Sub-optimal code generated for Unsafe.As #55064

Closed
#81454
Closed
Sub-optimal code generated for Unsafe.As#55064
#81454
Assignees
TIHan
Labels
area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
Milestone
8.0.0

Description

@hez2010
hez2010
opened on Jul 2, 2021

Description

usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));

JIT dump:

mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)

I think the ref can be omitted so that value won't be spilled to stack,
which is expected to be (on a little endian system):

movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)

Configuration

Version: .NET 6 preview 5
Tiered Compilation: off

category:cq
theme:codegen
skill-level:intermediate
cost:small
impact:medium

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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
    Sub-optimal code generated for Unsafe.As #55064
    Closed
    #81454
    Closed
    Sub-optimal code generated for Unsafe.As#55064
    #81454
    Assignees
    TIHan
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
    Milestone
    8.0.0
    Description
    @hez2010
    hez2010
    opened on Jul 2, 2021
    Description
    usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
    JIT dump:
    mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
    I think the ref can be omitted so that value won't be spilled to stack,
    
which is expected to be (on a little endian system):
    movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
    Configuration
    Version: .NET 6 preview 5
    
Tiered Compilation: off
    category:cq
    
theme:codegen
    
skill-level:intermediate
    
cost:small
    
impact:medium
    Metadata
    Metadata
    Assignees
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
    Type
    No type
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    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)) {
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
      Sub-optimal code generated for Unsafe.As #55064
      Closed
      #81454
      Closed
      Sub-optimal code generated for Unsafe.As#55064
      #81454
      Assignees
      TIHan
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
      Milestone
      8.0.0
      Description
      @hez2010
      hez2010
      opened on Jul 2, 2021
      Description
      usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
      JIT dump:
      mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
      I think the ref can be omitted so that value won't be spilled to stack,
      
which is expected to be (on a little endian system):
      movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
      Configuration
      Version: .NET 6 preview 5
      
Tiered Compilation: off
      category:cq
      
theme:codegen
      
skill-level:intermediate
      
cost:small
      
impact:medium
      Metadata
      Metadata
      Assignees
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
      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)) {
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
        Sub-optimal code generated for Unsafe.As #55064
        Closed
        #81454
        Closed
        Sub-optimal code generated for Unsafe.As#55064
        #81454
        Assignees
        TIHan
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
        Milestone
        8.0.0
        Description
        @hez2010
        hez2010
        opened on Jul 2, 2021
        Description
        usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
        JIT dump:
        mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
        I think the ref can be omitted so that value won't be spilled to stack,
        
which is expected to be (on a little endian system):
        movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
        Configuration
        Version: .NET 6 preview 5
        
Tiered Compilation: off
        category:cq
        
theme:codegen
        
skill-level:intermediate
        
cost:small
        
impact:medium
        Metadata
        Metadata
        Assignees
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
        Type
        No type
        Projects
        No projects
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          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, '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
          Sub-optimal code generated for Unsafe.As #55064
          Closed
          #81454
          Closed
          Sub-optimal code generated for Unsafe.As#55064
          #81454
          Assignees
          TIHan
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
          Milestone
          8.0.0
          Description
          @hez2010
          hez2010
          opened on Jul 2, 2021
          Description
          usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
          JIT dump:
          mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
          I think the ref can be omitted so that value won't be spilled to stack,
          
which is expected to be (on a little endian system):
          movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
          Configuration
          Version: .NET 6 preview 5
          
Tiered Compilation: off
          category:cq
          
theme:codegen
          
skill-level:intermediate
          
cost:small
          
impact:medium
          Metadata
          Metadata
          Assignees
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
          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)) {
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
            Sub-optimal code generated for Unsafe.As #55064
            Closed
            #81454
            Closed
            Sub-optimal code generated for Unsafe.As#55064
            #81454
            Assignees
            TIHan
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
            Milestone
            8.0.0
            Description
            @hez2010
            hez2010
            opened on Jul 2, 2021
            Description
            usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
            JIT dump:
            mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
            I think the ref can be omitted so that value won't be spilled to stack,
            
which is expected to be (on a little endian system):
            movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
            Configuration
            Version: .NET 6 preview 5
            
Tiered Compilation: off
            category:cq
            
theme:codegen
            
skill-level:intermediate
            
cost:small
            
impact:medium
            Metadata
            Metadata
            Assignees
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
            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)) {
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
              Sub-optimal code generated for Unsafe.As #55064
              Closed
              #81454
              Closed
              Sub-optimal code generated for Unsafe.As#55064
              #81454
              Assignees
              TIHan
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
              Milestone
              8.0.0
              Description
              @hez2010
              hez2010
              opened on Jul 2, 2021
              Description
              usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
              JIT dump:
              mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
              I think the ref can be omitted so that value won't be spilled to stack,
              
which is expected to be (on a little endian system):
              movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
              Configuration
              Version: .NET 6 preview 5
              
Tiered Compilation: off
              category:cq
              
theme:codegen
              
skill-level:intermediate
              
cost:small
              
impact:medium
              Metadata
              Metadata
              Assignees
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
              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)) {
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
                Sub-optimal code generated for Unsafe.As #55064
                Closed
                #81454
                Closed
                Sub-optimal code generated for Unsafe.As#55064
                #81454
                Assignees
                TIHan
                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
                Milestone
                8.0.0
                Description
                @hez2010
                hez2010
                opened on Jul 2, 2021
                Description
                usingSystem.Runtime.CompilerServices;[MethodImpl(MethodImplOptions.AggressiveInlining)]byteCreate<T>(Tvalue){returnUnsafe.As<T,byte>(refvalue);}Console.WriteLine(Create(500));Console.WriteLine(Create(500L));
                JIT dump:
                mov dword ptr [rsp+0x44],0x1f4movzxecx, byte ptr [rsp+0x44]call System.Console.WriteLine(Int32)mov qword ptr [rsp+0x38],0x1f4movzxecx, byte ptr [rsp+0x38]call System.Console.WriteLine(Int32)
                I think the ref can be omitted so that value won't be spilled to stack,
                
which is expected to be (on a little endian system):
                movecx,0xf4call System.Console.WriteLine(Int32)movecx,0xf4call System.Console.WriteLine(Int32)
                Configuration
                Version: .NET 6 preview 5
                
Tiered Compilation: off
                category:cq
                
theme:codegen
                
skill-level:intermediate
                
cost:small
                
impact:medium
                Metadata
                Metadata
                Assignees
                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMItenet-performancePerformance related issue
                Type
                No type
                Projects
                No projects
                  Milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions