Improve JIT loop optimizations (.NET 10) #108901

Description

@BruceForstall

We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

The corresponding .NET 9 issue is #93144.

Planned for .NET 10

Update loop inversion implementation

The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

Loop cloning

Multi-dimensional array improvements

Induction variable optimizations

Loop peeling

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User StoryA single user-facing feature. Can be grouped under an epic.area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
     blocks
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    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!';
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    codeBlock.parentElement.style.position = 'relative';
    codeBlock.parentElement.appendChild(btn);
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    addCopyButtons();
    // Re-run on dynamic content
    var observer = new MutationObserver(addCopyButtons);
    observer.observe(document.body, { childList: true, subtree: true });
    })();
    }
    } 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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    Improve JIT loop optimizations (.NET 10) #108901

    Description

    @BruceForstall

    We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

    Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

    The corresponding .NET 9 issue is #93144.

    Planned for .NET 10

    Update loop inversion implementation

    The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

    Loop cloning

    Multi-dimensional array improvements

    Induction variable optimizations

    Loop peeling

    Metadata

    Metadata

    Assignees

    Labels

    User StoryA single user-facing feature. Can be grouped under an epic.area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

    Type

    No type

    Projects

    No projects

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      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; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .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

      Improve JIT loop optimizations (.NET 10) #108901

      Description

      @BruceForstall

      We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

      Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

      The corresponding .NET 9 issue is #93144.

      Planned for .NET 10

      Update loop inversion implementation

      The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

      Loop cloning

      Multi-dimensional array improvements

      Induction variable optimizations

      Loop peeling

      Metadata

      Metadata

      Assignees

      Labels

      User StoryA single user-facing feature. Can be grouped under an epic.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('^' + ".*" + '
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        Improve JIT loop optimizations (.NET 10) #108901

        Description

        @BruceForstall

        We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

        Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

        The corresponding .NET 9 issue is #93144.

        Planned for .NET 10

        Update loop inversion implementation

        The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

        Loop cloning

        Multi-dimensional array improvements

        Induction variable optimizations

        Loop peeling

        Metadata

        Metadata

        Assignees

        Labels

        User StoryA single user-facing feature. Can be grouped under an epic.area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

        Type

        No type

        Projects

        No projects

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          None yet

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          No branches or pull requests

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          , '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" + '
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          Improve JIT loop optimizations (.NET 10) #108901

          Description

          @BruceForstall

          We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

          Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

          The corresponding .NET 9 issue is #93144.

          Planned for .NET 10

          Update loop inversion implementation

          The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

          Loop cloning

          Multi-dimensional array improvements

          Induction variable optimizations

          Loop peeling

          Metadata

          Metadata

          Assignees

          Labels

          User StoryA single user-facing feature. Can be grouped under an epic.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

            Improve JIT loop optimizations (.NET 10) #108901

            Description

            @BruceForstall

            We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

            Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

            The corresponding .NET 9 issue is #93144.

            Planned for .NET 10

            Update loop inversion implementation

            The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

            Loop cloning

            Multi-dimensional array improvements

            Induction variable optimizations

            Loop peeling

            Metadata

            Metadata

            Assignees

            Labels

            User StoryA single user-facing feature. Can be grouped under an epic.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

              Improve JIT loop optimizations (.NET 10) #108901

              Description

              @BruceForstall

              We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

              Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

              The corresponding .NET 9 issue is #93144.

              Planned for .NET 10

              Update loop inversion implementation

              The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

              Loop cloning

              Multi-dimensional array improvements

              Induction variable optimizations

              Loop peeling

              Metadata

              Metadata

              Assignees

              Labels

              User StoryA single user-facing feature. Can be grouped under an epic.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); } })(); })();
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                Improve JIT loop optimizations (.NET 10) #108901

                Description

                @BruceForstall

                We plan to continue improving JIT optimization capabilities for loop code. An overview of many JIT optimization possibilities is here; this issue will focus on issues we choose to address in .NET 10.

                Significant work was done in .NET 9; the list of work here for .NET 10 is much more modest.

                The corresponding .NET 9 issue is #93144.

                Planned for .NET 10

                Update loop inversion implementation

                The current loop inversion algorithm is lexical. Convert it to be graph based. This is part of the JIT flowgraph modernization push, and is tracked by #107749.

                Loop cloning

                Multi-dimensional array improvements

                Induction variable optimizations

                Loop peeling

                Metadata

                Metadata

                Assignees

                Labels

                User StoryA single user-facing feature. Can be grouped under an epic.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