression?
            Regression in net8, worked on net7 and net6.
            Known Workarounds
            Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
            Configuration
            .NET: 8.0.0-rc.1.23419.4
            
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
            
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
            
Arch: x64
            Other information
            There seems to be a single codegen difference:
             C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
            DOTNET_EnableAVX512F=0: working disasm.txt
            DOTNET_EnableAVX512F=1: broken disasm.txt
            Metadata
            Metadata
            Assignees
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
            Type
            No type
            Projects
            No projects
              Milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Avx2 code causes AccessViolationExceptions with AVX512 available #92357
              Closed
              Closed
              Avx2 code causes AccessViolationExceptions with AVX512 available#92357
              Assignees
              tannergooding
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
              Milestone
              8.0.0
              Description
              @TechPizzaDev
              TechPizzaDev
              opened on Sep 20, 2023
              Description
              Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
              Reproduction Steps
              1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
              2. Checkout branch net8-upgrade
              3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
              4. Run project in Release mode to crash (works in Debug mode)
              Expected behavior
              No crash.
              Actual behavior
              Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

              Regression?
              Regression in net8, worked on net7 and net6.
              Known Workarounds
              Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
              Configuration
              .NET: 8.0.0-rc.1.23419.4
              
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
              
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
              
Arch: x64
              Other information
              There seems to be a single codegen difference:
               C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
              DOTNET_EnableAVX512F=0: working disasm.txt
              DOTNET_EnableAVX512F=1: broken disasm.txt
              Metadata
              Metadata
              Assignees
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
              Type
              No type
              Projects
              No projects
                Milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                Avx2 code causes AccessViolationExceptions with AVX512 available #92357
                Closed
                Closed
                Avx2 code causes AccessViolationExceptions with AVX512 available#92357
                Assignees
                tannergooding
                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
                Milestone
                8.0.0
                Description
                @TechPizzaDev
                TechPizzaDev
                opened on Sep 20, 2023
                Description
                Avx2 code seems to throw unexpected AccessViolations when AVX512 is available.
                Reproduction Steps
                1. Clone repo https://github.com/TechPizzaDev/SoftwareRasterizer
                2. Checkout branch net8-upgrade
                3. Download Castle folder from https://github.com/rawrunprotected/rasterizer/tree/master/SoftwareRasterizer and put next to built SoftwareRasterizer.exe
                4. Run project in Release mode to crash (works in Debug mode)
                Expected behavior
                No crash.
                Actual behavior
                Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterizeLoop(UInt32, UInt16*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Int32>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, System.Runtime.Intrinsics.Vector128`1<Single>*, UInt32*, UInt32*, UInt32*, UInt32*, Boolean)
at SoftwareRasterizer.Avx2Rasterizer`1[[SoftwareRasterizer.FmaX86, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].rasterize[[SoftwareRasterizer.Rasterizer+NearClipped, SoftwareRasterizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]](SoftwareRasterizer.Occluder ByRef)
at SoftwareRasterizer.Main.WndProc(TerraFX.Interop.Windows.HWND, UInt32, TerraFX.Interop.Windows.WPARAM, TerraFX.Interop.Windows.LPARAM)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at TerraFX.Interop.Windows.Windows.UpdateWindow(TerraFX.Interop.Windows.HWND)
at SoftwareRasterizer.Main.wWinMain(TerraFX.Interop.Windows.HINSTANCE)
at SoftwareRasterizer.Program.Main(System.String[])

                Regression?
                Regression in net8, worked on net7 and net6.
                Known Workarounds
                Setting DOTNET_EnableAVX512F=0 makes it work as expected in Release mode. The project also works in Debug mode.
                Configuration
                .NET: 8.0.0-rc.1.23419.4
                
OS: Microsoft Windows 11 Home (10.0.22621 version 22621)
                
CPU: 11th Gen Intel(R) Core(TM) i3-1115G4 @ 3.00GHz
                
Arch: x64
                Other information
                There seems to be a single codegen difference:
                 C4E2793DC1 vpmaxsd xmm0, xmm0, xmm1
- C4E2793905EC070000 vpminsd xmm0, xmm0, xmmword ptr [reloc @RWD80] # DOTNET_EnableAVX512F=0+ 62F27D183905EB070000 vpminsd xmm0, xmm0, dword ptr [reloc @RWD80] {1to4} # DOTNET_EnableAVX512F=1
C5F8298590FCFFFF vmovaps xmmword ptr [rbp-0x370], xmm0
                DOTNET_EnableAVX512F=0: working disasm.txt
                DOTNET_EnableAVX512F=1: broken disasm.txt
                Metadata
                Metadata
                Assignees
                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
                Type
                No type
                Projects
                No projects
                  Milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions