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
..
ADT	Roll back the ConstStringRef change for now	2014-01-27 05:24:39 +00:00
Analysis	[TLI] Add a new hook to TargetLowering to query the target if a load of a constant should be converted to simply the constant itself.	2014-01-28 01:20:14 +00:00
AsmParser	Move the LLVM IR asm writer header files into the IR directory, as they	2014-01-07 12:34:26 +00:00
Bitcode	Make parseBitcodeFile return an ErrorOr<Module *>.	2014-01-15 01:08:23 +00:00
CodeGen	[TLI] Add a new hook to TargetLowering to query the target if a load of a constant should be converted to simply the constant itself.	2014-01-28 01:20:14 +00:00
Config	Remove the test for endianness in configure.ac and regenerate.	2014-01-09 01:09:57 +00:00
DebugInfo	llvm-dwarfdump: type unit dwo support	2014-01-09 05:08:24 +00:00
ExecutionEngine	Add target analysis passes to the codegen pipeline for MCJIT.	2014-01-23 19:23:28 +00:00
IR	MIPS: mark intrinsics IntrNoMem so all patterns using them are consistent.	2014-01-21 10:41:16 +00:00
IRReader	Split out the IRReader header and the utility functions it provides into	2013-03-26 02:25:37 +00:00
LTO	Adding new LTO APIs to parse metadata nodes and extract linker options and	2014-01-21 18:31:27 +00:00
MC	MC: Add support for .cfi_startproc simple	2014-01-27 17:20:25 +00:00
Object	[Sparc] Add support for parsing DW_CFA_GNU_window_save.	2014-01-26 05:13:44 +00:00
Option	Option parsing: support case-insensitive option matching.	2013-08-28 20:04:31 +00:00
Support	[vectorizer] Teach the loop vectorizer's unroller to only unroll by	2014-01-27 11:12:24 +00:00
TableGen	Typo fix.	2014-01-24 23:40:08 +00:00
Target	[TLI] Add a new hook to TargetLowering to query the target if a load of a constant should be converted to simply the constant itself.	2014-01-28 01:20:14 +00:00
Transforms	[LPM] Fix PR18616 where the shifts to the loop pass manager to extract	2014-01-28 01:25:38 +00:00
AutoUpgrade.h	Debug Info: drop debug info via upgrading path if version number does not match.	2013-12-02 21:29:56 +00:00
CMakeLists.txt	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
DebugInfo.h	Re-sort all of the includes with ./utils/sort_includes.py so that	2014-01-07 11:48:04 +00:00
DIBuilder.h	typo	2014-01-18 02:12:10 +00:00
GVMaterializer.h	Use error_code in GVMaterializer.	2013-11-05 19:36:34 +00:00
InitializePasses.h	Revert "Revert "Add Constant Hoisting Pass" (r200034)"	2014-01-25 02:02:55 +00:00
InstVisitor.h	Add addrspacecast instruction.	2013-11-15 01:34:59 +00:00
LinkAllIR.h	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
LinkAllPasses.h	Revert "Revert "Add Constant Hoisting Pass" (r200034)"	2014-01-25 02:02:55 +00:00
Linker.h	Add a 'deleteModule' method to the Linker class.	2013-10-16 08:59:57 +00:00
Pass.h	moves doInitialization and doFinalization to the Pass class and removes some unreachable code in MachineModuleInfo	2012-12-03 21:56:57 +00:00
PassAnalysisSupport.h	Fix include guards so they exactly match file names.	2013-01-10 00:45:19 +00:00
PassManager.h	Move the old pass manager infrastructure into a legacy namespace and	2013-11-09 12:26:54 +00:00
PassRegistry.h	Re-sort all of the includes with ./utils/sort_includes.py so that	2014-01-07 11:48:04 +00:00
PassSupport.h	[opt][PassInfo] Allow opt to run passes that need target machine.	2014-01-16 21:44:34 +00:00