/// node list.
SelectionDAG::allnodes_iterator ISelPosition;
-/// IsChainCompatible - Returns true if Chain is Op or Chain does
-/// not reach Op.
-static bool IsChainCompatible(SDNode *Chain, SDNode *Op) {
+/// ChainNotReachable - Returns true if Chain does not reach Op.
+static bool ChainNotReachable(SDNode *Chain, SDNode *Op) {
if (Chain->getOpcode() == ISD::EntryToken)
return true;
- else if (Chain->getOpcode() == ISD::TokenFactor)
+ if (Chain->getOpcode() == ISD::TokenFactor)
return false;
- else if (Chain->getNumOperands() > 0) {
+ if (Chain->getNumOperands() > 0) {
SDValue C0 = Chain->getOperand(0);
if (C0.getValueType() == MVT::Other)
- return C0.getNode() != Op && IsChainCompatible(C0.getNode(), Op);
+ return C0.getNode() != Op && ChainNotReachable(C0.getNode(), Op);
}
return true;
}
+/// IsChainCompatible - Returns true if Chain is Op or Chain does not reach Op.
+/// This is used to ensure that there are no nodes trapped between Chain, which
+/// is the first chain node discovered in a pattern and Op, a later node, that
+/// will not be selected into the pattern.
+static bool IsChainCompatible(SDNode *Chain, SDNode *Op) {
+ return Chain == Op || ChainNotReachable(Chain, Op);
+}
+
+
/// ISelUpdater - helper class to handle updates of the
/// instruciton selection graph.
class VISIBILITY_HIDDEN ISelUpdater : public SelectionDAG::DAGUpdateListener {
/// ReplaceUses - replace all uses of the old node F with the use
/// of the new node T.
-void ReplaceUses(SDValue F, SDValue T) DISABLE_INLINE {
+DISABLE_INLINE void ReplaceUses(SDValue F, SDValue T) {
ISelUpdater ISU(ISelPosition);
CurDAG->ReplaceAllUsesOfValueWith(F, T, &ISU);
}
/// ReplaceUses - replace all uses of the old nodes F with the use
/// of the new nodes T.
-void ReplaceUses(const SDValue *F, const SDValue *T,
- unsigned Num) DISABLE_INLINE {
+DISABLE_INLINE void ReplaceUses(const SDValue *F, const SDValue *T,
+ unsigned Num) {
ISelUpdater ISU(ISelPosition);
CurDAG->ReplaceAllUsesOfValuesWith(F, T, Num, &ISU);
}
/// ReplaceUses - replace all uses of the old node F with the use
/// of the new node T.
-void ReplaceUses(SDNode *F, SDNode *T) DISABLE_INLINE {
- unsigned FNumVals = F->getNumValues();
- unsigned TNumVals = T->getNumValues();
+DISABLE_INLINE void ReplaceUses(SDNode *F, SDNode *T) {
ISelUpdater ISU(ISelPosition);
- if (FNumVals != TNumVals) {
- for (unsigned i = 0, e = std::min(FNumVals, TNumVals); i < e; ++i)
- CurDAG->ReplaceAllUsesOfValueWith(SDValue(F, i), SDValue(T, i), &ISU);
- } else {
- CurDAG->ReplaceAllUsesWith(F, T, &ISU);
- }
+ CurDAG->ReplaceAllUsesWith(F, T, &ISU);
}
/// SelectRoot - Top level entry to DAG instruction selector.
// a reference to the root node, preventing it from being deleted,
// and tracking any changes of the root.
HandleSDNode Dummy(CurDAG->getRoot());
- ISelPosition = next(SelectionDAG::allnodes_iterator(CurDAG->getRoot().getNode()));
+ ISelPosition = SelectionDAG::allnodes_iterator(CurDAG->getRoot().getNode());
+ ++ISelPosition;
// The AllNodes list is now topological-sorted. Visit the
// nodes by starting at the end of the list (the root of the
// makes it theoretically possible to disable the DAGCombiner.
if (Node->use_empty())
continue;
-#if 0
- DAG.setSubgraphColor(Node, "red");
-#endif
- SDNode *ResNode = Select(SDValue(Node, 0));
- // If node should not be replaced,
- // continue with the next one.
+
+ SDNode *ResNode = Select(Node);
+ // If node should not be replaced, continue with the next one.
if (ResNode == Node)
continue;
// Replace node.
- if (ResNode) {
-#if 0
- DAG.setSubgraphColor(ResNode, "yellow");
- DAG.setSubgraphColor(ResNode, "black");
-#endif
+ if (ResNode)
ReplaceUses(Node, ResNode);
- }
+
// If after the replacement this node is not used any more,
// remove this dead node.
if (Node->use_empty()) { // Don't delete EntryToken, etc.
CurDAG->setRoot(Dummy.getValue());
}
+
+/// CheckInteger - Return true if the specified node is not a ConstantSDNode or
+/// if it doesn't have the specified value.
+static bool CheckInteger(SDValue V, int64_t Val) {
+ ConstantSDNode *C = dyn_cast<ConstantSDNode>(V);
+ return C == 0 || C->getSExtValue() != Val;
+}
+
+/// CheckAndImmediate - Check to see if the specified node is an and with an
+/// immediate returning true on failure.
+///
+/// FIXME: Inline this gunk into CheckAndMask.
+bool CheckAndImmediate(SDValue V, int64_t Val) {
+ if (V->getOpcode() == ISD::AND)
+ if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(V->getOperand(1)))
+ if (CheckAndMask(V.getOperand(0), C, Val))
+ return false;
+ return true;
+}
+
+/// CheckOrImmediate - Check to see if the specified node is an or with an
+/// immediate returning true on failure.
+///
+/// FIXME: Inline this gunk into CheckOrMask.
+bool CheckOrImmediate(SDValue V, int64_t Val) {
+ if (V->getOpcode() == ISD::OR)
+ if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(V->getOperand(1)))
+ if (CheckOrMask(V.getOperand(0), C, Val))
+ return false;
+ return true;
+}
+
+void EmitInteger(int64_t Val, MVT::SimpleValueType VT,
+ SmallVectorImpl<SDValue> &RecordedNodes) {
+ RecordedNodes.push_back(CurDAG->getTargetConstant(Val, VT));
+}
+
+// These functions are marked always inline so that Idx doesn't get pinned to
+// the stack.
+ALWAYS_INLINE static int8_t
+GetInt1(const unsigned char *MatcherTable, unsigned &Idx) {
+ return MatcherTable[Idx++];
+}
+
+ALWAYS_INLINE static int16_t
+GetInt2(const unsigned char *MatcherTable, unsigned &Idx) {
+ int16_t Val = (uint8_t)GetInt1(MatcherTable, Idx);
+ Val |= int16_t(GetInt1(MatcherTable, Idx)) << 8;
+ return Val;
+}
+
+ALWAYS_INLINE static int32_t
+GetInt4(const unsigned char *MatcherTable, unsigned &Idx) {
+ int32_t Val = (uint16_t)GetInt2(MatcherTable, Idx);
+ Val |= int32_t(GetInt2(MatcherTable, Idx)) << 16;
+ return Val;
+}
+
+ALWAYS_INLINE static int64_t
+GetInt8(const unsigned char *MatcherTable, unsigned &Idx) {
+ int64_t Val = (uint32_t)GetInt4(MatcherTable, Idx);
+ Val |= int64_t(GetInt4(MatcherTable, Idx)) << 32;
+ return Val;
+}
+
+/// GetVBR - decode a vbr encoding whose top bit is set.
+ALWAYS_INLINE static unsigned
+GetVBR(unsigned Val, const unsigned char *MatcherTable, unsigned &Idx) {
+ assert(Val >= 128 && "Not a VBR");
+ Val &= 127; // Remove first vbr bit.
+
+ unsigned Shift = 7;
+ unsigned NextBits;
+ do {
+ NextBits = GetInt1(MatcherTable, Idx);
+ Val |= (NextBits&127) << Shift;
+ Shift += 7;
+ } while (NextBits & 128);
+
+ return Val;
+}
+
+
+enum BuiltinOpcodes {
+ OPC_Push, OPC_Push2,
+ OPC_RecordNode,
+ OPC_RecordMemRef,
+ OPC_CaptureFlagInput,
+ OPC_MoveChild,
+ OPC_MoveParent,
+ OPC_CheckSame,
+ OPC_CheckPatternPredicate,
+ OPC_CheckPredicate,
+ OPC_CheckOpcode,
+ OPC_CheckMultiOpcode,
+ OPC_CheckType,
+ OPC_CheckInteger1, OPC_CheckInteger2, OPC_CheckInteger4, OPC_CheckInteger8,
+ OPC_CheckCondCode,
+ OPC_CheckValueType,
+ OPC_CheckComplexPat,
+ OPC_CheckAndImm1, OPC_CheckAndImm2, OPC_CheckAndImm4, OPC_CheckAndImm8,
+ OPC_CheckOrImm1, OPC_CheckOrImm2, OPC_CheckOrImm4, OPC_CheckOrImm8,
+ OPC_CheckFoldableChainNode,
+ OPC_CheckChainCompatible,
+
+ OPC_EmitInteger1, OPC_EmitInteger2, OPC_EmitInteger4, OPC_EmitInteger8,
+ OPC_EmitRegister,
+ OPC_EmitConvertToTarget,
+ OPC_EmitMergeInputChains,
+ OPC_EmitCopyToReg,
+ OPC_EmitNodeXForm,
+ OPC_EmitNode,
+ OPC_CompleteMatch
+};
+
+enum {
+ OPFL_None = 0, // Node has no chain or flag input and isn't variadic.
+ OPFL_Chain = 1, // Node has a chain input.
+ OPFL_Flag = 2, // Node has a flag input.
+ OPFL_MemRefs = 4, // Node gets accumulated MemRefs.
+ OPFL_Variadic0 = 1<<3, // Node is variadic, root has 0 fixed inputs.
+ OPFL_Variadic1 = 2<<3, // Node is variadic, root has 1 fixed inputs.
+ OPFL_Variadic2 = 3<<3, // Node is variadic, root has 2 fixed inputs.
+ OPFL_Variadic3 = 4<<3, // Node is variadic, root has 3 fixed inputs.
+ OPFL_Variadic4 = 5<<3, // Node is variadic, root has 4 fixed inputs.
+ OPFL_Variadic5 = 6<<3, // Node is variadic, root has 5 fixed inputs.
+ OPFL_Variadic6 = 7<<3, // Node is variadic, root has 6 fixed inputs.
+
+ OPFL_VariadicInfo = OPFL_Variadic6
+};
+
+/// getNumFixedFromVariadicInfo - Transform an EmitNode flags word into the
+/// number of fixed arity values that should be skipped when copying from the
+/// root.
+static inline int getNumFixedFromVariadicInfo(unsigned Flags) {
+ return ((Flags&OPFL_VariadicInfo) >> 3)-1;
+}
+
+struct MatchScope {
+ /// FailIndex - If this match fails, this is the index to continue with.
+ unsigned FailIndex;
+
+ /// NodeStackSize - The size of the node stack when the scope was formed.
+ unsigned NodeStackSize;
+
+ /// NumRecordedNodes - The number of recorded nodes when the scope was formed.
+ unsigned NumRecordedNodes;
+
+ /// NumMatchedMemRefs - The number of matched memref entries.
+ unsigned NumMatchedMemRefs;
+
+ /// InputChain/InputFlag - The current chain/flag
+ SDValue InputChain, InputFlag;
+
+ /// HasChainNodesMatched - True if the ChainNodesMatched list is non-empty.
+ bool HasChainNodesMatched;
+};
+
+SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
+ unsigned TableSize) {
+ // FIXME: Should these even be selected? Handle these cases in the caller?
+ switch (NodeToMatch->getOpcode()) {
+ default:
+ break;
+ case ISD::EntryToken: // These nodes remain the same.
+ case ISD::BasicBlock:
+ case ISD::Register:
+ case ISD::HANDLENODE:
+ case ISD::TargetConstant:
+ case ISD::TargetConstantFP:
+ case ISD::TargetConstantPool:
+ case ISD::TargetFrameIndex:
+ case ISD::TargetExternalSymbol:
+ case ISD::TargetBlockAddress:
+ case ISD::TargetJumpTable:
+ case ISD::TargetGlobalTLSAddress:
+ case ISD::TargetGlobalAddress:
+ case ISD::TokenFactor:
+ case ISD::CopyFromReg:
+ case ISD::CopyToReg:
+ return 0;
+ case ISD::AssertSext:
+ case ISD::AssertZext:
+ ReplaceUses(SDValue(NodeToMatch, 0), NodeToMatch->getOperand(0));
+ return 0;
+ case ISD::INLINEASM: return Select_INLINEASM(NodeToMatch);
+ case ISD::EH_LABEL: return Select_EH_LABEL(NodeToMatch);
+ case ISD::UNDEF: return Select_UNDEF(NodeToMatch);
+ }
+
+ assert(!NodeToMatch->isMachineOpcode() && "Node already selected!");
+
+ // Set up the node stack with NodeToMatch as the only node on the stack.
+ SmallVector<SDValue, 8> NodeStack;
+ SDValue N = SDValue(NodeToMatch, 0);
+ NodeStack.push_back(N);
+
+ // MatchScopes - Scopes used when matching, if a match failure happens, this
+ // indicates where to continue checking.
+ SmallVector<MatchScope, 8> MatchScopes;
+
+ // RecordedNodes - This is the set of nodes that have been recorded by the
+ // state machine.
+ SmallVector<SDValue, 8> RecordedNodes;
+
+ // MatchedMemRefs - This is the set of MemRef's we've seen in the input
+ // pattern.
+ SmallVector<MachineMemOperand*, 2> MatchedMemRefs;
+
+ // These are the current input chain and flag for use when generating nodes.
+ // Various Emit operations change these. For example, emitting a copytoreg
+ // uses and updates these.
+ SDValue InputChain, InputFlag;
+
+ // ChainNodesMatched - If a pattern matches nodes that have input/output
+ // chains, the OPC_EmitMergeInputChains operation is emitted which indicates
+ // which ones they are. The result is captured into this list so that we can
+ // update the chain results when the pattern is complete.
+ SmallVector<SDNode*, 3> ChainNodesMatched;
+
+ DEBUG(errs() << "ISEL: Starting pattern match on root node: ";
+ NodeToMatch->dump(CurDAG);
+ errs() << '\n');
+
+ // Interpreter starts at opcode #0.
+ unsigned MatcherIndex = 0;
+ while (1) {
+ assert(MatcherIndex < TableSize && "Invalid index");
+ switch ((BuiltinOpcodes)MatcherTable[MatcherIndex++]) {
+ case OPC_Push: {
+ unsigned NumToSkip = MatcherTable[MatcherIndex++];
+ MatchScope NewEntry;
+ NewEntry.FailIndex = MatcherIndex+NumToSkip;
+ NewEntry.NodeStackSize = NodeStack.size();
+ NewEntry.NumRecordedNodes = RecordedNodes.size();
+ NewEntry.NumMatchedMemRefs = MatchedMemRefs.size();
+ NewEntry.InputChain = InputChain;
+ NewEntry.InputFlag = InputFlag;
+ NewEntry.HasChainNodesMatched = !ChainNodesMatched.empty();
+ MatchScopes.push_back(NewEntry);
+ continue;
+ }
+ case OPC_Push2: {
+ unsigned NumToSkip = GetInt2(MatcherTable, MatcherIndex);
+ MatchScope NewEntry;
+ NewEntry.FailIndex = MatcherIndex+NumToSkip;
+ NewEntry.NodeStackSize = NodeStack.size();
+ NewEntry.NumRecordedNodes = RecordedNodes.size();
+ NewEntry.NumMatchedMemRefs = MatchedMemRefs.size();
+ NewEntry.InputChain = InputChain;
+ NewEntry.InputFlag = InputFlag;
+ NewEntry.HasChainNodesMatched = !ChainNodesMatched.empty();
+ MatchScopes.push_back(NewEntry);
+ continue;
+ }
+ case OPC_RecordNode:
+ // Remember this node, it may end up being an operand in the pattern.
+ RecordedNodes.push_back(N);
+ continue;
+ case OPC_RecordMemRef:
+ MatchedMemRefs.push_back(cast<MemSDNode>(N)->getMemOperand());
+ continue;
+
+ case OPC_CaptureFlagInput:
+ // If the current node has an input flag, capture it in InputFlag.
+ if (N->getNumOperands() != 0 &&
+ N->getOperand(N->getNumOperands()-1).getValueType() == MVT::Flag)
+ InputFlag = N->getOperand(N->getNumOperands()-1);
+ continue;
+
+ case OPC_MoveChild: {
+ unsigned Child = MatcherTable[MatcherIndex++];
+ if (Child >= N.getNumOperands())
+ break; // Match fails if out of range child #.
+ N = N.getOperand(Child);
+ NodeStack.push_back(N);
+ continue;
+ }
+
+ case OPC_MoveParent:
+ // Pop the current node off the NodeStack.
+ NodeStack.pop_back();
+ assert(!NodeStack.empty() && "Node stack imbalance!");
+ N = NodeStack.back();
+ continue;
+
+ case OPC_CheckSame: {
+ // Accept if it is exactly the same as a previously recorded node.
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ if (N != RecordedNodes[RecNo]) break;
+ continue;
+ }
+ case OPC_CheckPatternPredicate:
+ if (!CheckPatternPredicate(MatcherTable[MatcherIndex++])) break;
+ continue;
+ case OPC_CheckPredicate:
+ if (!CheckNodePredicate(N.getNode(), MatcherTable[MatcherIndex++])) break;
+ continue;
+ case OPC_CheckComplexPat:
+ if (!CheckComplexPattern(NodeToMatch, N,
+ MatcherTable[MatcherIndex++], RecordedNodes))
+ break;
+ continue;
+ case OPC_CheckOpcode:
+ if (N->getOpcode() != MatcherTable[MatcherIndex++]) break;
+ continue;
+
+ case OPC_CheckMultiOpcode: {
+ unsigned NumOps = MatcherTable[MatcherIndex++];
+ bool OpcodeEquals = false;
+ for (unsigned i = 0; i != NumOps; ++i)
+ OpcodeEquals |= N->getOpcode() == MatcherTable[MatcherIndex++];
+ if (!OpcodeEquals) break;
+ continue;
+ }
+
+ case OPC_CheckType: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ if (N.getValueType() != VT) {
+ // Handle the case when VT is iPTR.
+ if (VT != MVT::iPTR || N.getValueType() != TLI.getPointerTy())
+ break;
+ }
+ continue;
+ }
+ case OPC_CheckCondCode:
+ if (cast<CondCodeSDNode>(N)->get() !=
+ (ISD::CondCode)MatcherTable[MatcherIndex++]) break;
+ continue;
+ case OPC_CheckValueType: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ if (cast<VTSDNode>(N)->getVT() != VT) {
+ // Handle the case when VT is iPTR.
+ if (VT != MVT::iPTR || cast<VTSDNode>(N)->getVT() != TLI.getPointerTy())
+ break;
+ }
+ continue;
+ }
+ case OPC_CheckInteger1:
+ if (CheckInteger(N, GetInt1(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckInteger2:
+ if (CheckInteger(N, GetInt2(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckInteger4:
+ if (CheckInteger(N, GetInt4(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckInteger8:
+ if (CheckInteger(N, GetInt8(MatcherTable, MatcherIndex))) break;
+ continue;
+
+ case OPC_CheckAndImm1:
+ if (CheckAndImmediate(N, GetInt1(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckAndImm2:
+ if (CheckAndImmediate(N, GetInt2(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckAndImm4:
+ if (CheckAndImmediate(N, GetInt4(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckAndImm8:
+ if (CheckAndImmediate(N, GetInt8(MatcherTable, MatcherIndex))) break;
+ continue;
+
+ case OPC_CheckOrImm1:
+ if (CheckOrImmediate(N, GetInt1(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckOrImm2:
+ if (CheckOrImmediate(N, GetInt2(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckOrImm4:
+ if (CheckOrImmediate(N, GetInt4(MatcherTable, MatcherIndex))) break;
+ continue;
+ case OPC_CheckOrImm8:
+ if (CheckOrImmediate(N, GetInt8(MatcherTable, MatcherIndex))) break;
+ continue;
+
+ case OPC_CheckFoldableChainNode: {
+ assert(NodeStack.size() != 1 && "No parent node");
+ // Verify that all intermediate nodes between the root and this one have
+ // a single use.
+ bool HasMultipleUses = false;
+ for (unsigned i = 1, e = NodeStack.size()-1; i != e; ++i)
+ if (!NodeStack[i].hasOneUse()) {
+ HasMultipleUses = true;
+ break;
+ }
+ if (HasMultipleUses) break;
+
+ // Check to see that the target thinks this is profitable to fold and that
+ // we can fold it without inducing cycles in the graph.
+ if (!IsProfitableToFold(N, NodeStack[NodeStack.size()-2].getNode(),
+ NodeToMatch) ||
+ !IsLegalToFold(N, NodeStack[NodeStack.size()-2].getNode(),
+ NodeToMatch))
+ break;
+
+ continue;
+ }
+ case OPC_CheckChainCompatible: {
+ unsigned PrevNode = MatcherTable[MatcherIndex++];
+ assert(PrevNode < RecordedNodes.size() && "Invalid CheckChainCompatible");
+ SDValue PrevChainedNode = RecordedNodes[PrevNode];
+ SDValue ThisChainedNode = RecordedNodes.back();
+
+ // We have two nodes with chains, verify that their input chains are good.
+ assert(PrevChainedNode.getOperand(0).getValueType() == MVT::Other &&
+ ThisChainedNode.getOperand(0).getValueType() == MVT::Other &&
+ "Invalid chained nodes");
+
+ if (!IsChainCompatible(// Input chain of the previous node.
+ PrevChainedNode.getOperand(0).getNode(),
+ // Node with chain.
+ ThisChainedNode.getNode()))
+ break;
+ continue;
+ }
+
+ case OPC_EmitInteger1: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ EmitInteger(GetInt1(MatcherTable, MatcherIndex), VT, RecordedNodes);
+ continue;
+ }
+ case OPC_EmitInteger2: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ EmitInteger(GetInt2(MatcherTable, MatcherIndex), VT, RecordedNodes);
+ continue;
+ }
+ case OPC_EmitInteger4: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ EmitInteger(GetInt4(MatcherTable, MatcherIndex), VT, RecordedNodes);
+ continue;
+ }
+ case OPC_EmitInteger8: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ EmitInteger(GetInt8(MatcherTable, MatcherIndex), VT, RecordedNodes);
+ continue;
+ }
+
+ case OPC_EmitRegister: {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ unsigned RegNo = MatcherTable[MatcherIndex++];
+ RecordedNodes.push_back(CurDAG->getRegister(RegNo, VT));
+ continue;
+ }
+
+ case OPC_EmitConvertToTarget: {
+ // Convert from IMM/FPIMM to target version.
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ SDValue Imm = RecordedNodes[RecNo];
+
+ if (Imm->getOpcode() == ISD::Constant) {
+ int64_t Val = cast<ConstantSDNode>(Imm)->getZExtValue();
+ Imm = CurDAG->getTargetConstant(Val, Imm.getValueType());
+ } else if (Imm->getOpcode() == ISD::ConstantFP) {
+ const ConstantFP *Val=cast<ConstantFPSDNode>(Imm)->getConstantFPValue();
+ Imm = CurDAG->getTargetConstantFP(*Val, Imm.getValueType());
+ }
+
+ RecordedNodes.push_back(Imm);
+ continue;
+ }
+
+ case OPC_EmitMergeInputChains: {
+ assert(InputChain.getNode() == 0 &&
+ "EmitMergeInputChains should be the first chain producing node");
+ // This node gets a list of nodes we matched in the input that have
+ // chains. We want to token factor all of the input chains to these nodes
+ // together. However, if any of the input chains is actually one of the
+ // nodes matched in this pattern, then we have an intra-match reference.
+ // Ignore these because the newly token factored chain should not refer to
+ // the old nodes.
+ unsigned NumChains = MatcherTable[MatcherIndex++];
+ assert(NumChains != 0 && "Can't TF zero chains");
+
+ // The common case here is that we have exactly one chain, which is really
+ // cheap to handle, just do it.
+ if (NumChains == 1) {
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ ChainNodesMatched.push_back(RecordedNodes[RecNo].getNode());
+ InputChain = RecordedNodes[RecNo].getOperand(0);
+ assert(InputChain.getValueType() == MVT::Other && "Not a chain");
+ continue;
+ }
+
+ // Read all of the chained nodes.
+ assert(ChainNodesMatched.empty() &&
+ "Should only have one EmitMergeInputChains per match");
+ for (unsigned i = 0; i != NumChains; ++i) {
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ ChainNodesMatched.push_back(RecordedNodes[RecNo].getNode());
+ }
+
+ // Walk all the chained nodes, adding the input chains if they are not in
+ // ChainedNodes (and this, not in the matched pattern). This is an N^2
+ // algorithm, but # chains is usually 2 here, at most 3 for MSP430.
+ SmallVector<SDValue, 3> InputChains;
+ for (unsigned i = 0, e = ChainNodesMatched.size(); i != e; ++i) {
+ SDValue InChain = ChainNodesMatched[i]->getOperand(0);
+ assert(InChain.getValueType() == MVT::Other && "Not a chain");
+ bool Invalid = false;
+ for (unsigned j = 0; j != e; ++j)
+ Invalid |= ChainNodesMatched[j] == InChain.getNode();
+ if (!Invalid)
+ InputChains.push_back(InChain);
+ }
+
+ SDValue Res;
+ if (InputChains.size() == 1)
+ InputChain = InputChains[0];
+ else
+ InputChain = CurDAG->getNode(ISD::TokenFactor,
+ NodeToMatch->getDebugLoc(), MVT::Other,
+ &InputChains[0], InputChains.size());
+ continue;
+ }
+
+ case OPC_EmitCopyToReg: {
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ unsigned DestPhysReg = MatcherTable[MatcherIndex++];
+
+ if (InputChain.getNode() == 0)
+ InputChain = CurDAG->getEntryNode();
+
+ InputChain = CurDAG->getCopyToReg(InputChain, NodeToMatch->getDebugLoc(),
+ DestPhysReg, RecordedNodes[RecNo],
+ InputFlag);
+
+ InputFlag = InputChain.getValue(1);
+ continue;
+ }
+
+ case OPC_EmitNodeXForm: {
+ unsigned XFormNo = MatcherTable[MatcherIndex++];
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ RecordedNodes.push_back(RunSDNodeXForm(RecordedNodes[RecNo], XFormNo));
+ continue;
+ }
+
+ case OPC_EmitNode: {
+ uint16_t TargetOpc = GetInt2(MatcherTable, MatcherIndex);
+ unsigned EmitNodeInfo = MatcherTable[MatcherIndex++];
+ // Get the result VT list.
+ unsigned NumVTs = MatcherTable[MatcherIndex++];
+ assert(NumVTs != 0 && "Invalid node result");
+ SmallVector<EVT, 4> VTs;
+ for (unsigned i = 0; i != NumVTs; ++i) {
+ MVT::SimpleValueType VT =
+ (MVT::SimpleValueType)MatcherTable[MatcherIndex++];
+ if (VT == MVT::iPTR) VT = TLI.getPointerTy().SimpleTy;
+ VTs.push_back(VT);
+ }
+
+ // FIXME: Use faster version for the common 'one VT' case?
+ SDVTList VTList = CurDAG->getVTList(VTs.data(), VTs.size());
+
+ // Get the operand list.
+ unsigned NumOps = MatcherTable[MatcherIndex++];
+ SmallVector<SDValue, 8> Ops;
+ for (unsigned i = 0; i != NumOps; ++i) {
+ unsigned RecNo = MatcherTable[MatcherIndex++];
+ if (RecNo & 128)
+ RecNo = GetVBR(RecNo, MatcherTable, MatcherIndex);
+
+ assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
+ Ops.push_back(RecordedNodes[RecNo]);
+ }
+
+ // If there are variadic operands to add, handle them now.
+ if (EmitNodeInfo & OPFL_VariadicInfo) {
+ // Determine the start index to copy from.
+ unsigned FirstOpToCopy = getNumFixedFromVariadicInfo(EmitNodeInfo);
+ FirstOpToCopy += (EmitNodeInfo & OPFL_Chain) ? 1 : 0;
+ assert(NodeToMatch->getNumOperands() >= FirstOpToCopy &&
+ "Invalid variadic node");
+ // Copy all of the variadic operands, not including a potential flag
+ // input.
+ for (unsigned i = FirstOpToCopy, e = NodeToMatch->getNumOperands();
+ i != e; ++i) {
+ SDValue V = NodeToMatch->getOperand(i);
+ if (V.getValueType() == MVT::Flag) break;
+ Ops.push_back(V);
+ }
+ }
+
+ // If this has chain/flag inputs, add them.
+ if (EmitNodeInfo & OPFL_Chain)
+ Ops.push_back(InputChain);
+ if ((EmitNodeInfo & OPFL_Flag) && InputFlag.getNode() != 0)
+ Ops.push_back(InputFlag);
+
+ // Create the node.
+ MachineSDNode *Res = CurDAG->getMachineNode(TargetOpc,
+ NodeToMatch->getDebugLoc(),
+ VTList,
+ Ops.data(), Ops.size());
+ // Add all the non-flag/non-chain results to the RecordedNodes list.
+ for (unsigned i = 0, e = VTs.size(); i != e; ++i) {
+ if (VTs[i] == MVT::Other || VTs[i] == MVT::Flag) break;
+ RecordedNodes.push_back(SDValue(Res, i));
+ }
+
+ // If the node had chain/flag results, update our notion of the current
+ // chain and flag.
+ if (VTs.back() == MVT::Flag) {
+ InputFlag = SDValue(Res, VTs.size()-1);
+ if (EmitNodeInfo & OPFL_Chain)
+ InputChain = SDValue(Res, VTs.size()-2);
+ } else if (EmitNodeInfo & OPFL_Chain)
+ InputChain = SDValue(Res, VTs.size()-1);
+
+ // If the OPFL_MemRefs flag is set on this node, slap all of the
+ // accumulated memrefs onto it.
+ //
+ // FIXME: This is vastly incorrect for patterns with multiple outputs
+ // instructions that access memory and for ComplexPatterns that match
+ // loads.
+ if (EmitNodeInfo & OPFL_MemRefs) {
+ MachineSDNode::mmo_iterator MemRefs =
+ MF->allocateMemRefsArray(MatchedMemRefs.size());
+ std::copy(MatchedMemRefs.begin(), MatchedMemRefs.end(), MemRefs);
+ Res->setMemRefs(MemRefs, MemRefs + MatchedMemRefs.size());
+ }
+
+ DEBUG(errs() << " Created node: "; Res->dump(CurDAG); errs() << "\n");
+ continue;
+ }
+
+ case OPC_CompleteMatch: {
+ // The match has been completed, and any new nodes (if any) have been
+ // created. Patch up references to the matched dag to use the newly
+ // created nodes.
+ unsigned NumResults = MatcherTable[MatcherIndex++];
+
+ for (unsigned i = 0; i != NumResults; ++i) {
+ unsigned ResSlot = MatcherTable[MatcherIndex++];
+ if (ResSlot & 128)
+ ResSlot = GetVBR(ResSlot, MatcherTable, MatcherIndex);
+
+ assert(ResSlot < RecordedNodes.size() && "Invalid CheckSame");
+ SDValue Res = RecordedNodes[ResSlot];
+
+ // FIXME2: Eliminate this horrible hack by fixing the 'Gen' program
+ // after (parallel) on input patterns are removed. This would also
+ // allow us to stop encoding #results in OPC_CompleteMatch's table
+ // entry.
+ if (NodeToMatch->getNumValues() <= i ||
+ NodeToMatch->getValueType(i) == MVT::Other ||
+ NodeToMatch->getValueType(i) == MVT::Flag)
+ break;
+ assert((NodeToMatch->getValueType(i) == Res.getValueType() ||
+ NodeToMatch->getValueType(i) == MVT::iPTR ||
+ Res.getValueType() == MVT::iPTR ||
+ NodeToMatch->getValueType(i).getSizeInBits() ==
+ Res.getValueType().getSizeInBits()) &&
+ "invalid replacement");
+ ReplaceUses(SDValue(NodeToMatch, i), Res);
+ }
+
+ // Now that all the normal results are replaced, we replace the chain and
+ // flag results if present.
+ if (!ChainNodesMatched.empty()) {
+ assert(InputChain.getNode() != 0 &&
+ "Matched input chains but didn't produce a chain");
+ // Loop over all of the nodes we matched that produced a chain result.
+ // Replace all the chain results with the final chain we ended up with.
+ for (unsigned i = 0, e = ChainNodesMatched.size(); i != e; ++i) {
+ SDNode *ChainNode = ChainNodesMatched[i];
+ SDValue ChainVal = SDValue(ChainNode, ChainNode->getNumValues()-1);
+ if (ChainVal.getValueType() == MVT::Flag)
+ ChainVal = ChainVal.getValue(ChainVal->getNumValues()-2);
+ assert(ChainVal.getValueType() == MVT::Other && "Not a chain?");
+ ReplaceUses(ChainVal, InputChain);
+ }
+ }
+ // If the root node produces a flag, make sure to replace its flag
+ // result with the resultant flag.
+ if (NodeToMatch->getValueType(NodeToMatch->getNumValues()-1) ==
+ MVT::Flag)
+ ReplaceUses(SDValue(NodeToMatch, NodeToMatch->getNumValues()-1),
+ InputFlag);
+
+ assert(NodeToMatch->use_empty() &&
+ "Didn't replace all uses of the node?");
+
+ DEBUG(errs() << "ISEL: Match complete!\n");
+
+ // FIXME: We just return here, which interacts correctly with SelectRoot
+ // above. We should fix this to not return an SDNode* anymore.
+ return 0;
+ }
+ }
+
+ // If the code reached this point, then the match failed pop out to the next
+ // match scope.
+ if (MatchScopes.empty()) {
+ CannotYetSelect(NodeToMatch);
+ return 0;
+ }
+
+ const MatchScope &LastScope = MatchScopes.back();
+ RecordedNodes.resize(LastScope.NumRecordedNodes);
+ NodeStack.resize(LastScope.NodeStackSize);
+ N = NodeStack.back();
+
+ DEBUG(errs() << " Match failed at index " << MatcherIndex
+ << " continuing at " << LastScope.FailIndex << "\n");
+
+ if (LastScope.NumMatchedMemRefs != MatchedMemRefs.size())
+ MatchedMemRefs.resize(LastScope.NumMatchedMemRefs);
+ MatcherIndex = LastScope.FailIndex;
+
+ InputChain = LastScope.InputChain;
+ InputFlag = LastScope.InputFlag;
+ if (!LastScope.HasChainNodesMatched)
+ ChainNodesMatched.clear();
+
+ MatchScopes.pop_back();
+ }
+}
+
+
#endif /* LLVM_CODEGEN_DAGISEL_HEADER_H */
projects / oota-llvm.git / blobdiff