3 Commits

Author	SHA1	Message	Date
Juneyoung Lee	54b6457240	[TargetPassConfig] Add CanonicalizeFreezeInLoops before LSR ... Summary: This patch adds CanonicalizeFreezeInLoops before LSR. Relevant patch: https://reviews.llvm.org/D77523 Reviewers: spatel, efriedma, jdoerfert, fhahn, nikic, reames, xbolva00 Reviewed By: nikic Subscribers: xbolva00, nikic, lebedev.ri, hiraditya, llvm-commits, sanwou01, nlopes Tags: #llvm Differential Revision: https://reviews.llvm.org/D77524	2020-05-28 05:21:12 +09:00
Juneyoung Lee	58f7c938a1	add a test for D77524	2020-05-21 10:03:27 +09:00
Juneyoung Lee	d9a4a24413	Add CanonicalizeFreezeInLoops pass ... Summary: If an induction variable is frozen and used, SCEV yields imprecise result because it doesn't say anything about frozen variables. Due to this reason, performance degradation happened after https://reviews.llvm.org/D76483 is merged, causing SCEV yield imprecise result and preventing LSR to optimize a loop. The suggested solution here is to add a pass which canonicalizes frozen variables inside a loop. To be specific, it pushes freezes out of the loop by freezing the initial value and step values instead & dropping nsw/nuw flags from instructions used by freeze. This solution was also mentioned at https://reviews.llvm.org/D70623 . Reviewers: spatel, efriedma, lebedev.ri, fhahn, jdoerfert Reviewed By: fhahn Subscribers: nikic, mgorny, hiraditya, javed.absar, llvm-commits, sanwou01, nlopes Tags: #llvm Differential Revision: https://reviews.llvm.org/D77523	2020-05-21 09:29:29 +09:00