LLVM  8.0.0svn
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llvm::LoopVectorizationPlanner Class Reference

Planner drives the vectorization process after having passed Legality checks. More...

#include "Transforms/Vectorize/LoopVectorizationPlanner.h"

Public Member Functions

 LoopVectorizationPlanner (Loop *L, LoopInfo *LI, const TargetLibraryInfo *TLI, const TargetTransformInfo *TTI, LoopVectorizationLegality *Legal, LoopVectorizationCostModel &CM)
 
VectorizationFactor plan (bool OptForSize, unsigned UserVF)
 Plan how to best vectorize, return the best VF and its cost. More...
 
VectorizationFactor planInVPlanNativePath (bool OptForSize, unsigned UserVF)
 Use the VPlan-native path to plan how to best vectorize, return the best VF and its cost. More...
 
void setBestPlan (unsigned VF, unsigned UF)
 Finalize the best decision and dispose of all other VPlans. More...
 
void executePlan (InnerLoopVectorizer &LB, DominatorTree *DT)
 Generate the IR code for the body of the vectorized loop according to the best selected VPlan. More...
 
void printPlans (raw_ostream &O)
 

Static Public Member Functions

static bool getDecisionAndClampRange (const std::function< bool(unsigned)> &Predicate, VFRange &Range)
 Test a Predicate on a Range of VF's. More...
 

Protected Member Functions

void collectTriviallyDeadInstructions (SmallPtrSetImpl< Instruction *> &DeadInstructions)
 Collect the instructions from the original loop that would be trivially dead in the vectorized loop if generated. More...
 
void buildVPlans (unsigned MinVF, unsigned MaxVF)
 Build VPlans for power-of-2 VF's between MinVF and MaxVF inclusive, according to the information gathered by Legal when it checked if it is legal to vectorize the loop. More...
 

Detailed Description

Planner drives the vectorization process after having passed Legality checks.

Definition at line 179 of file LoopVectorizationPlanner.h.

Constructor & Destructor Documentation

◆ LoopVectorizationPlanner()

llvm::LoopVectorizationPlanner::LoopVectorizationPlanner ( Loop L,
LoopInfo LI,
const TargetLibraryInfo TLI,
const TargetTransformInfo TTI,
LoopVectorizationLegality Legal,
LoopVectorizationCostModel CM 
)
inline

Definition at line 219 of file LoopVectorizationPlanner.h.

Member Function Documentation

◆ buildVPlans()

void LoopVectorizationPlanner::buildVPlans ( unsigned  MinVF,
unsigned  MaxVF 
)
protected

Build VPlans for power-of-2 VF's between MinVF and MaxVF inclusive, according to the information gathered by Legal when it checked if it is legal to vectorize the loop.

Build VPlans for the full range of feasible VF's = {MinVF, 2 * MinVF, 4 * MinVF, ..., MaxVF} by repeatedly building a VPlan for a sub-range of VF's starting at a given VF and extending it as much as possible.

Each vectorization decision can potentially shorten this sub-range during buildVPlan().

Definition at line 6299 of file LoopVectorize.cpp.

References llvm::VFRange::End, and llvm::InnerLoopVectorizer::VF.

◆ collectTriviallyDeadInstructions()

void LoopVectorizationPlanner::collectTriviallyDeadInstructions ( SmallPtrSetImpl< Instruction *> &  DeadInstructions)
protected

◆ executePlan()

void LoopVectorizationPlanner::executePlan ( InnerLoopVectorizer LB,
DominatorTree DT 
)

◆ getDecisionAndClampRange()

bool LoopVectorizationPlanner::getDecisionAndClampRange ( const std::function< bool(unsigned)> &  Predicate,
VFRange Range 
)
static

Test a Predicate on a Range of VF's.

Return the value of applying Predicate on Range.Start, possibly decreasing Range.End such that the returned value holds for the entire Range.

Definition at line 6280 of file LoopVectorize.cpp.

References assert(), llvm::VFRange::End, and llvm::VFRange::Start.

Referenced by llvm::VPRecipeBuilder::handleReplication(), llvm::VPRecipeBuilder::tryToInterleaveMemory(), llvm::VPRecipeBuilder::tryToOptimizeInduction(), llvm::VPRecipeBuilder::tryToWiden(), and llvm::VPRecipeBuilder::tryToWidenMemory().

◆ plan()

VectorizationFactor LoopVectorizationPlanner::plan ( bool  OptForSize,
unsigned  UserVF 
)

◆ planInVPlanNativePath()

VectorizationFactor LoopVectorizationPlanner::planInVPlanNativePath ( bool  OptForSize,
unsigned  UserVF 
)

Use the VPlan-native path to plan how to best vectorize, return the best VF and its cost.

Definition at line 6059 of file LoopVectorize.cpp.

References assert(), llvm::dbgs(), llvm::LoopBase< BlockT, LoopT >::empty(), EnableVPlanNativePath, llvm::isPowerOf2_32(), LLVM_DEBUG, llvm::InnerLoopVectorizer::OrigLoop, and VPlanBuildStressTest.

Referenced by processLoopInVPlanNativePath().

◆ printPlans()

void llvm::LoopVectorizationPlanner::printPlans ( raw_ostream O)
inline

Definition at line 239 of file LoopVectorizationPlanner.h.

References function.

◆ setBestPlan()

void LoopVectorizationPlanner::setBestPlan ( unsigned  VF,
unsigned  UF 
)

Finalize the best decision and dispose of all other VPlans.

Definition at line 6146 of file LoopVectorize.cpp.

References assert(), llvm::dbgs(), llvm::erase_if(), LLVM_DEBUG, llvm::InnerLoopVectorizer::UF, and llvm::InnerLoopVectorizer::VF.

Referenced by llvm::LoopVectorizePass::processLoop(), and processLoopInVPlanNativePath().


The documentation for this class was generated from the following files: