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split LowerMEMCPY into LowerMEMCPYCall and LowerMEMCPYInline in the ARM backend.

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llvm-svn: 43176
This commit is contained in:
Rafael Espindola 2007-10-19 14:35:17 +00:00
parent 1d41485be4
commit c751cbdb02
2 changed files with 70 additions and 29 deletions
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91
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -1288,40 +1288,73 @@ static SDOperand LowerSRx(SDOperand Op, SelectionDAG &DAG,
}
SDOperand ARMTargetLowering::LowerMEMCPY(SDOperand Op, SelectionDAG &DAG) {
SDOperand Chain = Op.getOperand(0);
SDOperand Dest = Op.getOperand(1);
SDOperand Src = Op.getOperand(2);
SDOperand Count = Op.getOperand(3);
unsigned Align =
(unsigned)cast<ConstantSDNode>(Op.getOperand(4))->getValue();
SDOperand ChainOp = Op.getOperand(0);
SDOperand DestOp = Op.getOperand(1);
SDOperand SourceOp = Op.getOperand(2);
SDOperand CountOp = Op.getOperand(3);
SDOperand AlignOp = Op.getOperand(4);
SDOperand AlwaysInlineOp = Op.getOperand(5);
bool AlwaysInline = (bool)cast<ConstantSDNode>(AlwaysInlineOp)->getValue();
unsigned Align = (unsigned)cast<ConstantSDNode>(AlignOp)->getValue();
if (Align == 0) Align = 1;
ConstantSDNode *I = dyn_cast<ConstantSDNode>(Count);
// Just call memcpy if:
// not 4-byte aligned
// size is unknown
// size is >= the threshold.
if ((Align & 3) != 0 ||
!I ||
I->getValue() >= 64 ||
(I->getValue() & 3) != 0) {
MVT::ValueType IntPtr = getPointerTy();
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = getTargetData()->getIntPtrType();
Entry.Node = Op.getOperand(1); Args.push_back(Entry);
Entry.Node = Op.getOperand(2); Args.push_back(Entry);
Entry.Node = Op.getOperand(3); Args.push_back(Entry);
std::pair<SDOperand,SDOperand> CallResult =
// If size is unknown, call memcpy.
ConstantSDNode *I = dyn_cast<ConstantSDNode>(CountOp);
if (!I) {
assert(!AlwaysInline && "Cannot inline copy of unknown size");
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
}
unsigned Size = I->getValue();
if (AlwaysInline)
return LowerMEMCPYInline(ChainOp, DestOp, SourceOp, Size, Align, DAG);
// The libc version is likely to be faster for the following cases. It can
// use the address value and run time information about the CPU.
// With glibc 2.6.1 on a core 2, coping an array of 100M longs was 30% faster
// If not DWORD aligned, call memcpy.
if ((Align & 3) != 0)
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
// If size is more than the threshold, call memcpy.
// if (Size > Subtarget->getMinRepStrSizeThreshold())
if (Size >= 64)
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
return LowerMEMCPYInline(ChainOp, DestOp, SourceOp, Size, Align, DAG);
}
SDOperand ARMTargetLowering::LowerMEMCPYCall(SDOperand Chain,
SDOperand Dest,
SDOperand Source,
SDOperand Count,
SelectionDAG &DAG) {
MVT::ValueType IntPtr = getPointerTy();
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = getTargetData()->getIntPtrType();
Entry.Node = Dest; Args.push_back(Entry);
Entry.Node = Source; Args.push_back(Entry);
Entry.Node = Count; Args.push_back(Entry);
std::pair<SDOperand,SDOperand> CallResult =
LowerCallTo(Chain, Type::VoidTy, false, false, CallingConv::C, false,
DAG.getExternalSymbol("memcpy", IntPtr), Args, DAG);
return CallResult.second;
}
return CallResult.second;
}
// Otherwise do repeated 4-byte loads and stores. To be improved.
assert((I->getValue() & 3) == 0);
SDOperand ARMTargetLowering::LowerMEMCPYInline(SDOperand Chain,
SDOperand Dest,
SDOperand Source,
unsigned Size,
unsigned Align,
SelectionDAG &DAG) {
// Do repeated 4-byte loads and stores. To be improved.
assert((Size& 3) == 0);
assert((Align & 3) == 0);
unsigned NumMemOps = I->getValue() >> 2;
unsigned NumMemOps = Size >> 2;
unsigned EmittedNumMemOps = 0;
unsigned SrcOff = 0, DstOff = 0;
MVT::ValueType VT = MVT::i32;
@ -1337,7 +1370,7 @@ SDOperand ARMTargetLowering::LowerMEMCPY(SDOperand Op, SelectionDAG &DAG) {
unsigned i;
for (i=0; i<MAX_LOADS_IN_LDM && EmittedNumMemOps+i < NumMemOps; i++) {
Loads[i] = DAG.getLoad(VT, Chain,
DAG.getNode(ISD::ADD, VT, Src,
DAG.getNode(ISD::ADD, VT, Source,
DAG.getConstant(SrcOff, VT)),
NULL, 0);
LoadChains[i] = Loads[i].getValue(1);

8
lib/Target/ARM/ARMISelLowering.h
View File

@ -135,6 +135,14 @@ namespace llvm {
SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerBR_JT(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerMEMCPY(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerMEMCPYCall(SDOperand Chain, SDOperand Dest,
SDOperand Source, SDOperand Count,
SelectionDAG &DAG);
SDOperand LowerMEMCPYInline(SDOperand Chain, SDOperand Dest,
SDOperand Source, unsigned Size,
unsigned Align, SelectionDAG &DAG);
};
}