TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233

Closed
Bug
#127454
Closed
TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
Bug
#127454
Labels
area-System.Numerics.Tensors

Description

@vcsjones
vcsjones
opened on Feb 10, 2026

For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.

Consider the following example

usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);

This will print "1". ((255 + 2) % 256).

Another example, using a signed short

usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);

This will print -32767.

This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.

This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.

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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" + '

      Skip to content
      TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
      Closed
      Bug
      #127454
      Closed
      TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
      Bug
      #127454
      Labels
      area-System.Numerics.Tensors
      Description
      @vcsjones
      vcsjones
      opened on Feb 10, 2026
      For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
      Consider the following example
      usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
      This will print "1". ((255 + 2) % 256).
      Another example, using a signed short
      usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
      This will print -32767.
      This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
      This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
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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('^' + ".*" + '

          Skip to content
          TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
          Closed
          Bug
          #127454
          Closed
          TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
          Bug
          #127454
          Labels
          area-System.Numerics.Tensors
          Description
          @vcsjones
          vcsjones
          opened on Feb 10, 2026
          For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
          Consider the following example
          usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
          This will print "1". ((255 + 2) % 256).
          Another example, using a signed short
          usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
          This will print -32767.
          This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
          This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
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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
              TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
              Closed
              Bug
              #127454
              Closed
              TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
              Bug
              #127454
              Labels
              area-System.Numerics.Tensors
              Description
              @vcsjones
              vcsjones
              opened on Feb 10, 2026
              For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
              Consider the following example
              usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
              This will print "1". ((255 + 2) % 256).
              Another example, using a signed short
              usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
              This will print -32767.
              This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
              This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
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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
                  TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
                  Closed
                  Bug
                  #127454
                  Closed
                  TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
                  Bug
                  #127454
                  Labels
                  area-System.Numerics.Tensors
                  Description
                  @vcsjones
                  vcsjones
                  opened on Feb 10, 2026
                  For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
                  Consider the following example
                  usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                  This will print "1". ((255 + 2) % 256).
                  Another example, using a signed short
                  usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                  This will print -32767.
                  This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
                  This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
                  Metadata
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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('^' + ".*" + '

                      Skip to content
                      TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
                      Closed
                      Bug
                      #127454
                      Closed
                      TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
                      Bug
                      #127454
                      Labels
                      area-System.Numerics.Tensors
                      Description
                      @vcsjones
                      vcsjones
                      opened on Feb 10, 2026
                      For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
                      Consider the following example
                      usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                      This will print "1". ((255 + 2) % 256).
                      Another example, using a signed short
                      usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                      This will print -32767.
                      This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
                      This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
                      Metadata
                      Metadata
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                      No one assigned
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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
                          TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
                          Closed
                          Bug
                          #127454
                          Closed
                          TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
                          Bug
                          #127454
                          Labels
                          area-System.Numerics.Tensors
                          Description
                          @vcsjones
                          vcsjones
                          opened on Feb 10, 2026
                          For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
                          Consider the following example
                          usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                          This will print "1". ((255 + 2) % 256).
                          Another example, using a signed short
                          usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                          This will print -32767.
                          This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
                          This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
                          Metadata
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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
                              TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths #124233
                              Closed
                              Bug
                              #127454
                              Closed
                              TensorPrimitives.IndexOfMax produces incorrect results with vectorized paths#124233
                              Bug
                              #127454
                              Labels
                              area-System.Numerics.Tensors
                              Description
                              @vcsjones
                              vcsjones
                              opened on Feb 10, 2026
                              For TensorPrimitives.IndexOfMax<T> where the number of elements is larger that the largest value T can represent and can be vectorized, the incorrect index of can be calculated.
                              Consider the following example
                              usingSystem;usingSystem.Numerics.Tensors;byte[]data=newbyte[(int)byte.MaxValue+3];data[(int)byte.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                              This will print "1". ((255 + 2) % 256).
                              Another example, using a signed short
                              usingSystem;usingSystem.Numerics.Tensors;short[]data=newshort[(int)short.MaxValue+3];data[(int)short.MaxValue+2]=255;intresult=TensorPrimitives.IndexOfMax(data);Console.WriteLine(result);
                              This will print -32767.
                              This likely affects IndexOfMin, IndexOfMaxMagnitude, and IndexOfMinMagnitude since they share IndexOfMinMaxCore.
                              This also only impacts vectorized code paths. When .NET is forced to using scalar code paths using DOTNET_EnableHWIntrinsic=0, then the outputs are 257 and 32769, respectively.
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