Andrew Trick c846d65f99 Fix PR18361: Invalidate LoopDispositions after LoopSimplify hoists things. ... getSCEV for an ashr instruction creates an intermediate zext expression when it truncates its operand. The operand is initially inside the loop, so the narrow zext expression has a non-loop-invariant loop disposition. LoopSimplify then runs on an outer loop, hoists the ashr operand, and properly invalidate the SCEVs that are mapped to value. The SCEV expression for the ashr is now an AddRec with the hoisted value as the now loop-invariant start value. The LoopDisposition of this wide value was properly invalidated during LoopSimplify. However, if we later get the ashr SCEV again, we again try to create the intermediate zext expression. We get the same SCEV that we did earlier, and it is still cached because it was never mapped to a Value. When we try to create a new AddRec we abort because we're using the old non-loop-invariant LoopDisposition. I don't have a solution for this other than to clear LoopDisposition when LoopSimplify hoists things. I think the long-term strategy should be to perform LoopSimplify on all loops before computing SCEV and before running any loop opts on individual loops. It's possible we may want to rerun LoopSimplify on individual loops, but it should rarely do anything, so rarely require invalidating SCEV. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198478 91177308-0d34-0410-b5e6-96231b3b80d8		2014-01-04 05:52:49 +00:00
..
Analysis	BasicAA: Use reachabilty instead of dominance for checking value equality in phi	2014-01-03 05:47:03 +00:00
Assembler	Allow addrspacecast in global aliases	2014-01-02 20:55:01 +00:00
Bindings	Update the ML test to expect the new string format of getStringRepresentation.	2013-12-19 23:38:09 +00:00
Bitcode	Fold vector selects with undef elements in the condition. Fixes PR18319.	2013-12-31 19:30:47 +00:00
BugPoint
CodeGen	[RegAlloc] Make tryInstructionSplit less aggressive.	2014-01-02 22:47:22 +00:00
DebugInfo	Revert "Revert "Debug Info: Type Units: Simplify type hashing using IR-provided unique names.""	2014-01-03 18:59:42 +00:00
ExecutionEngine
Feature
FileCheck
Instrumentation	[ASan] Fix the tests broken by r198018 to check for private linkage of ASan-generated globals.	2013-12-25 17:06:04 +00:00
Integer
JitListener
Linker
LTO
MC	[AArch64][NEON] Added SXTL and SXTL2 instruction aliases	2014-01-03 19:20:31 +00:00
Object
Other
TableGen	[TableGen] Correctly generate implicit anonymous prototype defs in multiclasses	2014-01-02 20:47:09 +00:00
tools	Teach the llvm-readobj COFF dumper to dump debug line tables from object files	2013-12-19 11:37:14 +00:00
Transforms	Fix PR18361: Invalidate LoopDispositions after LoopSimplify hoists things.	2014-01-04 05:52:49 +00:00
Unit
Verifier	Fix all the verifier tests I added for address spaces.	2014-01-02 21:09:05 +00:00
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg
lit.site.cfg.in	[CMake] Add missing set_output_directory after Takumi's change in r198205.	2014-01-02 19:47:45 +00:00
Makefile
Makefile.tests
TestRunner.sh