Optimize NativeAOT delegate field layout - #129304

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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.
Diffs are here for x64 and here for arm64.

I'm planning to do a similar change for CoreCLR after #99200.

cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.

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/azp run runtime-nativeaot-outerloop

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Nice!

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/azp run runtime-nativeaot-outerloop

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/ba-g armel build break that is fixed in main already, DeadLetter

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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?

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Makes sense to me.

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Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
@dotnet-milestone-botdotnet-milestone-botBot added this to the 11.0-preview6 milestone Jun 17, 2026
eiriktsarpalis pushed a commit that referenced this pull request Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit that referenced this pull request Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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Optimize NativeAOT delegate field layout - #129304
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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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Nice!
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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, 'i');
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Optimize NativeAOT delegate field layout - #129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
this pull request
Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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, 'i');
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try {
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Optimize NativeAOT delegate field layout - #129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Optimize NativeAOT delegate field layout - #129304
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MichalPetryka:naot-delegate-layout
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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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@MichalPetryka@jkotas
Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
this pull request
Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Optimize NativeAOT delegate field layout - #129304
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MichalPetryka:naot-delegate-layout
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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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Nice!
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
this pull request
Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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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
Optimize NativeAOT delegate field layout - #129304
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MichalPetryka:naot-delegate-layout
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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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Nice!
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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@MichalPetryka@jkotas
Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
this pull request
Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Optimize NativeAOT delegate field layout - #129304
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MichalPetryka:naot-delegate-layout
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Optimize NativeAOT delegate field layout#129304
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Placing the 2 fields used to call a delegate makes it less likely to split cache lines and makes every delegate call on arm64 smaller due to it being able to use ldp.

Diffs are here for x64 and here for arm64.
I'm planning to do a similar change for CoreCLR after #99200.
cc @MichalStrehovsky this was the arm64 size reduction I mentioned on Discord.
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Tagging subscribers to this area: @agocke, @dotnet/ilc-contrib

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/azp run runtime-nativeaot-outerloop
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Nice!
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/azp run runtime-nativeaot-outerloop
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/ba-g armel build break that is fixed in main already, DeadLetter
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@jkotas I'm wondering if it makes sense to unify the layout to be the same between CoreCLR and NAOT in the followup PR and make the field names the same to make code sharing easier, do you think I should do that after #99200?
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Makes sense to me.
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@MichalPetryka@jkotas
Optimize delegate layout on CoreCLR (#129410)
0080389
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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eiriktsarpalis pushed a commit
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Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize NativeAOT delegate field layout (#129304)
b1f0bab
Placing the 2 fields used to call a delegate makes it less likely to
split cache lines and makes every delegate call on arm64 smaller due to
it being able to use `ldp`.
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
eiriktsarpalis pushed a commit
that referenced
this pull request
Jul 15, 2026
@MichalPetryka@jkotas@eiriktsarpalis
Optimize delegate layout on CoreCLR (#129410)
14d75b2
CoreCLR equivalent of #129304 cc @jkotas
---------
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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