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LLVM
3.7.0
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#include "llvm/Analysis/ScalarEvolutionExpander.h"#include "llvm/ADT/STLExtras.h"#include "llvm/ADT/SmallSet.h"#include "llvm/Analysis/InstructionSimplify.h"#include "llvm/Analysis/LoopInfo.h"#include "llvm/Analysis/TargetTransformInfo.h"#include "llvm/IR/DataLayout.h"#include "llvm/IR/Dominators.h"#include "llvm/IR/IntrinsicInst.h"#include "llvm/IR/LLVMContext.h"#include "llvm/IR/Module.h"#include "llvm/IR/PatternMatch.h"#include "llvm/Support/Debug.h"#include "llvm/Support/raw_ostream.h"Go to the source code of this file.
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| llvm | |
| Compute iterated dominance frontiers using a linear time algorithm. | |
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| static bool | FactorOutConstant (const SCEV *&S, const SCEV *&Remainder, const SCEV *Factor, ScalarEvolution &SE, const DataLayout &DL) |
| FactorOutConstant - Test if S is divisible by Factor, using signed division. More... | |
| static void | SimplifyAddOperands (SmallVectorImpl< const SCEV * > &Ops, Type *Ty, ScalarEvolution &SE) |
| SimplifyAddOperands - Sort and simplify a list of add operands. More... | |
| static void | SplitAddRecs (SmallVectorImpl< const SCEV * > &Ops, Type *Ty, ScalarEvolution &SE) |
| SplitAddRecs - Flatten a list of add operands, moving addrec start values out to the top level. More... | |
| static const Loop * | PickMostRelevantLoop (const Loop *A, const Loop *B, DominatorTree &DT) |
| PickMostRelevantLoop - Given two loops pick the one that's most relevant for SCEV expansion. More... | |
| static void | ExposePointerBase (const SCEV *&Base, const SCEV *&Rest, ScalarEvolution &SE) |
| Move parts of Base into Rest to leave Base with the minimal expression that provides a pointer operand suitable for a GEP expansion. More... | |
| static void | hoistBeforePos (DominatorTree *DT, Instruction *InstToHoist, Instruction *Pos, PHINode *LoopPhi) |
| Hoist the addrec instruction chain rooted in the loop phi above the position. More... | |
| static bool | canBeCheaplyTransformed (ScalarEvolution &SE, const SCEVAddRecExpr *Phi, const SCEVAddRecExpr *Requested, bool &InvertStep) |
| Check whether we can cheaply express the requested SCEV in terms of the available PHI SCEV by truncation and/or invertion of the step. More... | |
| static bool | IsIncrementNSW (ScalarEvolution &SE, const SCEVAddRecExpr *AR) |
| static bool | IsIncrementNUW (ScalarEvolution &SE, const SCEVAddRecExpr *AR) |
| bool | llvm::isSafeToExpand (const SCEV *S, ScalarEvolution &SE) |
| Return true if the given expression is safe to expand in the sense that all materialized values are safe to speculate. More... | |
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Check whether we can cheaply express the requested SCEV in terms of the available PHI SCEV by truncation and/or invertion of the step.
Definition at line 1006 of file ScalarEvolutionExpander.cpp.
References llvm::dyn_cast(), llvm::ScalarEvolution::getAddExpr(), llvm::ScalarEvolution::getEffectiveSCEVType(), llvm::Type::getIntegerBitWidth(), llvm::ScalarEvolution::getNegativeSCEV(), llvm::SCEVAddRecExpr::getStart(), llvm::ScalarEvolution::getTruncateOrNoop(), and llvm::SCEVNAryExpr::getType().
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Move parts of Base into Rest to leave Base with the minimal expression that provides a pointer operand suitable for a GEP expansion.
Definition at line 804 of file ScalarEvolutionExpander.cpp.
References llvm::ARM_PROC::A, llvm::SmallVectorTemplateCommon< T, typename >::back(), llvm::SCEV::FlagNW, llvm::ScalarEvolution::getAddExpr(), llvm::ScalarEvolution::getAddRecExpr(), and llvm::ScalarEvolution::getConstant().
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FactorOutConstant - Test if S is divisible by Factor, using signed division.
If so, update S with Factor divided out and return true. S need not be evenly divisible if a reasonable remainder can be computed. TODO: When ScalarEvolution gets a SCEVSDivExpr, this can be made unnecessary; in its place, just signed-divide Ops[i] by the scale and check to see if the divide was folded.
Definition at line 211 of file ScalarEvolutionExpander.cpp.
References llvm::ARM_PROC::A, R600_InstFlag::FC, llvm::SCEV::FlagNW, llvm::ConstantInt::get(), llvm::ScalarEvolution::getAddExpr(), llvm::ScalarEvolution::getAddRecExpr(), llvm::ScalarEvolution::getConstant(), llvm::ScalarEvolution::getContext(), llvm::ScalarEvolution::getMulExpr(), llvm::SCEV::getType(), llvm::SCEVConstant::getValue(), llvm::ConstantInt::getValue(), llvm::SCEV::isOne(), llvm::SCEV::isZero(), and llvm::ConstantInt::isZero().
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Hoist the addrec instruction chain rooted in the loop phi above the position.
This routine assumes that this is possible (has been checked).
Definition at line 991 of file ScalarEvolutionExpander.cpp.
References llvm::DominatorTree::dominates(), llvm::User::getOperand(), and llvm::Instruction::moveBefore().
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PickMostRelevantLoop - Given two loops pick the one that's most relevant for SCEV expansion.
If they are nested, this is the most nested. If they are neighboring, pick the later.
Definition at line 581 of file ScalarEvolutionExpander.cpp.
References llvm::ARM_PROC::A, llvm::LoopBase< N, M >::contains(), llvm::DominatorTree::dominates(), and llvm::LoopBase< N, M >::getHeader().
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SimplifyAddOperands - Sort and simplify a list of add operands.
NumAddRecs is the number of SCEVAddRecExprs present, which are kept at the end of the list.
Definition at line 289 of file ScalarEvolutionExpander.cpp.
References llvm::SmallVectorImpl< T >::append(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::SmallVectorImpl< T >::clear(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::ScalarEvolution::getAddExpr(), llvm::ScalarEvolution::getConstant(), llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), and llvm::SmallVectorTemplateCommon< T >::size().
Referenced by SplitAddRecs().
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SplitAddRecs - Flatten a list of add operands, moving addrec start values out to the top level.
For example, convert {a + b,+,c} to a, b, {0,+,d}. This helps expose more opportunities for folding parts of the expressions into GEP indices.
Definition at line 318 of file ScalarEvolutionExpander.cpp.
References llvm::ARM_PROC::A, llvm::SmallVectorImpl< T >::append(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::SCEV::FlagNW, llvm::ScalarEvolution::getAddRecExpr(), llvm::ScalarEvolution::getConstant(), llvm::SCEV::isZero(), llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), SimplifyAddOperands(), and llvm::SmallVectorTemplateCommon< T >::size().
1.8.6