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60df53e30a
llvm-6502/include/llvm/CodeGen/DAGISelHeader.h
Chris Lattner 60df53e30a rename PushMatcherNode -> ScopeMatcherNode to more accurately 
reflect what it does.  Switch the sense of the Next and the Check
arms to be more logical.  No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97093 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 01:56:48 +00:00

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//==-llvm/CodeGen/DAGISelHeader.h - Common DAG ISel definitions -*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides definitions of the common, target-independent methods and
// data, which is used by SelectionDAG-based instruction selectors.
//
// *** NOTE: This file is #included into the middle of the target
// instruction selector class. These functions are really methods.
// This is a little awkward, but it allows this code to be shared
// by all the targets while still being able to call into
// target-specific code without using a virtual function call.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_DAGISEL_HEADER_H
#define LLVM_CODEGEN_DAGISEL_HEADER_H
/// ISelPosition - Node iterator marking the current position of
/// instruction selection as it procedes through the topologically-sorted
/// node list.
SelectionDAG::allnodes_iterator ISelPosition;
/// ChainNotReachable - Returns true if Chain does not reach Op.
static bool ChainNotReachable(SDNode *Chain, SDNode *Op) {
if (Chain->getOpcode() == ISD::EntryToken)
return true;
if (Chain->getOpcode() == ISD::TokenFactor)
return false;
if (Chain->getNumOperands() > 0) {
SDValue C0 = Chain->getOperand(0);
if (C0.getValueType() == MVT::Other)
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 {
SelectionDAG::allnodes_iterator &ISelPosition;
public:
explicit ISelUpdater(SelectionDAG::allnodes_iterator &isp)
: ISelPosition(isp) {}
/// NodeDeleted - Handle nodes deleted from the graph. If the
/// node being deleted is the current ISelPosition node, update
/// ISelPosition.
///
virtual void NodeDeleted(SDNode *N, SDNode *E) {
if (ISelPosition == SelectionDAG::allnodes_iterator(N))
++ISelPosition;
}
/// NodeUpdated - Ignore updates for now.
virtual void NodeUpdated(SDNode *N) {}
};
/// ReplaceUses - replace all uses of the old node F with the use
/// of the new node T.
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.
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.
DISABLE_INLINE void ReplaceUses(SDNode *F, SDNode *T) {
ISelUpdater ISU(ISelPosition);
CurDAG->ReplaceAllUsesWith(F, T, &ISU);
}
/// SelectRoot - Top level entry to DAG instruction selector.
/// Selects instructions starting at the root of the current DAG.
void SelectRoot(SelectionDAG &DAG) {
SelectRootInit();
// Create a dummy node (which is not added to allnodes), that adds
// a reference to the root node, preventing it from being deleted,
// and tracking any changes of the root.
HandleSDNode Dummy(CurDAG->getRoot());
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
// graph) and preceding back toward the beginning (the entry
// node).
while (ISelPosition != CurDAG->allnodes_begin()) {
SDNode *Node = --ISelPosition;
// Skip dead nodes. DAGCombiner is expected to eliminate all dead nodes,
// but there are currently some corner cases that it misses. Also, this
// makes it theoretically possible to disable the DAGCombiner.
if (Node->use_empty())
continue;
SDNode *ResNode = Select(Node);
// If node should not be replaced, continue with the next one.
if (ResNode == Node)
continue;
// Replace node.
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.
ISelUpdater ISU(ISelPosition);
CurDAG->RemoveDeadNode(Node, &ISU);
}
}
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_Scope, OPC_Scope2,
OPC_RecordNode,
OPC_RecordChild0, OPC_RecordChild1, OPC_RecordChild2, OPC_RecordChild3,
OPC_RecordChild4, OPC_RecordChild5, OPC_RecordChild6, OPC_RecordChild7,
OPC_RecordMemRef,
OPC_CaptureFlagInput,
OPC_MoveChild,
OPC_MoveParent,
OPC_CheckSame,
OPC_CheckPatternPredicate,
OPC_CheckPredicate,
OPC_CheckOpcode,
OPC_CheckMultiOpcode,
OPC_CheckType,
OPC_CheckChild0Type, OPC_CheckChild1Type, OPC_CheckChild2Type,
OPC_CheckChild3Type, OPC_CheckChild4Type, OPC_CheckChild5Type,
OPC_CheckChild6Type, OPC_CheckChild7Type,
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_MarkFlagResults,
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, HasFlagResultNodesMatched;
};
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;
SmallVector<SDNode*, 3> FlagResultNodesMatched;
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");
BuiltinOpcodes Opcode = (BuiltinOpcodes)MatcherTable[MatcherIndex++];
switch (Opcode) {
case OPC_Scope: {
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();
NewEntry.HasFlagResultNodesMatched = !FlagResultNodesMatched.empty();
MatchScopes.push_back(NewEntry);
continue;
}
case OPC_Scope2: {
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();
NewEntry.HasFlagResultNodesMatched = !FlagResultNodesMatched.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_RecordChild0: case OPC_RecordChild1:
case OPC_RecordChild2: case OPC_RecordChild3:
case OPC_RecordChild4: case OPC_RecordChild5:
case OPC_RecordChild6: case OPC_RecordChild7: {
unsigned ChildNo = Opcode-OPC_RecordChild0;
if (ChildNo >= N.getNumOperands())
break; // Match fails if out of range child #.
RecordedNodes.push_back(N->getOperand(ChildNo));
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 ChildNo = MatcherTable[MatcherIndex++];
if (ChildNo >= N.getNumOperands())
break; // Match fails if out of range child #.
N = N.getOperand(ChildNo);
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_CheckChild0Type: case OPC_CheckChild1Type:
case OPC_CheckChild2Type: case OPC_CheckChild3Type:
case OPC_CheckChild4Type: case OPC_CheckChild5Type:
case OPC_CheckChild6Type: case OPC_CheckChild7Type: {
unsigned ChildNo = Opcode-OPC_CheckChild0Type;
if (ChildNo >= N.getNumOperands())
break; // Match fails if out of range child #.
MVT::SimpleValueType VT =
(MVT::SimpleValueType)MatcherTable[MatcherIndex++];
EVT ChildVT = N.getOperand(ChildNo).getValueType();
if (ChildVT != VT) {
// Handle the case when VT is iPTR.
if (VT != MVT::iPTR || ChildVT != 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");
assert(ChainNodesMatched.empty() &&
"Should only have one EmitMergeInputChains per match");
// Handle the first chain.
unsigned RecNo = MatcherTable[MatcherIndex++];
assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
ChainNodesMatched.push_back(RecordedNodes[RecNo].getNode());
// If the chained node is not the root, we can't fold it if it has
// multiple uses.
// FIXME: What if other value results of the node have uses not matched by
// this pattern?
if (ChainNodesMatched.back() != NodeToMatch &&
!RecordedNodes[RecNo].hasOneUse()) {
ChainNodesMatched.clear();
break;
}
// The common case here is that we have exactly one chain, which is really
// cheap to handle, just do it.
if (NumChains == 1) {
InputChain = RecordedNodes[RecNo].getOperand(0);
assert(InputChain.getValueType() == MVT::Other && "Not a chain");
continue;
}
// Read all of the chained nodes.
for (unsigned i = 1; i != NumChains; ++i) {
RecNo = MatcherTable[MatcherIndex++];
assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
ChainNodesMatched.push_back(RecordedNodes[RecNo].getNode());
// FIXME: What if other value results of the node have uses not matched by
// this pattern?
if (ChainNodesMatched.back() != NodeToMatch &&
!RecordedNodes[RecNo].hasOneUse()) {
ChainNodesMatched.clear();
break;
}
}
// 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 EmitNode");
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_MarkFlagResults: {
unsigned NumNodes = MatcherTable[MatcherIndex++];
// Read and remember all the flag-result nodes.
for (unsigned i = 0; i != NumNodes; ++i) {
unsigned RecNo = MatcherTable[MatcherIndex++];
if (RecNo & 128)
RecNo = GetVBR(RecNo, MatcherTable, MatcherIndex);
assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
FlagResultNodesMatched.push_back(RecordedNodes[RecNo].getNode());
}
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 result produces a flag, update any flag results in the matched
// pattern with the flag result.
if (InputFlag.getNode() != 0) {
// Handle the root node:
if (NodeToMatch->getValueType(NodeToMatch->getNumValues()-1) ==
MVT::Flag)
ReplaceUses(SDValue(NodeToMatch, NodeToMatch->getNumValues()-1),
InputFlag);
// Handle any interior nodes explicitly marked.
for (unsigned i = 0, e = FlagResultNodesMatched.size(); i != e; ++i) {
SDNode *FRN = FlagResultNodesMatched[i];
assert(FRN->getValueType(FRN->getNumValues()-1) == MVT::Flag &&
"Doesn't have a flag result");
ReplaceUses(SDValue(FRN, FRN->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();
if (!LastScope.HasFlagResultNodesMatched)
FlagResultNodesMatched.clear();
MatchScopes.pop_back();
}
}
#endif /* LLVM_CODEGEN_DAGISEL_HEADER_H */
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