WideIVInfo() : NarrowIV(0), WidestNativeType(0), IsSigned(false) {}
};
-
- class WideIVVisitor : public IVVisitor {
- ScalarEvolution *SE;
- const DataLayout *TD;
-
- public:
- WideIVInfo WI;
-
- WideIVVisitor(PHINode *NarrowIV, ScalarEvolution *SCEV,
- const DataLayout *TData, const DominatorTree *DTree):
- SE(SCEV), TD(TData) {
- DT = DTree;
- WI.NarrowIV = NarrowIV;
- }
-
- // Implement the interface used by simplifyUsersOfIV.
- virtual void visitCast(CastInst *Cast);
- };
}
/// visitCast - Update information about the induction variable that is
/// extended by this sign or zero extend operation. This is used to determine
/// the final width of the IV before actually widening it.
-void WideIVVisitor::visitCast(CastInst *Cast) {
+static void visitIVCast(CastInst *Cast, WideIVInfo &WI, ScalarEvolution *SE,
+ const DataLayout *TD) {
bool IsSigned = Cast->getOpcode() == Instruction::SExt;
if (!IsSigned && Cast->getOpcode() != Instruction::ZExt)
return;
return WidePhi;
}
+//===----------------------------------------------------------------------===//
+// Live IV Reduction - Minimize IVs live across the loop.
+//===----------------------------------------------------------------------===//
+
+
//===----------------------------------------------------------------------===//
// Simplification of IV users based on SCEV evaluation.
//===----------------------------------------------------------------------===//
+namespace {
+ class IndVarSimplifyVisitor : public IVVisitor {
+ ScalarEvolution *SE;
+ const DataLayout *TD;
+ PHINode *IVPhi;
+
+ public:
+ WideIVInfo WI;
+
+ IndVarSimplifyVisitor(PHINode *IV, ScalarEvolution *SCEV,
+ const DataLayout *TData, const DominatorTree *DTree):
+ SE(SCEV), TD(TData), IVPhi(IV) {
+ DT = DTree;
+ WI.NarrowIV = IVPhi;
+ if (ReduceLiveIVs)
+ setSplitOverflowIntrinsics();
+ }
+
+ // Implement the interface used by simplifyUsersOfIV.
+ virtual void visitCast(CastInst *Cast) { visitIVCast(Cast, WI, SE, TD); }
+ };
+}
/// SimplifyAndExtend - Iteratively perform simplification on a worklist of IV
/// users. Each successive simplification may push more users which may
PHINode *CurrIV = LoopPhis.pop_back_val();
// Information about sign/zero extensions of CurrIV.
- WideIVVisitor WIV(CurrIV, SE, TD, DT);
- if (ReduceLiveIVs)
- WIV.setSplitOverflowIntrinsics();
+ IndVarSimplifyVisitor Visitor(CurrIV, SE, TD, DT);
- Changed |= simplifyUsersOfIV(CurrIV, SE, &LPM, DeadInsts, &WIV);
+ Changed |= simplifyUsersOfIV(CurrIV, SE, &LPM, DeadInsts, &Visitor);
- if (WIV.WI.WidestNativeType) {
- WideIVs.push_back(WIV.WI);
+ if (Visitor.WI.WidestNativeType) {
+ WideIVs.push_back(Visitor.WI);
}
} while(!LoopPhis.empty());