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Lower target intrinsics into an INTRINSIC node

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27035 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-24 02:22:33 +00:00
parent 019a0a9725
commit 0eade319cd
1 changed files with 80 additions and 4 deletions
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84
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -481,6 +481,7 @@ public:
void visitCall(CallInst &I);
void visitInlineAsm(CallInst &I);
const char *visitIntrinsicCall(CallInst &I, unsigned Intrinsic);
void visitTargetIntrinsic(CallInst &I, unsigned Intrinsic);
void visitVAStart(CallInst &I);
void visitVAArg(VAArgInst &I);
@ -1001,12 +1002,91 @@ void SelectionDAGLowering::visitStore(StoreInst &I) {
DAG.getSrcValue(I.getOperand(1))));
}
/// IntrinsicCannotAccessMemory - Return true if the specified intrinsic cannot
/// access memory and has no other side effects at all.
static bool IntrinsicCannotAccessMemory(unsigned IntrinsicID) {
#define GET_NO_MEMORY_INTRINSICS
#include "llvm/Intrinsics.gen"
#undef GET_NO_MEMORY_INTRINSICS
return false;
}
/// visitTargetIntrinsic - Lower a call of a target intrinsic to an INTRINSIC
/// node.
void SelectionDAGLowering::visitTargetIntrinsic(CallInst &I,
unsigned Intrinsic) {
bool HasChain = IntrinsicCannotAccessMemory(Intrinsic);
// Build the operand list.
std::vector<SDOperand> Ops;
if (HasChain) // If this intrinsic has side-effects, chainify it.
Ops.push_back(getRoot());
// Add the intrinsic ID as an integer operand.
Ops.push_back(DAG.getConstant(Intrinsic, TLI.getPointerTy()));
// Add all operands of the call to the operand list.
for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) {
SDOperand Op = getValue(I.getOperand(i));
// If this is a vector type, force it to the right packed type.
if (Op.getValueType() == MVT::Vector) {
const PackedType *OpTy = cast<PackedType>(I.getOperand(i)->getType());
MVT::ValueType EltVT = TLI.getValueType(OpTy->getElementType());
MVT::ValueType VVT = MVT::getVectorType(EltVT, OpTy->getNumElements());
assert(VVT != MVT::Other && "Intrinsic uses a non-legal type?");
Op = DAG.getNode(ISD::VBIT_CONVERT, VVT, Op);
}
assert(TLI.isTypeLegal(Op.getValueType()) &&
"Intrinsic uses a non-legal type?");
Ops.push_back(Op);
}
std::vector<MVT::ValueType> VTs;
if (I.getType() != Type::VoidTy) {
MVT::ValueType VT = TLI.getValueType(I.getType());
if (VT == MVT::Vector) {
const PackedType *DestTy = cast<PackedType>(I.getType());
MVT::ValueType EltVT = TLI.getValueType(DestTy->getElementType());
VT = MVT::getVectorType(EltVT, DestTy->getNumElements());
assert(VT != MVT::Other && "Intrinsic uses a non-legal type?");
}
assert(TLI.isTypeLegal(VT) && "Intrinsic uses a non-legal type?");
VTs.push_back(VT);
}
if (HasChain)
VTs.push_back(MVT::Other);
// Create the node.
SDOperand Result = DAG.getNode(ISD::INTRINSIC, VTs, Ops);
if (HasChain)
DAG.setRoot(Result.getValue(Result.Val->getNumValues()-1));
if (I.getType() != Type::VoidTy) {
if (const PackedType *PTy = dyn_cast<PackedType>(I.getType())) {
MVT::ValueType EVT = TLI.getValueType(PTy->getElementType());
Result = DAG.getNode(ISD::VBIT_CONVERT, MVT::Vector, Result,
DAG.getConstant(PTy->getNumElements(), MVT::i32),
DAG.getValueType(EVT));
}
setValue(&I, Result);
}
}
/// visitIntrinsicCall - Lower the call to the specified intrinsic function. If
/// we want to emit this as a call to a named external function, return the name
/// otherwise lower it and return null.
const char *
SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
switch (Intrinsic) {
default:
// By default, turn this into a target intrinsic node.
visitTargetIntrinsic(I, Intrinsic);
return 0;
case Intrinsic::vastart: visitVAStart(I); return 0;
case Intrinsic::vaend: visitVAEnd(I); return 0;
case Intrinsic::vacopy: visitVACopy(I); return 0;
@ -1194,10 +1274,6 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
case Intrinsic::prefetch:
// FIXME: Currently discarding prefetches.
return 0;
default:
std::cerr << I;
assert(0 && "This intrinsic is not implemented yet!");
return 0;
}
}