Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338

Closed
#89339
Closed
Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
#89339
Assignees
tannergooding
Labels
area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
Milestone
8.0.0

Description

@dubiousconst282
dubiousconst282
opened on Jul 22, 2023

Description

When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.

This problem appears to be specific to this operator, the others (and the static functions) are working properly.

Reproduction Steps

usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}

Expected behavior

JIT should emit the correct instruction operand.

Actual behavior

JIT emits an incorrect instruction operand:

; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27

Regression?

No response

Known Workarounds

Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.

Configuration

.NET SDK:
Version: 8.0.100-preview.6.23330.14
Commit: ba97796b8f

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22621

Other information

No response

Metadata

Metadata

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area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture

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    , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} 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
    Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
    Closed
    #89339
    Closed
    Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
    #89339
    Assignees
    tannergooding
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
    Milestone
    8.0.0
    Description
    @dubiousconst282
    dubiousconst282
    opened on Jul 22, 2023
    Description
    When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
    This problem appears to be specific to this operator, the others (and the static functions) are working properly.
    Reproduction Steps
    usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
    Expected behavior
    JIT should emit the correct instruction operand.
    Actual behavior
    JIT emits an incorrect instruction operand:
    ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
    Regression?
    No response
    Known Workarounds
    Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
    Configuration
    .NET SDK:
    
Version: 8.0.100-preview.6.23330.14
    
Commit: ba97796b8f
    Runtime Environment:
    
OS Name: Windows
    
OS Version: 10.0.22621
    Other information
    No response
    Metadata
    Metadata
    Assignees
    Labels
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
    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("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
      Closed
      #89339
      Closed
      Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
      #89339
      Assignees
      tannergooding
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
      Milestone
      8.0.0
      Description
      @dubiousconst282
      dubiousconst282
      opened on Jul 22, 2023
      Description
      When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
      This problem appears to be specific to this operator, the others (and the static functions) are working properly.
      Reproduction Steps
      usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
      Expected behavior
      JIT should emit the correct instruction operand.
      Actual behavior
      JIT emits an incorrect instruction operand:
      ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
      Regression?
      No response
      Known Workarounds
      Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
      Configuration
      .NET SDK:
      
Version: 8.0.100-preview.6.23330.14
      
Commit: ba97796b8f
      Runtime Environment:
      
OS Name: Windows
      
OS Version: 10.0.22621
      Other information
      No response
      Metadata
      Metadata
      Assignees
      Labels
      area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
      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
        Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
        Closed
        #89339
        Closed
        Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
        #89339
        Assignees
        tannergooding
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
        Milestone
        8.0.0
        Description
        @dubiousconst282
        dubiousconst282
        opened on Jul 22, 2023
        Description
        When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
        This problem appears to be specific to this operator, the others (and the static functions) are working properly.
        Reproduction Steps
        usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
        Expected behavior
        JIT should emit the correct instruction operand.
        Actual behavior
        JIT emits an incorrect instruction operand:
        ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
        Regression?
        No response
        Known Workarounds
        Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
        Configuration
        .NET SDK:
        
Version: 8.0.100-preview.6.23330.14
        
Commit: ba97796b8f
        Runtime Environment:
        
OS Name: Windows
        
OS Version: 10.0.22621
        Other information
        No response
        Metadata
        Metadata
        Assignees
        Labels
        area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
        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("// 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
          Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
          Closed
          #89339
          Closed
          Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
          #89339
          Assignees
          tannergooding
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
          Milestone
          8.0.0
          Description
          @dubiousconst282
          dubiousconst282
          opened on Jul 22, 2023
          Description
          When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
          This problem appears to be specific to this operator, the others (and the static functions) are working properly.
          Reproduction Steps
          usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
          Expected behavior
          JIT should emit the correct instruction operand.
          Actual behavior
          JIT emits an incorrect instruction operand:
          ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
          Regression?
          No response
          Known Workarounds
          Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
          Configuration
          .NET SDK:
          
Version: 8.0.100-preview.6.23330.14
          
Commit: ba97796b8f
          Runtime Environment:
          
OS Name: Windows
          
OS Version: 10.0.22621
          Other information
          No response
          Metadata
          Metadata
          Assignees
          Labels
          area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
          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
            Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
            Closed
            #89339
            Closed
            Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
            #89339
            Assignees
            tannergooding
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
            Milestone
            8.0.0
            Description
            @dubiousconst282
            dubiousconst282
            opened on Jul 22, 2023
            Description
            When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
            This problem appears to be specific to this operator, the others (and the static functions) are working properly.
            Reproduction Steps
            usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
            Expected behavior
            JIT should emit the correct instruction operand.
            Actual behavior
            JIT emits an incorrect instruction operand:
            ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
            Regression?
            No response
            Known Workarounds
            Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
            Configuration
            .NET SDK:
            
Version: 8.0.100-preview.6.23330.14
            
Commit: ba97796b8f
            Runtime Environment:
            
OS Name: Windows
            
OS Version: 10.0.22621
            Other information
            No response
            Metadata
            Metadata
            Assignees
            Labels
            area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
            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
              Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
              Closed
              #89339
              Closed
              Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
              #89339
              Assignees
              tannergooding
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
              Milestone
              8.0.0
              Description
              @dubiousconst282
              dubiousconst282
              opened on Jul 22, 2023
              Description
              When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
              This problem appears to be specific to this operator, the others (and the static functions) are working properly.
              Reproduction Steps
              usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
              Expected behavior
              JIT should emit the correct instruction operand.
              Actual behavior
              JIT emits an incorrect instruction operand:
              ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
              Regression?
              No response
              Known Workarounds
              Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
              Configuration
              .NET SDK:
              
Version: 8.0.100-preview.6.23330.14
              
Commit: ba97796b8f
              Runtime Environment:
              
OS Name: Windows
              
OS Version: 10.0.22621
              Other information
              No response
              Metadata
              Metadata
              Assignees
              Labels
              area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
              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)) {
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                Invalid codegen for Vector512 arithmetic right shift operator (>>) #89338
                Closed
                #89339
                Closed
                Invalid codegen for Vector512 arithmetic right shift operator (>>)#89338
                #89339
                Assignees
                tannergooding
                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
                Milestone
                8.0.0
                Description
                @dubiousconst282
                dubiousconst282
                opened on Jul 22, 2023
                Description
                When right shifting a Vector512 with the >> operator, the generated code contains a shift instruction to the ymm register rather than zmm, causing the upper lanes of the resulting vector to contain zeroes/wrong values.
                This problem appears to be specific to this operator, the others (and the static functions) are working properly.
                Reproduction Steps
                usingSystem.Runtime.CompilerServices;usingSystem.Runtime.Intrinsics;classProgram{[MethodImpl(MethodImplOptions.NoInlining)]staticVector512<int>BadShift(Vector512<int>x)=>x>>8;staticvoidMain()=>BadShift(Vector512.Create(511));}
                Expected behavior
                JIT should emit the correct instruction operand.
                Actual behavior
                JIT emits an incorrect instruction operand:
                ; Assembly listing for method Program:BadShift(System.Runtime.Intrinsics.Vector512`1[int]):System.Runtime.Intrinsics.Vector512`1[int]; Emitting BLENDED_CODE for X64 with AVX512 - Windows; optimized code; rsp based frame; partially interruptible; No PGO dataG_M000_IG01: ;; offset=0000HvzeroupperG_M000_IG02: ;; offset=0003Hvmovupszmm0, zmmword ptr [rdx]vpsradymm0,ymm0,8vmovups zmmword ptr [rcx],zmm0movrax,rcxG_M000_IG03: ;; offset=0017Hvzeroupperret; Total bytes of code 27
                Regression?
                No response
                Known Workarounds
                Using Vector512.ShiftRightArithmetic(x, 8) instead of x >> 8.
                Configuration
                .NET SDK:
                
Version: 8.0.100-preview.6.23330.14
                
Commit: ba97796b8f
                Runtime Environment:
                
OS Name: Windows
                
OS Version: 10.0.22621
                Other information
                No response
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                Labels
                area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture
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