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llvm-project/llvm/lib/Transforms/Scalar
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Manoj Gupta 77eeac3d9e llvm: Add support for "-fno-delete-null-pointer-checks" 
Summary:
Support for this option is needed for building Linux kernel.
This is a very frequently requested feature by kernel developers.

More details : https://lkml.org/lkml/2018/4/4/601

GCC option description for -fdelete-null-pointer-checks:
This Assume that programs cannot safely dereference null pointers,
and that no code or data element resides at address zero.

-fno-delete-null-pointer-checks is the inverse of this implying that
null pointer dereferencing is not undefined.

This feature is implemented in LLVM IR in this CL as the function attribute
"null-pointer-is-valid"="true" in IR (Under review at D47894).
The CL updates several passes that assumed null pointer dereferencing is
undefined to not optimize when the "null-pointer-is-valid"="true"
attribute is present.

Reviewers: t.p.northover, efriedma, jyknight, chandlerc, rnk, srhines, void, george.burgess.iv

Reviewed By: efriedma, george.burgess.iv

Subscribers: eraman, haicheng, george.burgess.iv, drinkcat, theraven, reames, sanjoy, xbolva00, llvm-commits

Differential Revision: https://reviews.llvm.org/D47895

llvm-svn: 336613
 		2018-07-09 22:27:23 +00:00
..
ADCE.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
AlignmentFromAssumptions.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
BDCE.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
CMakeLists.txt [UnrollAndJam] New Unroll and Jam pass 2018-07-01 12:47:30 +00:00
CallSiteSplitting.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
ConstantHoisting.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
ConstantProp.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
CorrelatedValuePropagation.cpp CorrelatedValuePropagation: Preserve DT. 2018-06-16 18:57:31 +00:00
DCE.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
DeadStoreElimination.cpp llvm: Add support for "-fno-delete-null-pointer-checks" 2018-07-09 22:27:23 +00:00
DivRemPairs.cpp [DivRemPairs] Fix non-determinism in use list order. 2018-04-25 02:17:56 +00:00
EarlyCSE.cpp [EarlyCSE] Fix MSVC build. NFCI. 2018-06-14 14:22:03 +00:00
FlattenCFGPass.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
Float2Int.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
GVN.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
GVNHoist.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
GVNSink.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
GuardWidening.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
IVUsersPrinter.cpp
…
IndVarSimplify.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
InductiveRangeCheckElimination.cpp [IRCE] Fix miscompile with range checks against negative values 2018-05-19 13:06:37 +00:00
InferAddressSpaces.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
InstSimplifyPass.cpp [instsimplify] Move the instsimplify pass to use more obvious file names 2018-06-29 23:36:03 +00:00
JumpThreading.cpp Revert r332168: "Reapply "[PR16756] Use SSAUpdaterBulk in JumpThreading."" 2018-07-05 22:10:31 +00:00
LICM.cpp Replace "Replacable" with "Replaceable". [NFC] 2018-07-02 18:53:40 +00:00
LLVMBuild.txt Another try to commit 323321 (aggressive instruction combine). 2018-01-25 12:06:32 +00:00
LoopAccessAnalysisPrinter.cpp
…
LoopDataPrefetch.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
LoopDeletion.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
LoopDistribute.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
LoopIdiomRecognize.cpp [LoopIdiomRecognize] Support for converting loops that use LSHR to CTLZ. 2018-07-08 01:45:47 +00:00
LoopInstSimplify.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
LoopInterchange.cpp [LoopInterchange] Move PHI handling to adjustLoopBranches. 2018-06-19 08:03:24 +00:00
LoopLoadElimination.cpp Use SmallPtrSet explicitly for SmallSets with pointer types (NFC). 2018-06-12 11:16:56 +00:00
LoopPassManager.cpp
…
LoopPredication.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
LoopRerollPass.cpp [LoopReroll] Rewrite induction variable rewriting. 2018-06-22 22:58:55 +00:00
LoopRotation.cpp Refine the loop rotation's API 2018-04-19 20:29:43 +00:00
LoopSimplifyCFG.cpp Generalize MergeBlockIntoPredecessor. Replace uses of MergeBasicBlockIntoOnlyPred. 2018-06-20 22:01:04 +00:00
LoopSink.cpp [LoopSink] Make the enforcement of determinism deterministic. 2018-07-06 14:20:58 +00:00
LoopStrengthReduce.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
LoopUnrollAndJamPass.cpp [UnrollAndJam] New Unroll and Jam pass 2018-07-01 12:47:30 +00:00
LoopUnrollPass.cpp [UnrollAndJam] New Unroll and Jam pass 2018-07-01 12:47:30 +00:00
LoopUnswitch.cpp [LoopUnswitch]Fix comparison for DomTree updates. 2018-06-22 17:14:35 +00:00
LoopVersioningLICM.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
LowerAtomic.cpp Remove redundant includes from lib/Transforms. 2017-12-13 21:31:01 +00:00
LowerExpectIntrinsic.cpp Remove \brief commands from doxygen comments. 2018-05-01 15:54:18 +00:00
LowerGuardIntrinsic.cpp Sort the remaining #include lines in include/... and lib/.... 2017-06-06 11:49:48 +00:00
MemCpyOptimizer.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
MergeICmps.cpp [MergeICmps] Don't crash when memcmp is not available 2018-05-19 12:51:59 +00:00
MergedLoadStoreMotion.cpp [STLExtras] Add size() for ranges, and remove distance() 2018-05-16 23:20:42 +00:00
NaryReassociate.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
NewGVN.cpp Revert "Extend CFGPrinter and CallPrinter with Heat Colors" 2018-06-29 17:48:58 +00:00
PartiallyInlineLibCalls.cpp [PartiallyInlineLibCalls][x86] add TTI hook to allow sqrt inlining to depend on arg rather than result 2017-11-27 21:15:43 +00:00
PlaceSafepoints.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
Reassociate.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
Reg2Mem.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
RewriteStatepointsForGC.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
SCCP.cpp llvm: Add support for "-fno-delete-null-pointer-checks" 2018-07-09 22:27:23 +00:00
SROA.cpp [SROA] Preserve DebugLoc when rewriting alloca partitions 2018-06-28 18:58:30 +00:00
Scalar.cpp [UnrollAndJam] New Unroll and Jam pass 2018-07-01 12:47:30 +00:00
Scalarizer.cpp [Transforms] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-10-20 21:47:29 +00:00
SeparateConstOffsetFromGEP.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
SimpleLoopUnswitch.cpp [PM/Unswitch] Fix a nasty bug in the new PM's unswitch introduced in 2018-07-09 10:30:48 +00:00
SimplifyCFGPass.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
Sink.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00
SpeculateAroundPHIs.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
SpeculativeExecution.cpp Use SmallPtrSet explicitly for SmallSets with pointer types (NFC). 2018-06-12 11:16:56 +00:00
StraightLineStrengthReduce.cpp Move Analysis/Utils/Local.h back to Transforms 2018-06-04 21:23:21 +00:00
StructurizeCFG.cpp [NFC] fix trivial typos in comments 2018-06-14 05:41:49 +00:00
TailRecursionElimination.cpp Rename DEBUG macro to LLVM_DEBUG. 2018-05-14 12:53:11 +00:00