From 99281a061522f64d666ba3858d21764107ebab2a Mon Sep 17 00:00:00 2001 From: Dinesh Dwivedi Date: Thu, 26 Jun 2014 08:57:33 +0000 Subject: [PATCH] This patch removed duplicate code for matching patterns which are now handled in SimplifyUsingDistributiveLaws() (after r211261) Differential Revision: http://reviews.llvm.org/D4253 llvm-svn: 211768 --- llvm/lib/Analysis/InstructionSimplify.cpp | 107 +-------------------- .../Transforms/InstCombine/InstCombineAddSub.cpp | 36 ------- .../distribute.ll} | 14 ++- 3 files changed, 11 insertions(+), 146 deletions(-) rename llvm/test/Transforms/{InstSimplify/2010-12-20-Distribute.ll => InstCombine/distribute.ll} (79%) diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp index 8aa6e5a..31263bb 100644 --- a/llvm/lib/Analysis/InstructionSimplify.cpp +++ b/llvm/lib/Analysis/InstructionSimplify.cpp @@ -39,7 +39,6 @@ using namespace llvm::PatternMatch; enum { RecursionLimit = 3 }; STATISTIC(NumExpand, "Number of expansions"); -STATISTIC(NumFactor , "Number of factorizations"); STATISTIC(NumReassoc, "Number of reassociations"); struct Query { @@ -183,78 +182,6 @@ static Value *ExpandBinOp(unsigned Opcode, Value *LHS, Value *RHS, return nullptr; } -/// FactorizeBinOp - Simplify "LHS Opcode RHS" by factorizing out a common term -/// using the operation OpCodeToExtract. For example, when Opcode is Add and -/// OpCodeToExtract is Mul then this tries to turn "(A*B)+(A*C)" into "A*(B+C)". -/// Returns the simplified value, or null if no simplification was performed. -static Value *FactorizeBinOp(unsigned Opcode, Value *LHS, Value *RHS, - unsigned OpcToExtract, const Query &Q, - unsigned MaxRecurse) { - Instruction::BinaryOps OpcodeToExtract = (Instruction::BinaryOps)OpcToExtract; - // Recursion is always used, so bail out at once if we already hit the limit. - if (!MaxRecurse--) - return nullptr; - - BinaryOperator *Op0 = dyn_cast(LHS); - BinaryOperator *Op1 = dyn_cast(RHS); - - if (!Op0 || Op0->getOpcode() != OpcodeToExtract || - !Op1 || Op1->getOpcode() != OpcodeToExtract) - return nullptr; - - // The expression has the form "(A op' B) op (C op' D)". - Value *A = Op0->getOperand(0), *B = Op0->getOperand(1); - Value *C = Op1->getOperand(0), *D = Op1->getOperand(1); - - // Use left distributivity, i.e. "X op' (Y op Z) = (X op' Y) op (X op' Z)". - // Does the instruction have the form "(A op' B) op (A op' D)" or, in the - // commutative case, "(A op' B) op (C op' A)"? - if (A == C || (Instruction::isCommutative(OpcodeToExtract) && A == D)) { - Value *DD = A == C ? D : C; - // Form "A op' (B op DD)" if it simplifies completely. - // Does "B op DD" simplify? - if (Value *V = SimplifyBinOp(Opcode, B, DD, Q, MaxRecurse)) { - // It does! Return "A op' V" if it simplifies or is already available. - // If V equals B then "A op' V" is just the LHS. If V equals DD then - // "A op' V" is just the RHS. - if (V == B || V == DD) { - ++NumFactor; - return V == B ? LHS : RHS; - } - // Otherwise return "A op' V" if it simplifies. - if (Value *W = SimplifyBinOp(OpcodeToExtract, A, V, Q, MaxRecurse)) { - ++NumFactor; - return W; - } - } - } - - // Use right distributivity, i.e. "(X op Y) op' Z = (X op' Z) op (Y op' Z)". - // Does the instruction have the form "(A op' B) op (C op' B)" or, in the - // commutative case, "(A op' B) op (B op' D)"? - if (B == D || (Instruction::isCommutative(OpcodeToExtract) && B == C)) { - Value *CC = B == D ? C : D; - // Form "(A op CC) op' B" if it simplifies completely.. - // Does "A op CC" simplify? - if (Value *V = SimplifyBinOp(Opcode, A, CC, Q, MaxRecurse)) { - // It does! Return "V op' B" if it simplifies or is already available. - // If V equals A then "V op' B" is just the LHS. If V equals CC then - // "V op' B" is just the RHS. - if (V == A || V == CC) { - ++NumFactor; - return V == A ? LHS : RHS; - } - // Otherwise return "V op' B" if it simplifies. - if (Value *W = SimplifyBinOp(OpcodeToExtract, V, B, Q, MaxRecurse)) { - ++NumFactor; - return W; - } - } - } - - return nullptr; -} - /// SimplifyAssociativeBinOp - Generic simplifications for associative binary /// operations. Returns the simpler value, or null if none was found. static Value *SimplifyAssociativeBinOp(unsigned Opc, Value *LHS, Value *RHS, @@ -634,11 +561,6 @@ static Value *SimplifyAddInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW, MaxRecurse)) return V; - // Mul distributes over Add. Try some generic simplifications based on this. - if (Value *V = FactorizeBinOp(Instruction::Add, Op0, Op1, Instruction::Mul, - Q, MaxRecurse)) - return V; - // Threading Add over selects and phi nodes is pointless, so don't bother. // Threading over the select in "A + select(cond, B, C)" means evaluating // "A+B" and "A+C" and seeing if they are equal; but they are equal if and @@ -754,16 +676,9 @@ static Value *SimplifySubInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW, if (Op0 == Op1) return Constant::getNullValue(Op0->getType()); - // (X*2) - X -> X - // (X<<1) - X -> X - Value *X = nullptr; - if (match(Op0, m_Mul(m_Specific(Op1), m_ConstantInt<2>())) || - match(Op0, m_Shl(m_Specific(Op1), m_One()))) - return Op1; - // (X + Y) - Z -> X + (Y - Z) or Y + (X - Z) if everything simplifies. // For example, (X + Y) - Y -> X; (Y + X) - Y -> X - Value *Y = nullptr, *Z = Op1; + Value *X = nullptr, *Y = nullptr, *Z = Op1; if (MaxRecurse && match(Op0, m_Add(m_Value(X), m_Value(Y)))) { // (X + Y) - Z // See if "V === Y - Z" simplifies. if (Value *V = SimplifyBinOp(Instruction::Sub, Y, Z, Q, MaxRecurse-1)) @@ -835,11 +750,6 @@ static Value *SimplifySubInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW, if (Constant *Result = computePointerDifference(Q.DL, X, Y)) return ConstantExpr::getIntegerCast(Result, Op0->getType(), true); - // Mul distributes over Sub. Try some generic simplifications based on this. - if (Value *V = FactorizeBinOp(Instruction::Sub, Op0, Op1, Instruction::Mul, - Q, MaxRecurse)) - return V; - // i1 sub -> xor. if (MaxRecurse && Op0->getType()->isIntegerTy(1)) if (Value *V = SimplifyXorInst(Op0, Op1, Q, MaxRecurse-1)) @@ -1518,11 +1428,6 @@ static Value *SimplifyAndInst(Value *Op0, Value *Op1, const Query &Q, Q, MaxRecurse)) return V; - // Or distributes over And. Try some generic simplifications based on this. - if (Value *V = FactorizeBinOp(Instruction::And, Op0, Op1, Instruction::Or, - Q, MaxRecurse)) - return V; - // If the operation is with the result of a select instruction, check whether // operating on either branch of the select always yields the same value. if (isa(Op0) || isa(Op1)) @@ -1613,11 +1518,6 @@ static Value *SimplifyOrInst(Value *Op0, Value *Op1, const Query &Q, MaxRecurse)) return V; - // And distributes over Or. Try some generic simplifications based on this. - if (Value *V = FactorizeBinOp(Instruction::Or, Op0, Op1, Instruction::And, - Q, MaxRecurse)) - return V; - // If the operation is with the result of a select instruction, check whether // operating on either branch of the select always yields the same value. if (isa(Op0) || isa(Op1)) @@ -1709,11 +1609,6 @@ static Value *SimplifyXorInst(Value *Op0, Value *Op1, const Query &Q, MaxRecurse)) return V; - // And distributes over Xor. Try some generic simplifications based on this. - if (Value *V = FactorizeBinOp(Instruction::Xor, Op0, Op1, Instruction::And, - Q, MaxRecurse)) - return V; - // Threading Xor over selects and phi nodes is pointless, so don't bother. // Threading over the select in "A ^ select(cond, B, C)" means evaluating // "A^B" and "A^C" and seeing if they are equal; but they are equal if and diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp index 29203d2..6aede84 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp @@ -1131,29 +1131,6 @@ bool InstCombiner::WillNotOverflowUnsignedAdd(Value *LHS, Value *RHS) { } } - // W*X + Y*Z --> W * (X+Z) iff W == Y - { - Value *W, *X, *Y, *Z; - if (match(LHS, m_Mul(m_Value(W), m_Value(X))) && - match(RHS, m_Mul(m_Value(Y), m_Value(Z)))) { - if (W != Y) { - if (W == Z) { - std::swap(Y, Z); - } else if (Y == X) { - std::swap(W, X); - } else if (X == Z) { - std::swap(Y, Z); - std::swap(W, X); - } - } - - if (W == Y) { - Value *NewAdd = Builder->CreateAdd(X, Z, LHS->getName()); - return BinaryOperator::CreateMul(W, NewAdd); - } - } - } - if (Constant *CRHS = dyn_cast(RHS)) { Value *X; if (match(LHS, m_Not(m_Value(X)))) // ~X + C --> (C-1) - X @@ -1572,19 +1549,6 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) { if (Value *XNeg = dyn_castNegVal(X)) return BinaryOperator::CreateShl(XNeg, Y); - // X - X*C --> X * (1-C) - if (match(Op1, m_Mul(m_Specific(Op0), m_Constant(CI)))) { - Constant *CP1 = ConstantExpr::getSub(ConstantInt::get(I.getType(),1), CI); - return BinaryOperator::CreateMul(Op0, CP1); - } - - // X - X< X * (1-(1< X + A*B // X - -A*B -> X + A*B Value *A, *B; diff --git a/llvm/test/Transforms/InstSimplify/2010-12-20-Distribute.ll b/llvm/test/Transforms/InstCombine/distribute.ll similarity index 79% rename from llvm/test/Transforms/InstSimplify/2010-12-20-Distribute.ll rename to llvm/test/Transforms/InstCombine/distribute.ll index 9ea0a5e..e6360f8 100644 --- a/llvm/test/Transforms/InstSimplify/2010-12-20-Distribute.ll +++ b/llvm/test/Transforms/InstCombine/distribute.ll @@ -1,4 +1,4 @@ -; RUN: opt < %s -instsimplify -S | FileCheck %s +; RUN: opt < %s -instcombine -S | FileCheck %s define i32 @factorize(i32 %x, i32 %y) { ; CHECK-LABEL: @factorize( @@ -28,27 +28,32 @@ define i32 @factorize3(i32 %x, i32 %a, i32 %b) { %r = or i32 %x, %b %z = and i32 %l, %r ret i32 %z -; CHECK: ret i32 %r +; CHECK: %z = or i32 %b, %x +; CHECK: ret i32 %z } define i32 @factorize4(i32 %x, i32 %y) { ; CHECK-LABEL: @factorize4( +; ((Y << 1) * X) - (X * Y) -> (X * (Y * 2 - Y)) -> (X * Y) %sh = shl i32 %y, 1 %ml = mul i32 %sh, %x %mr = mul i32 %x, %y %s = sub i32 %ml, %mr ret i32 %s -; CHECK: ret i32 %mr +; CHECK: %s = mul i32 %y, %x +; CHECK: ret i32 %s } define i32 @factorize5(i32 %x, i32 %y) { ; CHECK-LABEL: @factorize5( +; ((Y * 2) * X) - (X * Y) -> (X * Y) %sh = mul i32 %y, 2 %ml = mul i32 %sh, %x %mr = mul i32 %x, %y %s = sub i32 %ml, %mr ret i32 %s -; CHECK: ret i32 %mr +; CHECK: %s = mul i32 %y, %x +; CHECK: ret i32 %s } define i32 @expand(i32 %x) { @@ -58,5 +63,6 @@ define i32 @expand(i32 %x) { %b = or i32 %a, 2 %c = and i32 %b, 1 ret i32 %c +; CHECK: %a = and i32 %x, 1 ; CHECK: ret i32 %a } -- 2.7.4