Balaram Makam 58953554d4 [SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure. ... Summary: When simplifying unconditional branches from empty blocks, we pre-test if the BB belongs to a set of loop headers and keep the block to prevent passes from destroying canonical loop structure. However, the current algorithm fails if the destination of the branch is a loop header. Especially when such a loop's latch block is folded into loop header it results in additional backedges and LoopSimplify turns it into a nested loop which prevent later optimizations from being applied (e.g., loop unrolling and loop interleaving). This patch augments the existing algorithm by further checking if the destination of the branch belongs to a set of loop headers and defer eliminating it if yes to LateSimplifyCFG. Fixes PR33605: https://bugs.llvm.org/show_bug.cgi?id=33605 Reviewers: efriedma, mcrosier, pacxx, hsung, davidxl Reviewed By: efriedma Subscribers: ashutosh.nema, gberry, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D35411 llvm-svn: 308422		2017-07-19 08:53:34 +00:00
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AMDGPU	AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel	2017-03-21 21:39:51 +00:00
2006-06-13-SingleEntryPHI.ll
2006-06-27-DeadSwitchCase.ll
2007-05-09-tl.ll
2007-05-09-Unreachable.ll
2007-07-12-ExitDomInfo.ll
2007-07-13-DomInfo.ll
2007-07-18-DomInfo.ll
2007-08-01-Dom.ll
2007-08-01-LCSSA.ll
2007-10-04-DomFrontier.ll
2008-06-02-DomInfo.ll
2008-06-17-DomFrontier.ll
2008-11-03-Invariant.ll	Revert "[SCEV] Enable SCEV verification by default in EXPENSIVE_CHECKS builds"	2017-04-24 02:35:19 +00:00
2010-11-18-LCSSA.ll
2011-06-02-CritSwitch.ll
2011-09-26-EHCrash.ll
2011-11-18-SimpleSwitch.ll	[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.	2017-06-25 22:45:31 +00:00
2011-11-18-TwoSwitches-Threshold.ll	[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.	2017-06-25 22:45:31 +00:00
2011-11-18-TwoSwitches.ll	[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.	2017-06-25 22:45:31 +00:00
2012-04-02-IndirectBr.ll
2012-04-30-LoopUnswitch-LPad-Crash.ll
2012-05-20-Phi.ll
2015-06-17-Metadata.ll	[SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.	2017-07-19 08:53:34 +00:00
2015-09-18-Addrspace.ll
basictest.ll
cleanuppad.ll
copy-metadata.ll	[LoopUnswitch] Fix a test case	2017-04-11 04:11:47 +00:00
crash.ll
elseif-non-exponential-behavior.ll
exponential-behavior.ll
guards.ll
infinite-loop.ll	[SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.	2017-07-19 08:53:34 +00:00
LIV-loop-condtion.ll
msan.ll
pr32818.ll	[LoopUnswitch] Don't remove instructions with side effects.	2017-04-29 00:12:18 +00:00
preserve-analyses.ll
simplify-with-nonvalness.ll
trivial-unswitch.ll