Sanjoy Das 8d16a81c33 Bugfix: SCEVExpander incorrectly marks increment operations as no-wrap ... When emitting the increment operation, SCEVExpander marks the operation as nuw or nsw based on the flags on the preincrement SCEV. This is incorrect because, for instance, it is possible that {-6,+,1} is <nuw> while {-6,+,1}+1 = {-5,+,1} is not. This change teaches SCEV to mark the increment as nuw/nsw only if it can explicitly prove that the increment operation won't overflow. Apart from the attached test case, another (more realistic) manifestation of the bug can be seen in Transforms/IndVarSimplify/pr20680.ll. NOTE: this change was landed with an incorrect commit message in rL230275 and was reverted for that reason in rL230279. This commit message is the correct one. Differential Revision: http://reviews.llvm.org/D7778 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230280 91177308-0d34-0410-b5e6-96231b3b80d8		2015-02-23 23:22:58 +00:00
..
ADCE
AddDiscriminators
AlignmentFromAssumptions
ArgumentPromotion	FileCheck-ize a test to make it easier to migrate to typeless pointers	2015-02-15 04:14:00 +00:00
AtomicExpand/ARM
BBVectorize
BDCE	[BDCE] Don't forget uses of root instructions seen before the instruction itself	2015-02-18 03:12:28 +00:00
BranchFolding
CodeExtractor
CodeGenPrepare
ConstantHoisting
ConstantMerge
ConstProp	Avoid conversion to float when creating ConstantDataArray/ConstantDataVector.	2015-02-19 16:08:20 +00:00
CorrelatedValuePropagation
DeadArgElim	DeadArgElim: aggregate Return assessment properly.	2015-02-11 23:13:11 +00:00
DeadStoreElimination
EarlyCSE	EarlyCSE: Add check lines for test added in r228760	2015-02-10 23:11:02 +00:00
FunctionAttrs
GCOVProfiling
GlobalDCE
GlobalOpt
GVN	Allow PRE to insert no-cost phi nodes	2015-02-03 20:37:08 +00:00
IndVarSimplify	Bugfix: SCEVExpander incorrectly marks increment operations as no-wrap	2015-02-23 23:22:58 +00:00
Inline	Fix a crash in the assumption cache when inlining indirect function calls	2015-02-12 21:04:22 +00:00
InstCombine	[InstCombine] Remove unnecessary variable indexing into single-element arrays	2015-02-20 03:05:53 +00:00
InstMerge	Minor fix after 229495.	2015-02-18 08:09:28 +00:00
InstSimplify	InstSimplify: simplify 0 / X if nnan and nsz	2015-02-23 18:30:25 +00:00
Internalize
IPConstantProp
IRCE	IRCE: use SCEVs instead of llvm::Value's for intermediate	2015-02-21 22:07:32 +00:00
JumpThreading	Update a test to make it easier to migrate to untyped pointers	2015-02-15 04:13:58 +00:00
LCSSA	Update a test to use FileCheck so it's easier to migrate to future typeless pointer changes	2015-02-15 04:13:57 +00:00
LICM	Teach isDereferenceablePointer() to look through bitcast constant expressions.	2015-02-05 09:15:37 +00:00
LoadCombine
LoopDeletion
LoopIdiom
LoopReroll	[LoopReroll] Relax some assumptions a little.	2015-02-16 17:02:00 +00:00
LoopRotate	LoopRotate: When reconstructing loop simplify form don't split edges from indirectbrs.	2015-02-20 20:49:25 +00:00
LoopSimplify	Teach SplitBlockPredecessors how to handle landingpad blocks.	2015-01-28 23:06:47 +00:00
LoopStrengthReduce	Bugfix: SCEVExpander incorrectly marks increment operations as no-wrap	2015-02-23 23:22:58 +00:00
LoopUnroll	Partial fix for bug 22589	2015-02-18 19:32:25 +00:00
LoopUnswitch
LoopVectorize	[x86,sdag] Two interrelated changes to the x86 and sdag code.	2015-02-19 10:36:19 +00:00
LowerAtomic
LowerBitSets	Introduce bitset metadata format and bitset lowering pass.	2015-02-20 20:30:47 +00:00
LowerExpectIntrinsic	[PM] Port LowerExpectIntrinsic to the new pass manager.	2015-01-24 11:13:02 +00:00
LowerInvoke
LowerSwitch	LowerSwitch: replace unreachable default with popular case destination	2015-01-23 20:43:51 +00:00
Mem2Reg
MemCpyOpt	ValueTracking: Make isBytewiseValue simpler and more powerful at the same time.	2015-02-07 19:29:02 +00:00
MergeFunc
MetaRenamer
ObjCARC	[objc-arc-contract] We can not move retains over instructions which can not conservatively be proven to not decrement the retain's RCIdentity.	2015-02-20 00:02:49 +00:00
PartiallyInlineLibCalls
PhaseOrdering
PlaceSafepoints	[PlaceSafepoints] Adjust enablement logic to default to off and be GC configurable per GC	2015-02-21 00:09:09 +00:00
PruneEH	Fix invalid LLVM IR in PruneEH tests	2015-02-11 02:06:47 +00:00
Reassociate	Reassociate: cannot negate a INT_MIN value	2015-02-11 19:54:44 +00:00
Reg2Mem
RewriteStatepointsForGC	Bugfix for 229954	2015-02-20 18:56:14 +00:00
SampleProfile
Scalarizer
ScalarRepl
SCCP
SeparateConstOffsetFromGEP/NVPTX
SimplifyCFG	Prevent hoisting fmul from THEN/ELSE to IF if there is fmsub/fmadd opportunity.	2015-02-23 19:15:16 +00:00
Sink
SLPVectorizer	[slp] Fix a nasty bug in the SLP vectorizer that Joerg pointed out.	2015-02-12 02:30:56 +00:00
SROA
StraightLineStrengthReduce	Add straight-line strength reduction to LLVM	2015-02-03 19:37:06 +00:00
StripSymbols
StructurizeCFG	StructurizeCFG: Use a reverse post-order traversal	2015-02-04 20:49:44 +00:00
TailCallElim
TailDup
Util	Correctly combine alias.scope metadata by a union instead of intersecting	2015-02-08 17:07:14 +00:00