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
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Hello	Set LLVM_EXPORTED_SYMBOL_FILE in CMakeLists whose corresponding Makefiles do so.	2013-12-29 23:06:49 +00:00
InstCombine	InstCombine: Don't try to use aggregate elements of ConstantExprs.	2014-01-24 19:02:37 +00:00
Instrumentation	Fix known typos	2014-01-24 17:20:08 +00:00
IPO	Fix known typos	2014-01-24 17:20:08 +00:00
ObjCARC	Fix known typos	2014-01-24 17:20:08 +00:00
Scalar	ConstantHoisting: We can't insert instructions directly in front of a PHI node.	2014-01-27 13:11:43 +00:00
Utils	[LPM] Fix PR18616 where the shifts to the loop pass manager to extract	2014-01-28 01:25:38 +00:00
Vectorize	LoopVectorize: Support conditional stores by scalarizing	2014-01-28 01:01:53 +00:00
CMakeLists.txt	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00
LLVMBuild.txt	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00
Makefile	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00