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241f08ad4e
The argument list vector is never used after it has been passed to the CallLoweringInfo and moving it to the CallLoweringInfo is cleaner and pretty much as cheap as keeping a pointer to it. llvm-svn: 212135
268 lines
10 KiB
C++
268 lines
10 KiB
C++
//===-- X86SelectionDAGInfo.cpp - X86 SelectionDAG Info -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the X86SelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "X86InstrInfo.h"
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#include "X86ISelLowering.h"
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#include "X86RegisterInfo.h"
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#include "X86Subtarget.h"
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#include "X86SelectionDAGInfo.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/Target/TargetLowering.h"
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using namespace llvm;
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#define DEBUG_TYPE "x86-selectiondag-info"
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X86SelectionDAGInfo::X86SelectionDAGInfo(const DataLayout &DL)
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: TargetSelectionDAGInfo(&DL) {}
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X86SelectionDAGInfo::~X86SelectionDAGInfo() {}
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SDValue
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X86SelectionDAGInfo::EmitTargetCodeForMemset(SelectionDAG &DAG, SDLoc dl,
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SDValue Chain,
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SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align,
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bool isVolatile,
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MachinePointerInfo DstPtrInfo) const {
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ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
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const X86Subtarget &Subtarget = DAG.getTarget().getSubtarget<X86Subtarget>();
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// If to a segment-relative address space, use the default lowering.
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if (DstPtrInfo.getAddrSpace() >= 256)
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return SDValue();
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// If not DWORD aligned or size is more than the threshold, call the library.
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// The libc version is likely to be faster for these cases. It can use the
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// address value and run time information about the CPU.
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if ((Align & 3) != 0 || !ConstantSize ||
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ConstantSize->getZExtValue() > Subtarget.getMaxInlineSizeThreshold()) {
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// Check to see if there is a specialized entry-point for memory zeroing.
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ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
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if (const char *bzeroEntry = V &&
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V->isNullValue() ? Subtarget.getBZeroEntry() : nullptr) {
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EVT IntPtr = DAG.getTargetLoweringInfo().getPointerTy();
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Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
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TargetLowering::ArgListTy Args;
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TargetLowering::ArgListEntry Entry;
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Entry.Node = Dst;
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Entry.Ty = IntPtrTy;
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Args.push_back(Entry);
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Entry.Node = Size;
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Args.push_back(Entry);
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TargetLowering::CallLoweringInfo CLI(DAG);
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CLI.setDebugLoc(dl).setChain(Chain)
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.setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
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DAG.getExternalSymbol(bzeroEntry, IntPtr), std::move(Args),
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0)
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.setDiscardResult();
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std::pair<SDValue,SDValue> CallResult = DAG.getTargetLoweringInfo().LowerCallTo(CLI);
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return CallResult.second;
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}
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// Otherwise have the target-independent code call memset.
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return SDValue();
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}
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uint64_t SizeVal = ConstantSize->getZExtValue();
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SDValue InFlag;
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EVT AVT;
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SDValue Count;
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ConstantSDNode *ValC = dyn_cast<ConstantSDNode>(Src);
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unsigned BytesLeft = 0;
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bool TwoRepStos = false;
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if (ValC) {
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unsigned ValReg;
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uint64_t Val = ValC->getZExtValue() & 255;
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// If the value is a constant, then we can potentially use larger sets.
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switch (Align & 3) {
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case 2: // WORD aligned
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AVT = MVT::i16;
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ValReg = X86::AX;
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Val = (Val << 8) | Val;
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break;
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case 0: // DWORD aligned
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AVT = MVT::i32;
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ValReg = X86::EAX;
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Val = (Val << 8) | Val;
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Val = (Val << 16) | Val;
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if (Subtarget.is64Bit() && ((Align & 0x7) == 0)) { // QWORD aligned
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AVT = MVT::i64;
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ValReg = X86::RAX;
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Val = (Val << 32) | Val;
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}
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break;
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default: // Byte aligned
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AVT = MVT::i8;
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ValReg = X86::AL;
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Count = DAG.getIntPtrConstant(SizeVal);
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break;
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}
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if (AVT.bitsGT(MVT::i8)) {
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unsigned UBytes = AVT.getSizeInBits() / 8;
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Count = DAG.getIntPtrConstant(SizeVal / UBytes);
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BytesLeft = SizeVal % UBytes;
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}
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Chain = DAG.getCopyToReg(Chain, dl, ValReg, DAG.getConstant(Val, AVT),
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InFlag);
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InFlag = Chain.getValue(1);
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} else {
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AVT = MVT::i8;
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Count = DAG.getIntPtrConstant(SizeVal);
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Chain = DAG.getCopyToReg(Chain, dl, X86::AL, Src, InFlag);
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InFlag = Chain.getValue(1);
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}
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Chain = DAG.getCopyToReg(Chain, dl, Subtarget.is64Bit() ? X86::RCX : X86::ECX,
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Count, InFlag);
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InFlag = Chain.getValue(1);
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Chain = DAG.getCopyToReg(Chain, dl, Subtarget.is64Bit() ? X86::RDI : X86::EDI,
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Dst, InFlag);
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InFlag = Chain.getValue(1);
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SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
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SDValue Ops[] = { Chain, DAG.getValueType(AVT), InFlag };
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Chain = DAG.getNode(X86ISD::REP_STOS, dl, Tys, Ops);
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if (TwoRepStos) {
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InFlag = Chain.getValue(1);
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Count = Size;
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EVT CVT = Count.getValueType();
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SDValue Left = DAG.getNode(ISD::AND, dl, CVT, Count,
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DAG.getConstant((AVT == MVT::i64) ? 7 : 3, CVT));
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Chain = DAG.getCopyToReg(Chain, dl, (CVT == MVT::i64) ? X86::RCX :
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X86::ECX,
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Left, InFlag);
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InFlag = Chain.getValue(1);
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Tys = DAG.getVTList(MVT::Other, MVT::Glue);
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SDValue Ops[] = { Chain, DAG.getValueType(MVT::i8), InFlag };
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Chain = DAG.getNode(X86ISD::REP_STOS, dl, Tys, Ops);
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} else if (BytesLeft) {
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// Handle the last 1 - 7 bytes.
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unsigned Offset = SizeVal - BytesLeft;
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EVT AddrVT = Dst.getValueType();
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EVT SizeVT = Size.getValueType();
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Chain = DAG.getMemset(Chain, dl,
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DAG.getNode(ISD::ADD, dl, AddrVT, Dst,
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DAG.getConstant(Offset, AddrVT)),
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Src,
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DAG.getConstant(BytesLeft, SizeVT),
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Align, isVolatile, DstPtrInfo.getWithOffset(Offset));
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}
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// TODO: Use a Tokenfactor, as in memcpy, instead of a single chain.
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return Chain;
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}
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SDValue
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X86SelectionDAGInfo::EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl,
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SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align,
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bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo,
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MachinePointerInfo SrcPtrInfo) const {
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// This requires the copy size to be a constant, preferably
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// within a subtarget-specific limit.
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ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
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const X86Subtarget &Subtarget = DAG.getTarget().getSubtarget<X86Subtarget>();
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if (!ConstantSize)
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return SDValue();
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uint64_t SizeVal = ConstantSize->getZExtValue();
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if (!AlwaysInline && SizeVal > Subtarget.getMaxInlineSizeThreshold())
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return SDValue();
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/// If not DWORD aligned, it is more efficient to call the library. However
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/// if calling the library is not allowed (AlwaysInline), then soldier on as
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/// the code generated here is better than the long load-store sequence we
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/// would otherwise get.
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if (!AlwaysInline && (Align & 3) != 0)
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return SDValue();
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// If to a segment-relative address space, use the default lowering.
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if (DstPtrInfo.getAddrSpace() >= 256 ||
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SrcPtrInfo.getAddrSpace() >= 256)
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return SDValue();
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// ESI might be used as a base pointer, in that case we can't simply overwrite
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// the register. Fall back to generic code.
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const X86RegisterInfo *TRI =
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static_cast<const X86RegisterInfo *>(DAG.getTarget().getRegisterInfo());
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if (TRI->hasBasePointer(DAG.getMachineFunction()) &&
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TRI->getBaseRegister() == X86::ESI)
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return SDValue();
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MVT AVT;
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if (Align & 1)
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AVT = MVT::i8;
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else if (Align & 2)
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AVT = MVT::i16;
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else if (Align & 4)
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// DWORD aligned
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AVT = MVT::i32;
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else
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// QWORD aligned
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AVT = Subtarget.is64Bit() ? MVT::i64 : MVT::i32;
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unsigned UBytes = AVT.getSizeInBits() / 8;
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unsigned CountVal = SizeVal / UBytes;
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SDValue Count = DAG.getIntPtrConstant(CountVal);
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unsigned BytesLeft = SizeVal % UBytes;
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SDValue InFlag;
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Chain = DAG.getCopyToReg(Chain, dl, Subtarget.is64Bit() ? X86::RCX :
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X86::ECX,
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Count, InFlag);
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InFlag = Chain.getValue(1);
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Chain = DAG.getCopyToReg(Chain, dl, Subtarget.is64Bit() ? X86::RDI :
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X86::EDI,
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Dst, InFlag);
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InFlag = Chain.getValue(1);
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Chain = DAG.getCopyToReg(Chain, dl, Subtarget.is64Bit() ? X86::RSI :
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X86::ESI,
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Src, InFlag);
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InFlag = Chain.getValue(1);
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SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
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SDValue Ops[] = { Chain, DAG.getValueType(AVT), InFlag };
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SDValue RepMovs = DAG.getNode(X86ISD::REP_MOVS, dl, Tys, Ops);
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SmallVector<SDValue, 4> Results;
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Results.push_back(RepMovs);
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if (BytesLeft) {
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// Handle the last 1 - 7 bytes.
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unsigned Offset = SizeVal - BytesLeft;
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EVT DstVT = Dst.getValueType();
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EVT SrcVT = Src.getValueType();
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EVT SizeVT = Size.getValueType();
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Results.push_back(DAG.getMemcpy(Chain, dl,
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DAG.getNode(ISD::ADD, dl, DstVT, Dst,
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DAG.getConstant(Offset, DstVT)),
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DAG.getNode(ISD::ADD, dl, SrcVT, Src,
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DAG.getConstant(Offset, SrcVT)),
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DAG.getConstant(BytesLeft, SizeVT),
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Align, isVolatile, AlwaysInline,
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DstPtrInfo.getWithOffset(Offset),
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SrcPtrInfo.getWithOffset(Offset)));
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}
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return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Results);
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}
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