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Various comment and whitespace cleanups.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79533 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -24,7 +24,7 @@ namespace llvm {
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/// rewrite expressions in canonical form.
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///
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/// Clients should create an instance of this class when rewriting is needed,
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/// and destroy it when finished to allow the release of the associated
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/// and destroy it when finished to allow the release of the associated
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/// memory.
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struct SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
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ScalarEvolution &SE;
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@ -62,7 +62,7 @@ namespace llvm {
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private:
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LLVMContext &getContext() const { return SE.getContext(); }
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/// InsertBinop - Insert the specified binary operator, doing a small amount
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/// of work to avoid inserting an obviously redundant operation.
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Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS, Value *RHS);
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@ -126,4 +126,3 @@ namespace llvm {
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}
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#endif
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@ -208,7 +208,7 @@ static Constant *SymbolicallyEvaluateGEP(Constant* const* Ops, unsigned NumOps,
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"Computed GetElementPtr has unexpected type!");
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// If we ended up indexing a member with a type that doesn't match
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// type type of what the original indices indexed, add a cast.
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// the type of what the original indices indexed, add a cast.
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if (Ty != cast<PointerType>(ResultTy)->getElementType())
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C = ConstantExpr::getBitCast(C, ResultTy);
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@ -1682,7 +1682,7 @@ const SCEV *ScalarEvolution::getUDivExpr(const SCEV *LHS,
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if (const SCEVConstant *RHSC = dyn_cast<SCEVConstant>(RHS)) {
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if (RHSC->getValue()->equalsInt(1))
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return LHS; // X udiv 1 --> x
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return LHS; // X udiv 1 --> x
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if (RHSC->isZero())
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return getIntegerSCEV(0, LHS->getType()); // value is undefined
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@ -3533,8 +3533,8 @@ ScalarEvolution::ComputeBackedgeTakenCountFromExitCondICmp(const Loop *L,
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if (!isa<SCEVCouldNotCompute>(TC)) return TC;
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break;
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}
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case ICmpInst::ICMP_EQ: {
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// Convert to: while (X-Y == 0) // while (X == Y)
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case ICmpInst::ICMP_EQ: { // while (X == Y)
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// Convert to: while (X-Y == 0)
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const SCEV *TC = HowFarToNonZero(getMinusSCEV(LHS, RHS), L);
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if (!isa<SCEVCouldNotCompute>(TC)) return TC;
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break;
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@ -3986,7 +3986,7 @@ const SCEV *ScalarEvolution::getSCEVAtScope(const SCEV *V, const Loop *L) {
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getContext());
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else
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C = ConstantFoldInstOperands(I->getOpcode(), I->getType(),
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&Operands[0], Operands.size(),
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&Operands[0], Operands.size(),
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getContext());
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Pair.first->second = C;
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return getSCEV(C);
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@ -4235,7 +4235,7 @@ const SCEV *ScalarEvolution::HowFarToZero(const SCEV *V, const Loop *L) {
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// First, handle unitary steps.
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if (StepC->getValue()->equalsInt(1)) // 1*N = -Start (mod 2^BW), so:
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return getNegativeSCEV(Start); // N = -Start (as unsigned)
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return getNegativeSCEV(Start); // N = -Start (as unsigned)
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if (StepC->getValue()->isAllOnesValue()) // -1*N = -Start (mod 2^BW), so:
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return Start; // N = Start (as unsigned)
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@ -53,10 +53,9 @@ Value *SCEVExpander::InsertNoopCastOfTo(Value *V, const Type *Ty) {
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return CE->getOperand(0);
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}
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// FIXME: keep track of the cast instruction.
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if (Constant *C = dyn_cast<Constant>(V))
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return ConstantExpr::getCast(Op, C, Ty);
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if (Argument *A = dyn_cast<Argument>(V)) {
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// Check to see if there is already a cast!
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for (Value::use_iterator UI = A->use_begin(), E = A->use_end();
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@ -317,13 +316,17 @@ static void SplitAddRecs(SmallVectorImpl<const SCEV *> &Ops,
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}
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}
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/// expandAddToGEP - Expand a SCEVAddExpr with a pointer type into a GEP
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/// instead of using ptrtoint+arithmetic+inttoptr. This helps
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/// BasicAliasAnalysis and other passes analyze the result.
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/// expandAddToGEP - Expand an addition expression with a pointer type into
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/// a GEP instead of using ptrtoint+arithmetic+inttoptr. This helps
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/// BasicAliasAnalysis and other passes analyze the result. See the rules
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/// for getelementptr vs. inttoptr in
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/// http://llvm.org/docs/LangRef.html#pointeraliasing
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/// for details.
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///
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/// Design note: This depends on ScalarEvolution not recognizing inttoptr
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/// and ptrtoint operators, as they may introduce pointer arithmetic
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/// which may not be safely converted into getelementptr.
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/// Design note: The correctness of using getelmeentptr here depends on
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/// ScalarEvolution not recognizing inttoptr and ptrtoint operators, as
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/// they may introduce pointer arithmetic which may not be safely converted
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/// into getelementptr.
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///
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/// Design note: It might seem desirable for this function to be more
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/// loop-aware. If some of the indices are loop-invariant while others
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