Chandler Carruth 5ea4a54551 [LPM] Fix PR18616 where the shifts to the loop pass manager to extract ... LCSSA from it caused a crasher with the LoopUnroll pass. This crasher is really nasty. We destroy LCSSA form in a suprising way. When unrolling a loop into an outer loop, we not only need to restore LCSSA form for the outer loop, but for all children of the outer loop. This is somewhat obvious in retrospect, but hey! While this seems pretty heavy-handed, it's not that bad. Fundamentally, we only do this when we unroll a loop, which is already a heavyweight operation. We're unrolling all of these hypothetical inner loops as well, so their size and complexity is already on the critical path. This is just adding another pass over them to re-canonicalize. I have a test case from PR18616 that is great for reproducing this, but pretty useless to check in as it relies on many 10s of nested empty loops that get unrolled and deleted in just the right order. =/ What's worse is that investigating this has exposed another source of failure that is likely to be even harder to test. I'll try to come up with test cases for these fixes, but I want to get the fixes into the tree first as they're causing crashes in the wild. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200273 91177308-0d34-0410-b5e6-96231b3b80d8		2014-01-28 01:25:38 +00:00
..
ASanStackFrameLayout.cpp	[asan] fix ndebug build with strict warnings (-Wunused-variable)	2013-12-06 09:26:09 +00:00
BasicBlockUtils.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
BreakCriticalEdges.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
BuildLibCalls.cpp	Enable double to float shrinking optimizations for binary functions like 'fmin/fmax'. Fix radar:15283121	2013-12-16 22:42:40 +00:00
BypassSlowDivision.cpp	Bypass Slow Divides	2013-03-04 18:13:57 +00:00
CloneFunction.cpp	Extend RemapInstruction and friends to take an optional new parameter, a ValueMaterializer.	2013-05-28 15:17:05 +00:00
CloneModule.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
CMakeLists.txt	[asan] rewrite asan's stack frame layout	2013-12-06 09:00:17 +00:00
CmpInstAnalysis.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
CodeExtractor.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
DemoteRegToStack.cpp	Re-sort all of the includes with ./utils/sort_includes.py so that	2014-01-07 11:48:04 +00:00
FlattenCFG.cpp	Fix known typos	2014-01-24 17:20:08 +00:00
GlobalStatus.cpp	Handle calls and invokes in GlobalStatus.	2013-10-25 21:29:52 +00:00
InlineFunction.cpp	Fix inlining to not lose the "cleanup" clause from landingpads	2013-12-08 00:51:21 +00:00
InstructionNamer.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
IntegerDivision.cpp	Add support for software expansion of 64-bit integer division instructions.	2013-11-19 06:54:19 +00:00
LCSSA.cpp	[LPM] Fix PR18616 where the shifts to the loop pass manager to extract	2014-01-28 01:25:38 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Local.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopSimplify.cpp	[LPM] Make LoopSimplify no longer a LoopPass and instead both a utility	2014-01-23 11:23:19 +00:00
LoopUnroll.cpp	[LPM] Fix PR18616 where the shifts to the loop pass manager to extract	2014-01-28 01:25:38 +00:00
LoopUnrollRuntime.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
LowerExpectIntrinsic.cpp	Fix spelling intruction -> instruction.	2013-09-28 11:46:15 +00:00
LowerInvoke.cpp	Remove several unused variables.	2013-10-01 13:32:03 +00:00
LowerSwitch.cpp	Revert patches to add case-range support for PR1255.	2013-09-09 19:14:35 +00:00
Makefile
Mem2Reg.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
MetaRenamer.cpp	Add 'const' qualifier to some arrays.	2013-07-15 08:02:13 +00:00
ModuleUtils.cpp	Respect llvm.used in Internalize.	2013-07-25 03:23:25 +00:00
PromoteMemoryToRegister.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
SimplifyCFG.cpp	PGO branch weight: keep halving the weights until they can fit into	2014-01-27 23:39:03 +00:00
SimplifyIndVar.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
SimplifyInstructions.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
SimplifyLibCalls.cpp	Enable double to float shrinking optimizations for binary functions like 'fmin/fmax'. Fix radar:15283121	2013-12-16 22:42:40 +00:00
SpecialCaseList.cpp	Re-sort all of the includes with ./utils/sort_includes.py so that	2014-01-07 11:48:04 +00:00
SSAUpdater.cpp	Basic blocks typically have few predecessors. Use a SmallDenseMap to	2013-10-14 16:05:55 +00:00
UnifyFunctionExitNodes.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
Utils.cpp	Re-sort all of the includes with ./utils/sort_includes.py so that	2014-01-07 11:48:04 +00:00
ValueMapper.cpp	Extend RemapInstruction and friends to take an optional new parameter, a ValueMaterializer.	2013-05-28 15:17:05 +00:00