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JIT: fix another case of early flow graph divergence - #85873

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JIT: fix another case of early flow graph divergence#85873
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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
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area-CodeGen-coreclr

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@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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Diffs these are all in Tier0 instrumentation strategy / schema.

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JIT: fix another case of early flow graph divergence by AndyAyersMS · Pull Request #85873 · dotnet/runtime · GitHub
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JIT: fix another case of early flow graph divergence - #85873

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AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

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@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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Diffs these are all in Tier0 instrumentation strategy / schema.

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, '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('^' + ".*" + ' JIT: fix another case of early flow graph divergence by AndyAyersMS · Pull Request #85873 · dotnet/runtime · GitHub
Skip to content

JIT: fix another case of early flow graph divergence - #85873

Merged
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

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@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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MemberAuthor

The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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MemberAuthor

Diffs these are all in Tier0 instrumentation strategy / schema.

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@AndyAyersMS@EgorBo
, '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('^' + ".*" + ' JIT: fix another case of early flow graph divergence by AndyAyersMS · Pull Request #85873 · dotnet/runtime · GitHub
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JIT: fix another case of early flow graph divergence - #85873

Merged
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

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@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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MemberAuthor

The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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Copy Markdown
MemberAuthor

Diffs these are all in Tier0 instrumentation strategy / schema.

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JIT: fix another case of early flow graph divergence - #85873

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AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
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AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

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MemberAuthor

@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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MemberAuthor

The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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MemberAuthor

Diffs these are all in Tier0 instrumentation strategy / schema.

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, '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('^' + ".*" + ' JIT: fix another case of early flow graph divergence by AndyAyersMS · Pull Request #85873 · dotnet/runtime · GitHub
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JIT: fix another case of early flow graph divergence - #85873

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AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
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AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
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area-CodeGen-coreclr

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@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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Diffs these are all in Tier0 instrumentation strategy / schema.

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, '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('^' + ".*" + ' JIT: fix another case of early flow graph divergence by AndyAyersMS · Pull Request #85873 · dotnet/runtime · GitHub
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JIT: fix another case of early flow graph divergence - #85873

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AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

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MemberAuthor

@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

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MemberAuthor

The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

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MemberAuthor

Diffs these are all in Tier0 instrumentation strategy / schema.

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Skip to content

JIT: fix another case of early flow graph divergence - #85873

Merged
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase
May 7, 2023
Merged

JIT: fix another case of early flow graph divergence#85873
AndyAyersMS merged 1 commit into
dotnet:mainfrom
AndyAyersMS:ConsistentlyMergeBlocksEarlyAnotherCase

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@AndyAyersMS

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The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

The JIT will sometimes decide to instrument a Tier0 method even if `BBINSTR`
is not passed by the VM (this is enabled when the VM passes `BBINSTR_IF_LOOPS`
so that we can provide some PGO data to OSR methods).
In such cases we build the flow graph and then decide to instrument, so the
flow graph shape may differ from the case where we know up front that we are going
to instrument or optimize.
Remedy this by also running the early branch to next flow graph opt when a Tier0
JIT is passed `BBINSTR_IF_LOOPS`.
Addresses another case of dotnet#85856.
@ghostghost assigned AndyAyersMSMay 6, 2023
@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 6, 2023
@ghost

ghost commented May 6, 2023

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

The JIT will sometimes decide to instrument a Tier0 method even if BBINSTR is not passed by the VM (this is enabled when the VM passes BBINSTR_IF_LOOPS so that we can provide some PGO data to OSR methods).

In such cases we build the flow graph and then decide to instrument, so the flow graph shape may differ from the case where we know up front that we are going to instrument or optimize.

Remedy this by also running the early branch to next flow graph opt when a Tier0 JIT is passed BBINSTR_IF_LOOPS.

Addresses another case of #85856.

Author:AndyAyersMS
Assignees:AndyAyersMS
Labels:

area-CodeGen-coreclr

Milestone:-

@AndyAyersMS

Copy link
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MemberAuthor

@EgorBo PTAL
cc @dotnet/jit-contrib

Relatively small number of diffs, but this impacts some important methods....

@EgorBoEgorBo left a comment

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The name sounds a bit weird but I don't have a better alternative🙂

@AndyAyersMS

Copy link
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MemberAuthor

The name sounds a bit weird but I don't have a better alternative🙂

We can always change it later....

@AndyAyersMS

Copy link
Copy Markdown
MemberAuthor

Diffs these are all in Tier0 instrumentation strategy / schema.

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Labels

area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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Successfully merging this pull request may close these issues.

2 participants

@AndyAyersMS@EgorBo