InstCombineAndOrXor.cpp File Reference

#include "InstCombineInternal.h"
#include "llvm/Analysis/CmpInstAnalysis.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Transforms/InstCombine/InstCombiner.h"
#include "llvm/Transforms/Utils/Local.h"

Go to the source code of this file.

Classes
struct	IntPart

Macros
#define	DEBUG_TYPE   "instcombine"

Enumerations
enum	MaskedICmpType {   AMask_AllOnes = 1 , AMask_NotAllOnes = 2 , BMask_AllOnes = 4 , BMask_NotAllOnes = 8 ,   Mask_AllZeros = 16 , Mask_NotAllZeros = 32 , AMask_Mixed = 64 , AMask_NotMixed = 128 ,   BMask_Mixed = 256 , BMask_NotMixed = 512 }
	Classify (icmp eq (A & B), C) and (icmp ne (A & B), C) as matching patterns that can be simplified. More...

Functions
static Value *	getNewICmpValue (unsigned Code, bool Sign, Value *LHS, Value *RHS, InstCombiner::BuilderTy &Builder)
	This is the complement of getICmpCode, which turns an opcode and two operands into either a constant true or false, or a brand new ICmp instruction.
static Value *	getFCmpValue (unsigned Code, Value *LHS, Value *RHS, InstCombiner::BuilderTy &Builder)
	This is the complement of getFCmpCode, which turns an opcode and two operands into either a FCmp instruction, or a true/false constant.
static unsigned	getMaskedICmpType (Value *A, Value *B, Value *C, ICmpInst::Predicate Pred)
	Return the set of patterns (from MaskedICmpType) that (icmp SCC (A & B), C) satisfies.
static unsigned	conjugateICmpMask (unsigned Mask)
	Convert an analysis of a masked ICmp into its equivalent if all boolean operations had the opposite sense.
static bool	decomposeBitTestICmp (Value *LHS, Value *RHS, CmpInst::Predicate &Pred, Value *&X, Value *&Y, Value *&Z)
static std::optional< std::pair< unsigned, unsigned > >	getMaskedTypeForICmpPair (Value *&A, Value *&B, Value *&C, Value *&D, Value *&E, ICmpInst *LHS, ICmpInst *RHS, ICmpInst::Predicate &PredL, ICmpInst::Predicate &PredR)
	Handle (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E).
static Value *	foldLogOpOfMaskedICmps_NotAllZeros_BMask_Mixed (ICmpInst *LHS, ICmpInst *RHS, bool IsAnd, Value *A, Value *B, Value *D, Value *E, ICmpInst::Predicate PredL, ICmpInst::Predicate PredR, InstCombiner::BuilderTy &Builder)
	Try to fold (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y), where the left-hand side is of type Mask_NotAllZeros and the right hand side is of type BMask_Mixed.
static Value *	foldLogOpOfMaskedICmpsAsymmetric (ICmpInst *LHS, ICmpInst *RHS, bool IsAnd, Value *A, Value *B, Value *C, Value *D, Value *E, ICmpInst::Predicate PredL, ICmpInst::Predicate PredR, unsigned LHSMask, unsigned RHSMask, InstCombiner::BuilderTy &Builder)
	Try to fold (icmp(A & B) ==/!= 0) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y), where the left-hand side and the right hand side aren't of the common mask pattern type.
static Value *	foldLogOpOfMaskedICmps (ICmpInst *LHS, ICmpInst *RHS, bool IsAnd, bool IsLogical, InstCombiner::BuilderTy &Builder)
	Try to fold (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y).
static Value *	foldAndOrOfICmpsWithPow2AndWithZero (InstCombiner::BuilderTy &Builder, ICmpInst *LHS, ICmpInst *RHS, bool IsAnd, const SimplifyQuery &Q)
static Value *	foldSignedTruncationCheck (ICmpInst *ICmp0, ICmpInst *ICmp1, Instruction &CxtI, InstCombiner::BuilderTy &Builder)
	General pattern: X & Y.
static Value *	foldIsPowerOf2OrZero (ICmpInst *Cmp0, ICmpInst *Cmp1, bool IsAnd, InstCombiner::BuilderTy &Builder)
	Fold (icmp eq ctpop(X) 1) | (icmp eq X 0) into (icmp ult ctpop(X) 2) and fold (icmp ne ctpop(X) 1) & (icmp ne X 0) into (icmp ugt ctpop(X) 1).
static Value *	foldIsPowerOf2 (ICmpInst *Cmp0, ICmpInst *Cmp1, bool JoinedByAnd, InstCombiner::BuilderTy &Builder)
	Reduce a pair of compares that check if a value has exactly 1 bit set.
static Value *	foldNegativePower2AndShiftedMask (Value *A, Value *B, Value *D, Value *E, ICmpInst::Predicate PredL, ICmpInst::Predicate PredR, InstCombiner::BuilderTy &Builder)
	Try to fold (icmp(A & B) == 0) & (icmp(A & D) != E) into (icmp A u< D) iff B is a contiguous set of ones starting from the most significant bit (negative power of 2), D and E are equal, and D is a contiguous set of ones starting at the most significant zero bit in B.
static Value *	foldPowerOf2AndShiftedMask (ICmpInst *Cmp0, ICmpInst *Cmp1, bool JoinedByAnd, InstCombiner::BuilderTy &Builder)
	Try to fold ((icmp X u< P) & (icmp(X & M) != M)) or ((icmp X s> -1) & (icmp(X & M) != M)) into (icmp X u< M).
static Value *	foldUnsignedUnderflowCheck (ICmpInst *ZeroICmp, ICmpInst *UnsignedICmp, bool IsAnd, const SimplifyQuery &Q, InstCombiner::BuilderTy &Builder)
	Commuted variants are assumed to be handled by calling this function again with the parameters swapped.
static std::optional< IntPart >	matchIntPart (Value *V)
	Match an extraction of bits from an integer.
static Value *	extractIntPart (const IntPart &P, IRBuilderBase &Builder)
	Materialize an extraction of bits from an integer in IR.
static Value *	foldAndOrOfICmpsWithConstEq (ICmpInst *Cmp0, ICmpInst *Cmp1, bool IsAnd, bool IsLogical, InstCombiner::BuilderTy &Builder, const SimplifyQuery &Q)
	Reduce logic-of-compares with equality to a constant by substituting a common operand with the constant.
static Value *	stripSignOnlyFPOps (Value *Val)
	Ignore all operations which only change the sign of a value, returning the underlying magnitude value.
static bool	matchIsNotNaN (FCmpInst::Predicate P, Value *LHS, Value *RHS)
	Matches canonical form of isnan, fcmp ord x, 0.
static bool	matchUnorderedInfCompare (FCmpInst::Predicate P, Value *LHS, Value *RHS)
	Matches fcmp u__ x, +/-inf.
static Value *	matchIsFiniteTest (InstCombiner::BuilderTy &Builder, FCmpInst *LHS, FCmpInst *RHS)
	and (fcmp ord x, 0), (fcmp u* x, inf) -> fcmp o* x, inf
static bool	matchIsFPClassLikeFCmp (Value *Op, Value *&ClassVal, uint64_t &ClassMask)
	Match an fcmp against a special value that performs a test possible by llvm.is.fpclass.
static Instruction *	reassociateFCmps (BinaryOperator &BO, InstCombiner::BuilderTy &Builder)
	This a limited reassociation for a special case (see above) where we are checking if two values are either both NAN (unordered) or not-NAN (ordered).
static Instruction *	matchDeMorgansLaws (BinaryOperator &I, InstCombiner &IC)
	Match variations of De Morgan's Laws: (~A & ~B) == (~(A | B)) (~A | ~B) == (~(A & B))
static Instruction *	foldLogicCastConstant (BinaryOperator &Logic, CastInst *Cast, InstCombinerImpl &IC)
	Fold {and,or,xor} (cast X), C.
static Instruction *	foldAndToXor (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static Instruction *	foldOrToXor (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static bool	canNarrowShiftAmt (Constant *C, unsigned BitWidth)
	Return true if a constant shift amount is always less than the specified bit-width.
static Instruction *	foldComplexAndOrPatterns (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
	Try folding relatively complex patterns for both And and Or operations with all And and Or swapped.
static Instruction *	reassociateForUses (BinaryOperator &BO, InstCombinerImpl::BuilderTy &Builder)
	Try to reassociate a pair of binops so that values with one use only are part of the same instruction.
static Instruction *	canonicalizeLogicFirst (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static Instruction *	foldBitwiseLogicWithIntrinsics (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static Value *	simplifyAndOrWithOpReplaced (Value *V, Value *Op, Value *RepOp, bool SimplifyOnly, InstCombinerImpl &IC, unsigned Depth=0)
static Instruction *	matchFunnelShift (Instruction &Or, InstCombinerImpl &IC)
	Match UB-safe variants of the funnel shift intrinsic.
static Instruction *	matchOrConcat (Instruction &Or, InstCombiner::BuilderTy &Builder)
	Attempt to combine or(zext(x),shl(zext(y),bw/2) concat packing patterns.
static bool	areInverseVectorBitmasks (Constant *C1, Constant *C2)
	If all elements of two constant vectors are 0/-1 and inverses, return true.
static Value *	foldAndOrOfICmpEqConstantAndICmp (ICmpInst *LHS, ICmpInst *RHS, bool IsAnd, bool IsLogical, IRBuilderBase &Builder)
static Value *	foldOrOfInversions (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static Instruction *	foldXorToXor (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
	A ^ B can be specified using other logic ops in a variety of patterns.
static Instruction *	visitMaskedMerge (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
	If we have a masked merge, in the canonical form of: (assuming that A only has one use.) | A | |B| ((x ^ y) & M) ^ y | D |.
static Instruction *	foldNotXor (BinaryOperator &I, InstCombiner::BuilderTy &Builder)
static Instruction *	canonicalizeAbs (BinaryOperator &Xor, InstCombiner::BuilderTy &Builder)
	Canonicalize a shifty way to code absolute value to the more common pattern that uses negation and select.
static bool	canFreelyInvert (InstCombiner &IC, Value *Op, Instruction *IgnoredUser)
static Value *	freelyInvert (InstCombinerImpl &IC, Value *Op, Instruction *IgnoredUser)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "instcombine"

Definition at line 25 of file InstCombineAndOrXor.cpp.

Enumeration Type Documentation

MaskedICmpType

enum MaskedICmpType

Classify (icmp eq (A & B), C) and (icmp ne (A & B), C) as matching patterns that can be simplified.

One of A and B is considered the mask. The other is the value. This is described as the "AMask" or "BMask" part of the enum. If the enum contains only "Mask", then both A and B can be considered masks. If A is the mask, then it was proven that (A & C) == C. This is trivial if C == A or C == 0. If both A and C are constants, this proof is also easy. For the following explanations, we assume that A is the mask.

"AllOnes" declares that the comparison is true only if (A & B) == A or all bits of A are set in B. Example: (icmp eq (A & 3), 3) -> AMask_AllOnes

"AllZeros" declares that the comparison is true only if (A & B) == 0 or all bits of A are cleared in B. Example: (icmp eq (A & 3), 0) -> Mask_AllZeroes

"Mixed" declares that (A & B) == C and C might or might not contain any number of one bits and zero bits. Example: (icmp eq (A & 3), 1) -> AMask_Mixed

"Not" means that in above descriptions "==" should be replaced by "!=". Example: (icmp ne (A & 3), 3) -> AMask_NotAllOnes

If the mask A contains a single bit, then the following is equivalent: (icmp eq (A & B), A) equals (icmp ne (A & B), 0) (icmp ne (A & B), A) equals (icmp eq (A & B), 0)

Enumerator
AMask_AllOnes
AMask_NotAllOnes
BMask_AllOnes
BMask_NotAllOnes
Mask_AllZeros
Mask_NotAllZeros
AMask_Mixed
AMask_NotMixed
BMask_Mixed
BMask_NotMixed

Definition at line 103 of file InstCombineAndOrXor.cpp.

Function Documentation

areInverseVectorBitmasks()

static bool areInverseVectorBitmasks ( Constant *  C1, Constant *  C2  )

static

If all elements of two constant vectors are 0/-1 and inverses, return true.

Definition at line 3101 of file InstCombineAndOrXor.cpp.

References llvm::Constant::getAggregateElement(), llvm::Value::getType(), llvm::PatternMatch::m_AllOnes(), llvm::PatternMatch::m_Zero(), and llvm::PatternMatch::match().

canFreelyInvert()

static bool canFreelyInvert ( InstCombiner &  IC, Value *  Op, Instruction *  IgnoredUser  )

static

Definition at line 4346 of file InstCombineAndOrXor.cpp.

References llvm::InstCombiner::canFreelyInvertAllUsersOf(), I, and llvm::InstCombiner::isFreeToInvert().

Referenced by llvm::InstCombinerImpl::sinkNotIntoLogicalOp(), and llvm::InstCombinerImpl::sinkNotIntoOtherHandOfLogicalOp().

canNarrowShiftAmt()

static bool canNarrowShiftAmt ( Constant *  C, unsigned  BitWidth  )

static

Return true if a constant shift amount is always less than the specified bit-width.

If not, the shift could create poison in the narrower type.

Definition at line 1912 of file InstCombineAndOrXor.cpp.

References llvm::BitWidth, llvm::CallingConv::C, llvm::CmpInst::ICMP_ULT, llvm::PatternMatch::m_SpecificInt_ICMP(), and llvm::PatternMatch::match().

canonicalizeAbs()

static Instruction * canonicalizeAbs ( BinaryOperator &  Xor, InstCombiner::BuilderTy &  Builder  )

static

Canonicalize a shifty way to code absolute value to the more common pattern that uses negation and select.

Definition at line 4314 of file InstCombineAndOrXor.cpp.

References A, llvm::Add, assert(), llvm::SelectInst::Create(), llvm::IRBuilderBase::CreateIsNeg(), llvm::IRBuilderBase::CreateNeg(), llvm::Constant::getNullValue(), llvm::Type::getScalarSizeInBits(), llvm::Value::hasNUses(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_AShr(), llvm::PatternMatch::m_c_Add(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), std::swap(), and llvm::Xor.

Referenced by llvm::InstCombinerImpl::visitXor().

canonicalizeLogicFirst()

static Instruction * canonicalizeLogicFirst ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 2136 of file InstCombineAndOrXor.cpp.

References llvm::CallingConv::C, llvm::APInt::countr_zero(), llvm::IRBuilderBase::CreateBinOp(), llvm::BinaryOperator::CreateWithCopiedFlags(), llvm::Type::getScalarSizeInBits(), I, llvm_unreachable, llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and X.

Referenced by llvm::InstCombinerImpl::visitAnd(), llvm::InstCombinerImpl::visitOr(), and llvm::InstCombinerImpl::visitXor().

conjugateICmpMask()

static unsigned conjugateICmpMask ( unsigned  Mask )

static

Convert an analysis of a masked ICmp into its equivalent if all boolean operations had the opposite sense.

Since each "NotXXX" flag (recording !=) is adjacent to the corresponding normal flag (recording ==), this just involves swapping those bits over.

Definition at line 168 of file InstCombineAndOrXor.cpp.

References AMask_AllOnes, AMask_Mixed, AMask_NotAllOnes, AMask_NotMixed, BMask_AllOnes, BMask_Mixed, BMask_NotAllOnes, BMask_NotMixed, Mask_AllZeros, and Mask_NotAllZeros.

Referenced by foldLogOpOfMaskedICmps(), and foldLogOpOfMaskedICmpsAsymmetric().

decomposeBitTestICmp()

static bool decomposeBitTestICmp ( Value *  LHS, Value *  RHS, CmpInst::Predicate &  Pred, Value *&  X, Value *&  Y, Value *&  Z  )

static

Definition at line 182 of file InstCombineAndOrXor.cpp.

References llvm::decomposeBitTestICmp(), LHS, RHS, X, and Y.

extractIntPart()

static Value * extractIntPart ( const IntPart &  P, IRBuilderBase &  Builder  )

static

Materialize an extraction of bits from an integer in IR.

Definition at line 1146 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateLShr(), llvm::IRBuilderBase::CreateTrunc(), and P.

foldAndOrOfICmpEqConstantAndICmp()

static Value * foldAndOrOfICmpEqConstantAndICmp ( ICmpInst *  LHS, ICmpInst *  RHS, bool  IsAnd, bool  IsLogical, IRBuilderBase &  Builder  )

static

Definition at line 3240 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateFreeze(), llvm::IRBuilderBase::CreateICmp(), llvm::IRBuilderBase::CreateSub(), llvm::Value::getType(), llvm::Value::hasOneUse(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULT, llvm::Type::isIntOrIntVectorTy(), llvm::APInt::isZero(), LHS, llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_APIntAllowPoison(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificIntAllowPoison(), llvm::PatternMatch::match(), llvm::Other, and RHS.

foldAndOrOfICmpsWithConstEq()

static Value * foldAndOrOfICmpsWithConstEq ( ICmpInst *  Cmp0, ICmpInst *  Cmp1, bool  IsAnd, bool  IsLogical, InstCombiner::BuilderTy &  Builder, const SimplifyQuery &  Q  )

static

Reduce logic-of-compares with equality to a constant by substituting a common operand with the constant.

Callers are expected to call this with Cmp0/Cmp1 switched to handle logic op commutativity.

Definition at line 1232 of file InstCombineAndOrXor.cpp.

References llvm::CallingConv::C, llvm::IRBuilderBase::CreateBinOp(), llvm::IRBuilderBase::CreateICmp(), llvm::IRBuilderBase::CreateLogicalAnd(), llvm::IRBuilderBase::CreateLogicalOr(), llvm::Value::hasOneUse(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::isGuaranteedNotToBeUndefOrPoison(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_Constant(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::simplifyICmpInst(), X, and Y.

foldAndOrOfICmpsWithPow2AndWithZero()

static Value * foldAndOrOfICmpsWithPow2AndWithZero ( InstCombiner::BuilderTy &  Builder, ICmpInst *  LHS, ICmpInst *  RHS, bool  IsAnd, const SimplifyQuery &  Q  )

static

Definition at line 727 of file InstCombineAndOrXor.cpp.

References llvm::SimplifyQuery::AC, llvm::And, llvm::IRBuilderBase::CreateAnd(), llvm::IRBuilderBase::CreateICmp(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DL, llvm::SimplifyQuery::DT, llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::isKnownToBeAPowerOfTwo(), LHS, llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_One(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Zero(), llvm::PatternMatch::match(), RHS, and std::swap().

foldAndToXor()

static Instruction * foldAndToXor ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 1850 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateXor(), llvm::Value::hasOneUse(), I, llvm::PatternMatch::m_BinOp(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Or(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitAnd().

foldBitwiseLogicWithIntrinsics()

static Instruction * foldBitwiseLogicWithIntrinsics ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 2224 of file InstCombineAndOrXor.cpp.

References assert(), llvm::APInt::byteSwap(), llvm::CallInst::Create(), llvm::IRBuilderBase::CreateBinOp(), F, llvm::Intrinsic::getDeclaration(), I, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), llvm::APInt::reverseBits(), X, and Y.

Referenced by llvm::InstCombinerImpl::visitAnd(), llvm::InstCombinerImpl::visitOr(), and llvm::InstCombinerImpl::visitXor().

foldComplexAndOrPatterns()

static Instruction * foldComplexAndOrPatterns ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Try folding relatively complex patterns for both And and Or operations with all And and Or swapped.

Definition at line 1960 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::CallingConv::C, llvm::BinaryOperator::Create(), llvm::IRBuilderBase::CreateAnd(), llvm::IRBuilderBase::CreateBinOp(), llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateNot(), llvm::IRBuilderBase::CreateOr(), llvm::IRBuilderBase::CreateXor(), llvm::Value::hasOneUse(), I, llvm::PatternMatch::m_BinOp(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_c_Xor(), llvm::PatternMatch::m_CombineAnd(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::Or, X, llvm::Xor, and Y.

Referenced by llvm::InstCombinerImpl::visitAnd(), and llvm::InstCombinerImpl::visitOr().

foldIsPowerOf2()

static Value * foldIsPowerOf2 ( ICmpInst *  Cmp0, ICmpInst *  Cmp1, bool  JoinedByAnd, InstCombiner::BuilderTy &  Builder  )

static

Reduce a pair of compares that check if a value has exactly 1 bit set.

Also used for logical and/or, must be poison safe.

Definition at line 948 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateICmpEQ(), llvm::IRBuilderBase::CreateICmpNE(), llvm::User::getOperand(), llvm::CmpInst::getPredicate(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULT, llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificICmp(), llvm::PatternMatch::m_SpecificInt(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZeroInt(), llvm::PatternMatch::match(), std::swap(), and X.

foldIsPowerOf2OrZero()

static Value * foldIsPowerOf2OrZero ( ICmpInst *  Cmp0, ICmpInst *  Cmp1, bool  IsAnd, InstCombiner::BuilderTy &  Builder  )

static

Fold (icmp eq ctpop(X) 1) | (icmp eq X 0) into (icmp ult ctpop(X) 2) and fold (icmp ne ctpop(X) 1) & (icmp ne X 0) into (icmp ugt ctpop(X) 1).

Also used for logical and/or, must be poison safe.

Definition at line 928 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateICmpUGT(), llvm::IRBuilderBase::CreateICmpULT(), llvm::User::getOperand(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificInt(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZeroInt(), llvm::PatternMatch::match(), and X.

foldLogicCastConstant()

static Instruction * foldLogicCastConstant ( BinaryOperator &  Logic, CastInst *  Cast, InstCombinerImpl &  IC  )

static

Fold {and,or,xor} (cast X), C.

Definition at line 1718 of file InstCombineAndOrXor.cpp.

References llvm::InstCombiner::Builder, llvm::CallingConv::C, llvm::IRBuilderBase::CreateBinOp(), llvm::InstCombinerImpl::getLosslessSignedTrunc(), llvm::InstCombinerImpl::getLosslessUnsignedTrunc(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::CastInst::getSrcTy(), llvm::Value::getType(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_SExtLike(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), and X.

foldLogOpOfMaskedICmps()

static Value * foldLogOpOfMaskedICmps ( ICmpInst *  LHS, ICmpInst *  RHS, bool  IsAnd, bool  IsLogical, InstCombiner::BuilderTy &  Builder  )

static

Try to fold (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y).

Definition at line 501 of file InstCombineAndOrXor.cpp.

References A, AMask_AllOnes, AMask_NotAllOnes, assert(), B, BMask_AllOnes, BMask_Mixed, BMask_NotAllOnes, BMask_NotMixed, llvm::CallingConv::C, CC, conjugateICmpMask(), llvm::IRBuilderBase::CreateAnd(), llvm::IRBuilderBase::CreateICmp(), llvm::IRBuilderBase::CreateOr(), D, foldLogOpOfMaskedICmpsAsymmetric(), llvm::CmpInst::getInversePredicate(), getMaskedTypeForICmpPair(), llvm::Constant::getNullValue(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::ICmpInst::isEquality(), llvm::isGuaranteedNotToBeUndefOrPoison(), llvm::APInt::isSubsetOf(), LHS, llvm::PatternMatch::m_APInt(), Mask_AllZeros, Mask_NotAllZeros, llvm::PatternMatch::match(), and RHS.

foldLogOpOfMaskedICmps_NotAllZeros_BMask_Mixed()

static Value * foldLogOpOfMaskedICmps_NotAllZeros_BMask_Mixed ( ICmpInst *  LHS, ICmpInst *  RHS, bool  IsAnd, Value *  A, Value *  B, Value *  D, Value *  E, ICmpInst::Predicate  PredL, ICmpInst::Predicate  PredR, InstCombiner::BuilderTy &  Builder  )

static

Try to fold (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y), where the left-hand side is of type Mask_NotAllZeros and the right hand side is of type BMask_Mixed.

For example, (icmp (A & 12) != 0) & (icmp (A & 15) == 8) -> (icmp (A & 15) == 8). Also used for logical and/or, must be poison safe.

Definition at line 328 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::APFloat::bitcastToAPInt(), llvm::APInt::clearSignBit(), llvm::IRBuilderBase::CreateAnd(), llvm::IRBuilderBase::CreateFCmp(), llvm::IRBuilderBase::CreateICmp(), D, llvm::CmpInst::FCMP_ORD, llvm::CmpInst::FCMP_UNO, llvm::Type::getFltSemantics(), llvm::APFloat::getInf(), llvm::IRBuilderBase::GetInsertBlock(), llvm::BasicBlock::getParent(), llvm::Value::getType(), llvm::ConstantFP::getZero(), llvm::Function::hasFnAttribute(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::APInt::intersects(), llvm::Type::isIEEELikeFPTy(), llvm::APInt::isZero(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ElementWiseBitCast(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and RHS.

Referenced by foldLogOpOfMaskedICmpsAsymmetric().

foldLogOpOfMaskedICmpsAsymmetric()

static Value * foldLogOpOfMaskedICmpsAsymmetric ( ICmpInst *  LHS, ICmpInst *  RHS, bool  IsAnd, Value *  A, Value *  B, Value *  C, Value *  D, Value *  E, ICmpInst::Predicate  PredL, ICmpInst::Predicate  PredR, unsigned  LHSMask, unsigned  RHSMask, InstCombiner::BuilderTy &  Builder  )

static

Try to fold (icmp(A & B) ==/!= 0) &/| (icmp(A & D) ==/!= E) into a single (icmp(A & X) ==/!= Y), where the left-hand side and the right hand side aren't of the common mask pattern type.

Also used for logical and/or, must be poison safe.

Definition at line 470 of file InstCombineAndOrXor.cpp.

References A, assert(), B, BMask_Mixed, llvm::CallingConv::C, conjugateICmpMask(), D, foldLogOpOfMaskedICmps_NotAllZeros_BMask_Mixed(), llvm::ICmpInst::isEquality(), LHS, Mask_NotAllZeros, and RHS.

Referenced by foldLogOpOfMaskedICmps().

foldNegativePower2AndShiftedMask()

static Value * foldNegativePower2AndShiftedMask ( Value *  A, Value *  B, Value *  D, Value *  E, ICmpInst::Predicate  PredL, ICmpInst::Predicate  PredR, InstCombiner::BuilderTy &  Builder  )

static

Try to fold (icmp(A & B) == 0) & (icmp(A & D) != E) into (icmp A u< D) iff B is a contiguous set of ones starting from the most significant bit (negative power of 2), D and E are equal, and D is a contiguous set of ones starting at the most significant zero bit in B.

Parameter B supports masking using undef/poison in either scalar or vector values.

Definition at line 983 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::APInt::countLeadingOnes(), llvm::APInt::countLeadingZeros(), llvm::IRBuilderBase::CreateICmp(), D, I, llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_ULT, llvm::ICmpInst::isEquality(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_APIntAllowPoison(), llvm::PatternMatch::m_NegatedPower2(), llvm::PatternMatch::m_ShiftedMask(), and llvm::PatternMatch::match().

Referenced by foldPowerOf2AndShiftedMask().

foldNotXor()

static Instruction * foldNotXor ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 4280 of file InstCombineAndOrXor.cpp.

References A, B, llvm::CallingConv::C, llvm::IRBuilderBase::CreateNot(), D, I, llvm::PatternMatch::m_And(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Or(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Xor(), llvm::PatternMatch::match(), X, and Y.

foldOrOfInversions()

static Value * foldOrOfInversions ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 3486 of file InstCombineAndOrXor.cpp.

References assert(), llvm::IRBuilderBase::CreateXor(), I, llvm::isKnownInversion(), llvm::PatternMatch::m_And(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitOr().

foldOrToXor()

static Instruction * foldOrToXor ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

Definition at line 1876 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::IRBuilderBase::CreateAnd(), llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateXor(), llvm::Value::hasOneUse(), I, llvm::PatternMatch::m_And(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Xor(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitOr().

foldPowerOf2AndShiftedMask()

static Value * foldPowerOf2AndShiftedMask ( ICmpInst *  Cmp0, ICmpInst *  Cmp1, bool  JoinedByAnd, InstCombiner::BuilderTy &  Builder  )

static

Try to fold ((icmp X u< P) & (icmp(X & M) != M)) or ((icmp X s> -1) & (icmp(X & M) != M)) into (icmp X u< M).

Where P is a power of 2, M < P, and M is a contiguous shifted mask starting at the right most significant zero bit in P. SGT is supported as when P is the largest representable power of 2, an earlier optimization converts the expression into (icmp X s> -1). Parameter P supports masking using undef/poison in either scalar or vector values.

Definition at line 1049 of file InstCombineAndOrXor.cpp.

References A, B, BMask_NotAllOnes, BMask_NotMixed, llvm::CallingConv::C, D, foldNegativePower2AndShiftedMask(), getMaskedTypeForICmpPair(), llvm::CmpInst::getPredicate(), and Mask_AllZeros.

foldSignedTruncationCheck()

static Value * foldSignedTruncationCheck ( ICmpInst *  ICmp0, ICmpInst *  ICmp1, Instruction &  CxtI, InstCombiner::BuilderTy &  Builder  )

static

General pattern: X & Y.

Where Y is checking that all the high bits (covered by a mask 4294967168) are uniform, i.e. arg & 4294967168 can be either 4294967168 or 0 Pattern can be one of: t = add i32 arg, 128 r = icmp ult i32 t, 256 Or t0 = shl i32 arg, 24 t1 = ashr i32 t0, 24 r = icmp eq i32 t1, arg Or t0 = trunc i32 arg to i8 t1 = sext i8 t0 to i32 r = icmp eq i32 t1, arg This pattern is a signed truncation check.

And X is checking that some bit in that same mask is zero. I.e. can be one of: r = icmp sgt i32 arg, -1 Or t = and i32 arg, 2147483648 r = icmp eq i32 t, 0

Since we are checking that all the bits in that mask are the same, and a particular bit is zero, what we are really checking is that all the masked bits are zero. So this should be transformed to: r = icmp ult i32 arg, 128

Definition at line 831 of file InstCombineAndOrXor.cpp.

References assert(), llvm::IRBuilderBase::CreateICmpULT(), llvm::decomposeBitTestICmp(), llvm::Value::getName(), llvm::Instruction::getOpcode(), llvm::User::getOperand(), llvm::CmpInst::getPredicate(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_ULT, llvm::APInt::intersects(), llvm::APInt::isPowerOf2(), llvm::APInt::isSubsetOf(), llvm::APInt::isZero(), llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_And(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Power2(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificICmp(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Zero(), llvm::PatternMatch::match(), llvm::APInt::shl(), llvm::APIntOps::umin(), X, and llvm::APInt::zext().

foldUnsignedUnderflowCheck()

static Value * foldUnsignedUnderflowCheck ( ICmpInst *  ZeroICmp, ICmpInst *  UnsignedICmp, bool  IsAnd, const SimplifyQuery &  Q, InstCombiner::BuilderTy &  Builder  )

static

Commuted variants are assumed to be handled by calling this function again with the parameters swapped.

Definition at line 1082 of file InstCombineAndOrXor.cpp.

References A, B, llvm::IRBuilderBase::CreateICmpUGE(), llvm::IRBuilderBase::CreateICmpULT(), llvm::IRBuilderBase::CreateNeg(), llvm::Value::hasOneUse(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_ULT, llvm::ICmpInst::isEquality(), llvm::isKnownNonZero(), llvm::PatternMatch::m_c_Add(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Zero(), llvm::PatternMatch::match(), llvm::Other, and std::swap().

foldXorToXor()

static Instruction * foldXorToXor ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

A ^ B can be specified using other logic ops in a variety of patterns.

We can fold these early and efficiently by morphing an existing instruction.

Definition at line 4059 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateXor(), llvm::Value::hasOneUse(), I, llvm::PatternMatch::m_And(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_c_Xor(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Or(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Xor(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitXor().

freelyInvert()

static Value * freelyInvert ( InstCombinerImpl &  IC, Value *  Op, Instruction *  IgnoredUser  )

static

Definition at line 4353 of file InstCombineAndOrXor.cpp.

References llvm::InstCombiner::Builder, llvm::IRBuilderBase::CreateNot(), llvm::InstCombinerImpl::freelyInvertAllUsersOf(), I, and llvm::IRBuilderBase::SetInsertPoint().

Referenced by llvm::InstCombinerImpl::sinkNotIntoLogicalOp(), and llvm::InstCombinerImpl::sinkNotIntoOtherHandOfLogicalOp().

getFCmpValue()

static Value * getFCmpValue ( unsigned  Code, Value *  LHS, Value *  RHS, InstCombiner::BuilderTy &  Builder  )

static

This is the complement of getFCmpCode, which turns an opcode and two operands into either a FCmp instruction, or a true/false constant.

Definition at line 41 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateFCmp(), llvm::getPredForFCmpCode(), llvm::Value::getType(), LHS, and RHS.

getMaskedICmpType()

static unsigned getMaskedICmpType ( Value *  A, Value *  B, Value *  C, ICmpInst::Predicate  Pred  )

static

Return the set of patterns (from MaskedICmpType) that (icmp SCC (A & B), C) satisfies.

Definition at line 118 of file InstCombineAndOrXor.cpp.

References A, AMask_AllOnes, AMask_Mixed, AMask_NotAllOnes, AMask_NotMixed, B, BMask_AllOnes, BMask_Mixed, BMask_NotAllOnes, BMask_NotMixed, llvm::CallingConv::C, llvm::CmpInst::ICMP_EQ, llvm::APInt::isPowerOf2(), llvm::APInt::isSubsetOf(), llvm::PatternMatch::m_APInt(), Mask_AllZeros, Mask_NotAllZeros, and llvm::PatternMatch::match().

Referenced by getMaskedTypeForICmpPair().

getMaskedTypeForICmpPair()

static std::optional< std::pair< unsigned, unsigned > > getMaskedTypeForICmpPair ( Value *&  A, Value *&  B, Value *&  C, Value *&  D, Value *&  E, ICmpInst *  LHS, ICmpInst *  RHS, ICmpInst::Predicate &  PredL, ICmpInst::Predicate &  PredR  )

static

Handle (icmp(A & B) ==/!= C) &/| (icmp(A & D) ==/!= E).

Return the pattern classes (from MaskedICmpType) for the left hand side and the right hand side as a pair. LHS and RHS are the left hand side and the right hand side ICmps and PredL and PredR are their predicates, respectively.

Definition at line 198 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::CallingConv::C, D, llvm::decomposeBitTestICmp(), llvm::Constant::getAllOnesValue(), getMaskedICmpType(), llvm::Value::getType(), llvm::ICmpInst::isEquality(), llvm::Type::isIntOrIntVectorTy(), LHS, llvm::PatternMatch::m_And(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), R2, and RHS.

Referenced by foldLogOpOfMaskedICmps(), and foldPowerOf2AndShiftedMask().

getNewICmpValue()

static Value * getNewICmpValue ( unsigned  Code, bool  Sign, Value *  LHS, Value *  RHS, InstCombiner::BuilderTy &  Builder  )

static

This is the complement of getICmpCode, which turns an opcode and two operands into either a constant true or false, or a brand new ICmp instruction.

The sign is passed in to determine which kind of predicate to use in the new icmp instruction.

Definition at line 31 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateICmp(), llvm::getPredForICmpCode(), llvm::Value::getType(), LHS, and RHS.

matchDeMorgansLaws()

static Instruction * matchDeMorgansLaws ( BinaryOperator &  I, InstCombiner &  IC  )

static

Match variations of De Morgan's Laws: (~A & ~B) == (~(A | B)) (~A | ~B) == (~(A & B))

Definition at line 1665 of file InstCombineAndOrXor.cpp.

References A, assert(), B, llvm::InstCombiner::Builder, llvm::CallingConv::C, llvm::BinaryOperator::Create(), llvm::IRBuilderBase::CreateBinOp(), llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateNot(), I, llvm::InstCombiner::isFreeToInvert(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitAnd(), and llvm::InstCombinerImpl::visitOr().

matchFunnelShift()

static Instruction * matchFunnelShift ( Instruction &  Or, InstCombinerImpl &  IC  )

static

Match UB-safe variants of the funnel shift intrinsic.

Definition at line 3037 of file InstCombineAndOrXor.cpp.

References llvm::InstCombinerImpl::convertOrOfShiftsToFunnelShift(), llvm::CallInst::Create(), F, llvm::Intrinsic::getDeclaration(), and llvm::Or.

Referenced by foldGuardedFunnelShift(), and llvm::InstCombinerImpl::visitOr().

matchIntPart()

static std::optional< IntPart > matchIntPart ( Value *  V )

static

Match an extraction of bits from an integer.

Definition at line 1128 of file InstCombineAndOrXor.cpp.

References llvm::APInt::getZExtValue(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_LShr(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::APInt::ule(), X, and Y.

matchIsFiniteTest()

static Value * matchIsFiniteTest ( InstCombiner::BuilderTy &  Builder, FCmpInst *  LHS, FCmpInst *  RHS  )

static

and (fcmp ord x, 0), (fcmp u* x, inf) -> fcmp o* x, inf

Clang emits this pattern for doing an isfinite check in __builtin_isnormal.

Definition at line 1370 of file InstCombineAndOrXor.cpp.

References llvm::IRBuilderBase::CreateFCmp(), llvm::CmpInst::getOrderedPredicate(), LHS, matchIsNotNaN(), matchUnorderedInfCompare(), RHS, and llvm::IRBuilderBase::setFastMathFlags().

matchIsFPClassLikeFCmp()

static bool matchIsFPClassLikeFCmp ( Value *  Op, Value *&  ClassVal, uint64_t &  ClassMask  )

static

Match an fcmp against a special value that performs a test possible by llvm.is.fpclass.

Definition at line 1519 of file InstCombineAndOrXor.cpp.

References llvm::fcmpToClassTest().

matchIsNotNaN()

static bool matchIsNotNaN ( FCmpInst::Predicate  P, Value *  LHS, Value *  RHS  )

static

Matches canonical form of isnan, fcmp ord x, 0.

Definition at line 1357 of file InstCombineAndOrXor.cpp.

References llvm::CmpInst::FCMP_ORD, llvm::PatternMatch::m_AnyZeroFP(), llvm::PatternMatch::match(), P, and RHS.

Referenced by matchIsFiniteTest().

matchOrConcat()

static Instruction * matchOrConcat ( Instruction &  Or, InstCombiner::BuilderTy &  Builder  )

static

Attempt to combine or(zext(x),shl(zext(y),bw/2) concat packing patterns.

Definition at line 3048 of file InstCombineAndOrXor.cpp.

References assert(), llvm::CallingConv::C, llvm::IRBuilderBase::CreateCall(), llvm::IRBuilderBase::CreateOr(), llvm::IRBuilderBase::CreateShl(), llvm::IRBuilderBase::CreateZExt(), F, llvm::Intrinsic::getDeclaration(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), llvm::Hi, llvm::Lo, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_BitReverse(), llvm::PatternMatch::m_BSwap(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), llvm::Or, and std::swap().

Referenced by llvm::InstCombinerImpl::visitOr().

matchUnorderedInfCompare()

static bool matchUnorderedInfCompare ( FCmpInst::Predicate  P, Value *  LHS, Value *  RHS  )

static

Matches fcmp u__ x, +/-inf.

Definition at line 1362 of file InstCombineAndOrXor.cpp.

References llvm::CmpInst::isUnordered(), llvm::PatternMatch::m_Inf(), llvm::PatternMatch::match(), P, and RHS.

Referenced by matchIsFiniteTest().

reassociateFCmps()

static Instruction * reassociateFCmps ( BinaryOperator &  BO, InstCombiner::BuilderTy &  Builder  )

static

This a limited reassociation for a special case (see above) where we are checking if two values are either both NAN (unordered) or not-NAN (ordered).

This could be handled more generally in '-reassociation', but it seems like an unlikely pattern for a large number of logic ops and fcmps.

Definition at line 1621 of file InstCombineAndOrXor.cpp.

References assert(), llvm::BinaryOperator::Create(), llvm::IRBuilderBase::CreateFCmp(), llvm::CmpInst::FCMP_ORD, llvm::CmpInst::FCMP_UNO, llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::PatternMatch::m_AnyZeroFP(), llvm::PatternMatch::m_BinOp(), llvm::PatternMatch::m_FCmp(), llvm::PatternMatch::m_SpecificFCmp(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), std::swap(), X, and Y.

Referenced by llvm::InstCombinerImpl::visitAnd(), and llvm::InstCombinerImpl::visitOr().

reassociateForUses()

static Instruction * reassociateForUses ( BinaryOperator &  BO, InstCombinerImpl::BuilderTy &  Builder  )

static

Try to reassociate a pair of binops so that values with one use only are part of the same instruction.

This may enable folds that are limited with multi-use restrictions and makes it more likely to match other patterns that are looking for a common operand.

Definition at line 2103 of file InstCombineAndOrXor.cpp.

References llvm::BinaryOperator::Create(), llvm::IRBuilderBase::CreateBinOp(), llvm::BinaryOperator::getOpcode(), llvm::PatternMatch::m_BinOp(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), X, and Y.

Referenced by llvm::InstCombinerImpl::visitAnd(), llvm::InstCombinerImpl::visitOr(), and llvm::InstCombinerImpl::visitXor().

simplifyAndOrWithOpReplaced()

static Value * simplifyAndOrWithOpReplaced ( Value *  V, Value *  Op, Value *  RepOp, bool  SimplifyOnly, InstCombinerImpl &  IC, unsigned  Depth = 0  )

static

Definition at line 2277 of file InstCombineAndOrXor.cpp.

References llvm::InstCombiner::Builder, llvm::IRBuilderBase::CreateBinOp(), llvm::Depth, llvm::InstCombiner::getSimplifyQuery(), llvm::SimplifyQuery::getWithInstruction(), I, simplifyAndOrWithOpReplaced(), and llvm::simplifyBinOp().

Referenced by simplifyAndOrWithOpReplaced(), llvm::InstCombinerImpl::visitAnd(), and llvm::InstCombinerImpl::visitOr().

stripSignOnlyFPOps()

static Value * stripSignOnlyFPOps ( Value *  Val )

static

Ignore all operations which only change the sign of a value, returning the underlying magnitude value.

Definition at line 1349 of file InstCombineAndOrXor.cpp.

References llvm::PatternMatch::m_CopySign(), llvm::PatternMatch::m_FAbs(), llvm::PatternMatch::m_FNeg(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

visitMaskedMerge()

static Instruction * visitMaskedMerge ( BinaryOperator &  I, InstCombiner::BuilderTy &  Builder  )

static

If we have a masked merge, in the canonical form of: (assuming that A only has one use.) | A | |B| ((x ^ y) & M) ^ y | D |.

• If M is inverted: | D | ((x ^ y) & ~M) ^ y We can canonicalize by swapping the final xor operand to eliminate the 'not' of the mask. ((x ^ y) & M) ^ x
• If M is a constant, and D has one use, we transform to 'and' / 'or' ops because that shortens the dependency chain and improves analysis: (x & M) | (y & ~M)

Definition at line 4247 of file InstCombineAndOrXor.cpp.

References B, llvm::CallingConv::C, llvm::IRBuilderBase::CreateAnd(), llvm::IRBuilderBase::CreateNot(), D, llvm::Constant::getAllOnesValue(), I, LHS, llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Xor(), llvm::PatternMatch::m_CombineAnd(), llvm::PatternMatch::m_Constant(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::Constant::replaceUndefsWith(), RHS, and X.

Referenced by llvm::InstCombinerImpl::visitXor().