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Add support for performing GVNPRE on select instructions. This fixes test/Transforms/GVNPRE/select.ll. 

llvm-svn: 37783
This commit is contained in:
Owen Anderson 2007-06-28 23:51:21 +00:00
parent d630147c44
commit 8a9fa5d081
1 changed files with 57 additions and 13 deletions
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70
llvm/lib/Transforms/Scalar/GVNPRE.cpp
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@ -59,7 +59,7 @@ namespace {
FCMPOGT, FCMPOGE, FCMPOLT, FCMPOLE, FCMPONE,
FCMPORD, FCMPUNO, FCMPUEQ, FCMPUGT, FCMPUGE,
FCMPULT, FCMPULE, FCMPUNE, EXTRACT, INSERT,
SHUFFLE };
SHUFFLE, SELECT };
ExpressionOpcode opcode;
uint32_t firstVN;
@ -101,10 +101,11 @@ namespace {
Expression create_expression(ShuffleVectorInst* V);
Expression create_expression(ExtractElementInst* C);
Expression create_expression(InsertElementInst* V);
Expression create_expression(SelectInst* V);
public:
ValueTable() { nextValueNumber = 1; }
uint32_t lookup_or_add(Value* V);
uint32_t lookup(Value* V);
uint32_t lookup(Value* V) const;
void add(Value* V, uint32_t num);
void clear();
void erase(Value* v);
@ -279,6 +280,17 @@ ValueTable::Expression ValueTable::create_expression(InsertElementInst* I) {
return e;
}
ValueTable::Expression ValueTable::create_expression(SelectInst* I) {
Expression e;
e.firstVN = lookup_or_add(I->getCondition());
e.secondVN = lookup_or_add(I->getTrueValue());
e.thirdVN = lookup_or_add(I->getFalseValue());
e.opcode = Expression::SELECT;
return e;
}
//===----------------------------------------------------------------------===//
// ValueTable External Functions
//===----------------------------------------------------------------------===//
@ -346,6 +358,19 @@ uint32_t ValueTable::lookup_or_add(Value* V) {
} else if (InsertElementInst* U = dyn_cast<InsertElementInst>(V)) {
Expression e = create_expression(U);
std::map<Expression, uint32_t>::iterator EI = expressionNumbering.find(e);
if (EI != expressionNumbering.end()) {
valueNumbering.insert(std::make_pair(V, EI->second));
return EI->second;
} else {
expressionNumbering.insert(std::make_pair(e, nextValueNumber));
valueNumbering.insert(std::make_pair(V, nextValueNumber));
return nextValueNumber++;
}
} else if (SelectInst* U = dyn_cast<SelectInst>(V)) {
Expression e = create_expression(U);
std::map<Expression, uint32_t>::iterator EI = expressionNumbering.find(e);
if (EI != expressionNumbering.end()) {
valueNumbering.insert(std::make_pair(V, EI->second));
@ -364,7 +389,7 @@ uint32_t ValueTable::lookup_or_add(Value* V) {
/// lookup - Returns the value number of the specified value. Fails if
/// the value has not yet been numbered.
uint32_t ValueTable::lookup(Value* V) {
uint32_t ValueTable::lookup(Value* V) const {
DenseMap<Value*, uint32_t>::iterator VI = valueNumbering.find(V);
if (VI != valueNumbering.end())
return VI->second;
@ -579,7 +604,8 @@ Value* GVNPRE::phi_translate(Value* V, BasicBlock* pred, BasicBlock* succ) {
}
// Ternary Operations
} else if (isa<ShuffleVectorInst>(V) || isa<InsertElementInst>(V)) {
} else if (isa<ShuffleVectorInst>(V) || isa<InsertElementInst>(V) ||
isa<SelectInst>(V)) {
User* U = cast<User>(V);
Value* newOp1 = 0;
@ -619,6 +645,8 @@ Value* GVNPRE::phi_translate(Value* V, BasicBlock* pred, BasicBlock* succ) {
else if (InsertElementInst* I = dyn_cast<InsertElementInst>(U))
newVal = new InsertElementInst(newOp1, newOp2, newOp3,
I->getName()+".expr");
else if (SelectInst* I = dyn_cast<SelectInst>(U))
newVal = new SelectInst(newOp1, newOp2, newOp3, I->getName()+".expr");
uint32_t v = VN.lookup_or_add(newVal);
@ -700,7 +728,8 @@ void GVNPRE::clean(SmallPtrSet<Value*, 16>& set, BitVector& presentInSet) {
}
// Handle ternary ops
} else if (isa<ShuffleVectorInst>(v) || isa<InsertElementInst>(v)) {
} else if (isa<ShuffleVectorInst>(v) || isa<InsertElementInst>(v) ||
isa<SelectInst>(v)) {
User* U = cast<User>(v);
bool lhsValid = !isa<Instruction>(U->getOperand(0));
@ -759,7 +788,8 @@ void GVNPRE::topo_sort(SmallPtrSet<Value*, 16>& set, std::vector<Value*>& vec) {
}
// Handle ternary ops
} else if (isa<InsertElementInst>(e) || isa<ShuffleVectorInst>(e)) {
} else if (isa<InsertElementInst>(e) || isa<ShuffleVectorInst>(e) ||
isa<SelectInst>(e)) {
User* U = cast<User>(e);
Value* l = find_leader(set, VN.lookup(U->getOperand(0)));
Value* r = find_leader(set, VN.lookup(U->getOperand(1)));
@ -797,6 +827,7 @@ void GVNPRE::dump(const SmallPtrSet<Value*, 16>& s) const {
DOUT << "{ ";
for (SmallPtrSet<Value*, 16>::iterator I = s.begin(), E = s.end();
I != E; ++I) {
DOUT << "" << VN.lookup(*I) << ": ";
DEBUG((*I)->dump());
}
DOUT << "}\n\n";
@ -828,7 +859,7 @@ bool GVNPRE::elimination() {
if (isa<BinaryOperator>(BI) || isa<CmpInst>(BI) ||
isa<ShuffleVectorInst>(BI) || isa<InsertElementInst>(BI) ||
isa<ExtractElementInst>(BI)) {
isa<ExtractElementInst>(BI) || isa<SelectInst>(BI)) {
Value *leader = find_leader(availableOut[BB], VN.lookup(BI));
if (leader != 0)
@ -913,7 +944,8 @@ void GVNPRE::buildsets_availout(BasicBlock::iterator I,
}
// Handle ternary ops
} else if (isa<InsertElementInst>(I) || isa<ShuffleVectorInst>(I)) {
} else if (isa<InsertElementInst>(I) || isa<ShuffleVectorInst>(I) ||
isa<SelectInst>(I)) {
User* U = cast<User>(I);
Value* leftValue = U->getOperand(0);
Value* rightValue = U->getOperand(1);
@ -1157,7 +1189,8 @@ void GVNPRE::insertion_pre(Value* e, BasicBlock* BB,
isa<CmpInst>(U->getOperand(0)) ||
isa<ShuffleVectorInst>(U->getOperand(0)) ||
isa<ExtractElementInst>(U->getOperand(0)) ||
isa<InsertElementInst>(U->getOperand(0)))
isa<InsertElementInst>(U->getOperand(0)) ||
isa<SelectInst>(U->getOperand(0)))
s1 = find_leader(availableOut[*PI], VN.lookup(U->getOperand(0)));
else
s1 = U->getOperand(0);
@ -1167,7 +1200,8 @@ void GVNPRE::insertion_pre(Value* e, BasicBlock* BB,
isa<CmpInst>(U->getOperand(1)) ||
isa<ShuffleVectorInst>(U->getOperand(1)) ||
isa<ExtractElementInst>(U->getOperand(1)) ||
isa<InsertElementInst>(U->getOperand(1)))
isa<InsertElementInst>(U->getOperand(1)) ||
isa<SelectInst>(U->getOperand(1)))
s2 = find_leader(availableOut[*PI], VN.lookup(U->getOperand(1)));
else
s2 = U->getOperand(1);
@ -1175,12 +1209,14 @@ void GVNPRE::insertion_pre(Value* e, BasicBlock* BB,
// Ternary Operators
Value* s3 = 0;
if (isa<ShuffleVectorInst>(U) ||
isa<InsertElementInst>(U))
isa<InsertElementInst>(U) ||
isa<SelectInst>(U))
if (isa<BinaryOperator>(U->getOperand(2)) ||
isa<CmpInst>(U->getOperand(2)) ||
isa<ShuffleVectorInst>(U->getOperand(2)) ||
isa<ExtractElementInst>(U->getOperand(2)) ||
isa<InsertElementInst>(U->getOperand(2)))
isa<InsertElementInst>(U->getOperand(2)) ||
isa<SelectInst>(U->getOperand(2)))
s3 = find_leader(availableOut[*PI], VN.lookup(U->getOperand(2)));
else
s3 = U->getOperand(2);
@ -1203,6 +1239,11 @@ void GVNPRE::insertion_pre(Value* e, BasicBlock* BB,
else if (ExtractElementInst* S = dyn_cast<ExtractElementInst>(U))
newVal = new ExtractElementInst(s1, s2, S->getName()+".gvnpre",
(*PI)->getTerminator());
else if (SelectInst* S = dyn_cast<SelectInst>(U))
newVal = new SelectInst(S->getCondition(), S->getTrueValue(),
S->getFalseValue(), S->getName()+".gvnpre",
(*PI)->getTerminator());
VN.add(newVal, VN.lookup(U));
@ -1248,7 +1289,7 @@ unsigned GVNPRE::insertion_mergepoint(std::vector<Value*>& workList,
if (isa<BinaryOperator>(e) || isa<CmpInst>(e) ||
isa<ExtractElementInst>(e) || isa<InsertElementInst>(e) ||
isa<ShuffleVectorInst>(e)) {
isa<ShuffleVectorInst>(e) || isa<SelectInst>(e)) {
if (find_leader(availableOut[D->getIDom()->getBlock()],
VN.lookup(e)) != 0)
continue;
@ -1366,6 +1407,9 @@ bool GVNPRE::runOnFunction(Function &F) {
buildsets(F);
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI) {
DOUT << "AVAIL_OUT: " << FI->getName() << "\n";
dump(availableOut[FI]);
DOUT << "\n";
DOUT << "ANTIC_IN: " << FI->getName() << "\n";
dump(anticipatedIn[FI]);
DOUT << "\n\n";