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Minor cleanups so I can remove BasicValueNumbering.h
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3544 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -5,12 +5,12 @@
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/BasicValueNumbering.h"
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#include "llvm/Analysis/ValueNumbering.h"
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#include "llvm/Support/InstVisitor.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Pass.h"
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#include "llvm/Type.h"
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#include "llvm/iMemory.h"
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#include "llvm/InstrTypes.h"
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// Register the ValueNumbering interface, providing a nice name to refer to.
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static RegisterAnalysisGroup<ValueNumbering> X("Value Numbering");
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@ -23,36 +23,66 @@ static RegisterAnalysisGroup<ValueNumbering> X("Value Numbering");
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ValueNumbering::~ValueNumbering() {}
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//===----------------------------------------------------------------------===//
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// BasicValueNumbering Pass Implementation
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// Basic ValueNumbering Pass Implementation
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//===----------------------------------------------------------------------===//
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//
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// Because of the way .a files work, the implementation of the
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// BasicValueNumbering class MUST be in the ValueNumbering file itself, or else
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// we run the risk of ValueNumbering being used, but the default implementation
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// not being linked into the tool that uses it. As such, we register and
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// implement the class here.
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// Because of the way .a files work, the implementation of the BasicVN class
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// MUST be in the ValueNumbering file itself, or else we run the risk of
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// ValueNumbering being used, but the default implementation not being linked
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// into the tool that uses it. As such, we register and implement the class
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// here.
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//
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namespace {
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/// BasicVN - This class is the default implementation of the ValueNumbering
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/// interface. It walks the SSA def-use chains to trivially identify
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/// lexically identical expressions. This does not require any ahead of time
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/// analysis, so it is a very fast default implementation.
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///
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struct BasicVN : public FunctionPass, public ValueNumbering {
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/// Pass Implementation stuff. This isn't much of a pass.
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///
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bool runOnFunction(Function &) { return false; }
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/// getAnalysisUsage - Does not modify anything.
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///
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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/// getEqualNumberNodes - Return nodes with the same value number as the
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/// specified Value. This fills in the argument vector with any equal
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/// values.
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///
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/// This is where our implementation is.
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///
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virtual void getEqualNumberNodes(Value *V1,
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std::vector<Value*> &RetVals) const;
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};
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// Register this pass...
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RegisterOpt<BasicValueNumbering>
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RegisterOpt<BasicVN>
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X("basicvn", "Basic Value Numbering (default GVN impl)");
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// Declare that we implement the ValueNumbering interface
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RegisterAnalysisGroup<ValueNumbering, BasicValueNumbering, true> Y;
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RegisterAnalysisGroup<ValueNumbering, BasicVN, true> Y;
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} // End of anonymous namespace
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namespace {
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/// BVNImpl - Implement BasicValueNumbering in terms of a visitor class that
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/// BVNImpl - Implement BasicVN in terms of a visitor class that
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/// handles the different types of instructions as appropriate.
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///
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struct BVNImpl : public InstVisitor<BVNImpl> {
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std::vector<Value*> &RetVals;
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BVNImpl(std::vector<Value*> &RV) : RetVals(RV) {}
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void visitBinaryOperator(Instruction &I);
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void handleBinaryInst(Instruction &I);
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void visitBinaryOperator(BinaryOperator &I) {
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handleBinaryInst((Instruction&)I);
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}
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void visitGetElementPtrInst(GetElementPtrInst &I);
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void visitCastInst(CastInst &I);
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void visitShiftInst(ShiftInst &I) { visitBinaryOperator((Instruction&)I); }
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void visitShiftInst(ShiftInst &I) { handleBinaryInst((Instruction&)I); }
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void visitInstruction(Instruction &) {
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// Cannot value number calls or terminator instructions...
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}
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@ -62,8 +92,7 @@ namespace {
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// getEqualNumberNodes - Return nodes with the same value number as the
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// specified Value. This fills in the argument vector with any equal values.
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//
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void BasicValueNumbering::getEqualNumberNodes(Value *V,
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std::vector<Value*> &RetVals) const {
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void BasicVN::getEqualNumberNodes(Value *V, std::vector<Value*> &RetVals) const{
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assert(V->getType() != Type::VoidTy &&
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"Can only value number non-void values!");
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// We can only handle the case where I is an instruction!
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@ -126,7 +155,7 @@ static inline bool isIdenticalBinaryInst(const Instruction &I1,
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return false;
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}
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void BVNImpl::visitBinaryOperator(Instruction &I) {
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void BVNImpl::handleBinaryInst(Instruction &I) {
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Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);
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Function *F = I.getParent()->getParent();
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