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llvm-6502/lib/Target/NVPTX/NVPTXISelLowering.cpp
Justin Holewinski d2ea0e10cb Change interface for TargetLowering::LowerCallTo and TargetLowering::LowerCall 
to pass around a struct instead of a large set of individual values.  This
cleans up the interface and allows more information to be added to the struct
for future targets without requiring changes to each and every target.

NV_CONTRIB

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157479 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-25 16:35:28 +00:00

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//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that NVPTX uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#include "NVPTX.h"
#include "NVPTXISelLowering.h"
#include "NVPTXTargetMachine.h"
#include "NVPTXTargetObjectFile.h"
#include "NVPTXUtilities.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalValue.h"
#include "llvm/Module.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/MC/MCSectionELF.h"
#include <sstream>
#undef DEBUG_TYPE
#define DEBUG_TYPE "nvptx-lower"
using namespace llvm;
static unsigned int uniqueCallSite = 0;
static cl::opt<bool>
RetainVectorOperands("nvptx-codegen-vectors",
cl::desc("NVPTX Specific: Retain LLVM's vectors and generate PTX vectors"),
cl::init(true));
static cl::opt<bool>
sched4reg("nvptx-sched4reg",
cl::desc("NVPTX Specific: schedule for register pressue"),
cl::init(false));
// NVPTXTargetLowering Constructor.
NVPTXTargetLowering::NVPTXTargetLowering(NVPTXTargetMachine &TM)
: TargetLowering(TM, new NVPTXTargetObjectFile()),
nvTM(&TM),
nvptxSubtarget(TM.getSubtarget<NVPTXSubtarget>()) {
// always lower memset, memcpy, and memmove intrinsics to load/store
// instructions, rather
// then generating calls to memset, mempcy or memmove.
maxStoresPerMemset = (unsigned)0xFFFFFFFF;
maxStoresPerMemcpy = (unsigned)0xFFFFFFFF;
maxStoresPerMemmove = (unsigned)0xFFFFFFFF;
setBooleanContents(ZeroOrNegativeOneBooleanContent);
// Jump is Expensive. Don't create extra control flow for 'and', 'or'
// condition branches.
setJumpIsExpensive(true);
// By default, use the Source scheduling
if (sched4reg)
setSchedulingPreference(Sched::RegPressure);
else
setSchedulingPreference(Sched::Source);
addRegisterClass(MVT::i1, &NVPTX::Int1RegsRegClass);
addRegisterClass(MVT::i8, &NVPTX::Int8RegsRegClass);
addRegisterClass(MVT::i16, &NVPTX::Int16RegsRegClass);
addRegisterClass(MVT::i32, &NVPTX::Int32RegsRegClass);
addRegisterClass(MVT::i64, &NVPTX::Int64RegsRegClass);
addRegisterClass(MVT::f32, &NVPTX::Float32RegsRegClass);
addRegisterClass(MVT::f64, &NVPTX::Float64RegsRegClass);
if (RetainVectorOperands) {
addRegisterClass(MVT::v2f32, &NVPTX::V2F32RegsRegClass);
addRegisterClass(MVT::v4f32, &NVPTX::V4F32RegsRegClass);
addRegisterClass(MVT::v2i32, &NVPTX::V2I32RegsRegClass);
addRegisterClass(MVT::v4i32, &NVPTX::V4I32RegsRegClass);
addRegisterClass(MVT::v2f64, &NVPTX::V2F64RegsRegClass);
addRegisterClass(MVT::v2i64, &NVPTX::V2I64RegsRegClass);
addRegisterClass(MVT::v2i16, &NVPTX::V2I16RegsRegClass);
addRegisterClass(MVT::v4i16, &NVPTX::V4I16RegsRegClass);
addRegisterClass(MVT::v2i8, &NVPTX::V2I8RegsRegClass);
addRegisterClass(MVT::v4i8, &NVPTX::V4I8RegsRegClass);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i16 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i8 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2i32 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2f32 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2i16 , Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2i8 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v4i32 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v4f32 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v4i16 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v4i8 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2i64 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2f64 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2i32 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2f32 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2i16 , Custom);
setOperationAction(ISD::EXTRACT_SUBVECTOR, MVT::v2i8 , Custom);
}
// Operations not directly supported by NVPTX.
setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
setOperationAction(ISD::BR_CC, MVT::Other, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i64, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
if (nvptxSubtarget.hasROT64()) {
setOperationAction(ISD::ROTL , MVT::i64, Legal);
setOperationAction(ISD::ROTR , MVT::i64, Legal);
}
else {
setOperationAction(ISD::ROTL , MVT::i64, Expand);
setOperationAction(ISD::ROTR , MVT::i64, Expand);
}
if (nvptxSubtarget.hasROT32()) {
setOperationAction(ISD::ROTL , MVT::i32, Legal);
setOperationAction(ISD::ROTR , MVT::i32, Legal);
}
else {
setOperationAction(ISD::ROTL , MVT::i32, Expand);
setOperationAction(ISD::ROTR , MVT::i32, Expand);
}
setOperationAction(ISD::ROTL , MVT::i16, Expand);
setOperationAction(ISD::ROTR , MVT::i16, Expand);
setOperationAction(ISD::ROTL , MVT::i8, Expand);
setOperationAction(ISD::ROTR , MVT::i8, Expand);
setOperationAction(ISD::BSWAP , MVT::i16, Expand);
setOperationAction(ISD::BSWAP , MVT::i32, Expand);
setOperationAction(ISD::BSWAP , MVT::i64, Expand);
// Indirect branch is not supported.
// This also disables Jump Table creation.
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
setOperationAction(ISD::BRIND, MVT::Other, Expand);
setOperationAction(ISD::GlobalAddress , MVT::i32 , Custom);
setOperationAction(ISD::GlobalAddress , MVT::i64 , Custom);
// We want to legalize constant related memmove and memcopy
// intrinsics.
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::Other, Custom);
// Turn FP extload into load/fextend
setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
// Turn FP truncstore into trunc + store.
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// PTX does not support load / store predicate registers
setOperationAction(ISD::LOAD, MVT::i1, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
setOperationAction(ISD::STORE, MVT::i1, Expand);
setTruncStoreAction(MVT::i64, MVT::i1, Expand);
setTruncStoreAction(MVT::i32, MVT::i1, Expand);
setTruncStoreAction(MVT::i16, MVT::i1, Expand);
setTruncStoreAction(MVT::i8, MVT::i1, Expand);
// This is legal in NVPTX
setOperationAction(ISD::ConstantFP, MVT::f64, Legal);
setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
// TRAP can be lowered to PTX trap
setOperationAction(ISD::TRAP, MVT::Other, Legal);
// By default, CONCAT_VECTORS is implemented via store/load
// through stack. It is slow and uses local memory. We need
// to custom-lowering them.
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i32 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4f32 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i16 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i8 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2i64 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2f64 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2i32 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2f32 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2i16 , Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2i8 , Custom);
// Expand vector int to float and float to int conversions
// - For SINT_TO_FP and UINT_TO_FP, the src type
// (Node->getOperand(0).getValueType())
// is used to determine the action, while for FP_TO_UINT and FP_TO_SINT,
// the dest type (Node->getValueType(0)) is used.
//
// See VectorLegalizer::LegalizeOp() (LegalizeVectorOps.cpp) for the vector
// case, and
// SelectionDAGLegalize::LegalizeOp() (LegalizeDAG.cpp) for the scalar case.
//
// That is why v4i32 or v2i32 are used here.
//
// The expansion for vectors happens in VectorLegalizer::LegalizeOp()
// (LegalizeVectorOps.cpp).
setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Expand);
setOperationAction(ISD::SINT_TO_FP, MVT::v2i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::v2i32, Expand);
setOperationAction(ISD::FP_TO_SINT, MVT::v2i32, Expand);
setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Expand);
setOperationAction(ISD::FP_TO_UINT, MVT::v2i32, Expand);
setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Expand);
// Now deduce the information based on the above mentioned
// actions
computeRegisterProperties();
}
const char *NVPTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case NVPTXISD::CALL: return "NVPTXISD::CALL";
case NVPTXISD::RET_FLAG: return "NVPTXISD::RET_FLAG";
case NVPTXISD::Wrapper: return "NVPTXISD::Wrapper";
case NVPTXISD::NVBuiltin: return "NVPTXISD::NVBuiltin";
case NVPTXISD::DeclareParam: return "NVPTXISD::DeclareParam";
case NVPTXISD::DeclareScalarParam:
return "NVPTXISD::DeclareScalarParam";
case NVPTXISD::DeclareRet: return "NVPTXISD::DeclareRet";
case NVPTXISD::DeclareRetParam: return "NVPTXISD::DeclareRetParam";
case NVPTXISD::PrintCall: return "NVPTXISD::PrintCall";
case NVPTXISD::LoadParam: return "NVPTXISD::LoadParam";
case NVPTXISD::StoreParam: return "NVPTXISD::StoreParam";
case NVPTXISD::StoreParamS32: return "NVPTXISD::StoreParamS32";
case NVPTXISD::StoreParamU32: return "NVPTXISD::StoreParamU32";
case NVPTXISD::MoveToParam: return "NVPTXISD::MoveToParam";
case NVPTXISD::CallArgBegin: return "NVPTXISD::CallArgBegin";
case NVPTXISD::CallArg: return "NVPTXISD::CallArg";
case NVPTXISD::LastCallArg: return "NVPTXISD::LastCallArg";
case NVPTXISD::CallArgEnd: return "NVPTXISD::CallArgEnd";
case NVPTXISD::CallVoid: return "NVPTXISD::CallVoid";
case NVPTXISD::CallVal: return "NVPTXISD::CallVal";
case NVPTXISD::CallSymbol: return "NVPTXISD::CallSymbol";
case NVPTXISD::Prototype: return "NVPTXISD::Prototype";
case NVPTXISD::MoveParam: return "NVPTXISD::MoveParam";
case NVPTXISD::MoveRetval: return "NVPTXISD::MoveRetval";
case NVPTXISD::MoveToRetval: return "NVPTXISD::MoveToRetval";
case NVPTXISD::StoreRetval: return "NVPTXISD::StoreRetval";
case NVPTXISD::PseudoUseParam: return "NVPTXISD::PseudoUseParam";
case NVPTXISD::RETURN: return "NVPTXISD::RETURN";
case NVPTXISD::CallSeqBegin: return "NVPTXISD::CallSeqBegin";
case NVPTXISD::CallSeqEnd: return "NVPTXISD::CallSeqEnd";
}
}
SDValue
NVPTXTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
Op = DAG.getTargetGlobalAddress(GV, dl, getPointerTy());
return DAG.getNode(NVPTXISD::Wrapper, dl, getPointerTy(), Op);
}
std::string NVPTXTargetLowering::getPrototype(Type *retTy,
const ArgListTy &Args,
const SmallVectorImpl<ISD::OutputArg> &Outs,
unsigned retAlignment) const {
bool isABI = (nvptxSubtarget.getSmVersion() >= 20);
std::stringstream O;
O << "prototype_" << uniqueCallSite << " : .callprototype ";
if (retTy->getTypeID() == Type::VoidTyID)
O << "()";
else {
O << "(";
if (isABI) {
if (retTy->isPrimitiveType() || retTy->isIntegerTy()) {
unsigned size = 0;
if (const IntegerType *ITy = dyn_cast<IntegerType>(retTy)) {
size = ITy->getBitWidth();
if (size < 32) size = 32;
}
else {
assert(retTy->isFloatingPointTy() &&
"Floating point type expected here");
size = retTy->getPrimitiveSizeInBits();
}
O << ".param .b" << size << " _";
}
else if (isa<PointerType>(retTy))
O << ".param .b" << getPointerTy().getSizeInBits()
<< " _";
else {
if ((retTy->getTypeID() == Type::StructTyID) ||
isa<VectorType>(retTy)) {
SmallVector<EVT, 16> vtparts;
ComputeValueVTs(*this, retTy, vtparts);
unsigned totalsz = 0;
for (unsigned i=0,e=vtparts.size(); i!=e; ++i) {
unsigned elems = 1;
EVT elemtype = vtparts[i];
if (vtparts[i].isVector()) {
elems = vtparts[i].getVectorNumElements();
elemtype = vtparts[i].getVectorElementType();
}
for (unsigned j=0, je=elems; j!=je; ++j) {
unsigned sz = elemtype.getSizeInBits();
if (elemtype.isInteger() && (sz < 8)) sz = 8;
totalsz += sz/8;
}
}
O << ".param .align "
<< retAlignment
<< " .b8 _["
<< totalsz << "]";
}
else {
assert(false &&
"Unknown return type");
}
}
}
else {
SmallVector<EVT, 16> vtparts;
ComputeValueVTs(*this, retTy, vtparts);
unsigned idx = 0;
for (unsigned i=0,e=vtparts.size(); i!=e; ++i) {
unsigned elems = 1;
EVT elemtype = vtparts[i];
if (vtparts[i].isVector()) {
elems = vtparts[i].getVectorNumElements();
elemtype = vtparts[i].getVectorElementType();
}
for (unsigned j=0, je=elems; j!=je; ++j) {
unsigned sz = elemtype.getSizeInBits();
if (elemtype.isInteger() && (sz < 32)) sz = 32;
O << ".reg .b" << sz << " _";
if (j<je-1) O << ", ";
++idx;
}
if (i < e-1)
O << ", ";
}
}
O << ") ";
}
O << "_ (";
bool first = true;
MVT thePointerTy = getPointerTy();
for (unsigned i=0,e=Args.size(); i!=e; ++i) {
const Type *Ty = Args[i].Ty;
if (!first) {
O << ", ";
}
first = false;
if (Outs[i].Flags.isByVal() == false) {
unsigned sz = 0;
if (isa<IntegerType>(Ty)) {
sz = cast<IntegerType>(Ty)->getBitWidth();
if (sz < 32) sz = 32;
}
else if (isa<PointerType>(Ty))
sz = thePointerTy.getSizeInBits();
else
sz = Ty->getPrimitiveSizeInBits();
if (isABI)
O << ".param .b" << sz << " ";
else
O << ".reg .b" << sz << " ";
O << "_";
continue;
}
const PointerType *PTy = dyn_cast<PointerType>(Ty);
assert(PTy &&
"Param with byval attribute should be a pointer type");
Type *ETy = PTy->getElementType();
if (isABI) {
unsigned align = Outs[i].Flags.getByValAlign();
unsigned sz = getTargetData()->getTypeAllocSize(ETy);
O << ".param .align " << align
<< " .b8 ";
O << "_";
O << "[" << sz << "]";
continue;
}
else {
SmallVector<EVT, 16> vtparts;
ComputeValueVTs(*this, ETy, vtparts);
for (unsigned i=0,e=vtparts.size(); i!=e; ++i) {
unsigned elems = 1;
EVT elemtype = vtparts[i];
if (vtparts[i].isVector()) {
elems = vtparts[i].getVectorNumElements();
elemtype = vtparts[i].getVectorElementType();
}
for (unsigned j=0,je=elems; j!=je; ++j) {
unsigned sz = elemtype.getSizeInBits();
if (elemtype.isInteger() && (sz < 32)) sz = 32;
O << ".reg .b" << sz << " ";
O << "_";
if (j<je-1) O << ", ";
}
if (i<e-1)
O << ", ";
}
continue;
}
}
O << ");";
return O.str();
}
SDValue
NVPTXTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const {
SelectionDAG &DAG = CLI.DAG;
DebugLoc &dl = CLI.DL;
SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
SDValue Chain = CLI.Chain;
SDValue Callee = CLI.Callee;
bool &isTailCall = CLI.IsTailCall;
ArgListTy &Args = CLI.Args;
Type *retTy = CLI.RetTy;
ImmutableCallSite *CS = CLI.CS;
bool isABI = (nvptxSubtarget.getSmVersion() >= 20);
SDValue tempChain = Chain;
Chain = DAG.getCALLSEQ_START(Chain,
DAG.getIntPtrConstant(uniqueCallSite, true));
SDValue InFlag = Chain.getValue(1);
assert((Outs.size() == Args.size()) &&
"Unexpected number of arguments to function call");
unsigned paramCount = 0;
// Declare the .params or .reg need to pass values
// to the function
for (unsigned i=0, e=Outs.size(); i!=e; ++i) {
EVT VT = Outs[i].VT;
if (Outs[i].Flags.isByVal() == false) {
// Plain scalar
// for ABI, declare .param .b<size> .param<n>;
// for nonABI, declare .reg .b<size> .param<n>;
unsigned isReg = 1;
if (isABI)
isReg = 0;
unsigned sz = VT.getSizeInBits();
if (VT.isInteger() && (sz < 32)) sz = 32;
SDVTList DeclareParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue DeclareParamOps[] = { Chain,
DAG.getConstant(paramCount, MVT::i32),
DAG.getConstant(sz, MVT::i32),
DAG.getConstant(isReg, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareScalarParam, dl, DeclareParamVTs,
DeclareParamOps, 5);
InFlag = Chain.getValue(1);
SDVTList CopyParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CopyParamOps[] = { Chain, DAG.getConstant(paramCount, MVT::i32),
DAG.getConstant(0, MVT::i32), OutVals[i], InFlag };
unsigned opcode = NVPTXISD::StoreParam;
if (isReg)
opcode = NVPTXISD::MoveToParam;
else {
if (Outs[i].Flags.isZExt())
opcode = NVPTXISD::StoreParamU32;
else if (Outs[i].Flags.isSExt())
opcode = NVPTXISD::StoreParamS32;
}
Chain = DAG.getNode(opcode, dl, CopyParamVTs, CopyParamOps, 5);
InFlag = Chain.getValue(1);
++paramCount;
continue;
}
// struct or vector
SmallVector<EVT, 16> vtparts;
const PointerType *PTy = dyn_cast<PointerType>(Args[i].Ty);
assert(PTy &&
"Type of a byval parameter should be pointer");
ComputeValueVTs(*this, PTy->getElementType(), vtparts);
if (isABI) {
// declare .param .align 16 .b8 .param<n>[<size>];
unsigned sz = Outs[i].Flags.getByValSize();
SDVTList DeclareParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
// The ByValAlign in the Outs[i].Flags is alway set at this point, so we
// don't need to
// worry about natural alignment or not. See TargetLowering::LowerCallTo()
SDValue DeclareParamOps[] = { Chain,
DAG.getConstant(Outs[i].Flags.getByValAlign(), MVT::i32),
DAG.getConstant(paramCount, MVT::i32),
DAG.getConstant(sz, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareParam, dl, DeclareParamVTs,
DeclareParamOps, 5);
InFlag = Chain.getValue(1);
unsigned curOffset = 0;
for (unsigned j=0,je=vtparts.size(); j!=je; ++j) {
unsigned elems = 1;
EVT elemtype = vtparts[j];
if (vtparts[j].isVector()) {
elems = vtparts[j].getVectorNumElements();
elemtype = vtparts[j].getVectorElementType();
}
for (unsigned k=0,ke=elems; k!=ke; ++k) {
unsigned sz = elemtype.getSizeInBits();
if (elemtype.isInteger() && (sz < 8)) sz = 8;
SDValue srcAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(),
OutVals[i],
DAG.getConstant(curOffset,
getPointerTy()));
SDValue theVal = DAG.getLoad(elemtype, dl, tempChain, srcAddr,
MachinePointerInfo(), false, false, false, 0);
SDVTList CopyParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CopyParamOps[] = { Chain, DAG.getConstant(paramCount,
MVT::i32),
DAG.getConstant(curOffset, MVT::i32),
theVal, InFlag };
Chain = DAG.getNode(NVPTXISD::StoreParam, dl, CopyParamVTs,
CopyParamOps, 5);
InFlag = Chain.getValue(1);
curOffset += sz/8;
}
}
++paramCount;
continue;
}
// Non-abi, struct or vector
// Declare a bunch or .reg .b<size> .param<n>
unsigned curOffset = 0;
for (unsigned j=0,je=vtparts.size(); j!=je; ++j) {
unsigned elems = 1;
EVT elemtype = vtparts[j];
if (vtparts[j].isVector()) {
elems = vtparts[j].getVectorNumElements();
elemtype = vtparts[j].getVectorElementType();
}
for (unsigned k=0,ke=elems; k!=ke; ++k) {
unsigned sz = elemtype.getSizeInBits();
if (elemtype.isInteger() && (sz < 32)) sz = 32;
SDVTList DeclareParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue DeclareParamOps[] = { Chain, DAG.getConstant(paramCount,
MVT::i32),
DAG.getConstant(sz, MVT::i32),
DAG.getConstant(1, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareScalarParam, dl, DeclareParamVTs,
DeclareParamOps, 5);
InFlag = Chain.getValue(1);
SDValue srcAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(), OutVals[i],
DAG.getConstant(curOffset,
getPointerTy()));
SDValue theVal = DAG.getLoad(elemtype, dl, tempChain, srcAddr,
MachinePointerInfo(), false, false, false, 0);
SDVTList CopyParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CopyParamOps[] = { Chain, DAG.getConstant(paramCount, MVT::i32),
DAG.getConstant(0, MVT::i32), theVal,
InFlag };
Chain = DAG.getNode(NVPTXISD::MoveToParam, dl, CopyParamVTs,
CopyParamOps, 5);
InFlag = Chain.getValue(1);
++paramCount;
}
}
}
GlobalAddressSDNode *Func = dyn_cast<GlobalAddressSDNode>(Callee.getNode());
unsigned retAlignment = 0;
// Handle Result
unsigned retCount = 0;
if (Ins.size() > 0) {
SmallVector<EVT, 16> resvtparts;
ComputeValueVTs(*this, retTy, resvtparts);
// Declare one .param .align 16 .b8 func_retval0[<size>] for ABI or
// individual .reg .b<size> func_retval<0..> for non ABI
unsigned resultsz = 0;
for (unsigned i=0,e=resvtparts.size(); i!=e; ++i) {
unsigned elems = 1;
EVT elemtype = resvtparts[i];
if (resvtparts[i].isVector()) {
elems = resvtparts[i].getVectorNumElements();
elemtype = resvtparts[i].getVectorElementType();
}
for (unsigned j=0,je=elems; j!=je; ++j) {
unsigned sz = elemtype.getSizeInBits();
if (isABI == false) {
if (elemtype.isInteger() && (sz < 32)) sz = 32;
}
else {
if (elemtype.isInteger() && (sz < 8)) sz = 8;
}
if (isABI == false) {
SDVTList DeclareRetVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue DeclareRetOps[] = { Chain, DAG.getConstant(2, MVT::i32),
DAG.getConstant(sz, MVT::i32),
DAG.getConstant(retCount, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareRet, dl, DeclareRetVTs,
DeclareRetOps, 5);
InFlag = Chain.getValue(1);
++retCount;
}
resultsz += sz;
}
}
if (isABI) {
if (retTy->isPrimitiveType() || retTy->isIntegerTy() ||
retTy->isPointerTy() ) {
// Scalar needs to be at least 32bit wide
if (resultsz < 32)
resultsz = 32;
SDVTList DeclareRetVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue DeclareRetOps[] = { Chain, DAG.getConstant(1, MVT::i32),
DAG.getConstant(resultsz, MVT::i32),
DAG.getConstant(0, MVT::i32), InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareRet, dl, DeclareRetVTs,
DeclareRetOps, 5);
InFlag = Chain.getValue(1);
}
else {
if (Func) { // direct call
if (!llvm::getAlign(*(CS->getCalledFunction()), 0, retAlignment))
retAlignment = getTargetData()->getABITypeAlignment(retTy);
} else { // indirect call
const CallInst *CallI = dyn_cast<CallInst>(CS->getInstruction());
if (!llvm::getAlign(*CallI, 0, retAlignment))
retAlignment = getTargetData()->getABITypeAlignment(retTy);
}
SDVTList DeclareRetVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue DeclareRetOps[] = { Chain, DAG.getConstant(retAlignment,
MVT::i32),
DAG.getConstant(resultsz/8, MVT::i32),
DAG.getConstant(0, MVT::i32), InFlag };
Chain = DAG.getNode(NVPTXISD::DeclareRetParam, dl, DeclareRetVTs,
DeclareRetOps, 5);
InFlag = Chain.getValue(1);
}
}
}
if (!Func) {
// This is indirect function call case : PTX requires a prototype of the
// form
// proto_0 : .callprototype(.param .b32 _) _ (.param .b32 _);
// to be emitted, and the label has to used as the last arg of call
// instruction.
// The prototype is embedded in a string and put as the operand for an
// INLINEASM SDNode.
SDVTList InlineAsmVTs = DAG.getVTList(MVT::Other, MVT::Glue);
std::string proto_string = getPrototype(retTy, Args, Outs, retAlignment);
const char *asmstr = nvTM->getManagedStrPool()->
getManagedString(proto_string.c_str())->c_str();
SDValue InlineAsmOps[] = { Chain,
DAG.getTargetExternalSymbol(asmstr,
getPointerTy()),
DAG.getMDNode(0),
DAG.getTargetConstant(0, MVT::i32), InFlag };
Chain = DAG.getNode(ISD::INLINEASM, dl, InlineAsmVTs, InlineAsmOps, 5);
InFlag = Chain.getValue(1);
}
// Op to just print "call"
SDVTList PrintCallVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue PrintCallOps[] = { Chain,
DAG.getConstant(isABI ? ((Ins.size()==0) ? 0 : 1)
: retCount, MVT::i32),
InFlag };
Chain = DAG.getNode(Func?(NVPTXISD::PrintCallUni):(NVPTXISD::PrintCall), dl,
PrintCallVTs, PrintCallOps, 3);
InFlag = Chain.getValue(1);
// Ops to print out the function name
SDVTList CallVoidVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CallVoidOps[] = { Chain, Callee, InFlag };
Chain = DAG.getNode(NVPTXISD::CallVoid, dl, CallVoidVTs, CallVoidOps, 3);
InFlag = Chain.getValue(1);
// Ops to print out the param list
SDVTList CallArgBeginVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CallArgBeginOps[] = { Chain, InFlag };
Chain = DAG.getNode(NVPTXISD::CallArgBegin, dl, CallArgBeginVTs,
CallArgBeginOps, 2);
InFlag = Chain.getValue(1);
for (unsigned i=0, e=paramCount; i!=e; ++i) {
unsigned opcode;
if (i==(e-1))
opcode = NVPTXISD::LastCallArg;
else
opcode = NVPTXISD::CallArg;
SDVTList CallArgVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CallArgOps[] = { Chain, DAG.getConstant(1, MVT::i32),
DAG.getConstant(i, MVT::i32),
InFlag };
Chain = DAG.getNode(opcode, dl, CallArgVTs, CallArgOps, 4);
InFlag = Chain.getValue(1);
}
SDVTList CallArgEndVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue CallArgEndOps[] = { Chain,
DAG.getConstant(Func ? 1 : 0, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::CallArgEnd, dl, CallArgEndVTs, CallArgEndOps,
3);
InFlag = Chain.getValue(1);
if (!Func) {
SDVTList PrototypeVTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue PrototypeOps[] = { Chain,
DAG.getConstant(uniqueCallSite, MVT::i32),
InFlag };
Chain = DAG.getNode(NVPTXISD::Prototype, dl, PrototypeVTs, PrototypeOps, 3);
InFlag = Chain.getValue(1);
}
// Generate loads from param memory/moves from registers for result
if (Ins.size() > 0) {
if (isABI) {
unsigned resoffset = 0;
for (unsigned i=0,e=Ins.size(); i!=e; ++i) {
unsigned sz = Ins[i].VT.getSizeInBits();
if (Ins[i].VT.isInteger() && (sz < 8)) sz = 8;
std::vector<EVT> LoadRetVTs;
LoadRetVTs.push_back(Ins[i].VT);
LoadRetVTs.push_back(MVT::Other); LoadRetVTs.push_back(MVT::Glue);
std::vector<SDValue> LoadRetOps;
LoadRetOps.push_back(Chain);
LoadRetOps.push_back(DAG.getConstant(1, MVT::i32));
LoadRetOps.push_back(DAG.getConstant(resoffset, MVT::i32));
LoadRetOps.push_back(InFlag);
SDValue retval = DAG.getNode(NVPTXISD::LoadParam, dl, LoadRetVTs,
&LoadRetOps[0], LoadRetOps.size());
Chain = retval.getValue(1);
InFlag = retval.getValue(2);
InVals.push_back(retval);
resoffset += sz/8;
}
}
else {
SmallVector<EVT, 16> resvtparts;
ComputeValueVTs(*this, retTy, resvtparts);
assert(Ins.size() == resvtparts.size() &&
"Unexpected number of return values in non-ABI case");
unsigned paramNum = 0;
for (unsigned i=0,e=Ins.size(); i!=e; ++i) {
assert(EVT(Ins[i].VT) == resvtparts[i] &&
"Unexpected EVT type in non-ABI case");
unsigned numelems = 1;
EVT elemtype = Ins[i].VT;
if (Ins[i].VT.isVector()) {
numelems = Ins[i].VT.getVectorNumElements();
elemtype = Ins[i].VT.getVectorElementType();
}
std::vector<SDValue> tempRetVals;
for (unsigned j=0; j<numelems; ++j) {
std::vector<EVT> MoveRetVTs;
MoveRetVTs.push_back(elemtype);
MoveRetVTs.push_back(MVT::Other); MoveRetVTs.push_back(MVT::Glue);
std::vector<SDValue> MoveRetOps;
MoveRetOps.push_back(Chain);
MoveRetOps.push_back(DAG.getConstant(0, MVT::i32));
MoveRetOps.push_back(DAG.getConstant(paramNum, MVT::i32));
MoveRetOps.push_back(InFlag);
SDValue retval = DAG.getNode(NVPTXISD::LoadParam, dl, MoveRetVTs,
&MoveRetOps[0], MoveRetOps.size());
Chain = retval.getValue(1);
InFlag = retval.getValue(2);
tempRetVals.push_back(retval);
++paramNum;
}
if (Ins[i].VT.isVector())
InVals.push_back(DAG.getNode(ISD::BUILD_VECTOR, dl, Ins[i].VT,
&tempRetVals[0], tempRetVals.size()));
else
InVals.push_back(tempRetVals[0]);
}
}
}
Chain = DAG.getCALLSEQ_END(Chain,
DAG.getIntPtrConstant(uniqueCallSite, true),
DAG.getIntPtrConstant(uniqueCallSite+1, true),
InFlag);
uniqueCallSite++;
// set isTailCall to false for now, until we figure out how to express
// tail call optimization in PTX
isTailCall = false;
return Chain;
}
// By default CONCAT_VECTORS is lowered by ExpandVectorBuildThroughStack()
// (see LegalizeDAG.cpp). This is slow and uses local memory.
// We use extract/insert/build vector just as what LegalizeOp() does in llvm 2.5
SDValue NVPTXTargetLowering::
LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const {
SDNode *Node = Op.getNode();
DebugLoc dl = Node->getDebugLoc();
SmallVector<SDValue, 8> Ops;
unsigned NumOperands = Node->getNumOperands();
for (unsigned i=0; i < NumOperands; ++i) {
SDValue SubOp = Node->getOperand(i);
EVT VVT = SubOp.getNode()->getValueType(0);
EVT EltVT = VVT.getVectorElementType();
unsigned NumSubElem = VVT.getVectorNumElements();
for (unsigned j=0; j < NumSubElem; ++j) {
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, SubOp,
DAG.getIntPtrConstant(j)));
}
}
return DAG.getNode(ISD::BUILD_VECTOR, dl, Node->getValueType(0),
&Ops[0], Ops.size());
}
SDValue NVPTXTargetLowering::
LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
case ISD::RETURNADDR: return SDValue();
case ISD::FRAMEADDR: return SDValue();
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::INTRINSIC_W_CHAIN: return Op;
case ISD::BUILD_VECTOR:
case ISD::EXTRACT_SUBVECTOR:
return Op;
case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
default:
llvm_unreachable("Custom lowering not defined for operation");
}
}
SDValue
NVPTXTargetLowering::getExtSymb(SelectionDAG &DAG, const char *inname, int idx,
EVT v) const {
std::string *name = nvTM->getManagedStrPool()->getManagedString(inname);
std::stringstream suffix;
suffix << idx;
*name += suffix.str();
return DAG.getTargetExternalSymbol(name->c_str(), v);
}
SDValue
NVPTXTargetLowering::getParamSymbol(SelectionDAG &DAG, int idx, EVT v) const {
return getExtSymb(DAG, ".PARAM", idx, v);
}
SDValue
NVPTXTargetLowering::getParamHelpSymbol(SelectionDAG &DAG, int idx) {
return getExtSymb(DAG, ".HLPPARAM", idx);
}
// Check to see if the kernel argument is image*_t or sampler_t
bool llvm::isImageOrSamplerVal(const Value *arg, const Module *context) {
static const char *const specialTypes[] = {
"struct._image2d_t",
"struct._image3d_t",
"struct._sampler_t"
};
const Type *Ty = arg->getType();
const PointerType *PTy = dyn_cast<PointerType>(Ty);
if (!PTy)
return false;
if (!context)
return false;
const StructType *STy = dyn_cast<StructType>(PTy->getElementType());
const std::string TypeName = STy ? STy->getName() : "";
for (int i = 0, e = array_lengthof(specialTypes); i != e; ++i)
if (TypeName == specialTypes[i])
return true;
return false;
}
SDValue
NVPTXTargetLowering::LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
MachineFunction &MF = DAG.getMachineFunction();
const TargetData *TD = getTargetData();
const Function *F = MF.getFunction();
const AttrListPtr &PAL = F->getAttributes();
SDValue Root = DAG.getRoot();
std::vector<SDValue> OutChains;
bool isKernel = llvm::isKernelFunction(*F);
bool isABI = (nvptxSubtarget.getSmVersion() >= 20);
std::vector<Type *> argTypes;
std::vector<const Argument *> theArgs;
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I) {
theArgs.push_back(I);
argTypes.push_back(I->getType());
}
assert(argTypes.size() == Ins.size() &&
"Ins types and function types did not match");
int idx = 0;
for (unsigned i=0, e=Ins.size(); i!=e; ++i, ++idx) {
Type *Ty = argTypes[i];
EVT ObjectVT = getValueType(Ty);
assert(ObjectVT == Ins[i].VT &&
"Ins type did not match function type");
// If the kernel argument is image*_t or sampler_t, convert it to
// a i32 constant holding the parameter position. This can later
// matched in the AsmPrinter to output the correct mangled name.
if (isImageOrSamplerVal(theArgs[i],
(theArgs[i]->getParent() ?
theArgs[i]->getParent()->getParent() : 0))) {
assert(isKernel && "Only kernels can have image/sampler params");
InVals.push_back(DAG.getConstant(i+1, MVT::i32));
continue;
}
if (theArgs[i]->use_empty()) {
// argument is dead
InVals.push_back(DAG.getNode(ISD::UNDEF, dl, ObjectVT));
continue;
}
// In the following cases, assign a node order of "idx+1"
// to newly created nodes. The SDNOdes for params have to
// appear in the same order as their order of appearance
// in the original function. "idx+1" holds that order.
if (PAL.paramHasAttr(i+1, Attribute::ByVal) == false) {
// A plain scalar.
if (isABI || isKernel) {
// If ABI, load from the param symbol
SDValue Arg = getParamSymbol(DAG, idx);
Value *srcValue = new Argument(PointerType::get(ObjectVT.getTypeForEVT(
F->getContext()),
llvm::ADDRESS_SPACE_PARAM));
SDValue p = DAG.getLoad(ObjectVT, dl, Root, Arg,
MachinePointerInfo(srcValue), false, false,
false,
TD->getABITypeAlignment(ObjectVT.getTypeForEVT(
F->getContext())));
if (p.getNode())
DAG.AssignOrdering(p.getNode(), idx+1);
InVals.push_back(p);
}
else {
// If no ABI, just move the param symbol
SDValue Arg = getParamSymbol(DAG, idx, ObjectVT);
SDValue p = DAG.getNode(NVPTXISD::MoveParam, dl, ObjectVT, Arg);
if (p.getNode())
DAG.AssignOrdering(p.getNode(), idx+1);
InVals.push_back(p);
}
continue;
}
// Param has ByVal attribute
if (isABI || isKernel) {
// Return MoveParam(param symbol).
// Ideally, the param symbol can be returned directly,
// but when SDNode builder decides to use it in a CopyToReg(),
// machine instruction fails because TargetExternalSymbol
// (not lowered) is target dependent, and CopyToReg assumes
// the source is lowered.
SDValue Arg = getParamSymbol(DAG, idx, getPointerTy());
SDValue p = DAG.getNode(NVPTXISD::MoveParam, dl, ObjectVT, Arg);
if (p.getNode())
DAG.AssignOrdering(p.getNode(), idx+1);
if (isKernel)
InVals.push_back(p);
else {
SDValue p2 = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, ObjectVT,
DAG.getConstant(Intrinsic::nvvm_ptr_local_to_gen, MVT::i32),
p);
InVals.push_back(p2);
}
} else {
// Have to move a set of param symbols to registers and
// store them locally and return the local pointer in InVals
const PointerType *elemPtrType = dyn_cast<PointerType>(argTypes[i]);
assert(elemPtrType &&
"Byval parameter should be a pointer type");
Type *elemType = elemPtrType->getElementType();
// Compute the constituent parts
SmallVector<EVT, 16> vtparts;
SmallVector<uint64_t, 16> offsets;
ComputeValueVTs(*this, elemType, vtparts, &offsets, 0);
unsigned totalsize = 0;
for (unsigned j=0, je=vtparts.size(); j!=je; ++j)
totalsize += vtparts[j].getStoreSizeInBits();
SDValue localcopy = DAG.getFrameIndex(MF.getFrameInfo()->
CreateStackObject(totalsize/8, 16, false),
getPointerTy());
unsigned sizesofar = 0;
std::vector<SDValue> theChains;
for (unsigned j=0, je=vtparts.size(); j!=je; ++j) {
unsigned numElems = 1;
if (vtparts[j].isVector()) numElems = vtparts[j].getVectorNumElements();
for (unsigned k=0, ke=numElems; k!=ke; ++k) {
EVT tmpvt = vtparts[j];
if (tmpvt.isVector()) tmpvt = tmpvt.getVectorElementType();
SDValue arg = DAG.getNode(NVPTXISD::MoveParam, dl, tmpvt,
getParamSymbol(DAG, idx, tmpvt));
SDValue addr = DAG.getNode(ISD::ADD, dl, getPointerTy(), localcopy,
DAG.getConstant(sizesofar, getPointerTy()));
theChains.push_back(DAG.getStore(Chain, dl, arg, addr,
MachinePointerInfo(), false, false, 0));
sizesofar += tmpvt.getStoreSizeInBits()/8;
++idx;
}
}
--idx;
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &theChains[0],
theChains.size());
InVals.push_back(localcopy);
}
}
// Clang will check explicit VarArg and issue error if any. However, Clang
// will let code with
// implicit var arg like f() pass.
// We treat this case as if the arg list is empty.
//if (F.isVarArg()) {
// assert(0 && "VarArg not supported yet!");
//}
if (!OutChains.empty())
DAG.setRoot(DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&OutChains[0], OutChains.size()));
return Chain;
}
SDValue
NVPTXTargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl, SelectionDAG &DAG) const {
bool isABI = (nvptxSubtarget.getSmVersion() >= 20);
unsigned sizesofar = 0;
unsigned idx = 0;
for (unsigned i=0, e=Outs.size(); i!=e; ++i) {
SDValue theVal = OutVals[i];
EVT theValType = theVal.getValueType();
unsigned numElems = 1;
if (theValType.isVector()) numElems = theValType.getVectorNumElements();
for (unsigned j=0,je=numElems; j!=je; ++j) {
SDValue tmpval = theVal;
if (theValType.isVector())
tmpval = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
theValType.getVectorElementType(),
tmpval, DAG.getIntPtrConstant(j));
Chain = DAG.getNode(isABI ? NVPTXISD::StoreRetval :NVPTXISD::MoveToRetval,
dl, MVT::Other,
Chain,
DAG.getConstant(isABI ? sizesofar : idx, MVT::i32),
tmpval);
if (theValType.isVector())
sizesofar += theValType.getVectorElementType().getStoreSizeInBits()/8;
else
sizesofar += theValType.getStoreSizeInBits()/8;
++idx;
}
}
return DAG.getNode(NVPTXISD::RET_FLAG, dl, MVT::Other, Chain);
}
void
NVPTXTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const
{
if (Constraint.length() > 1)
return;
else
TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
}
// NVPTX suuport vector of legal types of any length in Intrinsics because the
// NVPTX specific type legalizer
// will legalize them to the PTX supported length.
bool
NVPTXTargetLowering::isTypeSupportedInIntrinsic(MVT VT) const {
if (isTypeLegal(VT))
return true;
if (VT.isVector()) {
MVT eVT = VT.getVectorElementType();
if (isTypeLegal(eVT))
return true;
}
return false;
}
// llvm.ptx.memcpy.const and llvm.ptx.memmove.const need to be modeled as
// TgtMemIntrinsic
// because we need the information that is only available in the "Value" type
// of destination
// pointer. In particular, the address space information.
bool
NVPTXTargetLowering::getTgtMemIntrinsic(IntrinsicInfo& Info, const CallInst &I,
unsigned Intrinsic) const {
switch (Intrinsic) {
default:
return false;
case Intrinsic::nvvm_atomic_load_add_f32:
Info.opc = ISD::INTRINSIC_W_CHAIN;
Info.memVT = MVT::f32;
Info.ptrVal = I.getArgOperand(0);
Info.offset = 0;
Info.vol = 0;
Info.readMem = true;
Info.writeMem = true;
Info.align = 0;
return true;
case Intrinsic::nvvm_atomic_load_inc_32:
case Intrinsic::nvvm_atomic_load_dec_32:
Info.opc = ISD::INTRINSIC_W_CHAIN;
Info.memVT = MVT::i32;
Info.ptrVal = I.getArgOperand(0);
Info.offset = 0;
Info.vol = 0;
Info.readMem = true;
Info.writeMem = true;
Info.align = 0;
return true;
case Intrinsic::nvvm_ldu_global_i:
case Intrinsic::nvvm_ldu_global_f:
case Intrinsic::nvvm_ldu_global_p:
Info.opc = ISD::INTRINSIC_W_CHAIN;
if (Intrinsic == Intrinsic::nvvm_ldu_global_i)
Info.memVT = MVT::i32;
else if (Intrinsic == Intrinsic::nvvm_ldu_global_p)
Info.memVT = getPointerTy();
else
Info.memVT = MVT::f32;
Info.ptrVal = I.getArgOperand(0);
Info.offset = 0;
Info.vol = 0;
Info.readMem = true;
Info.writeMem = false;
Info.align = 0;
return true;
}
return false;
}
/// isLegalAddressingMode - Return true if the addressing mode represented
/// by AM is legal for this target, for a load/store of the specified type.
/// Used to guide target specific optimizations, like loop strength reduction
/// (LoopStrengthReduce.cpp) and memory optimization for address mode
/// (CodeGenPrepare.cpp)
bool
NVPTXTargetLowering::isLegalAddressingMode(const AddrMode &AM,
Type *Ty) const {
// AddrMode - This represents an addressing mode of:
// BaseGV + BaseOffs + BaseReg + Scale*ScaleReg
//
// The legal address modes are
// - [avar]
// - [areg]
// - [areg+immoff]
// - [immAddr]
if (AM.BaseGV) {
if (AM.BaseOffs || AM.HasBaseReg || AM.Scale)
return false;
return true;
}
switch (AM.Scale) {
case 0: // "r", "r+i" or "i" is allowed
break;
case 1:
if (AM.HasBaseReg) // "r+r+i" or "r+r" is not allowed.
return false;
// Otherwise we have r+i.
break;
default:
// No scale > 1 is allowed
return false;
}
return true;
}
//===----------------------------------------------------------------------===//
// NVPTX Inline Assembly Support
//===----------------------------------------------------------------------===//
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
NVPTXTargetLowering::ConstraintType
NVPTXTargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default:
break;
case 'r':
case 'h':
case 'c':
case 'l':
case 'f':
case 'd':
case '0':
case 'N':
return C_RegisterClass;
}
}
return TargetLowering::getConstraintType(Constraint);
}
std::pair<unsigned, const TargetRegisterClass*>
NVPTXTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
case 'c':
return std::make_pair(0U, &NVPTX::Int8RegsRegClass);
case 'h':
return std::make_pair(0U, &NVPTX::Int16RegsRegClass);
case 'r':
return std::make_pair(0U, &NVPTX::Int32RegsRegClass);
case 'l':
case 'N':
return std::make_pair(0U, &NVPTX::Int64RegsRegClass);
case 'f':
return std::make_pair(0U, &NVPTX::Float32RegsRegClass);
case 'd':
return std::make_pair(0U, &NVPTX::Float64RegsRegClass);
}
}
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
/// getFunctionAlignment - Return the Log2 alignment of this function.
unsigned NVPTXTargetLowering::getFunctionAlignment(const Function *) const {
return 4;
}
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