JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
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amanasifkhalid:loopCompactionInsert
Mar 19, 2024
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
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amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

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amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
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amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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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" + '
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
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amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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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('^' + ".*" + '
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

Merged
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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ContributorAuthor

The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

@AndyAyersMS

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

@jakobbotsch

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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, '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('^' + ".*" + '
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

@AndyAyersMS

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

@jakobbotsch

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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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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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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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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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

Merged
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
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amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
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amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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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('^' + ".*" + '
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
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amanasifkhalid:loopCompactionInsert
Mar 19, 2024
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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, '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); } })(); })();
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JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint - #99827

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amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert
Mar 19, 2024
Merged

JIT: Remove bbFallsThrough check in optFindLoopCompactionInsertionPoint#99827
amanasifkhalid merged 2 commits into
dotnet:mainfrom
amanasifkhalid:loopCompactionInsert

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@amanasifkhalid

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Calling bbFallsThrough isn't all that helpful here, as it doesn't consider BBJ_ALWAYS blocks to the next block, BBJ_COND blocks that don't fall through for the false path, etc. I'm planning on getting rid of bbFallsThrough everywhere except in fgReorderBlocks (that removal will hopefully come when we replace our block layout algorithm altogether), but to still be able to short-circuit optFindLoopCompactionInsertionPoint, I added some manual checks for blocks that can "fall through."

cc @dotnet/jit-contrib, @jakobbotsch PTAL. The diffs weren't that big locally, but I'm open to different/more radical approaches here. Thanks!

@ghostghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 15, 2024
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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@AndyAyersMS

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The more radical thing would be to stop doing loop compaction entirely. Now that we have a flow-based approach to finding loops, it should not matter what other blocks might appear between the lexically first and lexically last loop blocks.

Whether we can "fix" this later though is likely the big question. Once we get to layout we will want to make loop bodies compact.

@amanasifkhalid

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The more radical thing would be to stop doing loop compaction entirely.

I tried this locally out of curiosity, and the size/PerfScore regressions suggest our current layout algorithm doesn't handle uncompacted loops all that well. I've added a note to #93020 to consider skipping loop compaction once have a new layout algorithm, assuming the new algorithm does a decent job of placing loop bodies' blocks contiguously -- if we start with a RPO traversal, I guess that would negate the need for compaction?

@AndyAyersMS

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if we start with a RPO traversal, I guess that would negate the need for compaction?

I believe that's the case, yes.

@jakobbotsch

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I don't think RPO will guarantee compactness of natural loops -- for example, the RPO can have outside-loop successors of the exiting blocks between the header and its inside-loop successors.

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Seems fine to me. I hope long term we remove the compaction entirely in favor of the block layout in the backend.

@amanasifkhalid
amanasifkhalid merged commit 43a9236 into dotnet:mainMar 19, 2024
@amanasifkhalid
amanasifkhalid deleted the loopCompactionInsert branch March 19, 2024 14:36
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3 participants

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