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Hal Finkel 56525dc578 Make use @llvm.assume for loop guards in ScalarEvolution

This adds a basic (but important) use of @llvm.assume calls in ScalarEvolution.
When SE is attempting to validate a condition guarding a loop (such as whether
or not the loop count can be zero), this check should also include dominating
assumptions.

llvm-svn: 217348

2014-09-07 21:37:59 +00:00

IPA

Add functions for finding ephemeral values

2014-09-07 13:49:57 +00:00

AliasAnalysis.cpp

AA metadata refactoring (introduce AAMDNodes)

2014-07-24 12:16:19 +00:00

AliasAnalysisCounter.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

AliasAnalysisEvaluator.cpp

AA metadata refactoring (introduce AAMDNodes)

2014-07-24 12:16:19 +00:00

AliasDebugger.cpp

[C++11] Add 'override' keyword to virtual methods that override their base class.

2014-03-05 07:30:04 +00:00

AliasSetTracker.cpp

AA metadata refactoring (introduce AAMDNodes)

2014-07-24 12:16:19 +00:00

Analysis.cpp

Add a CFL Alias Analysis implementation

2014-09-02 21:43:13 +00:00

AssumptionTracker.cpp

Add an Assumption-Tracking Pass

2014-09-07 12:44:26 +00:00

BasicAliasAnalysis.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

BlockFrequencyInfo.cpp

Revert "Introduce a string_ostream string builder facilty"

2014-06-26 22:52:05 +00:00

BlockFrequencyInfoImpl.cpp

BFI: Add constructor for Weight

2014-07-12 00:26:00 +00:00

BranchProbabilityInfo.cpp

Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."

2014-07-21 17:06:51 +00:00

CaptureTracking.cpp

Match semantics of PointerMayBeCapturedBefore to its name by default

2014-07-21 21:30:22 +00:00

CFG.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

CFGPrinter.cpp

Modernize raw_fd_ostream's constructor a bit.

2014-08-25 18:16:47 +00:00

CFLAliasAnalysis.cpp

[CFLAA] Remove one final initializer list

2014-09-03 00:06:47 +00:00

CGSCCPassManager.cpp

[PM] Add a new-PM-style CGSCC pass manager using the newly added

2014-04-21 11:12:00 +00:00

CMakeLists.txt

Add an Assumption-Tracking Pass

2014-09-07 12:44:26 +00:00

CodeMetrics.cpp

Add functions for finding ephemeral values

2014-09-07 13:49:57 +00:00

ConstantFolding.cpp

Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.

2014-08-21 05:55:13 +00:00

CostModel.cpp

[CostModel][x86] Improved cost model for alternate shuffles.

2014-07-03 22:24:18 +00:00

Delinearization.cpp

remove BasePointer before delinearizing

2014-05-27 22:41:51 +00:00

DependenceAnalysis.cpp

Analysis: cleanup

2014-08-26 02:03:40 +00:00

DominanceFrontier.cpp

Templatify DominanceFrontier.

2014-07-12 21:59:52 +00:00

DomPrinter.cpp

[PM] Split DominatorTree into a concrete analysis result object which

2014-01-13 13:07:17 +00:00

InstCount.cpp

[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE

2014-04-22 02:48:03 +00:00

InstructionSimplify.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

Interval.cpp

Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."

2014-07-21 17:06:51 +00:00

IntervalPartition.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

IVUsers.cpp

Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.

2014-08-21 05:55:13 +00:00

JumpInstrTableInfo.cpp

Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.

2014-06-05 19:29:43 +00:00

LazyCallGraph.cpp

Fix typos

2014-05-15 01:52:21 +00:00

LazyValueInfo.cpp

Make use of @llvm.assume from LazyValueInfo

2014-09-07 20:29:59 +00:00

LibCallAliasAnalysis.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

LibCallSemantics.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

Lint.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

LLVMBuild.txt

LLVMBuild: Introduce a common section which currently has a list of the

2011-12-12 22:45:54 +00:00

Loads.cpp

AA metadata refactoring (introduce AAMDNodes)

2014-07-24 12:16:19 +00:00

LoopInfo.cpp

Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."

2014-07-21 17:06:51 +00:00

LoopPass.cpp

Add back functionality removed in r210497.

2014-06-21 02:43:02 +00:00

Makefile

…

MemDepPrinter.cpp

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 04:59:12 +00:00

MemoryBuiltins.cpp

[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE

2014-04-22 02:48:03 +00:00

MemoryDependenceAnalysis.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

ModuleDebugInfoPrinter.cpp

[C++11] Change DebugInfoFinder to use range-based loops

2014-03-18 09:41:07 +00:00

NoAliasAnalysis.cpp

Improve BasicAA CS-CS queries (redux)

2014-07-17 01:28:25 +00:00

PHITransAddr.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

PostDominators.cpp

[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE

2014-04-22 02:48:03 +00:00

PtrUseVisitor.cpp

[C++11] Add range based accessors for the Use-Def chain of a Value.

2014-03-09 03:16:01 +00:00

README.txt

…

RegionInfo.cpp

Fix msc17 build. RegionInfo::RegionInfo::recalculate() doesn't make sense.

2014-07-20 03:57:51 +00:00

RegionPass.cpp

Templatify RegionInfo so it works on MachineBasicBlocks

2014-07-19 18:29:29 +00:00

RegionPrinter.cpp

Templatify RegionInfo so it works on MachineBasicBlocks

2014-07-19 18:29:29 +00:00

ScalarEvolution.cpp

Make use @llvm.assume for loop guards in ScalarEvolution

2014-09-07 21:37:59 +00:00

ScalarEvolutionAliasAnalysis.cpp

AA metadata refactoring (introduce AAMDNodes)

2014-07-24 12:16:19 +00:00

ScalarEvolutionExpander.cpp

Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

2014-09-07 18:57:58 +00:00

ScalarEvolutionNormalization.cpp

Fix typos in comments, NFC

2014-08-29 21:53:01 +00:00

ScopedNoAliasAA.cpp

Add override to overriden virtual methods, remove virtual keywords.

2014-09-03 11:41:21 +00:00

SparsePropagation.cpp

[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE

2014-04-22 02:48:03 +00:00

StratifiedSets.h

[CFLAA] And even more MSVC fixes

2014-09-02 23:50:01 +00:00

TargetTransformInfo.cpp

Remove 'virtual' keyword from methods markedwith 'override' keyword.

2014-08-30 16:48:34 +00:00

Trace.cpp

Put the functionality for printing a value to a raw_ostream as an

2014-01-09 02:29:41 +00:00

TypeBasedAliasAnalysis.cpp

Add scoped-noalias metadata

2014-07-24 14:25:39 +00:00

ValueTracking.cpp

Add additional patterns for @llvm.assume in ValueTracking

2014-09-07 19:21:07 +00:00

README.txt

Analysis Opportunities:

//===---------------------------------------------------------------------===//

In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
ScalarEvolution expression for %r is this:

  {1,+,3,+,2}<loop>

Outside the loop, this could be evaluated simply as (%n * %n), however
ScalarEvolution currently evaluates it as

  (-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))

In addition to being much more complicated, it involves i65 arithmetic,
which is very inefficient when expanded into code.

//===---------------------------------------------------------------------===//

In formatValue in test/CodeGen/X86/lsr-delayed-fold.ll,

ScalarEvolution is forming this expression:

((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32)))

This could be folded to

(-1 * (trunc i64 undef to i32))

//===---------------------------------------------------------------------===//