Silviu Baranga a0999051a2 Re-commit [SCEV] Introduce a guarded backedge taken count and use it in LAA and LV ... This re-commits r265535 which was reverted in r265541 because it broke the windows bots. The problem was that we had a PointerIntPair which took a pointer to a struct allocated with new. The problem was that new doesn't provide sufficient alignment guarantees. This pattern was already present before r265535 and it just happened to work. To fix this, we now separate the PointerToIntPair from the ExitNotTakenInfo struct into a pointer and a bool. Original commit message: Summary: When the backedge taken codition is computed from an icmp, SCEV can deduce the backedge taken count only if one of the sides of the icmp is an AddRecExpr. However, due to sign/zero extensions, we sometimes end up with something that is not an AddRecExpr. However, we can use SCEV predicates to produce a 'guarded' expression. This change adds a method to SCEV to get this expression, and the SCEV predicate associated with it. In HowManyGreaterThans and HowManyLessThans we will now add a SCEV predicate associated with the guarded backedge taken count when the analyzed SCEV expression is not an AddRecExpr. Note that we only do this as an alternative to returning a 'CouldNotCompute'. We use new feature in Loop Access Analysis and LoopVectorize to analyze and transform more loops. Reviewers: anemet, mzolotukhin, hfinkel, sanjoy Subscribers: flyingforyou, mcrosier, atrick, mssimpso, sanjoy, mzolotukhin, llvm-commits Differential Revision: http://reviews.llvm.org/D17201 llvm-svn: 265786		2016-04-08 14:29:09 +00:00
..
AssumptionCache
BasicAA	[PM/AA] Port alias analysis evaluator to the new pass manager, and use	2016-02-20 03:46:03 +00:00
BlockFrequencyInfo
BranchProbabilityInfo
CallGraph	[CG] Add a new pass manager printer pass for the old call graph and	2016-03-10 11:24:11 +00:00
CFLAliasAnalysis	[CFLAA] Fix PR27213; incorrect tagging of args/globals	2016-04-05 21:40:45 +00:00
CostModel	[TTI] Let the cost model estimate ctpop costs based on legality	2016-03-31 10:42:40 +00:00
Delinearization
DemandedBits	[DemandedBits] Revert r249687 due to PR26071	2016-02-03 15:05:06 +00:00
DependenceAnalysis	[DependenceAnalysis] Check if result of getConstantPart is null	2016-04-04 18:13:18 +00:00
DivergenceAnalysis	AMDGPU: Add a shader calling convention	2016-04-06 19:40:20 +00:00
DominanceFrontier	Another fix the testcase introduced by r261903 - Add the missing matches	2016-02-26 03:41:47 +00:00
Dominators
GlobalsModRef	Don't IPO over functions that can be de-refined	2016-04-08 00:48:30 +00:00
LazyCallGraph	[LCG] Spell the printing pass pipeline name for the lazy call graph	2016-03-10 11:24:06 +00:00
Lint
LoopAccessAnalysis	[LAA] Support memchecks involving loop-invariant addresses	2016-03-24 04:28:47 +00:00
LoopInfo
MemoryDependenceAnalysis
PostDominators	Introduce analysis pass to compute PostDominators in the new pass manager. NFC	2016-02-25 17:54:07 +00:00
RegionInfo	Introduce RegionInfoAnalysis, which compute Region Tree in the new PassManager. NFC	2016-02-25 17:54:25 +00:00
ScalarEvolution	Re-commit [SCEV] Introduce a guarded backedge taken count and use it in LAA and LV	2016-04-08 14:29:09 +00:00
ScopedNoAliasAA	[ScopedNoAliasAA] Make test basic.ll less confusing	2016-03-07 17:49:10 +00:00
TypeBasedAliasAnalysis	[PM/AA] Wire up TBAA to the new pass manager's registry and test it.	2016-02-20 04:04:52 +00:00
ValueTracking	InstCombine: Restrict computeKnownBits() on all Values to OptLevel > 2	2016-03-09 18:47:11 +00:00
alias-analysis-uses.ll	Add an "addUsedAAAnalyses" helper function	2016-02-09 01:21:57 +00:00