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llvm-project/llvm/lib/Transforms/Scalar
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Florian Hahn d95761d9d0 [IPSCCP] Run Solve each time we resolved an undef in a function. 
Once we resolved an undef in a function we can run Solve, which could
lead to finding a constant return value for the function, which in turn
could turn undefs into constants in other functions that call it, before
resolving undefs there.

Computationally the amount of work we are doing stays the same, just the
order we process things is slightly different and potentially there are
a few less undefs to resolve.

We are still relying on the order of functions in the IR, which means
depending on the order, we are able to resolve the optimal undef first
or not. For example, if @test1 comes before @testf, we find the constant
return value of @testf too late and we cannot use it while solving
@test1.

This on its own does not lead to more constants removed in the
test-suite, probably because currently we have to be very lucky to visit
applicable functions in the right order.

Maybe we manage to come up with a better way of resolving undefs in more
'profitable' functions first.

Reviewers: efriedma, mssimpso, davide

Reviewed By: efriedma, davide

Differential Revision: https://reviews.llvm.org/D49385

llvm-svn: 337283
 		2018-07-17 14:04:59 +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] Don't convert a do while loop to ctlz. 2018-07-11 22:35:28 +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 [LSR] If no Use is interesting, early return. 2018-07-13 23:40:00 +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 [IPSCCP] Run Solve each time we resolved an undef in a function. 2018-07-17 14:04:59 +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 unused variable in r336646. 2018-07-10 08:57:04 +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