#define INSTCOMBINE_INSTCOMBINE_H
#include "InstCombineWorklist.h"
+#include "llvm/Operator.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/IRBuilder.h"
: public FunctionPass,
public InstVisitor<InstCombiner, Instruction*> {
TargetData *TD;
- bool MustPreserveLCSSA;
bool MadeIRChange;
public:
/// Worklist - All of the instructions that need to be simplified.
BuilderTy *Builder;
static char ID; // Pass identification, replacement for typeid
- InstCombiner() : FunctionPass(&ID), TD(0), Builder(0) {}
+ InstCombiner() : FunctionPass(ID), TD(0), Builder(0) {
+ initializeInstCombinerPass(*PassRegistry::getPassRegistry());
+ }
public:
virtual bool runOnFunction(Function &F);
ConstantInt *RHS);
Instruction *FoldICmpDivCst(ICmpInst &ICI, BinaryOperator *DivI,
ConstantInt *DivRHS);
+ Instruction *FoldICmpShrCst(ICmpInst &ICI, BinaryOperator *DivI,
+ ConstantInt *DivRHS);
Instruction *FoldICmpAddOpCst(ICmpInst &ICI, Value *X, ConstantInt *CI,
ICmpInst::Predicate Pred, Value *TheAdd);
Instruction *FoldGEPICmp(GEPOperator *GEPLHS, Value *RHS,
Instruction *transformCallThroughTrampoline(CallSite CS);
Instruction *transformZExtICmp(ICmpInst *ICI, Instruction &CI,
bool DoXform = true);
+ Instruction *transformSExtICmp(ICmpInst *ICI, Instruction &CI);
bool WillNotOverflowSignedAdd(Value *LHS, Value *RHS);
- DbgDeclareInst *hasOneUsePlusDeclare(Value *V);
Value *EmitGEPOffset(User *GEP);
public:
Worklist.Add(New);
return New;
}
-
+
+ // InsertNewInstWith - same as InsertNewInstBefore, but also sets the
+ // debug loc.
+ //
+ Instruction *InsertNewInstWith(Instruction *New, Instruction &Old) {
+ New->setDebugLoc(Old.getDebugLoc());
+ return InsertNewInstBefore(New, Old);
+ }
+
// ReplaceInstUsesWith - This method is to be used when an instruction is
// found to be dead, replacable with another preexisting expression. Here
// we add all uses of I to the worklist, replace all uses of I with the new
// segment of unreachable code, so just clobber the instruction.
if (&I == V)
V = UndefValue::get(I.getType());
-
+
+ DEBUG(errs() << "IC: Replacing " << I << "\n"
+ " with " << *V << '\n');
+
I.replaceAllUsesWith(V);
return &I;
}
private:
- /// SimplifyCommutative - This performs a few simplifications for
- /// commutative operators.
- bool SimplifyCommutative(BinaryOperator &I);
+ /// SimplifyAssociativeOrCommutative - This performs a few simplifications for
+ /// operators which are associative or commutative.
+ bool SimplifyAssociativeOrCommutative(BinaryOperator &I);
+
+ /// SimplifyUsingDistributiveLaws - This tries to simplify binary operations
+ /// which some other binary operation distributes over either by factorizing
+ /// out common terms (eg "(A*B)+(A*C)" -> "A*(B+C)") or expanding out if this
+ /// results in simplifications (eg: "A & (B | C) -> (A&B) | (A&C)" if this is
+ /// a win). Returns the simplified value, or null if it didn't simplify.
+ Value *SimplifyUsingDistributiveLaws(BinaryOperator &I);
/// SimplifyDemandedUseBits - Attempts to replace V with a simpler value
/// based on the demanded bits.
// into the PHI (which is only possible if all operands to the PHI are
// constants).
//
- // If AllowAggressive is true, FoldOpIntoPhi will allow certain transforms
- // that would normally be unprofitable because they strongly encourage jump
- // threading.
- Instruction *FoldOpIntoPhi(Instruction &I, bool AllowAggressive = false);
+ Instruction *FoldOpIntoPhi(Instruction &I);
// FoldPHIArgOpIntoPHI - If all operands to a PHI node are the same "unary"
// operator and they all are only used by the PHI, PHI together their
Value *EvaluateInDifferentType(Value *V, const Type *Ty, bool isSigned);
-
- unsigned GetOrEnforceKnownAlignment(Value *V,
- unsigned PrefAlign = 0);
-
};