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Minor cleanups so I can remove BasicValueNumbering.h

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3544 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-08-30 22:30:36 +00:00
parent d816bcfe40
commit 3e813b38f1
1 changed files with 45 additions and 16 deletions
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61
lib/Analysis/ValueNumbering.cpp
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@ -5,12 +5,12 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/BasicValueNumbering.h"
#include "llvm/Analysis/ValueNumbering.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/BasicBlock.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/iMemory.h"
#include "llvm/InstrTypes.h"
// Register the ValueNumbering interface, providing a nice name to refer to.
static RegisterAnalysisGroup<ValueNumbering> X("Value Numbering");
@ -23,36 +23,66 @@ static RegisterAnalysisGroup<ValueNumbering> X("Value Numbering");
ValueNumbering::~ValueNumbering() {}
//===----------------------------------------------------------------------===//
// BasicValueNumbering Pass Implementation
// Basic ValueNumbering Pass Implementation
//===----------------------------------------------------------------------===//
//
// Because of the way .a files work, the implementation of the
// BasicValueNumbering class MUST be in the ValueNumbering file itself, or else
// we run the risk of ValueNumbering being used, but the default implementation
// not being linked into the tool that uses it. As such, we register and
// implement the class here.
// Because of the way .a files work, the implementation of the BasicVN class
// MUST be in the ValueNumbering file itself, or else we run the risk of
// ValueNumbering being used, but the default implementation not being linked
// into the tool that uses it. As such, we register and implement the class
// here.
//
namespace {
/// BasicVN - This class is the default implementation of the ValueNumbering
/// interface. It walks the SSA def-use chains to trivially identify
/// lexically identical expressions. This does not require any ahead of time
/// analysis, so it is a very fast default implementation.
///
struct BasicVN : public FunctionPass, public ValueNumbering {
/// Pass Implementation stuff. This isn't much of a pass.
///
bool runOnFunction(Function &) { return false; }
/// getAnalysisUsage - Does not modify anything.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
/// getEqualNumberNodes - Return nodes with the same value number as the
/// specified Value. This fills in the argument vector with any equal
/// values.
///
/// This is where our implementation is.
///
virtual void getEqualNumberNodes(Value *V1,
std::vector<Value*> &RetVals) const;
};
// Register this pass...
RegisterOpt<BasicValueNumbering>
RegisterOpt<BasicVN>
X("basicvn", "Basic Value Numbering (default GVN impl)");
// Declare that we implement the ValueNumbering interface
RegisterAnalysisGroup<ValueNumbering, BasicValueNumbering, true> Y;
RegisterAnalysisGroup<ValueNumbering, BasicVN, true> Y;
} // End of anonymous namespace
namespace {
/// BVNImpl - Implement BasicValueNumbering in terms of a visitor class that
/// BVNImpl - Implement BasicVN in terms of a visitor class that
/// handles the different types of instructions as appropriate.
///
struct BVNImpl : public InstVisitor<BVNImpl> {
std::vector<Value*> &RetVals;
BVNImpl(std::vector<Value*> &RV) : RetVals(RV) {}
void visitBinaryOperator(Instruction &I);
void handleBinaryInst(Instruction &I);
void visitBinaryOperator(BinaryOperator &I) {
handleBinaryInst((Instruction&)I);
}
void visitGetElementPtrInst(GetElementPtrInst &I);
void visitCastInst(CastInst &I);
void visitShiftInst(ShiftInst &I) { visitBinaryOperator((Instruction&)I); }
void visitShiftInst(ShiftInst &I) { handleBinaryInst((Instruction&)I); }
void visitInstruction(Instruction &) {
// Cannot value number calls or terminator instructions...
}
@ -62,8 +92,7 @@ namespace {
// getEqualNumberNodes - Return nodes with the same value number as the
// specified Value. This fills in the argument vector with any equal values.
//
void BasicValueNumbering::getEqualNumberNodes(Value *V,
std::vector<Value*> &RetVals) const {
void BasicVN::getEqualNumberNodes(Value *V, std::vector<Value*> &RetVals) const{
assert(V->getType() != Type::VoidTy &&
"Can only value number non-void values!");
// We can only handle the case where I is an instruction!
@ -126,7 +155,7 @@ static inline bool isIdenticalBinaryInst(const Instruction &I1,
return false;
}
void BVNImpl::visitBinaryOperator(Instruction &I) {
void BVNImpl::handleBinaryInst(Instruction &I) {
Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);
Function *F = I.getParent()->getParent();