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Refactor some code to expose an interface to constant fold and instruction given it's opcode, typeand operands.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28517 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-05-27 01:18:04 +00:00
parent b5a554ec80
commit 4b30fcb5f5
1 changed files with 49 additions and 35 deletions
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84
lib/Transforms/Utils/Local.cpp
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@ -64,18 +64,6 @@ Constant *llvm::ConstantFoldInstruction(Instruction *I) {
// If we reach here, all incoming values are the same constant.
return Result;
} else if (CallInst *CI = dyn_cast<CallInst>(I)) {
if (Function *F = CI->getCalledFunction())
if (canConstantFoldCallTo(F)) {
std::vector<Constant*> Args;
for (unsigned i = 1, e = CI->getNumOperands(); i != e; ++i)
if (Constant *Op = dyn_cast<Constant>(CI->getOperand(i)))
Args.push_back(Op);
else
return 0;
return ConstantFoldCall(F, Args);
}
return 0;
}
Constant *Op0 = 0, *Op1 = 0;
@ -91,37 +79,63 @@ Constant *llvm::ConstantFoldInstruction(Instruction *I) {
case 0: return 0;
}
if (isa<BinaryOperator>(I) || isa<ShiftInst>(I))
return ConstantExpr::get(I->getOpcode(), Op0, Op1);
if (isa<BinaryOperator>(I) || isa<ShiftInst>(I)) {
if (Constant *Op0 = dyn_cast<Constant>(I->getOperand(0)))
if (Constant *Op1 = dyn_cast<Constant>(I->getOperand(1)))
return ConstantExpr::get(I->getOpcode(), Op0, Op1);
return 0; // Operands not constants.
}
switch (I->getOpcode()) {
// Scan the operand list, checking to see if the are all constants, if so,
// hand off to ConstantFoldInstOperands.
std::vector<Constant*> Ops;
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (Constant *Op = dyn_cast<Constant>(I->getOperand(i)))
Ops.push_back(Op);
else
return 0; // All operands not constant!
return ConstantFoldInstOperands(I->getOpcode(), I->getType(), Ops);
}
/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the
/// specified opcode and operands. If successful, the constant result is
/// returned, if not, null is returned. Note that this function can fail when
/// attempting to fold instructions like loads and stores, which have no
/// constant expression form.
///
Constant *llvm::ConstantFoldInstOperands(unsigned Opc, const Type *DestTy,
const std::vector<Constant*> &Ops) {
if (Opc >= Instruction::BinaryOpsBegin && Opc < Instruction::BinaryOpsEnd)
return ConstantExpr::get(Opc, Ops[0], Ops[1]);
switch (Opc) {
default: return 0;
case Instruction::Call:
if (Function *F = dyn_cast<Function>(Ops[0])) {
if (canConstantFoldCallTo(F)) {
std::vector<Constant*> Args(Ops.begin()+1, Ops.end());
return ConstantFoldCall(F, Args);
}
}
return 0;
case Instruction::Shl:
case Instruction::Shr:
return ConstantExpr::get(Opc, Ops[0], Ops[1]);
case Instruction::Cast:
return ConstantExpr::getCast(Op0, I->getType());
return ConstantExpr::getCast(Ops[0], DestTy);
case Instruction::Select:
if (Constant *Op2 = dyn_cast<Constant>(I->getOperand(2)))
return ConstantExpr::getSelect(Op0, Op1, Op2);
return 0;
return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
case Instruction::ExtractElement:
return ConstantExpr::getExtractElement(Op0, Op1);
return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
case Instruction::InsertElement:
if (Constant *Op2 = dyn_cast<Constant>(I->getOperand(2)))
return ConstantExpr::getInsertElement(Op0, Op1, Op2);
return 0;
return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
case Instruction::ShuffleVector:
if (Constant *Op2 = dyn_cast<Constant>(I->getOperand(2)))
return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
return 0;
return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
case Instruction::GetElementPtr:
std::vector<Constant*> IdxList;
IdxList.reserve(I->getNumOperands()-1);
if (Op1) IdxList.push_back(Op1);
for (unsigned i = 2, e = I->getNumOperands(); i != e; ++i)
if (Constant *C = dyn_cast<Constant>(I->getOperand(i)))
IdxList.push_back(C);
else
return 0; // Non-constant operand
return ConstantExpr::getGetElementPtr(Op0, IdxList);
return ConstantExpr::getGetElementPtr(Ops[0],
std::vector<Constant*>(Ops.begin()+1,
Ops.end()));
}
}