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Add helper function for getting true/false constants in a uniform
way for i1 and vector of i1 types. Use these to make some code more self-documenting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136079 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -48,6 +48,26 @@ static Value *SimplifyOrInst(Value *, Value *, const TargetData *,
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static Value *SimplifyXorInst(Value *, Value *, const TargetData *,
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const DominatorTree *, unsigned);
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/// getFalse - For a boolean type, or a vector of boolean type, return false, or
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/// a vector with every element false, as appropriate for the type.
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static Constant *getFalse(Type *Ty) {
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assert((Ty->isIntegerTy(1) ||
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(Ty->isVectorTy() &&
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cast<VectorType>(Ty)->getElementType()->isIntegerTy(1))) &&
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"Expected i1 type or a vector of i1!");
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return Constant::getNullValue(Ty);
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}
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/// getTrue - For a boolean type, or a vector of boolean type, return true, or
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/// a vector with every element true, as appropriate for the type.
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static Constant *getTrue(Type *Ty) {
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assert((Ty->isIntegerTy(1) ||
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(Ty->isVectorTy() &&
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cast<VectorType>(Ty)->getElementType()->isIntegerTy(1))) &&
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"Expected i1 type or a vector of i1!");
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return Constant::getAllOnesValue(Ty);
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}
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/// ValueDominatesPHI - Does the given value dominate the specified phi node?
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static bool ValueDominatesPHI(Value *V, PHINode *P, const DominatorTree *DT) {
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Instruction *I = dyn_cast<Instruction>(V);
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@ -1478,48 +1498,46 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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default:
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assert(false && "Unknown ICmp predicate!");
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case ICmpInst::ICMP_ULT:
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// getNullValue also works for vectors, unlike getFalse.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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case ICmpInst::ICMP_UGE:
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// getAllOnesValue also works for vectors, unlike getTrue.
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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case ICmpInst::ICMP_EQ:
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case ICmpInst::ICMP_ULE:
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if (isKnownNonZero(LHS, TD))
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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break;
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case ICmpInst::ICMP_NE:
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case ICmpInst::ICMP_UGT:
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if (isKnownNonZero(LHS, TD))
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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break;
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case ICmpInst::ICMP_SLT:
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ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
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if (LHSKnownNegative)
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (LHSKnownNonNegative)
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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break;
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case ICmpInst::ICMP_SLE:
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ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
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if (LHSKnownNegative)
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (LHSKnownNonNegative && isKnownNonZero(LHS, TD))
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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break;
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case ICmpInst::ICMP_SGE:
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ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
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if (LHSKnownNegative)
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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if (LHSKnownNonNegative)
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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break;
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case ICmpInst::ICMP_SGT:
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ComputeSignBit(LHS, LHSKnownNonNegative, LHSKnownNegative, TD);
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if (LHSKnownNegative)
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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if (LHSKnownNonNegative && isKnownNonZero(LHS, TD))
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return ConstantInt::getAllOnesValue(ITy);
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return getTrue(ITy);
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break;
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}
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}
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@ -1811,8 +1829,7 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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case ICmpInst::ICMP_EQ:
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case ICmpInst::ICMP_UGT:
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case ICmpInst::ICMP_UGE:
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// getNullValue also works for vectors, unlike getFalse.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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case ICmpInst::ICMP_SLT:
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case ICmpInst::ICMP_SLE:
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ComputeSignBit(LHS, KnownNonNegative, KnownNegative, TD);
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@ -1822,8 +1839,7 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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case ICmpInst::ICMP_NE:
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case ICmpInst::ICMP_ULT:
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case ICmpInst::ICMP_ULE:
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// getAllOnesValue also works for vectors, unlike getTrue.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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}
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}
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if (RBO && match(RBO, m_URem(m_Value(), m_Specific(LHS)))) {
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@ -1840,8 +1856,7 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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case ICmpInst::ICMP_NE:
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case ICmpInst::ICMP_UGT:
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case ICmpInst::ICMP_UGE:
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// getAllOnesValue also works for vectors, unlike getTrue.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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case ICmpInst::ICMP_SLT:
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case ICmpInst::ICMP_SLE:
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ComputeSignBit(RHS, KnownNonNegative, KnownNegative, TD);
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@ -1851,8 +1866,7 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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case ICmpInst::ICMP_EQ:
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case ICmpInst::ICMP_ULT:
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case ICmpInst::ICMP_ULE:
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// getNullValue also works for vectors, unlike getFalse.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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}
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}
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@ -1955,10 +1969,10 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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}
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case CmpInst::ICMP_SGE:
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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case CmpInst::ICMP_SLT:
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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}
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}
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@ -2025,10 +2039,10 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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}
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case CmpInst::ICMP_UGE:
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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case CmpInst::ICMP_ULT:
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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}
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}
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@ -2040,40 +2054,40 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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// max(x, ?) pred min(x, ?).
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if (Pred == CmpInst::ICMP_SGE)
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (Pred == CmpInst::ICMP_SLT)
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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} else if (match(LHS, m_SMin(m_Value(A), m_Value(B))) &&
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match(RHS, m_SMax(m_Value(C), m_Value(D))) &&
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(A == C || A == D || B == C || B == D)) {
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// min(x, ?) pred max(x, ?).
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if (Pred == CmpInst::ICMP_SLE)
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (Pred == CmpInst::ICMP_SGT)
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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} else if (match(LHS, m_UMax(m_Value(A), m_Value(B))) &&
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match(RHS, m_UMin(m_Value(C), m_Value(D))) &&
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(A == C || A == D || B == C || B == D)) {
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// max(x, ?) pred min(x, ?).
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if (Pred == CmpInst::ICMP_UGE)
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (Pred == CmpInst::ICMP_ULT)
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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} else if (match(LHS, m_UMin(m_Value(A), m_Value(B))) &&
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match(RHS, m_UMax(m_Value(C), m_Value(D))) &&
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(A == C || A == D || B == C || B == D)) {
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// min(x, ?) pred max(x, ?).
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if (Pred == CmpInst::ICMP_ULE)
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// Always true.
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return Constant::getAllOnesValue(ITy);
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return getTrue(ITy);
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if (Pred == CmpInst::ICMP_UGT)
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// Always false.
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return Constant::getNullValue(ITy);
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return getFalse(ITy);
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}
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// If the comparison is with the result of a select instruction, check whether
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