IVUsers.cpp File Reference

#include "llvm/Analysis/IVUsers.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/CodeMetrics.h"
#include "llvm/Analysis/LoopAnalysisManager.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "iv-users"

Functions
	INITIALIZE_PASS_BEGIN (IVUsersWrapperPass, "iv-users", "Induction Variable Users", false, true) INITIALIZE_PASS_END(IVUsersWrapperPass
static bool	isInteresting (const SCEV *S, const Instruction *I, const Loop *L, ScalarEvolution *SE, LoopInfo *LI)
	isInteresting - Test whether the given expression is "interesting" when used by the given expression, within the context of analyzing the given loop.
static bool	IVUseShouldUsePostIncValue (Instruction *User, Value *Operand, const Loop *L, DominatorTree *DT)
	IVUseShouldUsePostIncValue - We have discovered a "User" of an IV expression and now we need to decide whether the user should use the preinc or post-inc value.
static const SCEVAddRecExpr *	findAddRecForLoop (const SCEV *S, const Loop *L)

Variables
iv	users
iv Induction Variable	Users
iv Induction Variable	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "iv-users"

Definition at line 32 of file IVUsers.cpp.

Function Documentation

findAddRecForLoop()

const SCEVAddRecExpr * findAddRecForLoop ( const SCEV * S, const Loop * L )

static

Definition at line 339 of file IVUsers.cpp.

References llvm::Add, llvm::dyn_cast(), and findAddRecForLoop().

Referenced by findAddRecForLoop(), and llvm::IVUsers::getStride().

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	IVUsersWrapperPass	,
		"iv-users"	,
		"Induction Variable Users"	,
		false	,
		true	)

References INITIALIZE_PASS_DEPENDENCY.

isInteresting()

bool isInteresting ( const SCEV * S, const Instruction * I, const Loop * L, ScalarEvolution * SE, LoopInfo * LI )

static

isInteresting - Test whether the given expression is "interesting" when used by the given expression, within the context of analyzing the given loop.

Definition at line 56 of file IVUsers.cpp.

References llvm::Add, llvm::dyn_cast(), llvm::LoopInfoBase< BlockT, LoopT >::getLoopFor(), llvm::ScalarEvolution::getSCEVAtScope(), I, and isInteresting().

Referenced by llvm::IVUsers::AddUsersIfInteresting(), llvm::ChangeReporter< IRUnitT >::handleIRAfterPass(), isInteresting(), llvm::PrintCrashIRInstrumentation::registerCallbacks(), llvm::ChangeReporter< IRUnitT >::saveIRBeforePass(), and shouldConvertOrWithNoCommonBitsToAdd().

IVUseShouldUsePostIncValue()

bool IVUseShouldUsePostIncValue ( Instruction * User, Value * Operand, const Loop * L, DominatorTree * DT )

static

IVUseShouldUsePostIncValue - We have discovered a "User" of an IV expression and now we need to decide whether the user should use the preinc or post-inc value.

If this user should use the post-inc version of the IV, return true.

Choosing wrong here can break dominance properties (if we choose to use the post-inc value when we cannot) or it can end up adding extra live-ranges to the loop, resulting in reg-reg copies (if we use the pre-inc value when we should use the post-inc value).

Definition at line 97 of file IVUsers.cpp.

References llvm::DominatorTree::dominates(), llvm::dyn_cast(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), and llvm::PHINode::getNumIncomingValues().

Referenced by llvm::IVUsers::AddUsersIfInteresting().

Variable Documentation

false

iv Induction Variable false

Definition at line 49 of file IVUsers.cpp.

Users

iv Induction Variable Users

Definition at line 48 of file IVUsers.cpp.

Referenced by collectUsersRecursively(), createOutlinedFunction(), llvm::DemotePHIToStack(), llvm::findDefsUsedOutsideOfLoop(), llvm::ScalarEvolution::forgetBlockAndLoopDispositions(), insertTrivialPHIs(), isAllocSiteRemovable(), isPossibleIndirectCallTarget(), isProfitableChain(), legalizeAndOptimizeInductions(), llvm::slpvectorizer::BoUpSLP::reorderBottomToTop(), replaceCBufferAccesses(), replaceWithConstant(), llvm::CoroAnnotationElidePass::run(), sink(), llvm::MachineRegisterInfo::updateDbgUsersToReg(), and llvm::InstCombinerImpl::visitAllocSite().

users

iv users

Definition at line 48 of file IVUsers.cpp.

Referenced by computeFunctionSummary(), llvm::AnyCoroIdInst::getCoroAlloc(), llvm::AnyCoroIdInst::getCoroBegin(), llvm::GCStatepointInst::getGCRelocates(), llvm::SelectionDAG::getStackArgumentTokenFactor(), llvm::isInlineViable(), and llvm::VPBlendRecipe::onlyFirstLaneUsed().