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Philip Reames eb88badff9 Fix a bug w/inbounds invalidation in LFTR 
This contains fixes for two cases where we might invalidate inbounds and leave it stale in the IR (a miscompile). Case 1 is when switching to an IV with no dynamically live uses, and case 2 is when doing pre-to-post conversion on the same pointer type IV.

The basic scheme used is to prove that using the given IV (pre or post increment forms) would have to already trigger UB on the path to the test we're modifying.  As such, our potential UB triggering use does not change the semantics of the original program.

As was pointed out in the review thread by Nikita, this is defending against a separate issue from the hasConcreteDef case. This is about poison, that's about undef. Unfortunately, the two are different, see Nikita's comment for a fuller explanation, he explains it well.

(Note: I'm going to address Nikita's last style comment in a separate commit just to minimize chance of subtle bugs being introduced due to typos.)

Differential Revision: https://reviews.llvm.org/D62939

llvm-svn: 363289
 		2019-06-13 18:23:13 +00:00
..
ADCE Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
AddDiscriminators Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
AggressiveInstCombine Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
AlignmentFromAssumptions Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ArgumentPromotion remove inalloca parameters in globalopt and simplify argpromotion 2019-05-02 00:37:36 +00:00
AtomicExpand AtomicExpand: Don't crash on non-0 alloca 2019-06-11 01:35:07 +00:00
BDCE Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
BlockExtractor [BlockExtractor] Change the basic block separator from ',' to ';' 2019-04-29 16:14:00 +00:00
BranchFolding Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
CallSiteSplitting CallSiteSplitting: Respect convergent and noduplicate 2019-05-29 16:59:48 +00:00
CalledValuePropagation Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
CanonicalizeAliases Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
CodeExtractor Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
CodeGenPrepare [x86] add tests for vector shifts; NFC 2019-06-12 21:30:06 +00:00
ConstProp Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ConstantHoisting Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ConstantMerge Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Coroutines [coroutines] Fix spills of static array allocas 2019-05-13 23:58:24 +00:00
CorrelatedValuePropagation Resubmit "[CorrelatedValuePropagation] Fix prof branch_weights metadata handling for SwitchInst" 2019-06-05 05:46:40 +00:00
CrossDSOCFI Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
DCE Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
DeadArgElim Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
DeadStoreElimination [DSE] Bugfix to avoid PartialStoreMerging involving non byte-sized stores 2019-05-24 08:32:02 +00:00
DivRemPairs Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
EarlyCSE [EarlyCSE] Ensure equal keys have the same hash value 2019-06-13 15:24:11 +00:00
EliminateAvailableExternally Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
EntryExitInstrumenter Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ExpandMemCmp/X86 Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Float2Int Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ForcedFunctionAttrs Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
FunctionAttrs Do not derive no-recurse attribute if function does not have exact definition. 2019-06-10 04:16:04 +00:00
FunctionImport Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GCOVProfiling Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GVN GVN: Handle addrspacecast 2019-05-18 14:36:06 +00:00
GVNHoist Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GVNSink Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GlobalDCE [IR] Disallow llvm.global_ctors and llvm.global_dtors of the 2-field form in textual format 2019-05-15 02:35:32 +00:00
GlobalMerge Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GlobalOpt Revert r361460 2019-05-24 01:03:51 +00:00
GlobalSplit Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
GuardWidening [GuardWidening] Wire up a NPM version of the LoopGuardWidening pass 2019-04-18 19:17:14 +00:00
HardwareLoops [ARM][TTI] Scan for existing loop intrinsics 2019-06-13 08:28:46 +00:00
HotColdSplit Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
IPConstantProp Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
IRCE Revert "[SCEV] Use wrap flags in InsertBinop" 2019-06-06 12:35:46 +00:00
IndVarSimplify Fix a bug w/inbounds invalidation in LFTR 2019-06-13 18:23:13 +00:00
IndirectBrExpand Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
InferAddressSpaces [InferAddressSpaces] Enhance the handling of cosntexpr. 2019-05-10 14:57:42 +00:00
InferFunctionAttrs Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Inline [NFC] Added test from PR42084 for D63058 2019-06-09 14:56:46 +00:00
InstCombine [InstCombine] auto-generate complete test checks; NFC 2019-06-13 18:14:49 +00:00
InstMerge Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
InstNamer Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
InstSimplify [InstSimplify] enhance fcmp fold with never-nan operand 2019-06-09 13:48:59 +00:00
InterleavedAccess Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Internalize Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
JumpThreading [JumpThreading] A bug fix for stale loop info after unfold select 2019-05-15 15:15:16 +00:00
LCSSA Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LICM [LICM] Allow AliasSetMap to contain top-level loops. 2019-05-14 19:41:36 +00:00
LoadStoreVectorizer Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopDataPrefetch Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopDeletion Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopDistribute LoopDistribute/LAA: Respect convergent 2019-06-12 13:34:19 +00:00
LoopFusion Add basic loop fusion pass. 2019-04-17 18:53:27 +00:00
LoopIdiom Revert "[DebugInfo@O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion" 2019-06-12 08:34:51 +00:00
LoopInstSimplify Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopInterchange [LoopInterchange] Fix handling of LCSSA nodes defined in headers and latches. 2019-05-26 23:38:25 +00:00
LoopLoadElim LoopLoadElim: Respect convergent 2019-06-12 13:50:47 +00:00
LoopPredication [LoopPred] Fix a bug in unconditional latch bailout introduced in r362284 2019-06-06 18:02:36 +00:00
LoopReroll Revert "[SCEV] Use wrap flags in InsertBinop" 2019-06-06 12:35:46 +00:00
LoopRotate Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopSimplify Revert "[DebugInfo@O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion" 2019-06-12 08:34:51 +00:00
LoopSimplifyCFG Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopStrengthReduce [NFC] Updated testcase for D54411/rL363284 2019-06-13 18:13:03 +00:00
LoopTransformWarning Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopUnroll Revert "[DebugInfo@O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion" 2019-06-12 08:34:51 +00:00
LoopUnrollAndJam Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopUnswitch Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LoopVectorize Improve reduction intrinsics by overloading result value. 2019-06-13 09:37:38 +00:00
LoopVersioning LoopVersioning: Respect convergent 2019-06-12 14:05:58 +00:00
LoopVersioningLICM LoopVersioningLICM: Respect convergent and noduplicate 2019-05-29 20:47:59 +00:00
LowerAtomic Transforms: lower fadd and fsub atomicrmw instructions 2019-05-23 17:03:43 +00:00
LowerExpectIntrinsic Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LowerGuardIntrinsic Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LowerInvoke Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
LowerSwitch Fix a crash when the default of a switch is removed 2019-06-03 17:54:15 +00:00
LowerTypeTests [ThinLTO] Auto-hide prevailing linkonce_odr only when all copies eligible 2019-05-10 20:08:24 +00:00
LowerWidenableCondition Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
MakeGuardsExplicit Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Mem2Reg Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
MemCpyOpt Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
MergeFunc Fix 2-field llvm.global_ctors `REQUIRES: asserts` tests after rL360742 2019-05-15 03:08:21 +00:00
MergeICmps [MergeICmps] Make the pass compatible with the new pass manager. 2019-05-23 12:35:26 +00:00
MetaRenamer Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
NameAnonGlobals Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
NaryReassociate Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
NewGVN NewGVN: Handle addrspacecast 2019-06-05 21:15:52 +00:00
ObjCARC [IR] Disallow llvm.global_ctors and llvm.global_dtors of the 2-field form in textual format 2019-05-15 02:35:32 +00:00
PGOProfile [PGO] Handle cases of non-instrument BBs 2019-06-10 22:36:27 +00:00
PartiallyInlineLibCalls Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
PhaseOrdering [Pass Pipeline][NFC] Add a test prior to committing D61726 2019-05-13 21:14:36 +00:00
PlaceSafepoints Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
PreISelIntrinsicLowering Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
PruneEH Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Reassociate [NFC][Reassociate] Fix mistake in 468b2ad 2019-06-05 18:50:07 +00:00
Reg2Mem Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
RewriteStatepointsForGC Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
SCCP [SCCP] Add UnaryOperator visitor to SCCP for unary FNeg 2019-06-03 21:53:56 +00:00
SLPVectorizer Improve reduction intrinsics by overloading result value. 2019-06-13 09:37:38 +00:00
SROA Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
SafeStack Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
SampleProfile Fix prof branch_weights in entry_counts_missing_dbginfo.ll test 2019-05-16 03:39:09 +00:00
ScalarizeMaskedMemIntrin/X86 Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Scalarizer [Scalarizer] Add UnaryOperator visitor to scalarization pass 2019-06-04 23:01:36 +00:00
SeparateConstOffsetFromGEP Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
SimpleLoopUnswitch [NewPM] Add Option handling for SimpleLoopUnswitch 2019-04-22 10:35:07 +00:00
SimplifyCFG [SimplifyCFG] reverting preliminary Switch patches again 2019-06-13 05:26:17 +00:00
Sink Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
SpeculateAroundPHIs SpeculateAroundPHIs: Respect convergent 2019-05-29 13:14:39 +00:00
SpeculativeExecution Support FNeg in SpeculativeExecution pass 2019-05-14 16:51:18 +00:00
StackProtector/X86 StackProtector: Use PointerMayBeCaptured 2019-06-12 14:23:33 +00:00
StraightLineStrengthReduce Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
StripDeadPrototypes Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
StripSymbols Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
StructurizeCFG StructurizeCFG: Relax uniformity checks. 2019-05-24 08:59:17 +00:00
SyntheticCountsPropagation Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
TailCallElim Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ThinLTOBitcodeWriter [IR] Disallow llvm.global_ctors and llvm.global_dtors of the 2-field form in textual format 2019-05-15 02:35:32 +00:00
Util [PredicateInfo] Do not process unreachable operands. 2019-05-15 19:35:38 +00:00
WholeProgramDevirt [ThinLTO] Auto-hide prevailing linkonce_odr only when all copies eligible 2019-05-10 20:08:24 +00:00