Wei Mi e35a5f5518 [SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent ... the exponential behavior. The patch is to fix PR32043. Functions getZeroExtendExpr and getSignExtendExpr may call themselves recursively more than once. This is potentially a 2^N complexity behavior. The exponential behavior was not commonly exposed before because of existing global cache mechnism like UniqueSCEVs or some early return mechanism when flags FlagNSW or FlagNUW are seen. However, we still have case which can expose the exponential behavior, like the case in PR32043, so we add a local cache in getZeroExtendExpr and getSignExtendExpr. If the input of the functions -- SCEV and type pair have been seen before, we can find the extended expression directly in the local cache. Differential Revision: https://reviews.llvm.org/D30350 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300494 91177308-0d34-0410-b5e6-96231b3b80d8		2017-04-17 20:40:05 +00:00
..
AliasAnalysisTest.cpp	Revert @llvm.assume with operator bundles (r289755-r289757)	2016-12-19 08:22:17 +00:00
BlockFrequencyInfoTest.cpp	Add an interface to scale the frequencies of a set of blocks.	2017-01-19 18:53:16 +00:00
BranchProbabilityInfoTest.cpp	Retry: [BPI] Use a safer constructor to calculate branch probabilities	2016-12-17 01:02:08 +00:00
CallGraphTest.cpp	[GraphTraits] Replace all NodeType usage with NodeRef	2016-08-22 21:09:30 +00:00
CFGTest.cpp	Remove every uses of getGlobalContext() in LLVM (but the C API)	2016-04-14 21:59:01 +00:00
CGSCCPassManagerTest.cpp	[PM] Introduce the facilities for registering cross-IR-unit dependencies	2016-12-27 08:40:39 +00:00
CMakeLists.txt	MemorySSA: Move to Analysis, from Transforms/Utils. It's used as	2017-04-11 20:06:36 +00:00
LazyCallGraphTest.cpp	Fix signed/unsigned comparison warnings	2017-03-11 13:02:31 +00:00
LoopInfoTest.cpp	[LoopInfo] Add helper methods to compute two useful orderings of the	2017-01-20 02:41:20 +00:00
MemoryBuiltinsTest.cpp	Don't consider allocsize functions to be allocation functions.	2016-12-23 01:18:09 +00:00
MemorySSA.cpp	MemorySSA: Move to Analysis, from Transforms/Utils. It's used as	2017-04-11 20:06:36 +00:00
ProfileSummaryInfoTest.cpp	Refactor the PSI to extract getCallSiteCount and remove checks for profile type.	2017-03-10 19:45:16 +00:00
ScalarEvolutionTest.cpp	[SCEV] Add a local cache for getZeroExtendExpr and getSignExtendExpr to prevent	2017-04-17 20:40:05 +00:00
TargetLibraryInfoTest.cpp	[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)	2017-01-23 23:16:46 +00:00
TBAATest.cpp	[TBAA] Don't generate invalid TBAA when merging nodes	2016-12-11 20:07:25 +00:00
UnrollAnalyzer.cpp	Delete a dead argument. NFC	2017-01-15 19:53:59 +00:00
ValueTrackingTest.cpp	[ValueTracking] Avoid undefined behavior in unittest by not making a named ArrayRef from a std::initializer_list	2017-04-14 17:59:19 +00:00