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https://github.com/c64scene-ar/llvm-6502.git
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eb3d76da81
Move the test for this class into the IR unittests as well. This uncovers that ValueMap too is in the IR library. Ironically, the unittest for ValueMap is useless in the Support library (honestly, so was the ValueHandle test) and so it already lives in the IR unittests. Mmmm, tasty layering. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202821 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===-- llvm/Transforms/Utils/SimplifyIndVar.h - Indvar Utils ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines in interface for induction variable simplification. It does
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// not define any actual pass or policy, but provides a single function to
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// simplify a loop's induction variables based on ScalarEvolution.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H
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#define LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/Support/CommandLine.h"
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namespace llvm {
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class CastInst;
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class DominatorTree;
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class IVUsers;
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class Loop;
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class LPPassManager;
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class PHINode;
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class ScalarEvolution;
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/// Interface for visiting interesting IV users that are recognized but not
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/// simplified by this utility.
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class IVVisitor {
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protected:
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const DominatorTree *DT;
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bool ShouldSplitOverflowIntrinsics;
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virtual void anchor();
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public:
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IVVisitor(): DT(NULL), ShouldSplitOverflowIntrinsics(false) {}
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virtual ~IVVisitor() {}
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const DominatorTree *getDomTree() const { return DT; }
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bool shouldSplitOverflowInstrinsics() const {
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return ShouldSplitOverflowIntrinsics;
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}
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void setSplitOverflowIntrinsics() {
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ShouldSplitOverflowIntrinsics = true;
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assert(DT && "Splitting overflow intrinsics requires a DomTree.");
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}
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virtual void visitCast(CastInst *Cast) = 0;
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};
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/// simplifyUsersOfIV - Simplify instructions that use this induction variable
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/// by using ScalarEvolution to analyze the IV's recurrence.
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bool simplifyUsersOfIV(PHINode *CurrIV, ScalarEvolution *SE, LPPassManager *LPM,
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SmallVectorImpl<WeakVH> &Dead, IVVisitor *V = NULL);
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/// SimplifyLoopIVs - Simplify users of induction variables within this
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/// loop. This does not actually change or add IVs.
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bool simplifyLoopIVs(Loop *L, ScalarEvolution *SE, LPPassManager *LPM,
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SmallVectorImpl<WeakVH> &Dead);
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} // namespace llvm
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#endif
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