[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
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Backport of #126645 to release/10.0

/cc @jakobbotsch

Customer Impact

  • Customer reported
  • Found internally

The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.

Regression

  • Yes
  • No

The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.

Testing

Unit test added.

Risk

Low. Tighten the utility function that determines reordering legality.

@github-actionsgithub-actionsBot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Apr 15, 2026
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JulieLeeMSFT merged commit 276c5b9 into release/10.0Apr 16, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
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JulieLeeMSFT merged 4 commits into
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backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
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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");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
Merged
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
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Apr 15, 2026•

edited by jakobbotsch

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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
@github-actionsgithub-actionsBot
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merged commit 276c5b9
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backport/pr-126645-to-release/10.0

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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('^' + ".*" + '

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
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release/10.0from 
backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
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edited by jakobbotsch

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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
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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" + '

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
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backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
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backport/pr-126645-to-release/10.0
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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
@github-actionsgithub-actionsBot
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, '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('^' + ".*" + '

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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
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[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
Merged
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
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Apr 15, 2026•

edited by jakobbotsch

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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
@github-actionsgithub-actionsBot
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merged commit 276c5b9
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119 of 124 checks passed

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deleted the

backport/pr-126645-to-release/10.0

branch
April 16, 2026 01:26
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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); }
})();
})();

Skip to content
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode - #126939
Merged
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
Apr 16, 2026
Merged
[release/10.0] JIT: Handle writes to promoted locals in AliasSet::AddNode#126939
JulieLeeMSFT merged 4 commits into
release/10.0from 
backport/pr-126645-to-release/10.0
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commented
Apr 15, 2026•

edited by jakobbotsch

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Backport of #126645 to release/10.0
/cc @jakobbotsch
Customer Impact
  •  Customer reported
  •  Found internally
The JIT may incorrectly reorder two stores in a way that results in computing a wrong result. This was observed on arm64 during its optimization that tries to combine adjacent stores, but the bug is in a common helper function and can potentially be hit on all targets. Reported by customer in #126414.
Regression
  •  Yes
  •  No
The bug is in a common helper function, but the arm64 adjacent store optimization that exposed it was introduced in .NET 10.
Testing
Unit test added.
Risk
Low. Tighten the utility function that determines reordering legality.
@github-actionsgithub-actionsBot
added
the 
area-CodeGen-coreclr
CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
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merged commit 276c5b9
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119 of 124 checks passed

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backport/pr-126645-to-release/10.0

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