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llvm-6502/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
Duncan Sands 4a544a79bd Split the init.trampoline intrinsic, which currently combines GCC's 
init.trampoline and adjust.trampoline intrinsics, into two intrinsics
like in GCC.  While having one combined intrinsic is tempting, it is
not natural because typically the trampoline initialization needs to
be done in one function, and the result of adjust trampoline is needed
in a different (nested) function.  To get around this llvm-gcc hacks the
nested function lowering code to insert an additional parent variable
holding the adjust.trampoline result that can be accessed from the child
function.  Dragonegg doesn't have the luxury of tweaking GCC code, so it
stored the result of adjust.trampoline in the memory GCC set aside for
the trampoline itself (this is always available in the child function),
and set up some new memory (using an alloca) to hold the trampoline.
Unfortunately this breaks Go which allocates trampoline memory on the
heap and wants to use it even after the parent has exited (!).  Rather
than doing even more hacks to get Go working, it seemed best to just use
two intrinsics like in GCC.  Patch mostly by Sanjoy Das.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139140 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-06 13:37:06 +00:00

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//===-- LegalizeDAG.cpp - Implement SelectionDAG::Legalize ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SelectionDAG::Legalize method.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/LLVMContext.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
/// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
/// hacks on it until the target machine can handle it. This involves
/// eliminating value sizes the machine cannot handle (promoting small sizes to
/// large sizes or splitting up large values into small values) as well as
/// eliminating operations the machine cannot handle.
///
/// This code also does a small amount of optimization and recognition of idioms
/// as part of its processing. For example, if a target does not support a
/// 'setcc' instruction efficiently, but does support 'brcc' instruction, this
/// will attempt merge setcc and brc instructions into brcc's.
///
namespace {
class SelectionDAGLegalize {
const TargetMachine &TM;
const TargetLowering &TLI;
SelectionDAG &DAG;
// Libcall insertion helpers.
/// LastCALLSEQ_END - This keeps track of the CALLSEQ_END node that has been
/// legalized. We use this to ensure that calls are properly serialized
/// against each other, including inserted libcalls.
SDValue LastCALLSEQ_END;
/// IsLegalizingCall - This member is used *only* for purposes of providing
/// helpful assertions that a libcall isn't created while another call is
/// being legalized (which could lead to non-serialized call sequences).
bool IsLegalizingCall;
/// LegalizedNodes - For nodes that are of legal width, and that have more
/// than one use, this map indicates what regularized operand to use. This
/// allows us to avoid legalizing the same thing more than once.
DenseMap<SDValue, SDValue> LegalizedNodes;
void AddLegalizedOperand(SDValue From, SDValue To) {
LegalizedNodes.insert(std::make_pair(From, To));
// If someone requests legalization of the new node, return itself.
if (From != To)
LegalizedNodes.insert(std::make_pair(To, To));
// Transfer SDDbgValues.
DAG.TransferDbgValues(From, To);
}
public:
explicit SelectionDAGLegalize(SelectionDAG &DAG);
void LegalizeDAG();
private:
/// LegalizeOp - Return a legal replacement for the given operation, with
/// all legal operands.
SDValue LegalizeOp(SDValue O);
SDValue OptimizeFloatStore(StoreSDNode *ST);
/// PerformInsertVectorEltInMemory - Some target cannot handle a variable
/// insertion index for the INSERT_VECTOR_ELT instruction. In this case, it
/// is necessary to spill the vector being inserted into to memory, perform
/// the insert there, and then read the result back.
SDValue PerformInsertVectorEltInMemory(SDValue Vec, SDValue Val,
SDValue Idx, DebugLoc dl);
SDValue ExpandINSERT_VECTOR_ELT(SDValue Vec, SDValue Val,
SDValue Idx, DebugLoc dl);
/// ShuffleWithNarrowerEltType - Return a vector shuffle operation which
/// performs the same shuffe in terms of order or result bytes, but on a type
/// whose vector element type is narrower than the original shuffle type.
/// e.g. <v4i32> <0, 1, 0, 1> -> v8i16 <0, 1, 2, 3, 0, 1, 2, 3>
SDValue ShuffleWithNarrowerEltType(EVT NVT, EVT VT, DebugLoc dl,
SDValue N1, SDValue N2,
SmallVectorImpl<int> &Mask) const;
bool LegalizeAllNodesNotLeadingTo(SDNode *N, SDNode *Dest,
SmallPtrSet<SDNode*, 32> &NodesLeadingTo);
void LegalizeSetCCCondCode(EVT VT, SDValue &LHS, SDValue &RHS, SDValue &CC,
DebugLoc dl);
SDValue ExpandLibCall(RTLIB::Libcall LC, SDNode *Node, bool isSigned);
SDValue ExpandLibCall(RTLIB::Libcall LC, EVT RetVT, const SDValue *Ops,
unsigned NumOps, bool isSigned, DebugLoc dl);
std::pair<SDValue, SDValue> ExpandChainLibCall(RTLIB::Libcall LC,
SDNode *Node, bool isSigned);
SDValue ExpandFPLibCall(SDNode *Node, RTLIB::Libcall Call_F32,
RTLIB::Libcall Call_F64, RTLIB::Libcall Call_F80,
RTLIB::Libcall Call_PPCF128);
SDValue ExpandIntLibCall(SDNode *Node, bool isSigned,
RTLIB::Libcall Call_I8,
RTLIB::Libcall Call_I16,
RTLIB::Libcall Call_I32,
RTLIB::Libcall Call_I64,
RTLIB::Libcall Call_I128);
void ExpandDivRemLibCall(SDNode *Node, SmallVectorImpl<SDValue> &Results);
SDValue EmitStackConvert(SDValue SrcOp, EVT SlotVT, EVT DestVT, DebugLoc dl);
SDValue ExpandBUILD_VECTOR(SDNode *Node);
SDValue ExpandSCALAR_TO_VECTOR(SDNode *Node);
void ExpandDYNAMIC_STACKALLOC(SDNode *Node,
SmallVectorImpl<SDValue> &Results);
SDValue ExpandFCOPYSIGN(SDNode *Node);
SDValue ExpandLegalINT_TO_FP(bool isSigned, SDValue LegalOp, EVT DestVT,
DebugLoc dl);
SDValue PromoteLegalINT_TO_FP(SDValue LegalOp, EVT DestVT, bool isSigned,
DebugLoc dl);
SDValue PromoteLegalFP_TO_INT(SDValue LegalOp, EVT DestVT, bool isSigned,
DebugLoc dl);
SDValue ExpandBSWAP(SDValue Op, DebugLoc dl);
SDValue ExpandBitCount(unsigned Opc, SDValue Op, DebugLoc dl);
SDValue ExpandExtractFromVectorThroughStack(SDValue Op);
SDValue ExpandInsertToVectorThroughStack(SDValue Op);
SDValue ExpandVectorBuildThroughStack(SDNode* Node);
std::pair<SDValue, SDValue> ExpandAtomic(SDNode *Node);
void ExpandNode(SDNode *Node, SmallVectorImpl<SDValue> &Results);
void PromoteNode(SDNode *Node, SmallVectorImpl<SDValue> &Results);
};
}
/// ShuffleWithNarrowerEltType - Return a vector shuffle operation which
/// performs the same shuffe in terms of order or result bytes, but on a type
/// whose vector element type is narrower than the original shuffle type.
/// e.g. <v4i32> <0, 1, 0, 1> -> v8i16 <0, 1, 2, 3, 0, 1, 2, 3>
SDValue
SelectionDAGLegalize::ShuffleWithNarrowerEltType(EVT NVT, EVT VT, DebugLoc dl,
SDValue N1, SDValue N2,
SmallVectorImpl<int> &Mask) const {
unsigned NumMaskElts = VT.getVectorNumElements();
unsigned NumDestElts = NVT.getVectorNumElements();
unsigned NumEltsGrowth = NumDestElts / NumMaskElts;
assert(NumEltsGrowth && "Cannot promote to vector type with fewer elts!");
if (NumEltsGrowth == 1)
return DAG.getVectorShuffle(NVT, dl, N1, N2, &Mask[0]);
SmallVector<int, 8> NewMask;
for (unsigned i = 0; i != NumMaskElts; ++i) {
int Idx = Mask[i];
for (unsigned j = 0; j != NumEltsGrowth; ++j) {
if (Idx < 0)
NewMask.push_back(-1);
else
NewMask.push_back(Idx * NumEltsGrowth + j);
}
}
assert(NewMask.size() == NumDestElts && "Non-integer NumEltsGrowth?");
assert(TLI.isShuffleMaskLegal(NewMask, NVT) && "Shuffle not legal?");
return DAG.getVectorShuffle(NVT, dl, N1, N2, &NewMask[0]);
}
SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag)
: TM(dag.getTarget()), TLI(dag.getTargetLoweringInfo()),
DAG(dag) {
}
void SelectionDAGLegalize::LegalizeDAG() {
LastCALLSEQ_END = DAG.getEntryNode();
IsLegalizingCall = false;
// The legalize process is inherently a bottom-up recursive process (users
// legalize their uses before themselves). Given infinite stack space, we
// could just start legalizing on the root and traverse the whole graph. In
// practice however, this causes us to run out of stack space on large basic
// blocks. To avoid this problem, compute an ordering of the nodes where each
// node is only legalized after all of its operands are legalized.
DAG.AssignTopologicalOrder();
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
E = prior(DAG.allnodes_end()); I != llvm::next(E); ++I)
LegalizeOp(SDValue(I, 0));
// Finally, it's possible the root changed. Get the new root.
SDValue OldRoot = DAG.getRoot();
assert(LegalizedNodes.count(OldRoot) && "Root didn't get legalized?");
DAG.setRoot(LegalizedNodes[OldRoot]);
LegalizedNodes.clear();
// Remove dead nodes now.
DAG.RemoveDeadNodes();
}
/// FindCallEndFromCallStart - Given a chained node that is part of a call
/// sequence, find the CALLSEQ_END node that terminates the call sequence.
static SDNode *FindCallEndFromCallStart(SDNode *Node, int depth = 0) {
// Nested CALLSEQ_START/END constructs aren't yet legal,
// but we can DTRT and handle them correctly here.
if (Node->getOpcode() == ISD::CALLSEQ_START)
depth++;
else if (Node->getOpcode() == ISD::CALLSEQ_END) {
depth--;
if (depth == 0)
return Node;
}
if (Node->use_empty())
return 0; // No CallSeqEnd
// The chain is usually at the end.
SDValue TheChain(Node, Node->getNumValues()-1);
if (TheChain.getValueType() != MVT::Other) {
// Sometimes it's at the beginning.
TheChain = SDValue(Node, 0);
if (TheChain.getValueType() != MVT::Other) {
// Otherwise, hunt for it.
for (unsigned i = 1, e = Node->getNumValues(); i != e; ++i)
if (Node->getValueType(i) == MVT::Other) {
TheChain = SDValue(Node, i);
break;
}
// Otherwise, we walked into a node without a chain.
if (TheChain.getValueType() != MVT::Other)
return 0;
}
}
for (SDNode::use_iterator UI = Node->use_begin(),
E = Node->use_end(); UI != E; ++UI) {
// Make sure to only follow users of our token chain.
SDNode *User = *UI;
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i)
if (User->getOperand(i) == TheChain)
if (SDNode *Result = FindCallEndFromCallStart(User, depth))
return Result;
}
return 0;
}
/// FindCallStartFromCallEnd - Given a chained node that is part of a call
/// sequence, find the CALLSEQ_START node that initiates the call sequence.
static SDNode *FindCallStartFromCallEnd(SDNode *Node) {
int nested = 0;
assert(Node && "Didn't find callseq_start for a call??");
while (Node->getOpcode() != ISD::CALLSEQ_START || nested) {
Node = Node->getOperand(0).getNode();
assert(Node->getOperand(0).getValueType() == MVT::Other &&
"Node doesn't have a token chain argument!");
switch (Node->getOpcode()) {
default:
break;
case ISD::CALLSEQ_START:
if (!nested)
return Node;
nested--;
break;
case ISD::CALLSEQ_END:
nested++;
break;
}
}
return 0;
}
/// LegalizeAllNodesNotLeadingTo - Recursively walk the uses of N, looking to
/// see if any uses can reach Dest. If no dest operands can get to dest,
/// legalize them, legalize ourself, and return false, otherwise, return true.
///
/// Keep track of the nodes we fine that actually do lead to Dest in
/// NodesLeadingTo. This avoids retraversing them exponential number of times.
///
bool SelectionDAGLegalize::LegalizeAllNodesNotLeadingTo(SDNode *N, SDNode *Dest,
SmallPtrSet<SDNode*, 32> &NodesLeadingTo) {
if (N == Dest) return true; // N certainly leads to Dest :)
// If we've already processed this node and it does lead to Dest, there is no
// need to reprocess it.
if (NodesLeadingTo.count(N)) return true;
// If the first result of this node has been already legalized, then it cannot
// reach N.
if (LegalizedNodes.count(SDValue(N, 0))) return false;
// Okay, this node has not already been legalized. Check and legalize all
// operands. If none lead to Dest, then we can legalize this node.
bool OperandsLeadToDest = false;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
OperandsLeadToDest |= // If an operand leads to Dest, so do we.
LegalizeAllNodesNotLeadingTo(N->getOperand(i).getNode(), Dest,
NodesLeadingTo);
if (OperandsLeadToDest) {
NodesLeadingTo.insert(N);
return true;
}
// Okay, this node looks safe, legalize it and return false.
LegalizeOp(SDValue(N, 0));
return false;
}
/// ExpandConstantFP - Expands the ConstantFP node to an integer constant or
/// a load from the constant pool.
static SDValue ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP,
SelectionDAG &DAG, const TargetLowering &TLI) {
bool Extend = false;
DebugLoc dl = CFP->getDebugLoc();
// If a FP immediate is precise when represented as a float and if the
// target can do an extending load from float to double, we put it into
// the constant pool as a float, even if it's is statically typed as a
// double. This shrinks FP constants and canonicalizes them for targets where
// an FP extending load is the same cost as a normal load (such as on the x87
// fp stack or PPC FP unit).
EVT VT = CFP->getValueType(0);
ConstantFP *LLVMC = const_cast<ConstantFP*>(CFP->getConstantFPValue());
if (!UseCP) {
assert((VT == MVT::f64 || VT == MVT::f32) && "Invalid type expansion");
return DAG.getConstant(LLVMC->getValueAPF().bitcastToAPInt(),
(VT == MVT::f64) ? MVT::i64 : MVT::i32);
}
EVT OrigVT = VT;
EVT SVT = VT;
while (SVT != MVT::f32) {
SVT = (MVT::SimpleValueType)(SVT.getSimpleVT().SimpleTy - 1);
if (ConstantFPSDNode::isValueValidForType(SVT, CFP->getValueAPF()) &&
// Only do this if the target has a native EXTLOAD instruction from
// smaller type.
TLI.isLoadExtLegal(ISD::EXTLOAD, SVT) &&
TLI.ShouldShrinkFPConstant(OrigVT)) {
Type *SType = SVT.getTypeForEVT(*DAG.getContext());
LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC, SType));
VT = SVT;
Extend = true;
}
}
SDValue CPIdx = DAG.getConstantPool(LLVMC, TLI.getPointerTy());
unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
if (Extend)
return DAG.getExtLoad(ISD::EXTLOAD, dl, OrigVT,
DAG.getEntryNode(),
CPIdx, MachinePointerInfo::getConstantPool(),
VT, false, false, Alignment);
return DAG.getLoad(OrigVT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(), false, false,
Alignment);
}
/// ExpandUnalignedStore - Expands an unaligned store to 2 half-size stores.
static
SDValue ExpandUnalignedStore(StoreSDNode *ST, SelectionDAG &DAG,
const TargetLowering &TLI) {
SDValue Chain = ST->getChain();
SDValue Ptr = ST->getBasePtr();
SDValue Val = ST->getValue();
EVT VT = Val.getValueType();
int Alignment = ST->getAlignment();
DebugLoc dl = ST->getDebugLoc();
if (ST->getMemoryVT().isFloatingPoint() ||
ST->getMemoryVT().isVector()) {
EVT intVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits());
if (TLI.isTypeLegal(intVT)) {
// Expand to a bitconvert of the value to the integer type of the
// same size, then a (misaligned) int store.
// FIXME: Does not handle truncating floating point stores!
SDValue Result = DAG.getNode(ISD::BITCAST, dl, intVT, Val);
return DAG.getStore(Chain, dl, Result, Ptr, ST->getPointerInfo(),
ST->isVolatile(), ST->isNonTemporal(), Alignment);
}
// Do a (aligned) store to a stack slot, then copy from the stack slot
// to the final destination using (unaligned) integer loads and stores.
EVT StoredVT = ST->getMemoryVT();
EVT RegVT =
TLI.getRegisterType(*DAG.getContext(),
EVT::getIntegerVT(*DAG.getContext(),
StoredVT.getSizeInBits()));
unsigned StoredBytes = StoredVT.getSizeInBits() / 8;
unsigned RegBytes = RegVT.getSizeInBits() / 8;
unsigned NumRegs = (StoredBytes + RegBytes - 1) / RegBytes;
// Make sure the stack slot is also aligned for the register type.
SDValue StackPtr = DAG.CreateStackTemporary(StoredVT, RegVT);
// Perform the original store, only redirected to the stack slot.
SDValue Store = DAG.getTruncStore(Chain, dl,
Val, StackPtr, MachinePointerInfo(),
StoredVT, false, false, 0);
SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
SmallVector<SDValue, 8> Stores;
unsigned Offset = 0;
// Do all but one copies using the full register width.
for (unsigned i = 1; i < NumRegs; i++) {
// Load one integer register's worth from the stack slot.
SDValue Load = DAG.getLoad(RegVT, dl, Store, StackPtr,
MachinePointerInfo(),
false, false, 0);
// Store it to the final location. Remember the store.
Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo().getWithOffset(Offset),
ST->isVolatile(), ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// Increment the pointers.
Offset += RegBytes;
StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
Increment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
}
// The last store may be partial. Do a truncating store. On big-endian
// machines this requires an extending load from the stack slot to ensure
// that the bits are in the right place.
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
8 * (StoredBytes - Offset));
// Load from the stack slot.
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Store, StackPtr,
MachinePointerInfo(),
MemVT, false, false, 0);
Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo()
.getWithOffset(Offset),
MemVT, ST->isVolatile(),
ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// The order of the stores doesn't matter - say it with a TokenFactor.
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
Stores.size());
}
assert(ST->getMemoryVT().isInteger() &&
!ST->getMemoryVT().isVector() &&
"Unaligned store of unknown type.");
// Get the half-size VT
EVT NewStoredVT = ST->getMemoryVT().getHalfSizedIntegerVT(*DAG.getContext());
int NumBits = NewStoredVT.getSizeInBits();
int IncrementSize = NumBits / 8;
// Divide the stored value in two parts.
SDValue ShiftAmount = DAG.getConstant(NumBits,
TLI.getShiftAmountTy(Val.getValueType()));
SDValue Lo = Val;
SDValue Hi = DAG.getNode(ISD::SRL, dl, VT, Val, ShiftAmount);
// Store the two parts
SDValue Store1, Store2;
Store1 = DAG.getTruncStore(Chain, dl, TLI.isLittleEndian()?Lo:Hi, Ptr,
ST->getPointerInfo(), NewStoredVT,
ST->isVolatile(), ST->isNonTemporal(), Alignment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
DAG.getConstant(IncrementSize, TLI.getPointerTy()));
Alignment = MinAlign(Alignment, IncrementSize);
Store2 = DAG.getTruncStore(Chain, dl, TLI.isLittleEndian()?Hi:Lo, Ptr,
ST->getPointerInfo().getWithOffset(IncrementSize),
NewStoredVT, ST->isVolatile(), ST->isNonTemporal(),
Alignment);
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Store1, Store2);
}
/// ExpandUnalignedLoad - Expands an unaligned load to 2 half-size loads.
static
SDValue ExpandUnalignedLoad(LoadSDNode *LD, SelectionDAG &DAG,
const TargetLowering &TLI) {
SDValue Chain = LD->getChain();
SDValue Ptr = LD->getBasePtr();
EVT VT = LD->getValueType(0);
EVT LoadedVT = LD->getMemoryVT();
DebugLoc dl = LD->getDebugLoc();
if (VT.isFloatingPoint() || VT.isVector()) {
EVT intVT = EVT::getIntegerVT(*DAG.getContext(), LoadedVT.getSizeInBits());
if (TLI.isTypeLegal(intVT)) {
// Expand to a (misaligned) integer load of the same size,
// then bitconvert to floating point or vector.
SDValue newLoad = DAG.getLoad(intVT, dl, Chain, Ptr, LD->getPointerInfo(),
LD->isVolatile(),
LD->isNonTemporal(), LD->getAlignment());
SDValue Result = DAG.getNode(ISD::BITCAST, dl, LoadedVT, newLoad);
if (VT.isFloatingPoint() && LoadedVT != VT)
Result = DAG.getNode(ISD::FP_EXTEND, dl, VT, Result);
SDValue Ops[] = { Result, Chain };
return DAG.getMergeValues(Ops, 2, dl);
}
// Copy the value to a (aligned) stack slot using (unaligned) integer
// loads and stores, then do a (aligned) load from the stack slot.
EVT RegVT = TLI.getRegisterType(*DAG.getContext(), intVT);
unsigned LoadedBytes = LoadedVT.getSizeInBits() / 8;
unsigned RegBytes = RegVT.getSizeInBits() / 8;
unsigned NumRegs = (LoadedBytes + RegBytes - 1) / RegBytes;
// Make sure the stack slot is also aligned for the register type.
SDValue StackBase = DAG.CreateStackTemporary(LoadedVT, RegVT);
SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
SmallVector<SDValue, 8> Stores;
SDValue StackPtr = StackBase;
unsigned Offset = 0;
// Do all but one copies using the full register width.
for (unsigned i = 1; i < NumRegs; i++) {
// Load one integer register's worth from the original location.
SDValue Load = DAG.getLoad(RegVT, dl, Chain, Ptr,
LD->getPointerInfo().getWithOffset(Offset),
LD->isVolatile(), LD->isNonTemporal(),
MinAlign(LD->getAlignment(), Offset));
// Follow the load with a store to the stack slot. Remember the store.
Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, StackPtr,
MachinePointerInfo(), false, false, 0));
// Increment the pointers.
Offset += RegBytes;
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
Increment);
}
// The last copy may be partial. Do an extending load.
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
8 * (LoadedBytes - Offset));
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Chain, Ptr,
LD->getPointerInfo().getWithOffset(Offset),
MemVT, LD->isVolatile(),
LD->isNonTemporal(),
MinAlign(LD->getAlignment(), Offset));
// Follow the load with a store to the stack slot. Remember the store.
// On big-endian machines this requires a truncating store to ensure
// that the bits end up in the right place.
Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, StackPtr,
MachinePointerInfo(), MemVT,
false, false, 0));
// The order of the stores doesn't matter - say it with a TokenFactor.
SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
Stores.size());
// Finally, perform the original load only redirected to the stack slot.
Load = DAG.getExtLoad(LD->getExtensionType(), dl, VT, TF, StackBase,
MachinePointerInfo(), LoadedVT, false, false, 0);
// Callers expect a MERGE_VALUES node.
SDValue Ops[] = { Load, TF };
return DAG.getMergeValues(Ops, 2, dl);
}
assert(LoadedVT.isInteger() && !LoadedVT.isVector() &&
"Unaligned load of unsupported type.");
// Compute the new VT that is half the size of the old one. This is an
// integer MVT.
unsigned NumBits = LoadedVT.getSizeInBits();
EVT NewLoadedVT;
NewLoadedVT = EVT::getIntegerVT(*DAG.getContext(), NumBits/2);
NumBits >>= 1;
unsigned Alignment = LD->getAlignment();
unsigned IncrementSize = NumBits / 8;
ISD::LoadExtType HiExtType = LD->getExtensionType();
// If the original load is NON_EXTLOAD, the hi part load must be ZEXTLOAD.
if (HiExtType == ISD::NON_EXTLOAD)
HiExtType = ISD::ZEXTLOAD;
// Load the value in two parts
SDValue Lo, Hi;
if (TLI.isLittleEndian()) {
Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, VT, Chain, Ptr, LD->getPointerInfo(),
NewLoadedVT, LD->isVolatile(),
LD->isNonTemporal(), Alignment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
DAG.getConstant(IncrementSize, TLI.getPointerTy()));
Hi = DAG.getExtLoad(HiExtType, dl, VT, Chain, Ptr,
LD->getPointerInfo().getWithOffset(IncrementSize),
NewLoadedVT, LD->isVolatile(),
LD->isNonTemporal(), MinAlign(Alignment,IncrementSize));
} else {
Hi = DAG.getExtLoad(HiExtType, dl, VT, Chain, Ptr, LD->getPointerInfo(),
NewLoadedVT, LD->isVolatile(),
LD->isNonTemporal(), Alignment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
DAG.getConstant(IncrementSize, TLI.getPointerTy()));
Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, VT, Chain, Ptr,
LD->getPointerInfo().getWithOffset(IncrementSize),
NewLoadedVT, LD->isVolatile(),
LD->isNonTemporal(), MinAlign(Alignment,IncrementSize));
}
// aggregate the two parts
SDValue ShiftAmount = DAG.getConstant(NumBits,
TLI.getShiftAmountTy(Hi.getValueType()));
SDValue Result = DAG.getNode(ISD::SHL, dl, VT, Hi, ShiftAmount);
Result = DAG.getNode(ISD::OR, dl, VT, Result, Lo);
SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
Hi.getValue(1));
SDValue Ops[] = { Result, TF };
return DAG.getMergeValues(Ops, 2, dl);
}
/// PerformInsertVectorEltInMemory - Some target cannot handle a variable
/// insertion index for the INSERT_VECTOR_ELT instruction. In this case, it
/// is necessary to spill the vector being inserted into to memory, perform
/// the insert there, and then read the result back.
SDValue SelectionDAGLegalize::
PerformInsertVectorEltInMemory(SDValue Vec, SDValue Val, SDValue Idx,
DebugLoc dl) {
SDValue Tmp1 = Vec;
SDValue Tmp2 = Val;
SDValue Tmp3 = Idx;
// If the target doesn't support this, we have to spill the input vector
// to a temporary stack slot, update the element, then reload it. This is
// badness. We could also load the value into a vector register (either
// with a "move to register" or "extload into register" instruction, then
// permute it into place, if the idx is a constant and if the idx is
// supported by the target.
EVT VT = Tmp1.getValueType();
EVT EltVT = VT.getVectorElementType();
EVT IdxVT = Tmp3.getValueType();
EVT PtrVT = TLI.getPointerTy();
SDValue StackPtr = DAG.CreateStackTemporary(VT);
int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
// Store the vector.
SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Tmp1, StackPtr,
MachinePointerInfo::getFixedStack(SPFI),
false, false, 0);
// Truncate or zero extend offset to target pointer type.
unsigned CastOpc = IdxVT.bitsGT(PtrVT) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
Tmp3 = DAG.getNode(CastOpc, dl, PtrVT, Tmp3);
// Add the offset to the index.
unsigned EltSize = EltVT.getSizeInBits()/8;
Tmp3 = DAG.getNode(ISD::MUL, dl, IdxVT, Tmp3,DAG.getConstant(EltSize, IdxVT));
SDValue StackPtr2 = DAG.getNode(ISD::ADD, dl, IdxVT, Tmp3, StackPtr);
// Store the scalar value.
Ch = DAG.getTruncStore(Ch, dl, Tmp2, StackPtr2, MachinePointerInfo(), EltVT,
false, false, 0);
// Load the updated vector.
return DAG.getLoad(VT, dl, Ch, StackPtr,
MachinePointerInfo::getFixedStack(SPFI), false, false, 0);
}
SDValue SelectionDAGLegalize::
ExpandINSERT_VECTOR_ELT(SDValue Vec, SDValue Val, SDValue Idx, DebugLoc dl) {
if (ConstantSDNode *InsertPos = dyn_cast<ConstantSDNode>(Idx)) {
// SCALAR_TO_VECTOR requires that the type of the value being inserted
// match the element type of the vector being created, except for
// integers in which case the inserted value can be over width.
EVT EltVT = Vec.getValueType().getVectorElementType();
if (Val.getValueType() == EltVT ||
(EltVT.isInteger() && Val.getValueType().bitsGE(EltVT))) {
SDValue ScVec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
Vec.getValueType(), Val);
unsigned NumElts = Vec.getValueType().getVectorNumElements();
// We generate a shuffle of InVec and ScVec, so the shuffle mask
// should be 0,1,2,3,4,5... with the appropriate element replaced with
// elt 0 of the RHS.
SmallVector<int, 8> ShufOps;
for (unsigned i = 0; i != NumElts; ++i)
ShufOps.push_back(i != InsertPos->getZExtValue() ? i : NumElts);
return DAG.getVectorShuffle(Vec.getValueType(), dl, Vec, ScVec,
&ShufOps[0]);
}
}
return PerformInsertVectorEltInMemory(Vec, Val, Idx, dl);
}
SDValue SelectionDAGLegalize::OptimizeFloatStore(StoreSDNode* ST) {
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
// FIXME: We shouldn't do this for TargetConstantFP's.
// FIXME: move this to the DAG Combiner! Note that we can't regress due
// to phase ordering between legalized code and the dag combiner. This
// probably means that we need to integrate dag combiner and legalizer
// together.
// We generally can't do this one for long doubles.
SDValue Tmp1 = ST->getChain();
SDValue Tmp2 = ST->getBasePtr();
SDValue Tmp3;
unsigned Alignment = ST->getAlignment();
bool isVolatile = ST->isVolatile();
bool isNonTemporal = ST->isNonTemporal();
DebugLoc dl = ST->getDebugLoc();
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(ST->getValue())) {
if (CFP->getValueType(0) == MVT::f32 &&
TLI.isTypeLegal(MVT::i32)) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().
bitcastToAPInt().zextOrTrunc(32),
MVT::i32);
return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
isVolatile, isNonTemporal, Alignment);
}
if (CFP->getValueType(0) == MVT::f64) {
// If this target supports 64-bit registers, do a single 64-bit store.
if (TLI.isTypeLegal(MVT::i64)) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().bitcastToAPInt().
zextOrTrunc(64), MVT::i64);
return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
isVolatile, isNonTemporal, Alignment);
}
if (TLI.isTypeLegal(MVT::i32) && !ST->isVolatile()) {
// Otherwise, if the target supports 32-bit registers, use 2 32-bit
// stores. If the target supports neither 32- nor 64-bits, this
// xform is certainly not worth it.
const APInt &IntVal =CFP->getValueAPF().bitcastToAPInt();
SDValue Lo = DAG.getConstant(IntVal.trunc(32), MVT::i32);
SDValue Hi = DAG.getConstant(IntVal.lshr(32).trunc(32), MVT::i32);
if (TLI.isBigEndian()) std::swap(Lo, Hi);
Lo = DAG.getStore(Tmp1, dl, Lo, Tmp2, ST->getPointerInfo(), isVolatile,
isNonTemporal, Alignment);
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(4));
Hi = DAG.getStore(Tmp1, dl, Hi, Tmp2,
ST->getPointerInfo().getWithOffset(4),
isVolatile, isNonTemporal, MinAlign(Alignment, 4U));
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
}
}
}
return SDValue(0, 0);
}
/// LegalizeOp - Return a legal replacement for the given operation, with
/// all legal operands.
SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
if (Op.getOpcode() == ISD::TargetConstant) // Allow illegal target nodes.
return Op;
SDNode *Node = Op.getNode();
DebugLoc dl = Node->getDebugLoc();
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
assert(TLI.getTypeAction(*DAG.getContext(), Node->getValueType(i)) ==
TargetLowering::TypeLegal &&
"Unexpected illegal type!");
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
assert((TLI.getTypeAction(*DAG.getContext(),
Node->getOperand(i).getValueType()) ==
TargetLowering::TypeLegal ||
Node->getOperand(i).getOpcode() == ISD::TargetConstant) &&
"Unexpected illegal type!");
// Note that LegalizeOp may be reentered even from single-use nodes, which
// means that we always must cache transformed nodes.
DenseMap<SDValue, SDValue>::iterator I = LegalizedNodes.find(Op);
if (I != LegalizedNodes.end()) return I->second;
SDValue Tmp1, Tmp2, Tmp3, Tmp4;
SDValue Result = Op;
bool isCustom = false;
// Figure out the correct action; the way to query this varies by opcode
TargetLowering::LegalizeAction Action = TargetLowering::Legal;
bool SimpleFinishLegalizing = true;
switch (Node->getOpcode()) {
case ISD::INTRINSIC_W_CHAIN:
case ISD::INTRINSIC_WO_CHAIN:
case ISD::INTRINSIC_VOID:
case ISD::VAARG:
case ISD::STACKSAVE:
Action = TLI.getOperationAction(Node->getOpcode(), MVT::Other);
break;
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP:
case ISD::EXTRACT_VECTOR_ELT:
Action = TLI.getOperationAction(Node->getOpcode(),
Node->getOperand(0).getValueType());
break;
case ISD::FP_ROUND_INREG:
case ISD::SIGN_EXTEND_INREG: {
EVT InnerType = cast<VTSDNode>(Node->getOperand(1))->getVT();
Action = TLI.getOperationAction(Node->getOpcode(), InnerType);
break;
}
case ISD::ATOMIC_STORE: {
Action = TLI.getOperationAction(Node->getOpcode(),
Node->getOperand(2).getValueType());
break;
}
case ISD::SELECT_CC:
case ISD::SETCC:
case ISD::BR_CC: {
unsigned CCOperand = Node->getOpcode() == ISD::SELECT_CC ? 4 :
Node->getOpcode() == ISD::SETCC ? 2 : 1;
unsigned CompareOperand = Node->getOpcode() == ISD::BR_CC ? 2 : 0;
EVT OpVT = Node->getOperand(CompareOperand).getValueType();
ISD::CondCode CCCode =
cast<CondCodeSDNode>(Node->getOperand(CCOperand))->get();
Action = TLI.getCondCodeAction(CCCode, OpVT);
if (Action == TargetLowering::Legal) {
if (Node->getOpcode() == ISD::SELECT_CC)
Action = TLI.getOperationAction(Node->getOpcode(),
Node->getValueType(0));
else
Action = TLI.getOperationAction(Node->getOpcode(), OpVT);
}
break;
}
case ISD::LOAD:
case ISD::STORE:
// FIXME: Model these properly. LOAD and STORE are complicated, and
// STORE expects the unlegalized operand in some cases.
SimpleFinishLegalizing = false;
break;
case ISD::CALLSEQ_START:
case ISD::CALLSEQ_END:
// FIXME: This shouldn't be necessary. These nodes have special properties
// dealing with the recursive nature of legalization. Removing this
// special case should be done as part of making LegalizeDAG non-recursive.
SimpleFinishLegalizing = false;
break;
case ISD::EXTRACT_ELEMENT:
case ISD::FLT_ROUNDS_:
case ISD::SADDO:
case ISD::SSUBO:
case ISD::UADDO:
case ISD::USUBO:
case ISD::SMULO:
case ISD::UMULO:
case ISD::FPOWI:
case ISD::MERGE_VALUES:
case ISD::EH_RETURN:
case ISD::FRAME_TO_ARGS_OFFSET:
case ISD::EH_SJLJ_SETJMP:
case ISD::EH_SJLJ_LONGJMP:
case ISD::EH_SJLJ_DISPATCHSETUP:
// These operations lie about being legal: when they claim to be legal,
// they should actually be expanded.
Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
if (Action == TargetLowering::Legal)
Action = TargetLowering::Expand;
break;
case ISD::INIT_TRAMPOLINE:
case ISD::ADJUST_TRAMPOLINE:
case ISD::FRAMEADDR:
case ISD::RETURNADDR:
// These operations lie about being legal: when they claim to be legal,
// they should actually be custom-lowered.
Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
if (Action == TargetLowering::Legal)
Action = TargetLowering::Custom;
break;
case ISD::BUILD_VECTOR:
// A weird case: legalization for BUILD_VECTOR never legalizes the
// operands!
// FIXME: This really sucks... changing it isn't semantically incorrect,
// but it massively pessimizes the code for floating-point BUILD_VECTORs
// because ConstantFP operands get legalized into constant pool loads
// before the BUILD_VECTOR code can see them. It doesn't usually bite,
// though, because BUILD_VECTORS usually get lowered into other nodes
// which get legalized properly.
SimpleFinishLegalizing = false;
break;
default:
if (Node->getOpcode() >= ISD::BUILTIN_OP_END) {
Action = TargetLowering::Legal;
} else {
Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
}
break;
}
if (SimpleFinishLegalizing) {
SmallVector<SDValue, 8> Ops, ResultVals;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
Ops.push_back(LegalizeOp(Node->getOperand(i)));
switch (Node->getOpcode()) {
default: break;
case ISD::BR:
case ISD::BRIND:
case ISD::BR_JT:
case ISD::BR_CC:
case ISD::BRCOND:
// Branches tweak the chain to include LastCALLSEQ_END
Ops[0] = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Ops[0],
LastCALLSEQ_END);
Ops[0] = LegalizeOp(Ops[0]);
LastCALLSEQ_END = DAG.getEntryNode();
break;
case ISD::SHL:
case ISD::SRL:
case ISD::SRA:
case ISD::ROTL:
case ISD::ROTR:
// Legalizing shifts/rotates requires adjusting the shift amount
// to the appropriate width.
if (!Ops[1].getValueType().isVector())
Ops[1] = LegalizeOp(DAG.getShiftAmountOperand(Ops[0].getValueType(),
Ops[1]));
break;
case ISD::SRL_PARTS:
case ISD::SRA_PARTS:
case ISD::SHL_PARTS:
// Legalizing shifts/rotates requires adjusting the shift amount
// to the appropriate width.
if (!Ops[2].getValueType().isVector())
Ops[2] = LegalizeOp(DAG.getShiftAmountOperand(Ops[0].getValueType(),
Ops[2]));
break;
}
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(), Ops.data(),
Ops.size()), 0);
switch (Action) {
case TargetLowering::Legal:
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
ResultVals.push_back(Result.getValue(i));
break;
case TargetLowering::Custom:
// FIXME: The handling for custom lowering with multiple results is
// a complete mess.
Tmp1 = TLI.LowerOperation(Result, DAG);
if (Tmp1.getNode()) {
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i) {
if (e == 1)
ResultVals.push_back(Tmp1);
else
ResultVals.push_back(Tmp1.getValue(i));
}
break;
}
// FALL THROUGH
case TargetLowering::Expand:
ExpandNode(Result.getNode(), ResultVals);
break;
case TargetLowering::Promote:
PromoteNode(Result.getNode(), ResultVals);
break;
}
if (!ResultVals.empty()) {
for (unsigned i = 0, e = ResultVals.size(); i != e; ++i) {
if (ResultVals[i] != SDValue(Node, i))
ResultVals[i] = LegalizeOp(ResultVals[i]);
AddLegalizedOperand(SDValue(Node, i), ResultVals[i]);
}
return ResultVals[Op.getResNo()];
}
}
switch (Node->getOpcode()) {
default:
#ifndef NDEBUG
dbgs() << "NODE: ";
Node->dump( &DAG);
dbgs() << "\n";
#endif
assert(0 && "Do not know how to legalize this operator!");
case ISD::BUILD_VECTOR:
switch (TLI.getOperationAction(ISD::BUILD_VECTOR, Node->getValueType(0))) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Custom:
Tmp3 = TLI.LowerOperation(Result, DAG);
if (Tmp3.getNode()) {
Result = Tmp3;
break;
}
// FALLTHROUGH
case TargetLowering::Expand:
Result = ExpandBUILD_VECTOR(Result.getNode());
break;
}
break;
case ISD::CALLSEQ_START: {
SDNode *CallEnd = FindCallEndFromCallStart(Node);
// Recursively Legalize all of the inputs of the call end that do not lead
// to this call start. This ensures that any libcalls that need be inserted
// are inserted *before* the CALLSEQ_START.
{SmallPtrSet<SDNode*, 32> NodesLeadingTo;
for (unsigned i = 0, e = CallEnd->getNumOperands(); i != e; ++i)
LegalizeAllNodesNotLeadingTo(CallEnd->getOperand(i).getNode(), Node,
NodesLeadingTo);
}
// Now that we have legalized all of the inputs (which may have inserted
// libcalls), create the new CALLSEQ_START node.
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
// Merge in the last call to ensure that this call starts after the last
// call ended.
if (LastCALLSEQ_END.getOpcode() != ISD::EntryToken) {
Tmp1 = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
Tmp1, LastCALLSEQ_END);
Tmp1 = LegalizeOp(Tmp1);
}
// Do not try to legalize the target-specific arguments (#1+).
if (Tmp1 != Node->getOperand(0)) {
SmallVector<SDValue, 8> Ops(Node->op_begin(), Node->op_end());
Ops[0] = Tmp1;
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(), &Ops[0],
Ops.size()), Result.getResNo());
}
// Remember that the CALLSEQ_START is legalized.
AddLegalizedOperand(Op.getValue(0), Result);
if (Node->getNumValues() == 2) // If this has a flag result, remember it.
AddLegalizedOperand(Op.getValue(1), Result.getValue(1));
// Now that the callseq_start and all of the non-call nodes above this call
// sequence have been legalized, legalize the call itself. During this
// process, no libcalls can/will be inserted, guaranteeing that no calls
// can overlap.
assert(!IsLegalizingCall && "Inconsistent sequentialization of calls!");
// Note that we are selecting this call!
LastCALLSEQ_END = SDValue(CallEnd, 0);
IsLegalizingCall = true;
// Legalize the call, starting from the CALLSEQ_END.
LegalizeOp(LastCALLSEQ_END);
assert(!IsLegalizingCall && "CALLSEQ_END should have cleared this!");
return Result;
}
case ISD::CALLSEQ_END:
// If the CALLSEQ_START node hasn't been legalized first, legalize it. This
// will cause this node to be legalized as well as handling libcalls right.
if (LastCALLSEQ_END.getNode() != Node) {
LegalizeOp(SDValue(FindCallStartFromCallEnd(Node), 0));
DenseMap<SDValue, SDValue>::iterator I = LegalizedNodes.find(Op);
assert(I != LegalizedNodes.end() &&
"Legalizing the call start should have legalized this node!");
return I->second;
}
// Otherwise, the call start has been legalized and everything is going
// according to plan. Just legalize ourselves normally here.
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
// Do not try to legalize the target-specific arguments (#1+), except for
// an optional flag input.
if (Node->getOperand(Node->getNumOperands()-1).getValueType() != MVT::Glue){
if (Tmp1 != Node->getOperand(0)) {
SmallVector<SDValue, 8> Ops(Node->op_begin(), Node->op_end());
Ops[0] = Tmp1;
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
&Ops[0], Ops.size()),
Result.getResNo());
}
} else {
Tmp2 = LegalizeOp(Node->getOperand(Node->getNumOperands()-1));
if (Tmp1 != Node->getOperand(0) ||
Tmp2 != Node->getOperand(Node->getNumOperands()-1)) {
SmallVector<SDValue, 8> Ops(Node->op_begin(), Node->op_end());
Ops[0] = Tmp1;
Ops.back() = Tmp2;
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
&Ops[0], Ops.size()),
Result.getResNo());
}
}
assert(IsLegalizingCall && "Call sequence imbalance between start/end?");
// This finishes up call legalization.
IsLegalizingCall = false;
// If the CALLSEQ_END node has a flag, remember that we legalized it.
AddLegalizedOperand(SDValue(Node, 0), Result.getValue(0));
if (Node->getNumValues() == 2)
AddLegalizedOperand(SDValue(Node, 1), Result.getValue(1));
return Result.getValue(Op.getResNo());
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(Node);
Tmp1 = LegalizeOp(LD->getChain()); // Legalize the chain.
Tmp2 = LegalizeOp(LD->getBasePtr()); // Legalize the base pointer.
ISD::LoadExtType ExtType = LD->getExtensionType();
if (ExtType == ISD::NON_EXTLOAD) {
EVT VT = Node->getValueType(0);
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
Tmp1, Tmp2, LD->getOffset()),
Result.getResNo());
Tmp3 = Result.getValue(0);
Tmp4 = Result.getValue(1);
switch (TLI.getOperationAction(Node->getOpcode(), VT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
// If this is an unaligned load and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
Type *Ty = LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
unsigned ABIAlignment = TLI.getTargetData()->getABITypeAlignment(Ty);
if (LD->getAlignment() < ABIAlignment){
Result = ExpandUnalignedLoad(cast<LoadSDNode>(Result.getNode()),
DAG, TLI);
Tmp3 = Result.getOperand(0);
Tmp4 = Result.getOperand(1);
Tmp3 = LegalizeOp(Tmp3);
Tmp4 = LegalizeOp(Tmp4);
}
}
break;
case TargetLowering::Custom:
Tmp1 = TLI.LowerOperation(Tmp3, DAG);
if (Tmp1.getNode()) {
Tmp3 = LegalizeOp(Tmp1);
Tmp4 = LegalizeOp(Tmp1.getValue(1));
}
break;
case TargetLowering::Promote: {
// Only promote a load of vector type to another.
assert(VT.isVector() && "Cannot promote this load!");
// Change base type to a different vector type.
EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), VT);
Tmp1 = DAG.getLoad(NVT, dl, Tmp1, Tmp2, LD->getPointerInfo(),
LD->isVolatile(), LD->isNonTemporal(),
LD->getAlignment());
Tmp3 = LegalizeOp(DAG.getNode(ISD::BITCAST, dl, VT, Tmp1));
Tmp4 = LegalizeOp(Tmp1.getValue(1));
break;
}
}
// Since loads produce two values, make sure to remember that we
// legalized both of them.
AddLegalizedOperand(SDValue(Node, 0), Tmp3);
AddLegalizedOperand(SDValue(Node, 1), Tmp4);
return Op.getResNo() ? Tmp4 : Tmp3;
}
EVT SrcVT = LD->getMemoryVT();
unsigned SrcWidth = SrcVT.getSizeInBits();
unsigned Alignment = LD->getAlignment();
bool isVolatile = LD->isVolatile();
bool isNonTemporal = LD->isNonTemporal();
if (SrcWidth != SrcVT.getStoreSizeInBits() &&
// Some targets pretend to have an i1 loading operation, and actually
// load an i8. This trick is correct for ZEXTLOAD because the top 7
// bits are guaranteed to be zero; it helps the optimizers understand
// that these bits are zero. It is also useful for EXTLOAD, since it
// tells the optimizers that those bits are undefined. It would be
// nice to have an effective generic way of getting these benefits...
// Until such a way is found, don't insist on promoting i1 here.
(SrcVT != MVT::i1 ||
TLI.getLoadExtAction(ExtType, MVT::i1) == TargetLowering::Promote)) {
// Promote to a byte-sized load if not loading an integral number of
// bytes. For example, promote EXTLOAD:i20 -> EXTLOAD:i24.
unsigned NewWidth = SrcVT.getStoreSizeInBits();
EVT NVT = EVT::getIntegerVT(*DAG.getContext(), NewWidth);
SDValue Ch;
// The extra bits are guaranteed to be zero, since we stored them that
// way. A zext load from NVT thus automatically gives zext from SrcVT.
ISD::LoadExtType NewExtType =
ExtType == ISD::ZEXTLOAD ? ISD::ZEXTLOAD : ISD::EXTLOAD;
Result = DAG.getExtLoad(NewExtType, dl, Node->getValueType(0),
Tmp1, Tmp2, LD->getPointerInfo(),
NVT, isVolatile, isNonTemporal, Alignment);
Ch = Result.getValue(1); // The chain.
if (ExtType == ISD::SEXTLOAD)
// Having the top bits zero doesn't help when sign extending.
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
Result.getValueType(),
Result, DAG.getValueType(SrcVT));
else if (ExtType == ISD::ZEXTLOAD || NVT == Result.getValueType())
// All the top bits are guaranteed to be zero - inform the optimizers.
Result = DAG.getNode(ISD::AssertZext, dl,
Result.getValueType(), Result,
DAG.getValueType(SrcVT));
Tmp1 = LegalizeOp(Result);
Tmp2 = LegalizeOp(Ch);
} else if (SrcWidth & (SrcWidth - 1)) {
// If not loading a power-of-2 number of bits, expand as two loads.
assert(!SrcVT.isVector() && "Unsupported extload!");
unsigned RoundWidth = 1 << Log2_32(SrcWidth);
assert(RoundWidth < SrcWidth);
unsigned ExtraWidth = SrcWidth - RoundWidth;
assert(ExtraWidth < RoundWidth);
assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
"Load size not an integral number of bytes!");
EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
SDValue Lo, Hi, Ch;
unsigned IncrementSize;
if (TLI.isLittleEndian()) {
// EXTLOAD:i24 -> ZEXTLOAD:i16 | (shl EXTLOAD@+2:i8, 16)
// Load the bottom RoundWidth bits.
Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, Node->getValueType(0),
Tmp1, Tmp2,
LD->getPointerInfo(), RoundVT, isVolatile,
isNonTemporal, Alignment);
// Load the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
LD->getPointerInfo().getWithOffset(IncrementSize),
ExtraVT, isVolatile, isNonTemporal,
MinAlign(Alignment, IncrementSize));
// Build a factor node to remember that this load is independent of
// the other one.
Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
Hi.getValue(1));
// Move the top bits to the right place.
Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
DAG.getConstant(RoundWidth,
TLI.getShiftAmountTy(Hi.getValueType())));
// Join the hi and lo parts.
Result = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
} else {
// Big endian - avoid unaligned loads.
// EXTLOAD:i24 -> (shl EXTLOAD:i16, 8) | ZEXTLOAD@+2:i8
// Load the top RoundWidth bits.
Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
LD->getPointerInfo(), RoundVT, isVolatile,
isNonTemporal, Alignment);
// Load the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Lo = DAG.getExtLoad(ISD::ZEXTLOAD,
dl, Node->getValueType(0), Tmp1, Tmp2,
LD->getPointerInfo().getWithOffset(IncrementSize),
ExtraVT, isVolatile, isNonTemporal,
MinAlign(Alignment, IncrementSize));
// Build a factor node to remember that this load is independent of
// the other one.
Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
Hi.getValue(1));
// Move the top bits to the right place.
Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
DAG.getConstant(ExtraWidth,
TLI.getShiftAmountTy(Hi.getValueType())));
// Join the hi and lo parts.
Result = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
}
Tmp1 = LegalizeOp(Result);
Tmp2 = LegalizeOp(Ch);
} else {
switch (TLI.getLoadExtAction(ExtType, SrcVT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Custom:
isCustom = true;
// FALLTHROUGH
case TargetLowering::Legal:
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
Tmp1, Tmp2, LD->getOffset()),
Result.getResNo());
Tmp1 = Result.getValue(0);
Tmp2 = Result.getValue(1);
if (isCustom) {
Tmp3 = TLI.LowerOperation(Result, DAG);
if (Tmp3.getNode()) {
Tmp1 = LegalizeOp(Tmp3);
Tmp2 = LegalizeOp(Tmp3.getValue(1));
}
} else {
// If this is an unaligned load and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
Type *Ty =
LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
unsigned ABIAlignment =
TLI.getTargetData()->getABITypeAlignment(Ty);
if (LD->getAlignment() < ABIAlignment){
Result = ExpandUnalignedLoad(cast<LoadSDNode>(Result.getNode()),
DAG, TLI);
Tmp1 = Result.getOperand(0);
Tmp2 = Result.getOperand(1);
Tmp1 = LegalizeOp(Tmp1);
Tmp2 = LegalizeOp(Tmp2);
}
}
}
break;
case TargetLowering::Expand:
if (!TLI.isLoadExtLegal(ISD::EXTLOAD, SrcVT) && TLI.isTypeLegal(SrcVT)) {
SDValue Load = DAG.getLoad(SrcVT, dl, Tmp1, Tmp2,
LD->getPointerInfo(),
LD->isVolatile(), LD->isNonTemporal(),
LD->getAlignment());
unsigned ExtendOp;
switch (ExtType) {
case ISD::EXTLOAD:
ExtendOp = (SrcVT.isFloatingPoint() ?
ISD::FP_EXTEND : ISD::ANY_EXTEND);
break;
case ISD::SEXTLOAD: ExtendOp = ISD::SIGN_EXTEND; break;
case ISD::ZEXTLOAD: ExtendOp = ISD::ZERO_EXTEND; break;
default: llvm_unreachable("Unexpected extend load type!");
}
Result = DAG.getNode(ExtendOp, dl, Node->getValueType(0), Load);
Tmp1 = LegalizeOp(Result); // Relegalize new nodes.
Tmp2 = LegalizeOp(Load.getValue(1));
break;
}
// If this is a promoted vector load, and the vector element types are
// legal, then scalarize it.
if (ExtType == ISD::EXTLOAD && SrcVT.isVector() &&
TLI.isTypeLegal(Node->getValueType(0).getScalarType())) {
SmallVector<SDValue, 8> LoadVals;
SmallVector<SDValue, 8> LoadChains;
unsigned NumElem = SrcVT.getVectorNumElements();
unsigned Stride = SrcVT.getScalarType().getSizeInBits()/8;
for (unsigned Idx=0; Idx<NumElem; Idx++) {
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(Stride));
SDValue ScalarLoad = DAG.getExtLoad(ISD::EXTLOAD, dl,
Node->getValueType(0).getScalarType(),
Tmp1, Tmp2, LD->getPointerInfo().getWithOffset(Idx * Stride),
SrcVT.getScalarType(),
LD->isVolatile(), LD->isNonTemporal(),
LD->getAlignment());
LoadVals.push_back(ScalarLoad.getValue(0));
LoadChains.push_back(ScalarLoad.getValue(1));
}
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&LoadChains[0], LoadChains.size());
SDValue ValRes = DAG.getNode(ISD::BUILD_VECTOR, dl,
Node->getValueType(0), &LoadVals[0], LoadVals.size());
Tmp1 = LegalizeOp(ValRes); // Relegalize new nodes.
Tmp2 = LegalizeOp(Result.getValue(0)); // Relegalize new nodes.
break;
}
// If this is a promoted vector load, and the vector element types are
// illegal, create the promoted vector from bitcasted segments.
if (ExtType == ISD::EXTLOAD && SrcVT.isVector()) {
EVT MemElemTy = Node->getValueType(0).getScalarType();
EVT SrcSclrTy = SrcVT.getScalarType();
unsigned SizeRatio =
(MemElemTy.getSizeInBits() / SrcSclrTy.getSizeInBits());
SmallVector<SDValue, 8> LoadVals;
SmallVector<SDValue, 8> LoadChains;
unsigned NumElem = SrcVT.getVectorNumElements();
unsigned Stride = SrcVT.getScalarType().getSizeInBits()/8;
for (unsigned Idx=0; Idx<NumElem; Idx++) {
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(Stride));
SDValue ScalarLoad = DAG.getExtLoad(ISD::EXTLOAD, dl,
SrcVT.getScalarType(),
Tmp1, Tmp2, LD->getPointerInfo().getWithOffset(Idx * Stride),
SrcVT.getScalarType(),
LD->isVolatile(), LD->isNonTemporal(),
LD->getAlignment());
if (TLI.isBigEndian()) {
// MSB (which is garbage, comes first)
LoadVals.push_back(ScalarLoad.getValue(0));
for (unsigned i = 0; i<SizeRatio-1; ++i)
LoadVals.push_back(DAG.getUNDEF(SrcVT.getScalarType()));
} else {
// LSB (which is data, comes first)
for (unsigned i = 0; i<SizeRatio-1; ++i)
LoadVals.push_back(DAG.getUNDEF(SrcVT.getScalarType()));
LoadVals.push_back(ScalarLoad.getValue(0));
}
LoadChains.push_back(ScalarLoad.getValue(1));
}
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&LoadChains[0], LoadChains.size());
EVT TempWideVector = EVT::getVectorVT(*DAG.getContext(),
SrcVT.getScalarType(), NumElem*SizeRatio);
SDValue ValRes = DAG.getNode(ISD::BUILD_VECTOR, dl,
TempWideVector, &LoadVals[0], LoadVals.size());
// Cast to the correct type
ValRes = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0), ValRes);
Tmp1 = LegalizeOp(ValRes); // Relegalize new nodes.
Tmp2 = LegalizeOp(Result.getValue(0)); // Relegalize new nodes.
break;
}
// FIXME: This does not work for vectors on most targets. Sign- and
// zero-extend operations are currently folded into extending loads,
// whether they are legal or not, and then we end up here without any
// support for legalizing them.
assert(ExtType != ISD::EXTLOAD &&
"EXTLOAD should always be supported!");
// Turn the unsupported load into an EXTLOAD followed by an explicit
// zero/sign extend inreg.
Result = DAG.getExtLoad(ISD::EXTLOAD, dl, Node->getValueType(0),
Tmp1, Tmp2, LD->getPointerInfo(), SrcVT,
LD->isVolatile(), LD->isNonTemporal(),
LD->getAlignment());
SDValue ValRes;
if (ExtType == ISD::SEXTLOAD)
ValRes = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
Result.getValueType(),
Result, DAG.getValueType(SrcVT));
else
ValRes = DAG.getZeroExtendInReg(Result, dl, SrcVT.getScalarType());
Tmp1 = LegalizeOp(ValRes); // Relegalize new nodes.
Tmp2 = LegalizeOp(Result.getValue(1)); // Relegalize new nodes.
break;
}
}
// Since loads produce two values, make sure to remember that we legalized
// both of them.
AddLegalizedOperand(SDValue(Node, 0), Tmp1);
AddLegalizedOperand(SDValue(Node, 1), Tmp2);
return Op.getResNo() ? Tmp2 : Tmp1;
}
case ISD::STORE: {
StoreSDNode *ST = cast<StoreSDNode>(Node);
Tmp1 = LegalizeOp(ST->getChain()); // Legalize the chain.
Tmp2 = LegalizeOp(ST->getBasePtr()); // Legalize the pointer.
unsigned Alignment = ST->getAlignment();
bool isVolatile = ST->isVolatile();
bool isNonTemporal = ST->isNonTemporal();
if (!ST->isTruncatingStore()) {
if (SDNode *OptStore = OptimizeFloatStore(ST).getNode()) {
Result = SDValue(OptStore, 0);
break;
}
{
Tmp3 = LegalizeOp(ST->getValue());
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
Tmp1, Tmp3, Tmp2,
ST->getOffset()),
Result.getResNo());
EVT VT = Tmp3.getValueType();
switch (TLI.getOperationAction(ISD::STORE, VT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
// If this is an unaligned store and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
if (ST->getAlignment() < ABIAlignment)
Result = ExpandUnalignedStore(cast<StoreSDNode>(Result.getNode()),
DAG, TLI);
}
break;
case TargetLowering::Custom:
Tmp1 = TLI.LowerOperation(Result, DAG);
if (Tmp1.getNode()) Result = Tmp1;
break;
case TargetLowering::Promote:
assert(VT.isVector() && "Unknown legal promote case!");
Tmp3 = DAG.getNode(ISD::BITCAST, dl,
TLI.getTypeToPromoteTo(ISD::STORE, VT), Tmp3);
Result = DAG.getStore(Tmp1, dl, Tmp3, Tmp2,
ST->getPointerInfo(), isVolatile,
isNonTemporal, Alignment);
break;
}
break;
}
} else {
Tmp3 = LegalizeOp(ST->getValue());
EVT StVT = ST->getMemoryVT();
unsigned StWidth = StVT.getSizeInBits();
if (StWidth != StVT.getStoreSizeInBits()) {
// Promote to a byte-sized store with upper bits zero if not
// storing an integral number of bytes. For example, promote
// TRUNCSTORE:i1 X -> TRUNCSTORE:i8 (and X, 1)
EVT NVT = EVT::getIntegerVT(*DAG.getContext(),
StVT.getStoreSizeInBits());
Tmp3 = DAG.getZeroExtendInReg(Tmp3, dl, StVT);
Result = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
NVT, isVolatile, isNonTemporal, Alignment);
} else if (StWidth & (StWidth - 1)) {
// If not storing a power-of-2 number of bits, expand as two stores.
assert(!StVT.isVector() && "Unsupported truncstore!");
unsigned RoundWidth = 1 << Log2_32(StWidth);
assert(RoundWidth < StWidth);
unsigned ExtraWidth = StWidth - RoundWidth;
assert(ExtraWidth < RoundWidth);
assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
"Store size not an integral number of bytes!");
EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
SDValue Lo, Hi;
unsigned IncrementSize;
if (TLI.isLittleEndian()) {
// TRUNCSTORE:i24 X -> TRUNCSTORE:i16 X, TRUNCSTORE@+2:i8 (srl X, 16)
// Store the bottom RoundWidth bits.
Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
RoundVT,
isVolatile, isNonTemporal, Alignment);
// Store the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
DAG.getConstant(RoundWidth,
TLI.getShiftAmountTy(Tmp3.getValueType())));
Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2,
ST->getPointerInfo().getWithOffset(IncrementSize),
ExtraVT, isVolatile, isNonTemporal,
MinAlign(Alignment, IncrementSize));
} else {
// Big endian - avoid unaligned stores.
// TRUNCSTORE:i24 X -> TRUNCSTORE:i16 (srl X, 8), TRUNCSTORE@+2:i8 X
// Store the top RoundWidth bits.
Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
DAG.getConstant(ExtraWidth,
TLI.getShiftAmountTy(Tmp3.getValueType())));
Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2, ST->getPointerInfo(),
RoundVT, isVolatile, isNonTemporal, Alignment);
// Store the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2,
ST->getPointerInfo().getWithOffset(IncrementSize),
ExtraVT, isVolatile, isNonTemporal,
MinAlign(Alignment, IncrementSize));
}
// The order of the stores doesn't matter.
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
} else {
if (Tmp1 != ST->getChain() || Tmp3 != ST->getValue() ||
Tmp2 != ST->getBasePtr())
Result = SDValue(DAG.UpdateNodeOperands(Result.getNode(),
Tmp1, Tmp3, Tmp2,
ST->getOffset()),
Result.getResNo());
switch (TLI.getTruncStoreAction(ST->getValue().getValueType(), StVT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
// If this is an unaligned store and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
if (ST->getAlignment() < ABIAlignment)
Result = ExpandUnalignedStore(cast<StoreSDNode>(Result.getNode()),
DAG, TLI);
}
break;
case TargetLowering::Custom:
Result = TLI.LowerOperation(Result, DAG);
break;
case TargetLowering::Expand:
EVT WideScalarVT = Tmp3.getValueType().getScalarType();
EVT NarrowScalarVT = StVT.getScalarType();
// The Store type is illegal, must scalarize the vector store.
SmallVector<SDValue, 8> Stores;
bool ScalarLegal = TLI.isTypeLegal(WideScalarVT);
if (!TLI.isTypeLegal(StVT) && StVT.isVector() && ScalarLegal) {
unsigned NumElem = StVT.getVectorNumElements();
unsigned ScalarSize = StVT.getScalarType().getSizeInBits();
// Round odd types to the next pow of two.
if (!isPowerOf2_32(ScalarSize))
ScalarSize = NextPowerOf2(ScalarSize);
// Types smaller than 8 bits are promoted to 8 bits.
ScalarSize = std::max<unsigned>(ScalarSize, 8);
// Store stride
unsigned Stride = ScalarSize/8;
assert(isPowerOf2_32(Stride) && "Stride must be a power of two");
for (unsigned Idx=0; Idx<NumElem; Idx++) {
SDValue Ex = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
WideScalarVT, Tmp3, DAG.getIntPtrConstant(Idx));
EVT NVT = EVT::getIntegerVT(*DAG.getContext(), ScalarSize);
Ex = DAG.getNode(ISD::TRUNCATE, dl, NVT, Ex);
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(Stride));
SDValue Store = DAG.getStore(Tmp1, dl, Ex, Tmp2,
ST->getPointerInfo().getWithOffset(Idx*Stride),
isVolatile, isNonTemporal, Alignment);
Stores.push_back(Store);
}
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&Stores[0], Stores.size());
break;
}
// The Store type is illegal, must scalarize the vector store.
// However, the scalar type is illegal. Must bitcast the result
// and store it in smaller parts.
if (!TLI.isTypeLegal(StVT) && StVT.isVector()) {
unsigned WideNumElem = StVT.getVectorNumElements();
unsigned Stride = NarrowScalarVT.getSizeInBits()/8;
unsigned SizeRatio =
(WideScalarVT.getSizeInBits() / NarrowScalarVT.getSizeInBits());
EVT CastValueVT = EVT::getVectorVT(*DAG.getContext(), NarrowScalarVT,
SizeRatio*WideNumElem);
// Cast the wide elem vector to wider vec with smaller elem type.
// Example <2 x i64> -> <4 x i32>
Tmp3 = DAG.getNode(ISD::BITCAST, dl, CastValueVT, Tmp3);
for (unsigned Idx=0; Idx<WideNumElem*SizeRatio; Idx++) {
// Extract elment i
SDValue Ex = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
NarrowScalarVT, Tmp3, DAG.getIntPtrConstant(Idx));
// bump pointer.
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(Stride));
// Store if, this element is:
// - First element on big endian, or
// - Last element on little endian
if (( TLI.isBigEndian() && (Idx%SizeRatio == 0)) ||
((!TLI.isBigEndian() && (Idx%SizeRatio == SizeRatio-1)))) {
SDValue Store = DAG.getStore(Tmp1, dl, Ex, Tmp2,
ST->getPointerInfo().getWithOffset(Idx*Stride),
isVolatile, isNonTemporal, Alignment);
Stores.push_back(Store);
}
}
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&Stores[0], Stores.size());
break;
}
// TRUNCSTORE:i16 i32 -> STORE i16
assert(TLI.isTypeLegal(StVT) && "Do not know how to expand this store!");
Tmp3 = DAG.getNode(ISD::TRUNCATE, dl, StVT, Tmp3);
Result = DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
isVolatile, isNonTemporal, Alignment);
break;
}
}
}
break;
}
}
assert(Result.getValueType() == Op.getValueType() &&
"Bad legalization!");
// Make sure that the generated code is itself legal.
if (Result != Op)
Result = LegalizeOp(Result);
// Note that LegalizeOp may be reentered even from single-use nodes, which
// means that we always must cache transformed nodes.
AddLegalizedOperand(Op, Result);
return Result;
}
SDValue SelectionDAGLegalize::ExpandExtractFromVectorThroughStack(SDValue Op) {
SDValue Vec = Op.getOperand(0);
SDValue Idx = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
// Store the value to a temporary stack slot, then LOAD the returned part.
SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr,
MachinePointerInfo(), false, false, 0);
// Add the offset to the index.
unsigned EltSize =
Vec.getValueType().getVectorElementType().getSizeInBits()/8;
Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
DAG.getConstant(EltSize, Idx.getValueType()));
if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
else
Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
StackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, StackPtr);
if (Op.getValueType().isVector())
return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr,MachinePointerInfo(),
false, false, 0);
return DAG.getExtLoad(ISD::EXTLOAD, dl, Op.getValueType(), Ch, StackPtr,
MachinePointerInfo(),
Vec.getValueType().getVectorElementType(),
false, false, 0);
}
SDValue SelectionDAGLegalize::ExpandInsertToVectorThroughStack(SDValue Op) {
assert(Op.getValueType().isVector() && "Non-vector insert subvector!");
SDValue Vec = Op.getOperand(0);
SDValue Part = Op.getOperand(1);
SDValue Idx = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
// Store the value to a temporary stack slot, then LOAD the returned part.
SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
int FI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
// First store the whole vector.
SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr, PtrInfo,
false, false, 0);
// Then store the inserted part.
// Add the offset to the index.
unsigned EltSize =
Vec.getValueType().getVectorElementType().getSizeInBits()/8;
Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
DAG.getConstant(EltSize, Idx.getValueType()));
if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
else
Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
SDValue SubStackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
StackPtr);
// Store the subvector.
Ch = DAG.getStore(DAG.getEntryNode(), dl, Part, SubStackPtr,
MachinePointerInfo(), false, false, 0);
// Finally, load the updated vector.
return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr, PtrInfo,
false, false, 0);
}
SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
// We can't handle this case efficiently. Allocate a sufficiently
// aligned object on the stack, store each element into it, then load
// the result as a vector.
// Create the stack frame object.
EVT VT = Node->getValueType(0);
EVT EltVT = VT.getVectorElementType();
DebugLoc dl = Node->getDebugLoc();
SDValue FIPtr = DAG.CreateStackTemporary(VT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
// Emit a store of each element to the stack slot.
SmallVector<SDValue, 8> Stores;
unsigned TypeByteSize = EltVT.getSizeInBits() / 8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
// Ignore undef elements.
if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
unsigned Offset = TypeByteSize*i;
SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
// If the destination vector element type is narrower than the source
// element type, only store the bits necessary.
if (EltVT.bitsLT(Node->getOperand(i).getValueType().getScalarType())) {
Stores.push_back(DAG.getTruncStore(DAG.getEntryNode(), dl,
Node->getOperand(i), Idx,
PtrInfo.getWithOffset(Offset),
EltVT, false, false, 0));
} else
Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl,
Node->getOperand(i), Idx,
PtrInfo.getWithOffset(Offset),
false, false, 0));
}
SDValue StoreChain;
if (!Stores.empty()) // Not all undef elements?
StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&Stores[0], Stores.size());
else
StoreChain = DAG.getEntryNode();
// Result is a load from the stack slot.
return DAG.getLoad(VT, dl, StoreChain, FIPtr, PtrInfo, false, false, 0);
}
SDValue SelectionDAGLegalize::ExpandFCOPYSIGN(SDNode* Node) {
DebugLoc dl = Node->getDebugLoc();
SDValue Tmp1 = Node->getOperand(0);
SDValue Tmp2 = Node->getOperand(1);
// Get the sign bit of the RHS. First obtain a value that has the same
// sign as the sign bit, i.e. negative if and only if the sign bit is 1.
SDValue SignBit;
EVT FloatVT = Tmp2.getValueType();
EVT IVT = EVT::getIntegerVT(*DAG.getContext(), FloatVT.getSizeInBits());
if (TLI.isTypeLegal(IVT)) {
// Convert to an integer with the same sign bit.
SignBit = DAG.getNode(ISD::BITCAST, dl, IVT, Tmp2);
} else {
// Store the float to memory, then load the sign part out as an integer.
MVT LoadTy = TLI.getPointerTy();
// First create a temporary that is aligned for both the load and store.
SDValue StackPtr = DAG.CreateStackTemporary(FloatVT, LoadTy);
// Then store the float to it.
SDValue Ch =
DAG.getStore(DAG.getEntryNode(), dl, Tmp2, StackPtr, MachinePointerInfo(),
false, false, 0);
if (TLI.isBigEndian()) {
assert(FloatVT.isByteSized() && "Unsupported floating point type!");
// Load out a legal integer with the same sign bit as the float.
SignBit = DAG.getLoad(LoadTy, dl, Ch, StackPtr, MachinePointerInfo(),
false, false, 0);
} else { // Little endian
SDValue LoadPtr = StackPtr;
// The float may be wider than the integer we are going to load. Advance
// the pointer so that the loaded integer will contain the sign bit.
unsigned Strides = (FloatVT.getSizeInBits()-1)/LoadTy.getSizeInBits();
unsigned ByteOffset = (Strides * LoadTy.getSizeInBits()) / 8;
LoadPtr = DAG.getNode(ISD::ADD, dl, LoadPtr.getValueType(),
LoadPtr, DAG.getIntPtrConstant(ByteOffset));
// Load a legal integer containing the sign bit.
SignBit = DAG.getLoad(LoadTy, dl, Ch, LoadPtr, MachinePointerInfo(),
false, false, 0);
// Move the sign bit to the top bit of the loaded integer.
unsigned BitShift = LoadTy.getSizeInBits() -
(FloatVT.getSizeInBits() - 8 * ByteOffset);
assert(BitShift < LoadTy.getSizeInBits() && "Pointer advanced wrong?");
if (BitShift)
SignBit = DAG.getNode(ISD::SHL, dl, LoadTy, SignBit,
DAG.getConstant(BitShift,
TLI.getShiftAmountTy(SignBit.getValueType())));
}
}
// Now get the sign bit proper, by seeing whether the value is negative.
SignBit = DAG.getSetCC(dl, TLI.getSetCCResultType(SignBit.getValueType()),
SignBit, DAG.getConstant(0, SignBit.getValueType()),
ISD::SETLT);
// Get the absolute value of the result.
SDValue AbsVal = DAG.getNode(ISD::FABS, dl, Tmp1.getValueType(), Tmp1);
// Select between the nabs and abs value based on the sign bit of
// the input.
return DAG.getNode(ISD::SELECT, dl, AbsVal.getValueType(), SignBit,
DAG.getNode(ISD::FNEG, dl, AbsVal.getValueType(), AbsVal),
AbsVal);
}
void SelectionDAGLegalize::ExpandDYNAMIC_STACKALLOC(SDNode* Node,
SmallVectorImpl<SDValue> &Results) {
unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and"
" not tell us which reg is the stack pointer!");
DebugLoc dl = Node->getDebugLoc();
EVT VT = Node->getValueType(0);
SDValue Tmp1 = SDValue(Node, 0);
SDValue Tmp2 = SDValue(Node, 1);
SDValue Tmp3 = Node->getOperand(2);
SDValue Chain = Tmp1.getOperand(0);
// Chain the dynamic stack allocation so that it doesn't modify the stack
// pointer when other instructions are using the stack.
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
SDValue Size = Tmp2.getOperand(1);
SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
Chain = SP.getValue(1);
unsigned Align = cast<ConstantSDNode>(Tmp3)->getZExtValue();
unsigned StackAlign = TM.getFrameLowering()->getStackAlignment();
if (Align > StackAlign)
SP = DAG.getNode(ISD::AND, dl, VT, SP,
DAG.getConstant(-(uint64_t)Align, VT));
Tmp1 = DAG.getNode(ISD::SUB, dl, VT, SP, Size); // Value
Chain = DAG.getCopyToReg(Chain, dl, SPReg, Tmp1); // Output chain
Tmp2 = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
DAG.getIntPtrConstant(0, true), SDValue());
Results.push_back(Tmp1);
Results.push_back(Tmp2);
}
/// LegalizeSetCCCondCode - Legalize a SETCC with given LHS and RHS and
/// condition code CC on the current target. This routine expands SETCC with
/// illegal condition code into AND / OR of multiple SETCC values.
void SelectionDAGLegalize::LegalizeSetCCCondCode(EVT VT,
SDValue &LHS, SDValue &RHS,
SDValue &CC,
DebugLoc dl) {
EVT OpVT = LHS.getValueType();
ISD::CondCode CCCode = cast<CondCodeSDNode>(CC)->get();
switch (TLI.getCondCodeAction(CCCode, OpVT)) {
default: assert(0 && "Unknown condition code action!");
case TargetLowering::Legal:
// Nothing to do.
break;
case TargetLowering::Expand: {
ISD::CondCode CC1 = ISD::SETCC_INVALID, CC2 = ISD::SETCC_INVALID;
unsigned Opc = 0;
switch (CCCode) {
default: assert(0 && "Don't know how to expand this condition!");
case ISD::SETOEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETOGT: CC1 = ISD::SETGT; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETOGE: CC1 = ISD::SETGE; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETOLT: CC1 = ISD::SETLT; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETOLE: CC1 = ISD::SETLE; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETONE: CC1 = ISD::SETNE; CC2 = ISD::SETO; Opc = ISD::AND; break;
case ISD::SETUEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETUO; Opc = ISD::OR; break;
case ISD::SETUGT: CC1 = ISD::SETGT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
case ISD::SETUGE: CC1 = ISD::SETGE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
case ISD::SETULT: CC1 = ISD::SETLT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
case ISD::SETULE: CC1 = ISD::SETLE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
case ISD::SETUNE: CC1 = ISD::SETNE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
// FIXME: Implement more expansions.
}
SDValue SetCC1 = DAG.getSetCC(dl, VT, LHS, RHS, CC1);
SDValue SetCC2 = DAG.getSetCC(dl, VT, LHS, RHS, CC2);
LHS = DAG.getNode(Opc, dl, VT, SetCC1, SetCC2);
RHS = SDValue();
CC = SDValue();
break;
}
}
}
/// EmitStackConvert - Emit a store/load combination to the stack. This stores
/// SrcOp to a stack slot of type SlotVT, truncating it if needed. It then does
/// a load from the stack slot to DestVT, extending it if needed.
/// The resultant code need not be legal.
SDValue SelectionDAGLegalize::EmitStackConvert(SDValue SrcOp,
EVT SlotVT,
EVT DestVT,
DebugLoc dl) {
// Create the stack frame object.
unsigned SrcAlign =
TLI.getTargetData()->getPrefTypeAlignment(SrcOp.getValueType().
getTypeForEVT(*DAG.getContext()));
SDValue FIPtr = DAG.CreateStackTemporary(SlotVT, SrcAlign);
FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(FIPtr);
int SPFI = StackPtrFI->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(SPFI);
unsigned SrcSize = SrcOp.getValueType().getSizeInBits();
unsigned SlotSize = SlotVT.getSizeInBits();
unsigned DestSize = DestVT.getSizeInBits();
Type *DestType = DestVT.getTypeForEVT(*DAG.getContext());
unsigned DestAlign = TLI.getTargetData()->getPrefTypeAlignment(DestType);
// Emit a store to the stack slot. Use a truncstore if the input value is
// later than DestVT.
SDValue Store;
if (SrcSize > SlotSize)
Store = DAG.getTruncStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
PtrInfo, SlotVT, false, false, SrcAlign);
else {
assert(SrcSize == SlotSize && "Invalid store");
Store = DAG.getStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
PtrInfo, false, false, SrcAlign);
}
// Result is a load from the stack slot.
if (SlotSize == DestSize)
return DAG.getLoad(DestVT, dl, Store, FIPtr, PtrInfo,
false, false, DestAlign);
assert(SlotSize < DestSize && "Unknown extension!");
return DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT, Store, FIPtr,
PtrInfo, SlotVT, false, false, DestAlign);
}
SDValue SelectionDAGLegalize::ExpandSCALAR_TO_VECTOR(SDNode *Node) {
DebugLoc dl = Node->getDebugLoc();
// Create a vector sized/aligned stack slot, store the value to element #0,
// then load the whole vector back out.
SDValue StackPtr = DAG.CreateStackTemporary(Node->getValueType(0));
FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(StackPtr);
int SPFI = StackPtrFI->getIndex();
SDValue Ch = DAG.getTruncStore(DAG.getEntryNode(), dl, Node->getOperand(0),
StackPtr,
MachinePointerInfo::getFixedStack(SPFI),
Node->getValueType(0).getVectorElementType(),
false, false, 0);
return DAG.getLoad(Node->getValueType(0), dl, Ch, StackPtr,
MachinePointerInfo::getFixedStack(SPFI),
false, false, 0);
}
/// ExpandBUILD_VECTOR - Expand a BUILD_VECTOR node on targets that don't
/// support the operation, but do support the resultant vector type.
SDValue SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
unsigned NumElems = Node->getNumOperands();
SDValue Value1, Value2;
DebugLoc dl = Node->getDebugLoc();
EVT VT = Node->getValueType(0);
EVT OpVT = Node->getOperand(0).getValueType();
EVT EltVT = VT.getVectorElementType();
// If the only non-undef value is the low element, turn this into a
// SCALAR_TO_VECTOR node. If this is { X, X, X, X }, determine X.
bool isOnlyLowElement = true;
bool MoreThanTwoValues = false;
bool isConstant = true;
for (unsigned i = 0; i < NumElems; ++i) {
SDValue V = Node->getOperand(i);
if (V.getOpcode() == ISD::UNDEF)
continue;
if (i > 0)
isOnlyLowElement = false;
if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
isConstant = false;
if (!Value1.getNode()) {
Value1 = V;
} else if (!Value2.getNode()) {
if (V != Value1)
Value2 = V;
} else if (V != Value1 && V != Value2) {
MoreThanTwoValues = true;
}
}
if (!Value1.getNode())
return DAG.getUNDEF(VT);
if (isOnlyLowElement)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Node->getOperand(0));
// If all elements are constants, create a load from the constant pool.
if (isConstant) {
std::vector<Constant*> CV;
for (unsigned i = 0, e = NumElems; i != e; ++i) {
if (ConstantFPSDNode *V =
dyn_cast<ConstantFPSDNode>(Node->getOperand(i))) {
CV.push_back(const_cast<ConstantFP *>(V->getConstantFPValue()));
} else if (ConstantSDNode *V =
dyn_cast<ConstantSDNode>(Node->getOperand(i))) {
if (OpVT==EltVT)
CV.push_back(const_cast<ConstantInt *>(V->getConstantIntValue()));
else {
// If OpVT and EltVT don't match, EltVT is not legal and the
// element values have been promoted/truncated earlier. Undo this;
// we don't want a v16i8 to become a v16i32 for example.
const ConstantInt *CI = V->getConstantIntValue();
CV.push_back(ConstantInt::get(EltVT.getTypeForEVT(*DAG.getContext()),
CI->getZExtValue()));
}
} else {
assert(Node->getOperand(i).getOpcode() == ISD::UNDEF);
Type *OpNTy = EltVT.getTypeForEVT(*DAG.getContext());
CV.push_back(UndefValue::get(OpNTy));
}
}
Constant *CP = ConstantVector::get(CV);
SDValue CPIdx = DAG.getConstantPool(CP, TLI.getPointerTy());
unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
return DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, Alignment);
}
if (!MoreThanTwoValues) {
SmallVector<int, 8> ShuffleVec(NumElems, -1);
for (unsigned i = 0; i < NumElems; ++i) {
SDValue V = Node->getOperand(i);
if (V.getOpcode() == ISD::UNDEF)
continue;
ShuffleVec[i] = V == Value1 ? 0 : NumElems;
}
if (TLI.isShuffleMaskLegal(ShuffleVec, Node->getValueType(0))) {
// Get the splatted value into the low element of a vector register.
SDValue Vec1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value1);
SDValue Vec2;
if (Value2.getNode())
Vec2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value2);
else
Vec2 = DAG.getUNDEF(VT);
// Return shuffle(LowValVec, undef, <0,0,0,0>)
return DAG.getVectorShuffle(VT, dl, Vec1, Vec2, ShuffleVec.data());
}
}
// Otherwise, we can't handle this case efficiently.
return ExpandVectorBuildThroughStack(Node);
}
// ExpandLibCall - Expand a node into a call to a libcall. If the result value
// does not fit into a register, return the lo part and set the hi part to the
// by-reg argument. If it does fit into a single register, return the result
// and leave the Hi part unset.
SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node,
bool isSigned) {
assert(!IsLegalizingCall && "Cannot overlap legalization of calls!");
// The input chain to this libcall is the entry node of the function.
// Legalizing the call will automatically add the previous call to the
// dependence.
SDValue InChain = DAG.getEntryNode();
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
EVT ArgVT = Node->getOperand(i).getValueType();
Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
Entry.isSExt = isSigned;
Entry.isZExt = !isSigned;
Args.push_back(Entry);
}
SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
TLI.getPointerTy());
// Splice the libcall in wherever FindInputOutputChains tells us to.
Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
// isTailCall may be true since the callee does not reference caller stack
// frame. Check if it's in the right position.
bool isTailCall = isInTailCallPosition(DAG, Node, TLI);
std::pair<SDValue, SDValue> CallInfo =
TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
0, TLI.getLibcallCallingConv(LC), isTailCall,
/*isReturnValueUsed=*/true,
Callee, Args, DAG, Node->getDebugLoc());
if (!CallInfo.second.getNode())
// It's a tailcall, return the chain (which is the DAG root).
return DAG.getRoot();
// Legalize the call sequence, starting with the chain. This will advance
// the LastCALLSEQ_END to the legalized version of the CALLSEQ_END node that
// was added by LowerCallTo (guaranteeing proper serialization of calls).
LegalizeOp(CallInfo.second);
return CallInfo.first;
}
/// ExpandLibCall - Generate a libcall taking the given operands as arguments
/// and returning a result of type RetVT.
SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, EVT RetVT,
const SDValue *Ops, unsigned NumOps,
bool isSigned, DebugLoc dl) {
TargetLowering::ArgListTy Args;
Args.reserve(NumOps);
TargetLowering::ArgListEntry Entry;
for (unsigned i = 0; i != NumOps; ++i) {
Entry.Node = Ops[i];
Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
Entry.isSExt = isSigned;
Entry.isZExt = !isSigned;
Args.push_back(Entry);
}
SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
TLI.getPointerTy());
Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
std::pair<SDValue,SDValue> CallInfo =
TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
false, 0, TLI.getLibcallCallingConv(LC), false,
/*isReturnValueUsed=*/true,
Callee, Args, DAG, dl);
// Legalize the call sequence, starting with the chain. This will advance
// the LastCALLSEQ_END to the legalized version of the CALLSEQ_END node that
// was added by LowerCallTo (guaranteeing proper serialization of calls).
LegalizeOp(CallInfo.second);
return CallInfo.first;
}
// ExpandChainLibCall - Expand a node into a call to a libcall. Similar to
// ExpandLibCall except that the first operand is the in-chain.
std::pair<SDValue, SDValue>
SelectionDAGLegalize::ExpandChainLibCall(RTLIB::Libcall LC,
SDNode *Node,
bool isSigned) {
assert(!IsLegalizingCall && "Cannot overlap legalization of calls!");
SDValue InChain = Node->getOperand(0);
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i) {
EVT ArgVT = Node->getOperand(i).getValueType();
Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
Entry.Node = Node->getOperand(i);
Entry.Ty = ArgTy;
Entry.isSExt = isSigned;
Entry.isZExt = !isSigned;
Args.push_back(Entry);
}
SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
TLI.getPointerTy());
// Splice the libcall in wherever FindInputOutputChains tells us to.
Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
std::pair<SDValue, SDValue> CallInfo =
TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
/*isReturnValueUsed=*/true,
Callee, Args, DAG, Node->getDebugLoc());
// Legalize the call sequence, starting with the chain. This will advance
// the LastCALLSEQ_END to the legalized version of the CALLSEQ_END node that
// was added by LowerCallTo (guaranteeing proper serialization of calls).
LegalizeOp(CallInfo.second);
return CallInfo;
}
SDValue SelectionDAGLegalize::ExpandFPLibCall(SDNode* Node,
RTLIB::Libcall Call_F32,
RTLIB::Libcall Call_F64,
RTLIB::Libcall Call_F80,
RTLIB::Libcall Call_PPCF128) {
RTLIB::Libcall LC;
switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
default: assert(0 && "Unexpected request for libcall!");
case MVT::f32: LC = Call_F32; break;
case MVT::f64: LC = Call_F64; break;
case MVT::f80: LC = Call_F80; break;
case MVT::ppcf128: LC = Call_PPCF128; break;
}
return ExpandLibCall(LC, Node, false);
}
SDValue SelectionDAGLegalize::ExpandIntLibCall(SDNode* Node, bool isSigned,
RTLIB::Libcall Call_I8,
RTLIB::Libcall Call_I16,
RTLIB::Libcall Call_I32,
RTLIB::Libcall Call_I64,
RTLIB::Libcall Call_I128) {
RTLIB::Libcall LC;
switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
default: assert(0 && "Unexpected request for libcall!");
case MVT::i8: LC = Call_I8; break;
case MVT::i16: LC = Call_I16; break;
case MVT::i32: LC = Call_I32; break;
case MVT::i64: LC = Call_I64; break;
case MVT::i128: LC = Call_I128; break;
}
return ExpandLibCall(LC, Node, isSigned);
}
/// isDivRemLibcallAvailable - Return true if divmod libcall is available.
static bool isDivRemLibcallAvailable(SDNode *Node, bool isSigned,
const TargetLowering &TLI) {
RTLIB::Libcall LC;
switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
default: assert(0 && "Unexpected request for libcall!");
case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
}
return TLI.getLibcallName(LC) != 0;
}
/// UseDivRem - Only issue divrem libcall if both quotient and remainder are
/// needed.
static bool UseDivRem(SDNode *Node, bool isSigned, bool isDIV) {
unsigned OtherOpcode = 0;
if (isSigned)
OtherOpcode = isDIV ? ISD::SREM : ISD::SDIV;
else
OtherOpcode = isDIV ? ISD::UREM : ISD::UDIV;
SDValue Op0 = Node->getOperand(0);
SDValue Op1 = Node->getOperand(1);
for (SDNode::use_iterator UI = Op0.getNode()->use_begin(),
UE = Op0.getNode()->use_end(); UI != UE; ++UI) {
SDNode *User = *UI;
if (User == Node)
continue;
if (User->getOpcode() == OtherOpcode &&
User->getOperand(0) == Op0 &&
User->getOperand(1) == Op1)
return true;
}
return false;
}
/// ExpandDivRemLibCall - Issue libcalls to __{u}divmod to compute div / rem
/// pairs.
void
SelectionDAGLegalize::ExpandDivRemLibCall(SDNode *Node,
SmallVectorImpl<SDValue> &Results) {
unsigned Opcode = Node->getOpcode();
bool isSigned = Opcode == ISD::SDIVREM;
RTLIB::Libcall LC;
switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
default: assert(0 && "Unexpected request for libcall!");
case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
}
// The input chain to this libcall is the entry node of the function.
// Legalizing the call will automatically add the previous call to the
// dependence.
SDValue InChain = DAG.getEntryNode();
EVT RetVT = Node->getValueType(0);
Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
EVT ArgVT = Node->getOperand(i).getValueType();
Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
Entry.isSExt = isSigned;
Entry.isZExt = !isSigned;
Args.push_back(Entry);
}
// Also pass the return address of the remainder.
SDValue FIPtr = DAG.CreateStackTemporary(RetVT);
Entry.Node = FIPtr;
Entry.Ty = RetTy->getPointerTo();
Entry.isSExt = isSigned;
Entry.isZExt = !isSigned;
Args.push_back(Entry);
SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
TLI.getPointerTy());
// Splice the libcall in wherever FindInputOutputChains tells us to.
DebugLoc dl = Node->getDebugLoc();
std::pair<SDValue, SDValue> CallInfo =
TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
/*isReturnValueUsed=*/true, Callee, Args, DAG, dl);
// Legalize the call sequence, starting with the chain. This will advance
// the LastCALLSEQ to the legalized version of the CALLSEQ_END node that
// was added by LowerCallTo (guaranteeing proper serialization of calls).
LegalizeOp(CallInfo.second);
// Remainder is loaded back from the stack frame.
SDValue Rem = DAG.getLoad(RetVT, dl, LastCALLSEQ_END, FIPtr,
MachinePointerInfo(), false, false, 0);
Results.push_back(CallInfo.first);
Results.push_back(Rem);
}
/// ExpandLegalINT_TO_FP - This function is responsible for legalizing a
/// INT_TO_FP operation of the specified operand when the target requests that
/// we expand it. At this point, we know that the result and operand types are
/// legal for the target.
SDValue SelectionDAGLegalize::ExpandLegalINT_TO_FP(bool isSigned,
SDValue Op0,
EVT DestVT,
DebugLoc dl) {
if (Op0.getValueType() == MVT::i32) {
// simple 32-bit [signed|unsigned] integer to float/double expansion
// Get the stack frame index of a 8 byte buffer.
SDValue StackSlot = DAG.CreateStackTemporary(MVT::f64);
// word offset constant for Hi/Lo address computation
SDValue WordOff = DAG.getConstant(sizeof(int), TLI.getPointerTy());
// set up Hi and Lo (into buffer) address based on endian
SDValue Hi = StackSlot;
SDValue Lo = DAG.getNode(ISD::ADD, dl,
TLI.getPointerTy(), StackSlot, WordOff);
if (TLI.isLittleEndian())
std::swap(Hi, Lo);
// if signed map to unsigned space
SDValue Op0Mapped;
if (isSigned) {
// constant used to invert sign bit (signed to unsigned mapping)
SDValue SignBit = DAG.getConstant(0x80000000u, MVT::i32);
Op0Mapped = DAG.getNode(ISD::XOR, dl, MVT::i32, Op0, SignBit);
} else {
Op0Mapped = Op0;
}
// store the lo of the constructed double - based on integer input
SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl,
Op0Mapped, Lo, MachinePointerInfo(),
false, false, 0);
// initial hi portion of constructed double
SDValue InitialHi = DAG.getConstant(0x43300000u, MVT::i32);
// store the hi of the constructed double - biased exponent
SDValue Store2 = DAG.getStore(Store1, dl, InitialHi, Hi,
MachinePointerInfo(),
false, false, 0);
// load the constructed double
SDValue Load = DAG.getLoad(MVT::f64, dl, Store2, StackSlot,
MachinePointerInfo(), false, false, 0);
// FP constant to bias correct the final result
SDValue Bias = DAG.getConstantFP(isSigned ?
BitsToDouble(0x4330000080000000ULL) :
BitsToDouble(0x4330000000000000ULL),
MVT::f64);
// subtract the bias
SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Load, Bias);
// final result
SDValue Result;
// handle final rounding
if (DestVT == MVT::f64) {
// do nothing
Result = Sub;
} else if (DestVT.bitsLT(MVT::f64)) {
Result = DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
DAG.getIntPtrConstant(0));
} else if (DestVT.bitsGT(MVT::f64)) {
Result = DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
}
return Result;
}
assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet");
// Code below here assumes !isSigned without checking again.
// Implementation of unsigned i64 to f64 following the algorithm in
// __floatundidf in compiler_rt. This implementation has the advantage
// of performing rounding correctly, both in the default rounding mode
// and in all alternate rounding modes.
// TODO: Generalize this for use with other types.
if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f64) {
SDValue TwoP52 =
DAG.getConstant(UINT64_C(0x4330000000000000), MVT::i64);
SDValue TwoP84PlusTwoP52 =
DAG.getConstantFP(BitsToDouble(UINT64_C(0x4530000000100000)), MVT::f64);
SDValue TwoP84 =
DAG.getConstant(UINT64_C(0x4530000000000000), MVT::i64);
SDValue Lo = DAG.getZeroExtendInReg(Op0, dl, MVT::i32);
SDValue Hi = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0,
DAG.getConstant(32, MVT::i64));
SDValue LoOr = DAG.getNode(ISD::OR, dl, MVT::i64, Lo, TwoP52);
SDValue HiOr = DAG.getNode(ISD::OR, dl, MVT::i64, Hi, TwoP84);
SDValue LoFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, LoOr);
SDValue HiFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, HiOr);
SDValue HiSub = DAG.getNode(ISD::FSUB, dl, MVT::f64, HiFlt,
TwoP84PlusTwoP52);
return DAG.getNode(ISD::FADD, dl, MVT::f64, LoFlt, HiSub);
}
// Implementation of unsigned i64 to f32.
// TODO: Generalize this for use with other types.
if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f32) {
// For unsigned conversions, convert them to signed conversions using the
// algorithm from the x86_64 __floatundidf in compiler_rt.
if (!isSigned) {
SDValue Fast = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Op0);
SDValue ShiftConst =
DAG.getConstant(1, TLI.getShiftAmountTy(Op0.getValueType()));
SDValue Shr = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0, ShiftConst);
SDValue AndConst = DAG.getConstant(1, MVT::i64);
SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0, AndConst);
SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And, Shr);
SDValue SignCvt = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Or);
SDValue Slow = DAG.getNode(ISD::FADD, dl, MVT::f32, SignCvt, SignCvt);
// TODO: This really should be implemented using a branch rather than a
// select. We happen to get lucky and machinesink does the right
// thing most of the time. This would be a good candidate for a
//pseudo-op, or, even better, for whole-function isel.
SDValue SignBitTest = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
Op0, DAG.getConstant(0, MVT::i64), ISD::SETLT);
return DAG.getNode(ISD::SELECT, dl, MVT::f32, SignBitTest, Slow, Fast);
}
// Otherwise, implement the fully general conversion.
SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
DAG.getConstant(UINT64_C(0xfffffffffffff800), MVT::i64));
SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And,
DAG.getConstant(UINT64_C(0x800), MVT::i64));
SDValue And2 = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
DAG.getConstant(UINT64_C(0x7ff), MVT::i64));
SDValue Ne = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
And2, DAG.getConstant(UINT64_C(0), MVT::i64), ISD::SETNE);
SDValue Sel = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ne, Or, Op0);
SDValue Ge = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
Op0, DAG.getConstant(UINT64_C(0x0020000000000000), MVT::i64),
ISD::SETUGE);
SDValue Sel2 = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ge, Sel, Op0);
EVT SHVT = TLI.getShiftAmountTy(Sel2.getValueType());
SDValue Sh = DAG.getNode(ISD::SRL, dl, MVT::i64, Sel2,
DAG.getConstant(32, SHVT));
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sh);
SDValue Fcvt = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Trunc);
SDValue TwoP32 =
DAG.getConstantFP(BitsToDouble(UINT64_C(0x41f0000000000000)), MVT::f64);
SDValue Fmul = DAG.getNode(ISD::FMUL, dl, MVT::f64, TwoP32, Fcvt);
SDValue Lo = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sel2);
SDValue Fcvt2 = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Lo);
SDValue Fadd = DAG.getNode(ISD::FADD, dl, MVT::f64, Fmul, Fcvt2);
return DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Fadd,
DAG.getIntPtrConstant(0));
}
SDValue Tmp1 = DAG.getNode(ISD::SINT_TO_FP, dl, DestVT, Op0);
SDValue SignSet = DAG.getSetCC(dl, TLI.getSetCCResultType(Op0.getValueType()),
Op0, DAG.getConstant(0, Op0.getValueType()),
ISD::SETLT);
SDValue Zero = DAG.getIntPtrConstant(0), Four = DAG.getIntPtrConstant(4);
SDValue CstOffset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(),
SignSet, Four, Zero);
// If the sign bit of the integer is set, the large number will be treated
// as a negative number. To counteract this, the dynamic code adds an
// offset depending on the data type.
uint64_t FF;
switch (Op0.getValueType().getSimpleVT().SimpleTy) {
default: assert(0 && "Unsupported integer type!");
case MVT::i8 : FF = 0x43800000ULL; break; // 2^8 (as a float)
case MVT::i16: FF = 0x47800000ULL; break; // 2^16 (as a float)
case MVT::i32: FF = 0x4F800000ULL; break; // 2^32 (as a float)
case MVT::i64: FF = 0x5F800000ULL; break; // 2^64 (as a float)
}
if (TLI.isLittleEndian()) FF <<= 32;
Constant *FudgeFactor = ConstantInt::get(
Type::getInt64Ty(*DAG.getContext()), FF);
SDValue CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
CPIdx = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), CPIdx, CstOffset);
Alignment = std::min(Alignment, 4u);
SDValue FudgeInReg;
if (DestVT == MVT::f32)
FudgeInReg = DAG.getLoad(MVT::f32, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, Alignment);
else {
FudgeInReg =
LegalizeOp(DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT,
DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
MVT::f32, false, false, Alignment));
}
return DAG.getNode(ISD::FADD, dl, DestVT, Tmp1, FudgeInReg);
}
/// PromoteLegalINT_TO_FP - This function is responsible for legalizing a
/// *INT_TO_FP operation of the specified operand when the target requests that
/// we promote it. At this point, we know that the result and operand types are
/// legal for the target, and that there is a legal UINT_TO_FP or SINT_TO_FP
/// operation that takes a larger input.
SDValue SelectionDAGLegalize::PromoteLegalINT_TO_FP(SDValue LegalOp,
EVT DestVT,
bool isSigned,
DebugLoc dl) {
// First step, figure out the appropriate *INT_TO_FP operation to use.
EVT NewInTy = LegalOp.getValueType();
unsigned OpToUse = 0;
// Scan for the appropriate larger type to use.
while (1) {
NewInTy = (MVT::SimpleValueType)(NewInTy.getSimpleVT().SimpleTy+1);
assert(NewInTy.isInteger() && "Ran out of possibilities!");
// If the target supports SINT_TO_FP of this type, use it.
if (TLI.isOperationLegalOrCustom(ISD::SINT_TO_FP, NewInTy)) {
OpToUse = ISD::SINT_TO_FP;
break;
}
if (isSigned) continue;
// If the target supports UINT_TO_FP of this type, use it.
if (TLI.isOperationLegalOrCustom(ISD::UINT_TO_FP, NewInTy)) {
OpToUse = ISD::UINT_TO_FP;
break;
}
// Otherwise, try a larger type.
}
// Okay, we found the operation and type to use. Zero extend our input to the
// desired type then run the operation on it.
return DAG.getNode(OpToUse, dl, DestVT,
DAG.getNode(isSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND,
dl, NewInTy, LegalOp));
}
/// PromoteLegalFP_TO_INT - This function is responsible for legalizing a
/// FP_TO_*INT operation of the specified operand when the target requests that
/// we promote it. At this point, we know that the result and operand types are
/// legal for the target, and that there is a legal FP_TO_UINT or FP_TO_SINT
/// operation that returns a larger result.
SDValue SelectionDAGLegalize::PromoteLegalFP_TO_INT(SDValue LegalOp,
EVT DestVT,
bool isSigned,
DebugLoc dl) {
// First step, figure out the appropriate FP_TO*INT operation to use.
EVT NewOutTy = DestVT;
unsigned OpToUse = 0;
// Scan for the appropriate larger type to use.
while (1) {
NewOutTy = (MVT::SimpleValueType)(NewOutTy.getSimpleVT().SimpleTy+1);
assert(NewOutTy.isInteger() && "Ran out of possibilities!");
if (TLI.isOperationLegalOrCustom(ISD::FP_TO_SINT, NewOutTy)) {
OpToUse = ISD::FP_TO_SINT;
break;
}
if (TLI.isOperationLegalOrCustom(ISD::FP_TO_UINT, NewOutTy)) {
OpToUse = ISD::FP_TO_UINT;
break;
}
// Otherwise, try a larger type.
}
// Okay, we found the operation and type to use.
SDValue Operation = DAG.getNode(OpToUse, dl, NewOutTy, LegalOp);
// Truncate the result of the extended FP_TO_*INT operation to the desired
// size.
return DAG.getNode(ISD::TRUNCATE, dl, DestVT, Operation);
}
/// ExpandBSWAP - Open code the operations for BSWAP of the specified operation.
///
SDValue SelectionDAGLegalize::ExpandBSWAP(SDValue Op, DebugLoc dl) {
EVT VT = Op.getValueType();
EVT SHVT = TLI.getShiftAmountTy(VT);
SDValue Tmp1, Tmp2, Tmp3, Tmp4, Tmp5, Tmp6, Tmp7, Tmp8;
switch (VT.getSimpleVT().SimpleTy) {
default: assert(0 && "Unhandled Expand type in BSWAP!");
case MVT::i16:
Tmp2 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
return DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
case MVT::i32:
Tmp4 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
Tmp3 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(0xFF0000, VT));
Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(0xFF00, VT));
Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
return DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
case MVT::i64:
Tmp8 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(56, SHVT));
Tmp7 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(40, SHVT));
Tmp6 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
Tmp5 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
Tmp4 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
Tmp3 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(40, SHVT));
Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(56, SHVT));
Tmp7 = DAG.getNode(ISD::AND, dl, VT, Tmp7, DAG.getConstant(255ULL<<48, VT));
Tmp6 = DAG.getNode(ISD::AND, dl, VT, Tmp6, DAG.getConstant(255ULL<<40, VT));
Tmp5 = DAG.getNode(ISD::AND, dl, VT, Tmp5, DAG.getConstant(255ULL<<32, VT));
Tmp4 = DAG.getNode(ISD::AND, dl, VT, Tmp4, DAG.getConstant(255ULL<<24, VT));
Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(255ULL<<16, VT));
Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(255ULL<<8 , VT));
Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp7);
Tmp6 = DAG.getNode(ISD::OR, dl, VT, Tmp6, Tmp5);
Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp6);
Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
return DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp4);
}
}
/// SplatByte - Distribute ByteVal over NumBits bits.
// FIXME: Move this helper to a common place.
static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
APInt Val = APInt(NumBits, ByteVal);
unsigned Shift = 8;
for (unsigned i = NumBits; i > 8; i >>= 1) {
Val = (Val << Shift) | Val;
Shift <<= 1;
}
return Val;
}
/// ExpandBitCount - Expand the specified bitcount instruction into operations.
///
SDValue SelectionDAGLegalize::ExpandBitCount(unsigned Opc, SDValue Op,
DebugLoc dl) {
switch (Opc) {
default: assert(0 && "Cannot expand this yet!");
case ISD::CTPOP: {
EVT VT = Op.getValueType();
EVT ShVT = TLI.getShiftAmountTy(VT);
unsigned Len = VT.getSizeInBits();
assert(VT.isInteger() && Len <= 128 && Len % 8 == 0 &&
"CTPOP not implemented for this type.");
// This is the "best" algorithm from
// http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
SDValue Mask55 = DAG.getConstant(SplatByte(Len, 0x55), VT);
SDValue Mask33 = DAG.getConstant(SplatByte(Len, 0x33), VT);
SDValue Mask0F = DAG.getConstant(SplatByte(Len, 0x0F), VT);
SDValue Mask01 = DAG.getConstant(SplatByte(Len, 0x01), VT);
// v = v - ((v >> 1) & 0x55555555...)
Op = DAG.getNode(ISD::SUB, dl, VT, Op,
DAG.getNode(ISD::AND, dl, VT,
DAG.getNode(ISD::SRL, dl, VT, Op,
DAG.getConstant(1, ShVT)),
Mask55));
// v = (v & 0x33333333...) + ((v >> 2) & 0x33333333...)
Op = DAG.getNode(ISD::ADD, dl, VT,
DAG.getNode(ISD::AND, dl, VT, Op, Mask33),
DAG.getNode(ISD::AND, dl, VT,
DAG.getNode(ISD::SRL, dl, VT, Op,
DAG.getConstant(2, ShVT)),
Mask33));
// v = (v + (v >> 4)) & 0x0F0F0F0F...
Op = DAG.getNode(ISD::AND, dl, VT,
DAG.getNode(ISD::ADD, dl, VT, Op,
DAG.getNode(ISD::SRL, dl, VT, Op,
DAG.getConstant(4, ShVT))),
Mask0F);
// v = (v * 0x01010101...) >> (Len - 8)
Op = DAG.getNode(ISD::SRL, dl, VT,
DAG.getNode(ISD::MUL, dl, VT, Op, Mask01),
DAG.getConstant(Len - 8, ShVT));
return Op;
}
case ISD::CTLZ: {
// for now, we do this:
// x = x | (x >> 1);
// x = x | (x >> 2);
// ...
// x = x | (x >>16);
// x = x | (x >>32); // for 64-bit input
// return popcount(~x);
//
// but see also: http://www.hackersdelight.org/HDcode/nlz.cc
EVT VT = Op.getValueType();
EVT ShVT = TLI.getShiftAmountTy(VT);
unsigned len = VT.getSizeInBits();
for (unsigned i = 0; (1U << i) <= (len / 2); ++i) {
SDValue Tmp3 = DAG.getConstant(1ULL << i, ShVT);
Op = DAG.getNode(ISD::OR, dl, VT, Op,
DAG.getNode(ISD::SRL, dl, VT, Op, Tmp3));
}
Op = DAG.getNOT(dl, Op, VT);
return DAG.getNode(ISD::CTPOP, dl, VT, Op);
}
case ISD::CTTZ: {
// for now, we use: { return popcount(~x & (x - 1)); }
// unless the target has ctlz but not ctpop, in which case we use:
// { return 32 - nlz(~x & (x-1)); }
// see also http://www.hackersdelight.org/HDcode/ntz.cc
EVT VT = Op.getValueType();
SDValue Tmp3 = DAG.getNode(ISD::AND, dl, VT,
DAG.getNOT(dl, Op, VT),
DAG.getNode(ISD::SUB, dl, VT, Op,
DAG.getConstant(1, VT)));
// If ISD::CTLZ is legal and CTPOP isn't, then do that instead.
if (!TLI.isOperationLegalOrCustom(ISD::CTPOP, VT) &&
TLI.isOperationLegalOrCustom(ISD::CTLZ, VT))
return DAG.getNode(ISD::SUB, dl, VT,
DAG.getConstant(VT.getSizeInBits(), VT),
DAG.getNode(ISD::CTLZ, dl, VT, Tmp3));
return DAG.getNode(ISD::CTPOP, dl, VT, Tmp3);
}
}
}
std::pair <SDValue, SDValue> SelectionDAGLegalize::ExpandAtomic(SDNode *Node) {
unsigned Opc = Node->getOpcode();
MVT VT = cast<AtomicSDNode>(Node)->getMemoryVT().getSimpleVT();
RTLIB::Libcall LC;
switch (Opc) {
default:
llvm_unreachable("Unhandled atomic intrinsic Expand!");
break;
case ISD::ATOMIC_SWAP:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_1; break;
case MVT::i16: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_2; break;
case MVT::i32: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_4; break;
case MVT::i64: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_8; break;
}
break;
case ISD::ATOMIC_CMP_SWAP:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_1; break;
case MVT::i16: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_2; break;
case MVT::i32: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_4; break;
case MVT::i64: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_8; break;
}
break;
case ISD::ATOMIC_LOAD_ADD:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_ADD_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_ADD_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_ADD_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_ADD_8; break;
}
break;
case ISD::ATOMIC_LOAD_SUB:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_SUB_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_SUB_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_SUB_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_SUB_8; break;
}
break;
case ISD::ATOMIC_LOAD_AND:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_AND_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_AND_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_AND_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_AND_8; break;
}
break;
case ISD::ATOMIC_LOAD_OR:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_OR_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_OR_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_OR_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_OR_8; break;
}
break;
case ISD::ATOMIC_LOAD_XOR:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_XOR_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_XOR_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_XOR_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_XOR_8; break;
}
break;
case ISD::ATOMIC_LOAD_NAND:
switch (VT.SimpleTy) {
default: llvm_unreachable("Unexpected value type for atomic!");
case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_NAND_1; break;
case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_NAND_2; break;
case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_NAND_4; break;
case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_NAND_8; break;
}
break;
}
return ExpandChainLibCall(LC, Node, false);
}
void SelectionDAGLegalize::ExpandNode(SDNode *Node,
SmallVectorImpl<SDValue> &Results) {
DebugLoc dl = Node->getDebugLoc();
SDValue Tmp1, Tmp2, Tmp3, Tmp4;
switch (Node->getOpcode()) {
case ISD::CTPOP:
case ISD::CTLZ:
case ISD::CTTZ:
Tmp1 = ExpandBitCount(Node->getOpcode(), Node->getOperand(0), dl);
Results.push_back(Tmp1);
break;
case ISD::BSWAP:
Results.push_back(ExpandBSWAP(Node->getOperand(0), dl));
break;
case ISD::FRAMEADDR:
case ISD::RETURNADDR:
case ISD::FRAME_TO_ARGS_OFFSET:
Results.push_back(DAG.getConstant(0, Node->getValueType(0)));
break;
case ISD::FLT_ROUNDS_:
Results.push_back(DAG.getConstant(1, Node->getValueType(0)));
break;
case ISD::EH_RETURN:
case ISD::EH_LABEL:
case ISD::PREFETCH:
case ISD::VAEND:
case ISD::EH_SJLJ_LONGJMP:
case ISD::EH_SJLJ_DISPATCHSETUP:
// If the target didn't expand these, there's nothing to do, so just
// preserve the chain and be done.
Results.push_back(Node->getOperand(0));
break;
case ISD::EH_SJLJ_SETJMP:
// If the target didn't expand this, just return 'zero' and preserve the
// chain.
Results.push_back(DAG.getConstant(0, MVT::i32));
Results.push_back(Node->getOperand(0));
break;
case ISD::ATOMIC_FENCE:
case ISD::MEMBARRIER: {
// If the target didn't lower this, lower it to '__sync_synchronize()' call
// FIXME: handle "fence singlethread" more efficiently.
TargetLowering::ArgListTy Args;
std::pair<SDValue, SDValue> CallResult =
TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
false, false, false, false, 0, CallingConv::C,
/*isTailCall=*/false,
/*isReturnValueUsed=*/true,
DAG.getExternalSymbol("__sync_synchronize",
TLI.getPointerTy()),
Args, DAG, dl);
Results.push_back(CallResult.second);
break;
}
case ISD::ATOMIC_LOAD: {
// There is no libcall for atomic load; fake it with ATOMIC_CMP_SWAP.
SDValue Zero = DAG.getConstant(0, cast<AtomicSDNode>(Node)->getMemoryVT());
SDValue Swap = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl,
cast<AtomicSDNode>(Node)->getMemoryVT(),
Node->getOperand(0),
Node->getOperand(1), Zero, Zero,
cast<AtomicSDNode>(Node)->getMemOperand(),
cast<AtomicSDNode>(Node)->getOrdering(),
cast<AtomicSDNode>(Node)->getSynchScope());
Results.push_back(Swap.getValue(0));
Results.push_back(Swap.getValue(1));
break;
}
case ISD::ATOMIC_STORE: {
// There is no libcall for atomic store; fake it with ATOMIC_SWAP.
SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
cast<AtomicSDNode>(Node)->getMemoryVT(),
Node->getOperand(0),
Node->getOperand(1), Node->getOperand(2),
cast<AtomicSDNode>(Node)->getMemOperand(),
cast<AtomicSDNode>(Node)->getOrdering(),
cast<AtomicSDNode>(Node)->getSynchScope());
Results.push_back(Swap.getValue(1));
break;
}
// By default, atomic intrinsics are marked Legal and lowered. Targets
// which don't support them directly, however, may want libcalls, in which
// case they mark them Expand, and we get here.
case ISD::ATOMIC_SWAP:
case ISD::ATOMIC_LOAD_ADD:
case ISD::ATOMIC_LOAD_SUB:
case ISD::ATOMIC_LOAD_AND:
case ISD::ATOMIC_LOAD_OR:
case ISD::ATOMIC_LOAD_XOR:
case ISD::ATOMIC_LOAD_NAND:
case ISD::ATOMIC_LOAD_MIN:
case ISD::ATOMIC_LOAD_MAX:
case ISD::ATOMIC_LOAD_UMIN:
case ISD::ATOMIC_LOAD_UMAX:
case ISD::ATOMIC_CMP_SWAP: {
std::pair<SDValue, SDValue> Tmp = ExpandAtomic(Node);
Results.push_back(Tmp.first);
Results.push_back(Tmp.second);
break;
}
case ISD::DYNAMIC_STACKALLOC:
ExpandDYNAMIC_STACKALLOC(Node, Results);
break;
case ISD::MERGE_VALUES:
for (unsigned i = 0; i < Node->getNumValues(); i++)
Results.push_back(Node->getOperand(i));
break;
case ISD::UNDEF: {
EVT VT = Node->getValueType(0);
if (VT.isInteger())
Results.push_back(DAG.getConstant(0, VT));
else {
assert(VT.isFloatingPoint() && "Unknown value type!");
Results.push_back(DAG.getConstantFP(0, VT));
}
break;
}
case ISD::TRAP: {
// If this operation is not supported, lower it to 'abort()' call
TargetLowering::ArgListTy Args;
std::pair<SDValue, SDValue> CallResult =
TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
false, false, false, false, 0, CallingConv::C,
/*isTailCall=*/false,
/*isReturnValueUsed=*/true,
DAG.getExternalSymbol("abort", TLI.getPointerTy()),
Args, DAG, dl);
Results.push_back(CallResult.second);
break;
}
case ISD::FP_ROUND:
case ISD::BITCAST:
Tmp1 = EmitStackConvert(Node->getOperand(0), Node->getValueType(0),
Node->getValueType(0), dl);
Results.push_back(Tmp1);
break;
case ISD::FP_EXTEND:
Tmp1 = EmitStackConvert(Node->getOperand(0),
Node->getOperand(0).getValueType(),
Node->getValueType(0), dl);
Results.push_back(Tmp1);
break;
case ISD::SIGN_EXTEND_INREG: {
// NOTE: we could fall back on load/store here too for targets without
// SAR. However, it is doubtful that any exist.
EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
EVT VT = Node->getValueType(0);
EVT ShiftAmountTy = TLI.getShiftAmountTy(VT);
if (VT.isVector())
ShiftAmountTy = VT;
unsigned BitsDiff = VT.getScalarType().getSizeInBits() -
ExtraVT.getScalarType().getSizeInBits();
SDValue ShiftCst = DAG.getConstant(BitsDiff, ShiftAmountTy);
Tmp1 = DAG.getNode(ISD::SHL, dl, Node->getValueType(0),
Node->getOperand(0), ShiftCst);
Tmp1 = DAG.getNode(ISD::SRA, dl, Node->getValueType(0), Tmp1, ShiftCst);
Results.push_back(Tmp1);
break;
}
case ISD::FP_ROUND_INREG: {
// The only way we can lower this is to turn it into a TRUNCSTORE,
// EXTLOAD pair, targeting a temporary location (a stack slot).
// NOTE: there is a choice here between constantly creating new stack
// slots and always reusing the same one. We currently always create
// new ones, as reuse may inhibit scheduling.
EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
Tmp1 = EmitStackConvert(Node->getOperand(0), ExtraVT,
Node->getValueType(0), dl);
Results.push_back(Tmp1);
break;
}
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP:
Tmp1 = ExpandLegalINT_TO_FP(Node->getOpcode() == ISD::SINT_TO_FP,
Node->getOperand(0), Node->getValueType(0), dl);
Results.push_back(Tmp1);
break;
case ISD::FP_TO_UINT: {
SDValue True, False;
EVT VT = Node->getOperand(0).getValueType();
EVT NVT = Node->getValueType(0);
APFloat apf(APInt::getNullValue(VT.getSizeInBits()));
APInt x = APInt::getSignBit(NVT.getSizeInBits());
(void)apf.convertFromAPInt(x, false, APFloat::rmNearestTiesToEven);
Tmp1 = DAG.getConstantFP(apf, VT);
Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(VT),
Node->getOperand(0),
Tmp1, ISD::SETLT);
True = DAG.getNode(ISD::FP_TO_SINT, dl, NVT, Node->getOperand(0));
False = DAG.getNode(ISD::FP_TO_SINT, dl, NVT,
DAG.getNode(ISD::FSUB, dl, VT,
Node->getOperand(0), Tmp1));
False = DAG.getNode(ISD::XOR, dl, NVT, False,
DAG.getConstant(x, NVT));
Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2, True, False);
Results.push_back(Tmp1);
break;
}
case ISD::VAARG: {
const Value *V = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
EVT VT = Node->getValueType(0);
Tmp1 = Node->getOperand(0);
Tmp2 = Node->getOperand(1);
unsigned Align = Node->getConstantOperandVal(3);
SDValue VAListLoad = DAG.getLoad(TLI.getPointerTy(), dl, Tmp1, Tmp2,
MachinePointerInfo(V), false, false, 0);
SDValue VAList = VAListLoad;
if (Align > TLI.getMinStackArgumentAlignment()) {
assert(((Align & (Align-1)) == 0) && "Expected Align to be a power of 2");
VAList = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
DAG.getConstant(Align - 1,
TLI.getPointerTy()));
VAList = DAG.getNode(ISD::AND, dl, TLI.getPointerTy(), VAList,
DAG.getConstant(-(int64_t)Align,
TLI.getPointerTy()));
}
// Increment the pointer, VAList, to the next vaarg
Tmp3 = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
DAG.getConstant(TLI.getTargetData()->
getTypeAllocSize(VT.getTypeForEVT(*DAG.getContext())),
TLI.getPointerTy()));
// Store the incremented VAList to the legalized pointer
Tmp3 = DAG.getStore(VAListLoad.getValue(1), dl, Tmp3, Tmp2,
MachinePointerInfo(V), false, false, 0);
// Load the actual argument out of the pointer VAList
Results.push_back(DAG.getLoad(VT, dl, Tmp3, VAList, MachinePointerInfo(),
false, false, 0));
Results.push_back(Results[0].getValue(1));
break;
}
case ISD::VACOPY: {
// This defaults to loading a pointer from the input and storing it to the
// output, returning the chain.
const Value *VD = cast<SrcValueSDNode>(Node->getOperand(3))->getValue();
const Value *VS = cast<SrcValueSDNode>(Node->getOperand(4))->getValue();
Tmp1 = DAG.getLoad(TLI.getPointerTy(), dl, Node->getOperand(0),
Node->getOperand(2), MachinePointerInfo(VS),
false, false, 0);
Tmp1 = DAG.getStore(Tmp1.getValue(1), dl, Tmp1, Node->getOperand(1),
MachinePointerInfo(VD), false, false, 0);
Results.push_back(Tmp1);
break;
}
case ISD::EXTRACT_VECTOR_ELT:
if (Node->getOperand(0).getValueType().getVectorNumElements() == 1)
// This must be an access of the only element. Return it.
Tmp1 = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0),
Node->getOperand(0));
else
Tmp1 = ExpandExtractFromVectorThroughStack(SDValue(Node, 0));
Results.push_back(Tmp1);
break;
case ISD::EXTRACT_SUBVECTOR:
Results.push_back(ExpandExtractFromVectorThroughStack(SDValue(Node, 0)));
break;
case ISD::INSERT_SUBVECTOR:
Results.push_back(ExpandInsertToVectorThroughStack(SDValue(Node, 0)));
break;
case ISD::CONCAT_VECTORS: {
Results.push_back(ExpandVectorBuildThroughStack(Node));
break;
}
case ISD::SCALAR_TO_VECTOR:
Results.push_back(ExpandSCALAR_TO_VECTOR(Node));
break;
case ISD::INSERT_VECTOR_ELT:
Results.push_back(ExpandINSERT_VECTOR_ELT(Node->getOperand(0),
Node->getOperand(1),
Node->getOperand(2), dl));
break;
case ISD::VECTOR_SHUFFLE: {
SmallVector<int, 8> Mask;
cast<ShuffleVectorSDNode>(Node)->getMask(Mask);
EVT VT = Node->getValueType(0);
EVT EltVT = VT.getVectorElementType();
if (!TLI.isTypeLegal(EltVT))
EltVT = TLI.getTypeToTransformTo(*DAG.getContext(), EltVT);
unsigned NumElems = VT.getVectorNumElements();
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0; i != NumElems; ++i) {
if (Mask[i] < 0) {
Ops.push_back(DAG.getUNDEF(EltVT));
continue;
}
unsigned Idx = Mask[i];
if (Idx < NumElems)
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
Node->getOperand(0),
DAG.getIntPtrConstant(Idx)));
else
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
Node->getOperand(1),
DAG.getIntPtrConstant(Idx - NumElems)));
}
Tmp1 = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], Ops.size());
Results.push_back(Tmp1);
break;
}
case ISD::EXTRACT_ELEMENT: {
EVT OpTy = Node->getOperand(0).getValueType();
if (cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue()) {
// 1 -> Hi
Tmp1 = DAG.getNode(ISD::SRL, dl, OpTy, Node->getOperand(0),
DAG.getConstant(OpTy.getSizeInBits()/2,
TLI.getShiftAmountTy(Node->getOperand(0).getValueType())));
Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0), Tmp1);
} else {
// 0 -> Lo
Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0),
Node->getOperand(0));
}
Results.push_back(Tmp1);
break;
}
case ISD::STACKSAVE:
// Expand to CopyFromReg if the target set
// StackPointerRegisterToSaveRestore.
if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, SP,
Node->getValueType(0)));
Results.push_back(Results[0].getValue(1));
} else {
Results.push_back(DAG.getUNDEF(Node->getValueType(0)));
Results.push_back(Node->getOperand(0));
}
break;
case ISD::STACKRESTORE:
// Expand to CopyToReg if the target set
// StackPointerRegisterToSaveRestore.
if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
Results.push_back(DAG.getCopyToReg(Node->getOperand(0), dl, SP,
Node->getOperand(1)));
} else {
Results.push_back(Node->getOperand(0));
}
break;
case ISD::FCOPYSIGN:
Results.push_back(ExpandFCOPYSIGN(Node));
break;
case ISD::FNEG:
// Expand Y = FNEG(X) -> Y = SUB -0.0, X
Tmp1 = DAG.getConstantFP(-0.0, Node->getValueType(0));
Tmp1 = DAG.getNode(ISD::FSUB, dl, Node->getValueType(0), Tmp1,
Node->getOperand(0));
Results.push_back(Tmp1);
break;
case ISD::FABS: {
// Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
EVT VT = Node->getValueType(0);
Tmp1 = Node->getOperand(0);
Tmp2 = DAG.getConstantFP(0.0, VT);
Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(Tmp1.getValueType()),
Tmp1, Tmp2, ISD::SETUGT);
Tmp3 = DAG.getNode(ISD::FNEG, dl, VT, Tmp1);
Tmp1 = DAG.getNode(ISD::SELECT, dl, VT, Tmp2, Tmp1, Tmp3);
Results.push_back(Tmp1);
break;
}
case ISD::FSQRT:
Results.push_back(ExpandFPLibCall(Node, RTLIB::SQRT_F32, RTLIB::SQRT_F64,
RTLIB::SQRT_F80, RTLIB::SQRT_PPCF128));
break;
case ISD::FSIN:
Results.push_back(ExpandFPLibCall(Node, RTLIB::SIN_F32, RTLIB::SIN_F64,
RTLIB::SIN_F80, RTLIB::SIN_PPCF128));
break;
case ISD::FCOS:
Results.push_back(ExpandFPLibCall(Node, RTLIB::COS_F32, RTLIB::COS_F64,
RTLIB::COS_F80, RTLIB::COS_PPCF128));
break;
case ISD::FLOG:
Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG_F32, RTLIB::LOG_F64,
RTLIB::LOG_F80, RTLIB::LOG_PPCF128));
break;
case ISD::FLOG2:
Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG2_F32, RTLIB::LOG2_F64,
RTLIB::LOG2_F80, RTLIB::LOG2_PPCF128));
break;
case ISD::FLOG10:
Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG10_F32, RTLIB::LOG10_F64,
RTLIB::LOG10_F80, RTLIB::LOG10_PPCF128));
break;
case ISD::FEXP:
Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP_F32, RTLIB::EXP_F64,
RTLIB::EXP_F80, RTLIB::EXP_PPCF128));
break;
case ISD::FEXP2:
Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP2_F32, RTLIB::EXP2_F64,
RTLIB::EXP2_F80, RTLIB::EXP2_PPCF128));
break;
case ISD::FTRUNC:
Results.push_back(ExpandFPLibCall(Node, RTLIB::TRUNC_F32, RTLIB::TRUNC_F64,
RTLIB::TRUNC_F80, RTLIB::TRUNC_PPCF128));
break;
case ISD::FFLOOR:
Results.push_back(ExpandFPLibCall(Node, RTLIB::FLOOR_F32, RTLIB::FLOOR_F64,
RTLIB::FLOOR_F80, RTLIB::FLOOR_PPCF128));
break;
case ISD::FCEIL:
Results.push_back(ExpandFPLibCall(Node, RTLIB::CEIL_F32, RTLIB::CEIL_F64,
RTLIB::CEIL_F80, RTLIB::CEIL_PPCF128));
break;
case ISD::FRINT:
Results.push_back(ExpandFPLibCall(Node, RTLIB::RINT_F32, RTLIB::RINT_F64,
RTLIB::RINT_F80, RTLIB::RINT_PPCF128));
break;
case ISD::FNEARBYINT:
Results.push_back(ExpandFPLibCall(Node, RTLIB::NEARBYINT_F32,
RTLIB::NEARBYINT_F64,
RTLIB::NEARBYINT_F80,
RTLIB::NEARBYINT_PPCF128));
break;
case ISD::FPOWI:
Results.push_back(ExpandFPLibCall(Node, RTLIB::POWI_F32, RTLIB::POWI_F64,
RTLIB::POWI_F80, RTLIB::POWI_PPCF128));
break;
case ISD::FPOW:
Results.push_back(ExpandFPLibCall(Node, RTLIB::POW_F32, RTLIB::POW_F64,
RTLIB::POW_F80, RTLIB::POW_PPCF128));
break;
case ISD::FDIV:
Results.push_back(ExpandFPLibCall(Node, RTLIB::DIV_F32, RTLIB::DIV_F64,
RTLIB::DIV_F80, RTLIB::DIV_PPCF128));
break;
case ISD::FREM:
Results.push_back(ExpandFPLibCall(Node, RTLIB::REM_F32, RTLIB::REM_F64,
RTLIB::REM_F80, RTLIB::REM_PPCF128));
break;
case ISD::FMA:
Results.push_back(ExpandFPLibCall(Node, RTLIB::FMA_F32, RTLIB::FMA_F64,
RTLIB::FMA_F80, RTLIB::FMA_PPCF128));
break;
case ISD::FP16_TO_FP32:
Results.push_back(ExpandLibCall(RTLIB::FPEXT_F16_F32, Node, false));
break;
case ISD::FP32_TO_FP16:
Results.push_back(ExpandLibCall(RTLIB::FPROUND_F32_F16, Node, false));
break;
case ISD::ConstantFP: {
ConstantFPSDNode *CFP = cast<ConstantFPSDNode>(Node);
// Check to see if this FP immediate is already legal.
// If this is a legal constant, turn it into a TargetConstantFP node.
if (TLI.isFPImmLegal(CFP->getValueAPF(), Node->getValueType(0)))
Results.push_back(SDValue(Node, 0));
else
Results.push_back(ExpandConstantFP(CFP, true, DAG, TLI));
break;
}
case ISD::EHSELECTION: {
unsigned Reg = TLI.getExceptionSelectorRegister();
assert(Reg && "Can't expand to unknown register!");
Results.push_back(DAG.getCopyFromReg(Node->getOperand(1), dl, Reg,
Node->getValueType(0)));
Results.push_back(Results[0].getValue(1));
break;
}
case ISD::EXCEPTIONADDR: {
unsigned Reg = TLI.getExceptionAddressRegister();
assert(Reg && "Can't expand to unknown register!");
Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, Reg,
Node->getValueType(0)));
Results.push_back(Results[0].getValue(1));
break;
}
case ISD::SUB: {
EVT VT = Node->getValueType(0);
assert(TLI.isOperationLegalOrCustom(ISD::ADD, VT) &&
TLI.isOperationLegalOrCustom(ISD::XOR, VT) &&
"Don't know how to expand this subtraction!");
Tmp1 = DAG.getNode(ISD::XOR, dl, VT, Node->getOperand(1),
DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT));
Tmp1 = DAG.getNode(ISD::ADD, dl, VT, Tmp2, DAG.getConstant(1, VT));
Results.push_back(DAG.getNode(ISD::ADD, dl, VT, Node->getOperand(0), Tmp1));
break;
}
case ISD::UREM:
case ISD::SREM: {
EVT VT = Node->getValueType(0);
SDVTList VTs = DAG.getVTList(VT, VT);
bool isSigned = Node->getOpcode() == ISD::SREM;
unsigned DivOpc = isSigned ? ISD::SDIV : ISD::UDIV;
unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
Tmp2 = Node->getOperand(0);
Tmp3 = Node->getOperand(1);
if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
(isDivRemLibcallAvailable(Node, isSigned, TLI) &&
UseDivRem(Node, isSigned, false))) {
Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Tmp2, Tmp3).getValue(1);
} else if (TLI.isOperationLegalOrCustom(DivOpc, VT)) {
// X % Y -> X-X/Y*Y
Tmp1 = DAG.getNode(DivOpc, dl, VT, Tmp2, Tmp3);
Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Tmp3);
Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Tmp2, Tmp1);
} else if (isSigned)
Tmp1 = ExpandIntLibCall(Node, true,
RTLIB::SREM_I8,
RTLIB::SREM_I16, RTLIB::SREM_I32,
RTLIB::SREM_I64, RTLIB::SREM_I128);
else
Tmp1 = ExpandIntLibCall(Node, false,
RTLIB::UREM_I8,
RTLIB::UREM_I16, RTLIB::UREM_I32,
RTLIB::UREM_I64, RTLIB::UREM_I128);
Results.push_back(Tmp1);
break;
}
case ISD::UDIV:
case ISD::SDIV: {
bool isSigned = Node->getOpcode() == ISD::SDIV;
unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
EVT VT = Node->getValueType(0);
SDVTList VTs = DAG.getVTList(VT, VT);
if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
(isDivRemLibcallAvailable(Node, isSigned, TLI) &&
UseDivRem(Node, isSigned, true)))
Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Node->getOperand(0),
Node->getOperand(1));
else if (isSigned)
Tmp1 = ExpandIntLibCall(Node, true,
RTLIB::SDIV_I8,
RTLIB::SDIV_I16, RTLIB::SDIV_I32,
RTLIB::SDIV_I64, RTLIB::SDIV_I128);
else
Tmp1 = ExpandIntLibCall(Node, false,
RTLIB::UDIV_I8,
RTLIB::UDIV_I16, RTLIB::UDIV_I32,
RTLIB::UDIV_I64, RTLIB::UDIV_I128);
Results.push_back(Tmp1);
break;
}
case ISD::MULHU:
case ISD::MULHS: {
unsigned ExpandOpcode = Node->getOpcode() == ISD::MULHU ? ISD::UMUL_LOHI :
ISD::SMUL_LOHI;
EVT VT = Node->getValueType(0);
SDVTList VTs = DAG.getVTList(VT, VT);
assert(TLI.isOperationLegalOrCustom(ExpandOpcode, VT) &&
"If this wasn't legal, it shouldn't have been created!");
Tmp1 = DAG.getNode(ExpandOpcode, dl, VTs, Node->getOperand(0),
Node->getOperand(1));
Results.push_back(Tmp1.getValue(1));
break;
}
case ISD::SDIVREM:
case ISD::UDIVREM:
// Expand into divrem libcall
ExpandDivRemLibCall(Node, Results);
break;
case ISD::MUL: {
EVT VT = Node->getValueType(0);
SDVTList VTs = DAG.getVTList(VT, VT);
// See if multiply or divide can be lowered using two-result operations.
// We just need the low half of the multiply; try both the signed
// and unsigned forms. If the target supports both SMUL_LOHI and
// UMUL_LOHI, form a preference by checking which forms of plain
// MULH it supports.
bool HasSMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::SMUL_LOHI, VT);
bool HasUMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::UMUL_LOHI, VT);
bool HasMULHS = TLI.isOperationLegalOrCustom(ISD::MULHS, VT);
bool HasMULHU = TLI.isOperationLegalOrCustom(ISD::MULHU, VT);
unsigned OpToUse = 0;
if (HasSMUL_LOHI && !HasMULHS) {
OpToUse = ISD::SMUL_LOHI;
} else if (HasUMUL_LOHI && !HasMULHU) {
OpToUse = ISD::UMUL_LOHI;
} else if (HasSMUL_LOHI) {
OpToUse = ISD::SMUL_LOHI;
} else if (HasUMUL_LOHI) {
OpToUse = ISD::UMUL_LOHI;
}
if (OpToUse) {
Results.push_back(DAG.getNode(OpToUse, dl, VTs, Node->getOperand(0),
Node->getOperand(1)));
break;
}
Tmp1 = ExpandIntLibCall(Node, false,
RTLIB::MUL_I8,
RTLIB::MUL_I16, RTLIB::MUL_I32,
RTLIB::MUL_I64, RTLIB::MUL_I128);
Results.push_back(Tmp1);
break;
}
case ISD::SADDO:
case ISD::SSUBO: {
SDValue LHS = Node->getOperand(0);
SDValue RHS = Node->getOperand(1);
SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::SADDO ?
ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
LHS, RHS);
Results.push_back(Sum);
EVT OType = Node->getValueType(1);
SDValue Zero = DAG.getConstant(0, LHS.getValueType());
// LHSSign -> LHS >= 0
// RHSSign -> RHS >= 0
// SumSign -> Sum >= 0
//
// Add:
// Overflow -> (LHSSign == RHSSign) && (LHSSign != SumSign)
// Sub:
// Overflow -> (LHSSign != RHSSign) && (LHSSign != SumSign)
//
SDValue LHSSign = DAG.getSetCC(dl, OType, LHS, Zero, ISD::SETGE);
SDValue RHSSign = DAG.getSetCC(dl, OType, RHS, Zero, ISD::SETGE);
SDValue SignsMatch = DAG.getSetCC(dl, OType, LHSSign, RHSSign,
Node->getOpcode() == ISD::SADDO ?
ISD::SETEQ : ISD::SETNE);
SDValue SumSign = DAG.getSetCC(dl, OType, Sum, Zero, ISD::SETGE);
SDValue SumSignNE = DAG.getSetCC(dl, OType, LHSSign, SumSign, ISD::SETNE);
SDValue Cmp = DAG.getNode(ISD::AND, dl, OType, SignsMatch, SumSignNE);
Results.push_back(Cmp);
break;
}
case ISD::UADDO:
case ISD::USUBO: {
SDValue LHS = Node->getOperand(0);
SDValue RHS = Node->getOperand(1);
SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::UADDO ?
ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
LHS, RHS);
Results.push_back(Sum);
Results.push_back(DAG.getSetCC(dl, Node->getValueType(1), Sum, LHS,
Node->getOpcode () == ISD::UADDO ?
ISD::SETULT : ISD::SETUGT));
break;
}
case ISD::UMULO:
case ISD::SMULO: {
EVT VT = Node->getValueType(0);
EVT WideVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits() * 2);
SDValue LHS = Node->getOperand(0);
SDValue RHS = Node->getOperand(1);
SDValue BottomHalf;
SDValue TopHalf;
static const unsigned Ops[2][3] =
{ { ISD::MULHU, ISD::UMUL_LOHI, ISD::ZERO_EXTEND },
{ ISD::MULHS, ISD::SMUL_LOHI, ISD::SIGN_EXTEND }};
bool isSigned = Node->getOpcode() == ISD::SMULO;
if (TLI.isOperationLegalOrCustom(Ops[isSigned][0], VT)) {
BottomHalf = DAG.getNode(ISD::MUL, dl, VT, LHS, RHS);
TopHalf = DAG.getNode(Ops[isSigned][0], dl, VT, LHS, RHS);
} else if (TLI.isOperationLegalOrCustom(Ops[isSigned][1], VT)) {
BottomHalf = DAG.getNode(Ops[isSigned][1], dl, DAG.getVTList(VT, VT), LHS,
RHS);
TopHalf = BottomHalf.getValue(1);
} else if (TLI.isTypeLegal(EVT::getIntegerVT(*DAG.getContext(),
VT.getSizeInBits() * 2))) {
LHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, LHS);
RHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, RHS);
Tmp1 = DAG.getNode(ISD::MUL, dl, WideVT, LHS, RHS);
BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
DAG.getIntPtrConstant(0));
TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
DAG.getIntPtrConstant(1));
} else {
// We can fall back to a libcall with an illegal type for the MUL if we
// have a libcall big enough.
// Also, we can fall back to a division in some cases, but that's a big
// performance hit in the general case.
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
if (WideVT == MVT::i16)
LC = RTLIB::MUL_I16;
else if (WideVT == MVT::i32)
LC = RTLIB::MUL_I32;
else if (WideVT == MVT::i64)
LC = RTLIB::MUL_I64;
else if (WideVT == MVT::i128)
LC = RTLIB::MUL_I128;
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Cannot expand this operation!");
// The high part is obtained by SRA'ing all but one of the bits of low
// part.
unsigned LoSize = VT.getSizeInBits();
SDValue HiLHS = DAG.getNode(ISD::SRA, dl, VT, RHS,
DAG.getConstant(LoSize-1, TLI.getPointerTy()));
SDValue HiRHS = DAG.getNode(ISD::SRA, dl, VT, LHS,
DAG.getConstant(LoSize-1, TLI.getPointerTy()));
// Here we're passing the 2 arguments explicitly as 4 arguments that are
// pre-lowered to the correct types. This all depends upon WideVT not
// being a legal type for the architecture and thus has to be split to
// two arguments.
SDValue Args[] = { LHS, HiLHS, RHS, HiRHS };
SDValue Ret = ExpandLibCall(LC, WideVT, Args, 4, isSigned, dl);
BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
DAG.getIntPtrConstant(0));
TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
DAG.getIntPtrConstant(1));
}
if (isSigned) {
Tmp1 = DAG.getConstant(VT.getSizeInBits() - 1,
TLI.getShiftAmountTy(BottomHalf.getValueType()));
Tmp1 = DAG.getNode(ISD::SRA, dl, VT, BottomHalf, Tmp1);
TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf, Tmp1,
ISD::SETNE);
} else {
TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf,
DAG.getConstant(0, VT), ISD::SETNE);
}
Results.push_back(BottomHalf);
Results.push_back(TopHalf);
break;
}
case ISD::BUILD_PAIR: {
EVT PairTy = Node->getValueType(0);
Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, PairTy, Node->getOperand(0));
Tmp2 = DAG.getNode(ISD::ANY_EXTEND, dl, PairTy, Node->getOperand(1));
Tmp2 = DAG.getNode(ISD::SHL, dl, PairTy, Tmp2,
DAG.getConstant(PairTy.getSizeInBits()/2,
TLI.getShiftAmountTy(PairTy)));
Results.push_back(DAG.getNode(ISD::OR, dl, PairTy, Tmp1, Tmp2));
break;
}
case ISD::SELECT:
Tmp1 = Node->getOperand(0);
Tmp2 = Node->getOperand(1);
Tmp3 = Node->getOperand(2);
if (Tmp1.getOpcode() == ISD::SETCC) {
Tmp1 = DAG.getSelectCC(dl, Tmp1.getOperand(0), Tmp1.getOperand(1),
Tmp2, Tmp3,
cast<CondCodeSDNode>(Tmp1.getOperand(2))->get());
} else {
Tmp1 = DAG.getSelectCC(dl, Tmp1,
DAG.getConstant(0, Tmp1.getValueType()),
Tmp2, Tmp3, ISD::SETNE);
}
Results.push_back(Tmp1);
break;
case ISD::BR_JT: {
SDValue Chain = Node->getOperand(0);
SDValue Table = Node->getOperand(1);
SDValue Index = Node->getOperand(2);
EVT PTy = TLI.getPointerTy();
const TargetData &TD = *TLI.getTargetData();
unsigned EntrySize =
DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
Index = DAG.getNode(ISD::MUL, dl, PTy,
Index, DAG.getConstant(EntrySize, PTy));
SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8);
SDValue LD = DAG.getExtLoad(ISD::SEXTLOAD, dl, PTy, Chain, Addr,
MachinePointerInfo::getJumpTable(), MemVT,
false, false, 0);
Addr = LD;
if (TM.getRelocationModel() == Reloc::PIC_) {
// For PIC, the sequence is:
// BRIND(load(Jumptable + index) + RelocBase)
// RelocBase can be JumpTable, GOT or some sort of global base.
Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr,
TLI.getPICJumpTableRelocBase(Table, DAG));
}
Tmp1 = DAG.getNode(ISD::BRIND, dl, MVT::Other, LD.getValue(1), Addr);
Results.push_back(Tmp1);
break;
}
case ISD::BRCOND:
// Expand brcond's setcc into its constituent parts and create a BR_CC
// Node.
Tmp1 = Node->getOperand(0);
Tmp2 = Node->getOperand(1);
if (Tmp2.getOpcode() == ISD::SETCC) {
Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other,
Tmp1, Tmp2.getOperand(2),
Tmp2.getOperand(0), Tmp2.getOperand(1),
Node->getOperand(2));
} else {
// We test only the i1 bit. Skip the AND if UNDEF.
Tmp3 = (Tmp2.getOpcode() == ISD::UNDEF) ? Tmp2 :
DAG.getNode(ISD::AND, dl, Tmp2.getValueType(), Tmp2,
DAG.getConstant(1, Tmp2.getValueType()));
Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other, Tmp1,
DAG.getCondCode(ISD::SETNE), Tmp3,
DAG.getConstant(0, Tmp3.getValueType()),
Node->getOperand(2));
}
Results.push_back(Tmp1);
break;
case ISD::SETCC: {
Tmp1 = Node->getOperand(0);
Tmp2 = Node->getOperand(1);
Tmp3 = Node->getOperand(2);
LegalizeSetCCCondCode(Node->getValueType(0), Tmp1, Tmp2, Tmp3, dl);
// If we expanded the SETCC into an AND/OR, return the new node
if (Tmp2.getNode() == 0) {
Results.push_back(Tmp1);
break;
}
// Otherwise, SETCC for the given comparison type must be completely
// illegal; expand it into a SELECT_CC.
EVT VT = Node->getValueType(0);
Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, VT, Tmp1, Tmp2,
DAG.getConstant(1, VT), DAG.getConstant(0, VT), Tmp3);
Results.push_back(Tmp1);
break;
}
case ISD::SELECT_CC: {
Tmp1 = Node->getOperand(0); // LHS
Tmp2 = Node->getOperand(1); // RHS
Tmp3 = Node->getOperand(2); // True
Tmp4 = Node->getOperand(3); // False
SDValue CC = Node->getOperand(4);
LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp1.getValueType()),
Tmp1, Tmp2, CC, dl);
assert(!Tmp2.getNode() && "Can't legalize SELECT_CC with legal condition!");
Tmp2 = DAG.getConstant(0, Tmp1.getValueType());
CC = DAG.getCondCode(ISD::SETNE);
Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, Node->getValueType(0), Tmp1, Tmp2,
Tmp3, Tmp4, CC);
Results.push_back(Tmp1);
break;
}
case ISD::BR_CC: {
Tmp1 = Node->getOperand(0); // Chain
Tmp2 = Node->getOperand(2); // LHS
Tmp3 = Node->getOperand(3); // RHS
Tmp4 = Node->getOperand(1); // CC
LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp2.getValueType()),
Tmp2, Tmp3, Tmp4, dl);
LastCALLSEQ_END = DAG.getEntryNode();
assert(!Tmp3.getNode() && "Can't legalize BR_CC with legal condition!");
Tmp3 = DAG.getConstant(0, Tmp2.getValueType());
Tmp4 = DAG.getCondCode(ISD::SETNE);
Tmp1 = DAG.getNode(ISD::BR_CC, dl, Node->getValueType(0), Tmp1, Tmp4, Tmp2,
Tmp3, Node->getOperand(4));
Results.push_back(Tmp1);
break;
}
case ISD::GLOBAL_OFFSET_TABLE:
case ISD::GlobalAddress:
case ISD::GlobalTLSAddress:
case ISD::ExternalSymbol:
case ISD::ConstantPool:
case ISD::JumpTable:
case ISD::INTRINSIC_W_CHAIN:
case ISD::INTRINSIC_WO_CHAIN:
case ISD::INTRINSIC_VOID:
// FIXME: Custom lowering for these operations shouldn't return null!
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
Results.push_back(SDValue(Node, i));
break;
}
}
void SelectionDAGLegalize::PromoteNode(SDNode *Node,
SmallVectorImpl<SDValue> &Results) {
EVT OVT = Node->getValueType(0);
if (Node->getOpcode() == ISD::UINT_TO_FP ||
Node->getOpcode() == ISD::SINT_TO_FP ||
Node->getOpcode() == ISD::SETCC) {
OVT = Node->getOperand(0).getValueType();
}
EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), OVT);
DebugLoc dl = Node->getDebugLoc();
SDValue Tmp1, Tmp2, Tmp3;
switch (Node->getOpcode()) {
case ISD::CTTZ:
case ISD::CTLZ:
case ISD::CTPOP:
// Zero extend the argument.
Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
// Perform the larger operation.
Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1);
if (Node->getOpcode() == ISD::CTTZ) {
//if Tmp1 == sizeinbits(NVT) then Tmp1 = sizeinbits(Old VT)
Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT),
Tmp1, DAG.getConstant(NVT.getSizeInBits(), NVT),
ISD::SETEQ);
Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2,
DAG.getConstant(OVT.getSizeInBits(), NVT), Tmp1);
} else if (Node->getOpcode() == ISD::CTLZ) {
// Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT))
Tmp1 = DAG.getNode(ISD::SUB, dl, NVT, Tmp1,
DAG.getConstant(NVT.getSizeInBits() -
OVT.getSizeInBits(), NVT));
}
Results.push_back(DAG.getNode(ISD::TRUNCATE, dl, OVT, Tmp1));
break;
case ISD::BSWAP: {
unsigned DiffBits = NVT.getSizeInBits() - OVT.getSizeInBits();
Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
Tmp1 = DAG.getNode(ISD::BSWAP, dl, NVT, Tmp1);
Tmp1 = DAG.getNode(ISD::SRL, dl, NVT, Tmp1,
DAG.getConstant(DiffBits, TLI.getShiftAmountTy(NVT)));
Results.push_back(Tmp1);
break;
}
case ISD::FP_TO_UINT:
case ISD::FP_TO_SINT:
Tmp1 = PromoteLegalFP_TO_INT(Node->getOperand(0), Node->getValueType(0),
Node->getOpcode() == ISD::FP_TO_SINT, dl);
Results.push_back(Tmp1);
break;
case ISD::UINT_TO_FP:
case ISD::SINT_TO_FP:
Tmp1 = PromoteLegalINT_TO_FP(Node->getOperand(0), Node->getValueType(0),
Node->getOpcode() == ISD::SINT_TO_FP, dl);
Results.push_back(Tmp1);
break;
case ISD::AND:
case ISD::OR:
case ISD::XOR: {
unsigned ExtOp, TruncOp;
if (OVT.isVector()) {
ExtOp = ISD::BITCAST;
TruncOp = ISD::BITCAST;
} else {
assert(OVT.isInteger() && "Cannot promote logic operation");
ExtOp = ISD::ANY_EXTEND;
TruncOp = ISD::TRUNCATE;
}
// Promote each of the values to the new type.
Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
// Perform the larger operation, then convert back
Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1, Tmp2);
Results.push_back(DAG.getNode(TruncOp, dl, OVT, Tmp1));
break;
}
case ISD::SELECT: {
unsigned ExtOp, TruncOp;
if (Node->getValueType(0).isVector()) {
ExtOp = ISD::BITCAST;
TruncOp = ISD::BITCAST;
} else if (Node->getValueType(0).isInteger()) {
ExtOp = ISD::ANY_EXTEND;
TruncOp = ISD::TRUNCATE;
} else {
ExtOp = ISD::FP_EXTEND;
TruncOp = ISD::FP_ROUND;
}
Tmp1 = Node->getOperand(0);
// Promote each of the values to the new type.
Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
Tmp3 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(2));
// Perform the larger operation, then round down.
Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp1, Tmp2, Tmp3);
if (TruncOp != ISD::FP_ROUND)
Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1);
else
Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1,
DAG.getIntPtrConstant(0));
Results.push_back(Tmp1);
break;
}
case ISD::VECTOR_SHUFFLE: {
SmallVector<int, 8> Mask;
cast<ShuffleVectorSDNode>(Node)->getMask(Mask);
// Cast the two input vectors.
Tmp1 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(0));
Tmp2 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(1));
// Convert the shuffle mask to the right # elements.
Tmp1 = ShuffleWithNarrowerEltType(NVT, OVT, dl, Tmp1, Tmp2, Mask);
Tmp1 = DAG.getNode(ISD::BITCAST, dl, OVT, Tmp1);
Results.push_back(Tmp1);
break;
}
case ISD::SETCC: {
unsigned ExtOp = ISD::FP_EXTEND;
if (NVT.isInteger()) {
ISD::CondCode CCCode =
cast<CondCodeSDNode>(Node->getOperand(2))->get();
ExtOp = isSignedIntSetCC(CCCode) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
}
Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
Results.push_back(DAG.getNode(ISD::SETCC, dl, Node->getValueType(0),
Tmp1, Tmp2, Node->getOperand(2)));
break;
}
}
}
// SelectionDAG::Legalize - This is the entry point for the file.
//
void SelectionDAG::Legalize() {
/// run - This is the main entry point to this class.
///
SelectionDAGLegalize(*this).LegalizeDAG();
}
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