This file implements transforms for initial VPlan construction. More...

#include "LoopVectorizationPlanner.h"
#include "VPlan.h"
#include "VPlanCFG.h"
#include "VPlanDominatorTree.h"
#include "VPlanPatternMatch.h"
#include "VPlanTransforms.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopIterator.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/IR/MDBuilder.h"

Macros
#define	DEBUG_TYPE "vplan"

Functions
static bool	isHeaderBB (BasicBlock BB, Loop L)
static bool	canonicalHeaderAndLatch (VPBlockBase *HeaderVPB, const VPDominatorTree &VPDT)
	Checks if `HeaderVPB` is a loop header block in the plain CFG; that is, it has exactly 2 predecessors (preheader and latch), where the block dominates the latch and the preheader dominates the block.
static void	createLoopRegion (VPlan &Plan, VPBlockBase *HeaderVPB)
	Create a new VPRegionBlock for the loop starting at `HeaderVPB`.
static void	addCanonicalIVRecipes (VPlan &Plan, VPBasicBlock HeaderVPBB, VPBasicBlock LatchVPBB, Type *IdxTy, DebugLoc DL)
static void	createExtractsForLiveOuts (VPlan &Plan, VPBasicBlock *MiddleVPBB)
	Creates extracts for values in `Plan` defined in a loop region and used outside a loop region.
static void	addInitialSkeleton (VPlan &Plan, Type InductionTy, DebugLoc IVDL, PredicatedScalarEvolution &PSE, Loop TheLoop)

Variables
static constexpr uint32_t	CheckBypassWeights [] = {1, 127}

Detailed Description

This file implements transforms for initial VPlan construction.

Definition in file VPlanConstruction.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE "vplan"

Definition at line 25 of file VPlanConstruction.cpp.

Function Documentation

◆ addCanonicalIVRecipes()

void addCanonicalIVRecipes	(	VPlan &	Plan,
		VPBasicBlock *	HeaderVPBB,
		VPBasicBlock *	LatchVPBB,
		Type *	IdxTy,
		DebugLoc	DL )

static

Definition at line 423 of file VPlanConstruction.cpp.

References llvm::VPBasicBlock::back(), llvm::VPBasicBlock::begin(), llvm::VPInstruction::BranchOnCount, DL, llvm::VPBasicBlock::empty(), llvm::VPRecipeBase::eraseFromParent(), llvm::VPRecipeBase::getDebugLoc(), llvm::VPlan::getOrAddLiveIn(), llvm::VPBasicBlock::getTerminator(), llvm::VPlan::getVectorTripCount(), llvm::VPlan::getVFxUF(), llvm::VPBasicBlock::insert(), llvm::VPlanPatternMatch::m_BranchOnCond(), llvm::VPlanPatternMatch::m_VPValue(), and llvm::PatternMatch::match().

Referenced by addInitialSkeleton().

◆ addInitialSkeleton()

void addInitialSkeleton	(	VPlan &	Plan,
		Type *	InductionTy,
		DebugLoc	IVDL,
		PredicatedScalarEvolution &	PSE,
		Loop *	TheLoop )

static

Definition at line 481 of file VPlanConstruction.cpp.

References addCanonicalIVRecipes(), assert(), canonicalHeaderAndLatch(), llvm::cast(), llvm::VPBlockUtils::connectBlocks(), createExtractsForLiveOuts(), llvm::VPlan::createVPBasicBlock(), llvm::VPlan::getEntry(), llvm::vputils::getOrCreateVPValueForSCEVExpr(), llvm::VPlan::getScalarHeader(), llvm::PredicatedScalarEvolution::getSE(), llvm::VPBlockBase::getSingleSuccessor(), llvm::VPBlockBase::getSuccessors(), llvm::PredicatedScalarEvolution::getSymbolicMaxBackedgeTakenCount(), llvm::ScalarEvolution::getTripCountFromExitCount(), llvm::VPBlockUtils::insertBlockAfter(), llvm::VPBlockUtils::insertOnEdge(), llvm::isa(), llvm::DominatorTreeBase< NodeT, IsPostDom >::recalculate(), llvm::VPlan::setTripCount(), and llvm::VPBlockBase::swapSuccessors().

Referenced by llvm::VPlanTransforms::buildVPlan0().

◆ canonicalHeaderAndLatch()

bool canonicalHeaderAndLatch	(	VPBlockBase *	HeaderVPB,
		const VPDominatorTree &	VPDT )

static

Checks if HeaderVPB is a loop header block in the plain CFG; that is, it has exactly 2 predecessors (preheader and latch), where the block dominates the latch and the preheader dominates the block.

If it is a header block return true and canonicalize the predecessors of the header (making sure the preheader appears first and the latch second) and the successors of the latch (making sure the loop exit comes first). Otherwise return false.

Definition at line 349 of file VPlanConstruction.cpp.

References assert(), llvm::VPInstruction::BranchOnCond, llvm::cast(), llvm::DominatorTreeBase< NodeT, IsPostDom >::dominates(), getOpcode(), llvm::VPBlockBase::getPredecessors(), llvm::VPInstruction::Not, llvm::ArrayRef< T >::size(), std::swap(), and llvm::VPBlockBase::swapPredecessors().

Referenced by addInitialSkeleton(), and llvm::VPlanTransforms::createLoopRegions().