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Implement value #'ing for vector operations, implementing 

Regression/Transforms/GCSE/vectorops.ll

llvm-svn: 27691
This commit is contained in:
Chris Lattner 2006-04-14 05:10:20 +00:00
parent 1c4ecc0c73
commit 68c650ca45
1 changed files with 38 additions and 32 deletions
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70
llvm/lib/Analysis/ValueNumbering.cpp
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@ -73,14 +73,18 @@ namespace {
std::vector<Value*> &RetVals;
BVNImpl(std::vector<Value*> &RV) : RetVals(RV) {}
void handleBinaryInst(Instruction &I);
void visitBinaryOperator(BinaryOperator &I) {
handleBinaryInst((Instruction&)I);
}
void visitGetElementPtrInst(GetElementPtrInst &I);
void visitCastInst(CastInst &I);
void visitShiftInst(ShiftInst &I) { handleBinaryInst((Instruction&)I); }
void visitSelectInst(SelectInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
void handleBinaryInst(Instruction &I);
void visitBinaryOperator(Instruction &I) { handleBinaryInst(I); }
void visitShiftInst(Instruction &I) { handleBinaryInst(I); }
void visitExtractElementInst(Instruction &I) { handleBinaryInst(I); }
void handleTernaryInst(Instruction &I);
void visitSelectInst(Instruction &I) { handleTernaryInst(I); }
void visitInsertElementInst(Instruction &I) { handleTernaryInst(I); }
void visitShuffleVectorInst(Instruction &I) { handleTernaryInst(I); }
void visitInstruction(Instruction &) {
// Cannot value number calls or terminator instructions.
}
@ -148,6 +152,24 @@ static inline bool isIdenticalBinaryInst(const Instruction &I1,
return false;
}
// isIdenticalTernaryInst - Return true if the two ternary instructions are
// identical.
//
static inline bool isIdenticalTernaryInst(const Instruction &I1,
const Instruction *I2) {
// Is it embedded in the same function? (This could be false if LHS
// is a constant or global!)
if (I1.getParent()->getParent() != I2->getParent()->getParent())
return false;
// They are identical if all operands are the same!
return I1.getOperand(0) == I2->getOperand(0) &&
I1.getOperand(1) == I2->getOperand(1) &&
I1.getOperand(2) == I2->getOperand(2);
}
void BVNImpl::handleBinaryInst(Instruction &I) {
Value *LHS = I.getOperand(0);
@ -199,37 +221,21 @@ void BVNImpl::visitGetElementPtrInst(GetElementPtrInst &I) {
}
}
// isIdenticalSelectInst - Return true if the two select instructions are
// identical.
//
static inline bool isIdenticalSelectInst(const SelectInst &I1,
const SelectInst *I2) {
// Is it embedded in the same function? (This could be false if LHS
// is a constant or global!)
if (I1.getParent()->getParent() != I2->getParent()->getParent())
return false;
void BVNImpl::handleTernaryInst(Instruction &I) {
Value *Op0 = I.getOperand(0);
Instruction *OtherInst;
// They are identical if both operands are the same!
return I1.getOperand(0) == I2->getOperand(0) &&
I1.getOperand(1) == I2->getOperand(1) &&
I1.getOperand(2) == I2->getOperand(2);
return true;
return false;
}
void BVNImpl::visitSelectInst(SelectInst &I) {
Value *Cond = I.getOperand(0);
for (Value::use_iterator UI = Cond->use_begin(), UE = Cond->use_end();
for (Value::use_iterator UI = Op0->use_begin(), UE = Op0->use_end();
UI != UE; ++UI)
if (SelectInst *Other = dyn_cast<SelectInst>(*UI))
if ((OtherInst = dyn_cast<Instruction>(*UI)) &&
OtherInst->getOpcode() == I.getOpcode()) {
// Check to see if this new select is not I, but has the same operands.
if (Other != &I && isIdenticalSelectInst(I, Other)) {
if (OtherInst != &I && isIdenticalTernaryInst(I, OtherInst)) {
// These instructions are identical. Handle the situation.
RetVals.push_back(Other);
RetVals.push_back(OtherInst);
}
}
}