Avoid calling getEnclosingBlock #16455
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While performing analysis for flush elimination, LocalFlushElimination::examineNode called TR::TreeTop::getEnclosingBlock on the current TR::TreeTop. As that method walks through the linked list chaining together the TR::TreeTops to find the corresponding BBStart, calling it in nested loops becomes very expensive when large blocks are encountered. Fixed this by passing the current block as an argument to LocalFlushElimination::examineNode Signed-off-by: Henry Zongaro <zongaro@ca.ibm.com>
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Vijay @vijaysun-omr, may I ask you to review this change? |
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Jenkins test sanity all jdk8,jdk11,jdk19 |
vijaysun-omr
approved these changes
Dec 12, 2022
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Checks have passed. Merging. |
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I think we need this fix in the v0.36 branch, too. |
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While performing analysis for flush elimination,
LocalFlushElimination::examineNodecalledTR::TreeTop::getEnclosingBlockon the currentTR::TreeTop. As that method walks through the linked list chaining together theTR::TreeTops to find the correspondingBBStart, calling it in nested loops becomes very expensive when large blocks are encountered.Fixed this by passing the current block as an argument to
LocalFlushElimination::examineNode.Fixes #16353