[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787

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kotlarmilos:fix/mono-aot-crc32-nuint
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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
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kotlarmilos:fix/mono-aot-crc32-nuint

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Description

The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).

This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.

Fixes#127792

@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI review requested due to automatic review settings May 5, 2026 10:48
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Pull request overview

This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).

Changes:

  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.

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Sorry that I missed this!

Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

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/ba-g failures are present in the main and tracked in #127830

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/ba-g failures are present in the main and tracked in #127830

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kotlarmilos merged commit 1daec0a into dotnet:mainMay 11, 2026
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
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var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
Merged
kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
Merged
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
Copilot's findings
  • Files reviewed: 1/1 changed files
  • Comments generated: 0
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/ba-g failures are present in the main and tracked in #127830
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/ba-g failures are present in the main and tracked in #127830
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
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} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
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kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
Merged
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
Copilot's findings
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/ba-g failures are present in the main and tracked in #127830
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@BrzVladBrzVladBrzVlad approved these changes
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
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kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/ba-g failures are present in the main and tracked in #127830
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/ba-g failures are present in the main and tracked in #127830
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@BrzVladBrzVladBrzVlad approved these changes
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} 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
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
Merged
kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
Merged
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 5, 2026 10:48
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
Copilot's findings
  • Files reviewed: 1/1 changed files
  • Comments generated: 0
tannergooding
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/azp run runtime-extra-platforms
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  • Comments generated: 0 new
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/ba-g failures are present in the main and tracked in #127830
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/ba-g failures are present in the main and tracked in #127830
@kotlarmilos
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merged commit 1daec0a
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dotnet:mainMay 11, 2026

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Copilot left review comments
@BrzVladBrzVladBrzVlad approved these changes
@tannergoodingtannergoodingtannergooding approved these changes
@steveisoksteveisokAwaiting requested review from steveisoksteveisok is a code owner
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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@kotlarmilos@tannergooding@BrzVlad

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
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kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
Merged
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 5, 2026 10:48
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
Copilot's findings
  • Files reviewed: 1/1 changed files
  • Comments generated: 0
tannergooding
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/ba-g failures are present in the main and tracked in #127830
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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, 'i');
if (__m === '*' || __re.test(location.href)) {
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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
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kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
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kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/azp run runtime-extra-platforms
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Copilot's findings
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/ba-g failures are present in the main and tracked in #127830
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/ba-g failures are present in the main and tracked in #127830
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Copilot left review comments
@BrzVladBrzVladBrzVlad approved these changes
@tannergoodingtannergoodingtannergooding approved these changes
@steveisoksteveisokAwaiting requested review from steveisoksteveisok is a code owner
@vitek-karasvitek-karasAwaiting requested review from vitek-karasvitek-karas is a code owner

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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch - #127787
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kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
May 11, 2026
Merged
[mono] Handle nint/nuint in Crc32 and ArmBase intrinsic dispatch#127787
kotlarmilos merged 3 commits into
dotnet:mainfrom 
kotlarmilos:fix/mono-aot-crc32-nuint
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Description
The Mono SIMD intrinsic dispatch in simd-intrinsics.c did not match MONO_TYPE_I/U, so the new nint/nuint overloads added by #127327 (Crc32.ComputeCrc32(uint, nuint), Crc32.ComputeCrc32C(uint, nuint), ArmBase.ReverseElementBits(nint/nuint)) tripped g_assert_not_reached() at line 4981 during AOT of System.Private.CoreLib.dll on tvos-arm64 (build 1406826).
This unblocks AOT precompilation of System.Private.CoreLib.dll on 64-bit ARM Mono targets and recovers four tvos appletv work items (System.Configuration.ConfigurationManager.Tests, System.Reflection.MetadataLoadContext.Tests, System.Security.Cryptography.Xml.Tests, System.Text.Json.Tests) that previously exited 21 before any test ran.
Fixes#127792
@kotlarmilos
[mono][aot] Handle MONO_TYPE_I/U for Crc32 and ArmBase intrinsics
95c9862
PR dotnet#127327 added new nint/nuint overloads for System.Runtime.Intrinsics.Arm
(Crc32.ComputeCrc32(uint, nuint), ComputeCrc32C(uint, nuint), and
ArmBase.ReverseElementBits(nint/nuint)). The Mono SIMD intrinsic dispatch
in src/mono/mono/mini/simd-intrinsics.c only matched MONO_TYPE_U1/U2/U4/U8
and tripped g_assert_not_reached at line 4981 during AOT compilation of
System.Private.CoreLib.dll on tvos-arm64 (and any 64-bit ARM AOT target).
Changes:
- MONO_CPU_ARM64_CRC switch now maps MONO_TYPE_I/U to U4 or U8 by pointer
size and selects OP_XOP_I4_I4_I4 vs OP_XOP_I4_I4_I8 based on the actual
data type rather than the enclosing-class is_64bit flag (since the new
Crc32.ComputeCrc32(uint, nuint) overload lives on Crc32, not Crc32.Arm64).
- ArmBase.ReverseElementBits now keys op selection off arg0_i32 so the new
ArmBase.ReverseElementBits(nuint) overload picks the correct 32/64-bit
intrinsic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR fixes Mono ARM64 intrinsic dispatch for newly-added nint/nuint overloads by selecting the instruction/opcode based on the actual argument type (and pointer size), instead of relying on whether the method is in a nested *.Arm64 class. This prevents g_assert_not_reached() during AOT when compiling methods like Crc32.ComputeCrc32(uint, nuint) and ArmBase.ReverseElementBits(nint/nuint).
Changes:
  • Update ArmBase.ReverseElementBits dispatch to choose 32-bit vs 64-bit lowering based on the argument’s underlying type.
  • Update Crc32.ComputeCrc32/ComputeCrc32C dispatch to recognize MONO_TYPE_I/U and select CRC32W vs CRC32X lowering based on pointer size / operand width.
Show a summary per file
FileDescription
src/mono/mono/mini/simd-intrinsics.cFixes ARM64 intrinsic opcode selection for nint/nuint signatures to avoid AOT-time asserts and ensure correct 32/64-bit instruction choice.
Copilot's findings
  • Files reviewed: 1/1 changed files
  • Comments generated: 0
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Sorry that I missed this!
Had taken a glance and it had looked like it was generally supported since we already handled Vector128<nint> for the xplat APIs, missed that we had individual paths that needed to check for TYPE_I/U as well

This was referenced May 5, 2026

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/ba-g failures are present in the main and tracked in #127830
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/ba-g failures are present in the main and tracked in #127830
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@BrzVladBrzVladBrzVlad approved these changes
@tannergoodingtannergoodingtannergooding approved these changes
@steveisoksteveisokAwaiting requested review from steveisoksteveisok is a code owner
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Mono AOT compiler crashes on tvOS with assertion at simd-intrinsics.c:4981


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