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llvm-mirror/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
Nicolás Alvarez 0bad578cf3 [docs] Fix doxygen comments wrongly attached to the llvm namespace 
Looking at the Doxygen-generated documentation for the llvm namespace
currently shows all sorts of random comments from different parts of the
codebase. These are mostly caused by:

- File doc comments that aren't marked with \file, so they're attached to
  the next declaration, which is usually "namespace llvm {".
- Class doc comments placed before the namespace rather than before the
  class.
- Code comments before the namespace that (in my opinion) shouldn't be
  extracted by doxygen at all.

This commit fixes these comments. The generated doxygen documentation now
has proper docs for several classes and files, and the docs for the llvm
and llvm::detail namespaces are now empty.

Reviewed By: thakis, mizvekov

Differential Revision: https://reviews.llvm.org/D96736
2021-04-07 01:20:18 +02:00

2313 lines
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//===-- HexagonISelDAGToDAG.cpp - A dag to dag inst selector for Hexagon --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the Hexagon target.
//
//===----------------------------------------------------------------------===//
#include "HexagonISelDAGToDAG.h"
#include "Hexagon.h"
#include "HexagonISelLowering.h"
#include "HexagonMachineFunctionInfo.h"
#include "HexagonTargetMachine.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsHexagon.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
#define DEBUG_TYPE "hexagon-isel"
static
cl::opt<bool>
EnableAddressRebalancing("isel-rebalance-addr", cl::Hidden, cl::init(true),
cl::desc("Rebalance address calculation trees to improve "
"instruction selection"));
// Rebalance only if this allows e.g. combining a GA with an offset or
// factoring out a shift.
static
cl::opt<bool>
RebalanceOnlyForOptimizations("rebalance-only-opt", cl::Hidden, cl::init(false),
cl::desc("Rebalance address tree only if this allows optimizations"));
static
cl::opt<bool>
RebalanceOnlyImbalancedTrees("rebalance-only-imbal", cl::Hidden,
cl::init(false), cl::desc("Rebalance address tree only if it is imbalanced"));
static cl::opt<bool> CheckSingleUse("hexagon-isel-su", cl::Hidden,
cl::init(true), cl::desc("Enable checking of SDNode's single-use status"));
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
#define GET_DAGISEL_BODY HexagonDAGToDAGISel
#include "HexagonGenDAGISel.inc"
namespace llvm {
/// createHexagonISelDag - This pass converts a legalized DAG into a
/// Hexagon-specific DAG, ready for instruction scheduling.
FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
CodeGenOpt::Level OptLevel) {
return new HexagonDAGToDAGISel(TM, OptLevel);
}
}
void HexagonDAGToDAGISel::SelectIndexedLoad(LoadSDNode *LD, const SDLoc &dl) {
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Offset = LD->getOffset();
int32_t Inc = cast<ConstantSDNode>(Offset.getNode())->getSExtValue();
EVT LoadedVT = LD->getMemoryVT();
unsigned Opcode = 0;
// Check for zero extended loads. Treat any-extend loads as zero extended
// loads.
ISD::LoadExtType ExtType = LD->getExtensionType();
bool IsZeroExt = (ExtType == ISD::ZEXTLOAD || ExtType == ISD::EXTLOAD);
bool IsValidInc = HII->isValidAutoIncImm(LoadedVT, Inc);
assert(LoadedVT.isSimple());
switch (LoadedVT.getSimpleVT().SimpleTy) {
case MVT::i8:
if (IsZeroExt)
Opcode = IsValidInc ? Hexagon::L2_loadrub_pi : Hexagon::L2_loadrub_io;
else
Opcode = IsValidInc ? Hexagon::L2_loadrb_pi : Hexagon::L2_loadrb_io;
break;
case MVT::i16:
if (IsZeroExt)
Opcode = IsValidInc ? Hexagon::L2_loadruh_pi : Hexagon::L2_loadruh_io;
else
Opcode = IsValidInc ? Hexagon::L2_loadrh_pi : Hexagon::L2_loadrh_io;
break;
case MVT::i32:
case MVT::f32:
case MVT::v2i16:
case MVT::v4i8:
Opcode = IsValidInc ? Hexagon::L2_loadri_pi : Hexagon::L2_loadri_io;
break;
case MVT::i64:
case MVT::f64:
case MVT::v2i32:
case MVT::v4i16:
case MVT::v8i8:
Opcode = IsValidInc ? Hexagon::L2_loadrd_pi : Hexagon::L2_loadrd_io;
break;
case MVT::v64i8:
case MVT::v32i16:
case MVT::v16i32:
case MVT::v8i64:
case MVT::v128i8:
case MVT::v64i16:
case MVT::v32i32:
case MVT::v16i64:
if (isAlignedMemNode(LD)) {
if (LD->isNonTemporal())
Opcode = IsValidInc ? Hexagon::V6_vL32b_nt_pi : Hexagon::V6_vL32b_nt_ai;
else
Opcode = IsValidInc ? Hexagon::V6_vL32b_pi : Hexagon::V6_vL32b_ai;
} else {
Opcode = IsValidInc ? Hexagon::V6_vL32Ub_pi : Hexagon::V6_vL32Ub_ai;
}
break;
default:
llvm_unreachable("Unexpected memory type in indexed load");
}
SDValue IncV = CurDAG->getTargetConstant(Inc, dl, MVT::i32);
MachineMemOperand *MemOp = LD->getMemOperand();
auto getExt64 = [this,ExtType] (MachineSDNode *N, const SDLoc &dl)
-> MachineSDNode* {
if (ExtType == ISD::ZEXTLOAD || ExtType == ISD::EXTLOAD) {
SDValue Zero = CurDAG->getTargetConstant(0, dl, MVT::i32);
return CurDAG->getMachineNode(Hexagon::A4_combineir, dl, MVT::i64,
Zero, SDValue(N, 0));
}
if (ExtType == ISD::SEXTLOAD)
return CurDAG->getMachineNode(Hexagon::A2_sxtw, dl, MVT::i64,
SDValue(N, 0));
return N;
};
// Loaded value Next address Chain
SDValue From[3] = { SDValue(LD,0), SDValue(LD,1), SDValue(LD,2) };
SDValue To[3];
EVT ValueVT = LD->getValueType(0);
if (ValueVT == MVT::i64 && ExtType != ISD::NON_EXTLOAD) {
// A load extending to i64 will actually produce i32, which will then
// need to be extended to i64.
assert(LoadedVT.getSizeInBits() <= 32);
ValueVT = MVT::i32;
}
if (IsValidInc) {
MachineSDNode *L = CurDAG->getMachineNode(Opcode, dl, ValueVT,
MVT::i32, MVT::Other, Base,
IncV, Chain);
CurDAG->setNodeMemRefs(L, {MemOp});
To[1] = SDValue(L, 1); // Next address.
To[2] = SDValue(L, 2); // Chain.
// Handle special case for extension to i64.
if (LD->getValueType(0) == MVT::i64)
L = getExt64(L, dl);
To[0] = SDValue(L, 0); // Loaded (extended) value.
} else {
SDValue Zero = CurDAG->getTargetConstant(0, dl, MVT::i32);
MachineSDNode *L = CurDAG->getMachineNode(Opcode, dl, ValueVT, MVT::Other,
Base, Zero, Chain);
CurDAG->setNodeMemRefs(L, {MemOp});
To[2] = SDValue(L, 1); // Chain.
MachineSDNode *A = CurDAG->getMachineNode(Hexagon::A2_addi, dl, MVT::i32,
Base, IncV);
To[1] = SDValue(A, 0); // Next address.
// Handle special case for extension to i64.
if (LD->getValueType(0) == MVT::i64)
L = getExt64(L, dl);
To[0] = SDValue(L, 0); // Loaded (extended) value.
}
ReplaceUses(From, To, 3);
CurDAG->RemoveDeadNode(LD);
}
MachineSDNode *HexagonDAGToDAGISel::LoadInstrForLoadIntrinsic(SDNode *IntN) {
if (IntN->getOpcode() != ISD::INTRINSIC_W_CHAIN)
return nullptr;
SDLoc dl(IntN);
unsigned IntNo = cast<ConstantSDNode>(IntN->getOperand(1))->getZExtValue();
static std::map<unsigned,unsigned> LoadPciMap = {
{ Intrinsic::hexagon_circ_ldb, Hexagon::L2_loadrb_pci },
{ Intrinsic::hexagon_circ_ldub, Hexagon::L2_loadrub_pci },
{ Intrinsic::hexagon_circ_ldh, Hexagon::L2_loadrh_pci },
{ Intrinsic::hexagon_circ_lduh, Hexagon::L2_loadruh_pci },
{ Intrinsic::hexagon_circ_ldw, Hexagon::L2_loadri_pci },
{ Intrinsic::hexagon_circ_ldd, Hexagon::L2_loadrd_pci },
};
auto FLC = LoadPciMap.find(IntNo);
if (FLC != LoadPciMap.end()) {
EVT ValTy = (IntNo == Intrinsic::hexagon_circ_ldd) ? MVT::i64 : MVT::i32;
EVT RTys[] = { ValTy, MVT::i32, MVT::Other };
// Operands: { Base, Increment, Modifier, Chain }
auto Inc = cast<ConstantSDNode>(IntN->getOperand(5));
SDValue I = CurDAG->getTargetConstant(Inc->getSExtValue(), dl, MVT::i32);
MachineSDNode *Res = CurDAG->getMachineNode(FLC->second, dl, RTys,
{ IntN->getOperand(2), I, IntN->getOperand(4),
IntN->getOperand(0) });
return Res;
}
return nullptr;
}
SDNode *HexagonDAGToDAGISel::StoreInstrForLoadIntrinsic(MachineSDNode *LoadN,
SDNode *IntN) {
// The "LoadN" is just a machine load instruction. The intrinsic also
// involves storing it. Generate an appropriate store to the location
// given in the intrinsic's operand(3).
uint64_t F = HII->get(LoadN->getMachineOpcode()).TSFlags;
unsigned SizeBits = (F >> HexagonII::MemAccessSizePos) &
HexagonII::MemAccesSizeMask;
unsigned Size = 1U << (SizeBits-1);
SDLoc dl(IntN);
MachinePointerInfo PI;
SDValue TS;
SDValue Loc = IntN->getOperand(3);
if (Size >= 4)
TS = CurDAG->getStore(SDValue(LoadN, 2), dl, SDValue(LoadN, 0), Loc, PI,
Align(Size));
else
TS = CurDAG->getTruncStore(SDValue(LoadN, 2), dl, SDValue(LoadN, 0), Loc,
PI, MVT::getIntegerVT(Size * 8), Align(Size));
SDNode *StoreN;
{
HandleSDNode Handle(TS);
SelectStore(TS.getNode());
StoreN = Handle.getValue().getNode();
}
// Load's results are { Loaded value, Updated pointer, Chain }
ReplaceUses(SDValue(IntN, 0), SDValue(LoadN, 1));
ReplaceUses(SDValue(IntN, 1), SDValue(StoreN, 0));
return StoreN;
}
bool HexagonDAGToDAGISel::tryLoadOfLoadIntrinsic(LoadSDNode *N) {
// The intrinsics for load circ/brev perform two operations:
// 1. Load a value V from the specified location, using the addressing
// mode corresponding to the intrinsic.
// 2. Store V into a specified location. This location is typically a
// local, temporary object.
// In many cases, the program using these intrinsics will immediately
// load V again from the local object. In those cases, when certain
// conditions are met, the last load can be removed.
// This function identifies and optimizes this pattern. If the pattern
// cannot be optimized, it returns nullptr, which will cause the load
// to be selected separately from the intrinsic (which will be handled
// in SelectIntrinsicWChain).
SDValue Ch = N->getOperand(0);
SDValue Loc = N->getOperand(1);
// Assume that the load and the intrinsic are connected directly with a
// chain:
// t1: i32,ch = int.load ..., ..., ..., Loc, ... // <-- C
// t2: i32,ch = load t1:1, Loc, ...
SDNode *C = Ch.getNode();
if (C->getOpcode() != ISD::INTRINSIC_W_CHAIN)
return false;
// The second load can only be eliminated if its extension type matches
// that of the load instruction corresponding to the intrinsic. The user
// can provide an address of an unsigned variable to store the result of
// a sign-extending intrinsic into (or the other way around).
ISD::LoadExtType IntExt;
switch (cast<ConstantSDNode>(C->getOperand(1))->getZExtValue()) {
case Intrinsic::hexagon_circ_ldub:
case Intrinsic::hexagon_circ_lduh:
IntExt = ISD::ZEXTLOAD;
break;
case Intrinsic::hexagon_circ_ldw:
case Intrinsic::hexagon_circ_ldd:
IntExt = ISD::NON_EXTLOAD;
break;
default:
IntExt = ISD::SEXTLOAD;
break;
}
if (N->getExtensionType() != IntExt)
return false;
// Make sure the target location for the loaded value in the load intrinsic
// is the location from which LD (or N) is loading.
if (C->getNumOperands() < 4 || Loc.getNode() != C->getOperand(3).getNode())
return false;
if (MachineSDNode *L = LoadInstrForLoadIntrinsic(C)) {
SDNode *S = StoreInstrForLoadIntrinsic(L, C);
SDValue F[] = { SDValue(N,0), SDValue(N,1), SDValue(C,0), SDValue(C,1) };
SDValue T[] = { SDValue(L,0), SDValue(S,0), SDValue(L,1), SDValue(S,0) };
ReplaceUses(F, T, array_lengthof(T));
// This transformation will leave the intrinsic dead. If it remains in
// the DAG, the selection code will see it again, but without the load,
// and it will generate a store that is normally required for it.
CurDAG->RemoveDeadNode(C);
return true;
}
return false;
}
// Convert the bit-reverse load intrinsic to appropriate target instruction.
bool HexagonDAGToDAGISel::SelectBrevLdIntrinsic(SDNode *IntN) {
if (IntN->getOpcode() != ISD::INTRINSIC_W_CHAIN)
return false;
const SDLoc &dl(IntN);
unsigned IntNo = cast<ConstantSDNode>(IntN->getOperand(1))->getZExtValue();
static const std::map<unsigned, unsigned> LoadBrevMap = {
{ Intrinsic::hexagon_L2_loadrb_pbr, Hexagon::L2_loadrb_pbr },
{ Intrinsic::hexagon_L2_loadrub_pbr, Hexagon::L2_loadrub_pbr },
{ Intrinsic::hexagon_L2_loadrh_pbr, Hexagon::L2_loadrh_pbr },
{ Intrinsic::hexagon_L2_loadruh_pbr, Hexagon::L2_loadruh_pbr },
{ Intrinsic::hexagon_L2_loadri_pbr, Hexagon::L2_loadri_pbr },
{ Intrinsic::hexagon_L2_loadrd_pbr, Hexagon::L2_loadrd_pbr }
};
auto FLI = LoadBrevMap.find(IntNo);
if (FLI != LoadBrevMap.end()) {
EVT ValTy =
(IntNo == Intrinsic::hexagon_L2_loadrd_pbr) ? MVT::i64 : MVT::i32;
EVT RTys[] = { ValTy, MVT::i32, MVT::Other };
// Operands of Intrinsic: {chain, enum ID of intrinsic, baseptr,
// modifier}.
// Operands of target instruction: { Base, Modifier, Chain }.
MachineSDNode *Res = CurDAG->getMachineNode(
FLI->second, dl, RTys,
{IntN->getOperand(2), IntN->getOperand(3), IntN->getOperand(0)});
MachineMemOperand *MemOp = cast<MemIntrinsicSDNode>(IntN)->getMemOperand();
CurDAG->setNodeMemRefs(Res, {MemOp});
ReplaceUses(SDValue(IntN, 0), SDValue(Res, 0));
ReplaceUses(SDValue(IntN, 1), SDValue(Res, 1));
ReplaceUses(SDValue(IntN, 2), SDValue(Res, 2));
CurDAG->RemoveDeadNode(IntN);
return true;
}
return false;
}
/// Generate a machine instruction node for the new circlar buffer intrinsics.
/// The new versions use a CSx register instead of the K field.
bool HexagonDAGToDAGISel::SelectNewCircIntrinsic(SDNode *IntN) {
if (IntN->getOpcode() != ISD::INTRINSIC_W_CHAIN)
return false;
SDLoc DL(IntN);
unsigned IntNo = cast<ConstantSDNode>(IntN->getOperand(1))->getZExtValue();
SmallVector<SDValue, 7> Ops;
static std::map<unsigned,unsigned> LoadNPcMap = {
{ Intrinsic::hexagon_L2_loadrub_pci, Hexagon::PS_loadrub_pci },
{ Intrinsic::hexagon_L2_loadrb_pci, Hexagon::PS_loadrb_pci },
{ Intrinsic::hexagon_L2_loadruh_pci, Hexagon::PS_loadruh_pci },
{ Intrinsic::hexagon_L2_loadrh_pci, Hexagon::PS_loadrh_pci },
{ Intrinsic::hexagon_L2_loadri_pci, Hexagon::PS_loadri_pci },
{ Intrinsic::hexagon_L2_loadrd_pci, Hexagon::PS_loadrd_pci },
{ Intrinsic::hexagon_L2_loadrub_pcr, Hexagon::PS_loadrub_pcr },
{ Intrinsic::hexagon_L2_loadrb_pcr, Hexagon::PS_loadrb_pcr },
{ Intrinsic::hexagon_L2_loadruh_pcr, Hexagon::PS_loadruh_pcr },
{ Intrinsic::hexagon_L2_loadrh_pcr, Hexagon::PS_loadrh_pcr },
{ Intrinsic::hexagon_L2_loadri_pcr, Hexagon::PS_loadri_pcr },
{ Intrinsic::hexagon_L2_loadrd_pcr, Hexagon::PS_loadrd_pcr }
};
auto FLI = LoadNPcMap.find (IntNo);
if (FLI != LoadNPcMap.end()) {
EVT ValTy = MVT::i32;
if (IntNo == Intrinsic::hexagon_L2_loadrd_pci ||
IntNo == Intrinsic::hexagon_L2_loadrd_pcr)
ValTy = MVT::i64;
EVT RTys[] = { ValTy, MVT::i32, MVT::Other };
// Handle load.*_pci case which has 6 operands.
if (IntN->getNumOperands() == 6) {
auto Inc = cast<ConstantSDNode>(IntN->getOperand(3));
SDValue I = CurDAG->getTargetConstant(Inc->getSExtValue(), DL, MVT::i32);
// Operands: { Base, Increment, Modifier, Start, Chain }.
Ops = { IntN->getOperand(2), I, IntN->getOperand(4), IntN->getOperand(5),
IntN->getOperand(0) };
} else
// Handle load.*_pcr case which has 5 operands.
// Operands: { Base, Modifier, Start, Chain }.
Ops = { IntN->getOperand(2), IntN->getOperand(3), IntN->getOperand(4),
IntN->getOperand(0) };
MachineSDNode *Res = CurDAG->getMachineNode(FLI->second, DL, RTys, Ops);
ReplaceUses(SDValue(IntN, 0), SDValue(Res, 0));
ReplaceUses(SDValue(IntN, 1), SDValue(Res, 1));
ReplaceUses(SDValue(IntN, 2), SDValue(Res, 2));
CurDAG->RemoveDeadNode(IntN);
return true;
}
static std::map<unsigned,unsigned> StoreNPcMap = {
{ Intrinsic::hexagon_S2_storerb_pci, Hexagon::PS_storerb_pci },
{ Intrinsic::hexagon_S2_storerh_pci, Hexagon::PS_storerh_pci },
{ Intrinsic::hexagon_S2_storerf_pci, Hexagon::PS_storerf_pci },
{ Intrinsic::hexagon_S2_storeri_pci, Hexagon::PS_storeri_pci },
{ Intrinsic::hexagon_S2_storerd_pci, Hexagon::PS_storerd_pci },
{ Intrinsic::hexagon_S2_storerb_pcr, Hexagon::PS_storerb_pcr },
{ Intrinsic::hexagon_S2_storerh_pcr, Hexagon::PS_storerh_pcr },
{ Intrinsic::hexagon_S2_storerf_pcr, Hexagon::PS_storerf_pcr },
{ Intrinsic::hexagon_S2_storeri_pcr, Hexagon::PS_storeri_pcr },
{ Intrinsic::hexagon_S2_storerd_pcr, Hexagon::PS_storerd_pcr }
};
auto FSI = StoreNPcMap.find (IntNo);
if (FSI != StoreNPcMap.end()) {
EVT RTys[] = { MVT::i32, MVT::Other };
// Handle store.*_pci case which has 7 operands.
if (IntN->getNumOperands() == 7) {
auto Inc = cast<ConstantSDNode>(IntN->getOperand(3));
SDValue I = CurDAG->getTargetConstant(Inc->getSExtValue(), DL, MVT::i32);
// Operands: { Base, Increment, Modifier, Value, Start, Chain }.
Ops = { IntN->getOperand(2), I, IntN->getOperand(4), IntN->getOperand(5),
IntN->getOperand(6), IntN->getOperand(0) };
} else
// Handle store.*_pcr case which has 6 operands.
// Operands: { Base, Modifier, Value, Start, Chain }.
Ops = { IntN->getOperand(2), IntN->getOperand(3), IntN->getOperand(4),
IntN->getOperand(5), IntN->getOperand(0) };
MachineSDNode *Res = CurDAG->getMachineNode(FSI->second, DL, RTys, Ops);
ReplaceUses(SDValue(IntN, 0), SDValue(Res, 0));
ReplaceUses(SDValue(IntN, 1), SDValue(Res, 1));
CurDAG->RemoveDeadNode(IntN);
return true;
}
return false;
}
void HexagonDAGToDAGISel::SelectLoad(SDNode *N) {
SDLoc dl(N);
LoadSDNode *LD = cast<LoadSDNode>(N);
// Handle indexed loads.
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM != ISD::UNINDEXED) {
SelectIndexedLoad(LD, dl);
return;
}
// Handle patterns using circ/brev load intrinsics.
if (tryLoadOfLoadIntrinsic(LD))
return;
SelectCode(LD);
}
void HexagonDAGToDAGISel::SelectIndexedStore(StoreSDNode *ST, const SDLoc &dl) {
SDValue Chain = ST->getChain();
SDValue Base = ST->getBasePtr();
SDValue Offset = ST->getOffset();
SDValue Value = ST->getValue();
// Get the constant value.
int32_t Inc = cast<ConstantSDNode>(Offset.getNode())->getSExtValue();
EVT StoredVT = ST->getMemoryVT();
EVT ValueVT = Value.getValueType();
bool IsValidInc = HII->isValidAutoIncImm(StoredVT, Inc);
unsigned Opcode = 0;
assert(StoredVT.isSimple());
switch (StoredVT.getSimpleVT().SimpleTy) {
case MVT::i8:
Opcode = IsValidInc ? Hexagon::S2_storerb_pi : Hexagon::S2_storerb_io;
break;
case MVT::i16:
Opcode = IsValidInc ? Hexagon::S2_storerh_pi : Hexagon::S2_storerh_io;
break;
case MVT::i32:
case MVT::f32:
case MVT::v2i16:
case MVT::v4i8:
Opcode = IsValidInc ? Hexagon::S2_storeri_pi : Hexagon::S2_storeri_io;
break;
case MVT::i64:
case MVT::f64:
case MVT::v2i32:
case MVT::v4i16:
case MVT::v8i8:
Opcode = IsValidInc ? Hexagon::S2_storerd_pi : Hexagon::S2_storerd_io;
break;
case MVT::v64i8:
case MVT::v32i16:
case MVT::v16i32:
case MVT::v8i64:
case MVT::v128i8:
case MVT::v64i16:
case MVT::v32i32:
case MVT::v16i64:
if (isAlignedMemNode(ST)) {
if (ST->isNonTemporal())
Opcode = IsValidInc ? Hexagon::V6_vS32b_nt_pi : Hexagon::V6_vS32b_nt_ai;
else
Opcode = IsValidInc ? Hexagon::V6_vS32b_pi : Hexagon::V6_vS32b_ai;
} else {
Opcode = IsValidInc ? Hexagon::V6_vS32Ub_pi : Hexagon::V6_vS32Ub_ai;
}
break;
default:
llvm_unreachable("Unexpected memory type in indexed store");
}
if (ST->isTruncatingStore() && ValueVT.getSizeInBits() == 64) {
assert(StoredVT.getSizeInBits() < 64 && "Not a truncating store");
Value = CurDAG->getTargetExtractSubreg(Hexagon::isub_lo,
dl, MVT::i32, Value);
}
SDValue IncV = CurDAG->getTargetConstant(Inc, dl, MVT::i32);
MachineMemOperand *MemOp = ST->getMemOperand();
// Next address Chain
SDValue From[2] = { SDValue(ST,0), SDValue(ST,1) };
SDValue To[2];
if (IsValidInc) {
// Build post increment store.
SDValue Ops[] = { Base, IncV, Value, Chain };
MachineSDNode *S = CurDAG->getMachineNode(Opcode, dl, MVT::i32, MVT::Other,
Ops);
CurDAG->setNodeMemRefs(S, {MemOp});
To[0] = SDValue(S, 0);
To[1] = SDValue(S, 1);
} else {
SDValue Zero = CurDAG->getTargetConstant(0, dl, MVT::i32);
SDValue Ops[] = { Base, Zero, Value, Chain };
MachineSDNode *S = CurDAG->getMachineNode(Opcode, dl, MVT::Other, Ops);
CurDAG->setNodeMemRefs(S, {MemOp});
To[1] = SDValue(S, 0);
MachineSDNode *A = CurDAG->getMachineNode(Hexagon::A2_addi, dl, MVT::i32,
Base, IncV);
To[0] = SDValue(A, 0);
}
ReplaceUses(From, To, 2);
CurDAG->RemoveDeadNode(ST);
}
void HexagonDAGToDAGISel::SelectStore(SDNode *N) {
SDLoc dl(N);
StoreSDNode *ST = cast<StoreSDNode>(N);
// Handle indexed stores.
ISD::MemIndexedMode AM = ST->getAddressingMode();
if (AM != ISD::UNINDEXED) {
SelectIndexedStore(ST, dl);
return;
}
SelectCode(ST);
}
void HexagonDAGToDAGISel::SelectSHL(SDNode *N) {
SDLoc dl(N);
SDValue Shl_0 = N->getOperand(0);
SDValue Shl_1 = N->getOperand(1);
auto Default = [this,N] () -> void { SelectCode(N); };
if (N->getValueType(0) != MVT::i32 || Shl_1.getOpcode() != ISD::Constant)
return Default();
// RHS is const.
int32_t ShlConst = cast<ConstantSDNode>(Shl_1)->getSExtValue();
if (Shl_0.getOpcode() == ISD::MUL) {
SDValue Mul_0 = Shl_0.getOperand(0); // Val
SDValue Mul_1 = Shl_0.getOperand(1); // Const
// RHS of mul is const.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Mul_1)) {
int32_t ValConst = C->getSExtValue() << ShlConst;
if (isInt<9>(ValConst)) {
SDValue Val = CurDAG->getTargetConstant(ValConst, dl, MVT::i32);
SDNode *Result = CurDAG->getMachineNode(Hexagon::M2_mpysmi, dl,
MVT::i32, Mul_0, Val);
ReplaceNode(N, Result);
return;
}
}
return Default();
}
if (Shl_0.getOpcode() == ISD::SUB) {
SDValue Sub_0 = Shl_0.getOperand(0); // Const 0
SDValue Sub_1 = Shl_0.getOperand(1); // Val
if (ConstantSDNode *C1 = dyn_cast<ConstantSDNode>(Sub_0)) {
if (C1->getSExtValue() != 0 || Sub_1.getOpcode() != ISD::SHL)
return Default();
SDValue Shl2_0 = Sub_1.getOperand(0); // Val
SDValue Shl2_1 = Sub_1.getOperand(1); // Const
if (ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(Shl2_1)) {
int32_t ValConst = 1 << (ShlConst + C2->getSExtValue());
if (isInt<9>(-ValConst)) {
SDValue Val = CurDAG->getTargetConstant(-ValConst, dl, MVT::i32);
SDNode *Result = CurDAG->getMachineNode(Hexagon::M2_mpysmi, dl,
MVT::i32, Shl2_0, Val);
ReplaceNode(N, Result);
return;
}
}
}
}
return Default();
}
//
// Handling intrinsics for circular load and bitreverse load.
//
void HexagonDAGToDAGISel::SelectIntrinsicWChain(SDNode *N) {
if (MachineSDNode *L = LoadInstrForLoadIntrinsic(N)) {
StoreInstrForLoadIntrinsic(L, N);
CurDAG->RemoveDeadNode(N);
return;
}
// Handle bit-reverse load intrinsics.
if (SelectBrevLdIntrinsic(N))
return;
if (SelectNewCircIntrinsic(N))
return;
unsigned IntNo = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
if (IntNo == Intrinsic::hexagon_V6_vgathermw ||
IntNo == Intrinsic::hexagon_V6_vgathermw_128B ||
IntNo == Intrinsic::hexagon_V6_vgathermh ||
IntNo == Intrinsic::hexagon_V6_vgathermh_128B ||
IntNo == Intrinsic::hexagon_V6_vgathermhw ||
IntNo == Intrinsic::hexagon_V6_vgathermhw_128B) {
SelectV65Gather(N);
return;
}
if (IntNo == Intrinsic::hexagon_V6_vgathermwq ||
IntNo == Intrinsic::hexagon_V6_vgathermwq_128B ||
IntNo == Intrinsic::hexagon_V6_vgathermhq ||
IntNo == Intrinsic::hexagon_V6_vgathermhq_128B ||
IntNo == Intrinsic::hexagon_V6_vgathermhwq ||
IntNo == Intrinsic::hexagon_V6_vgathermhwq_128B) {
SelectV65GatherPred(N);
return;
}
SelectCode(N);
}
void HexagonDAGToDAGISel::SelectIntrinsicWOChain(SDNode *N) {
unsigned IID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
unsigned Bits;
switch (IID) {
case Intrinsic::hexagon_S2_vsplatrb:
Bits = 8;
break;
case Intrinsic::hexagon_S2_vsplatrh:
Bits = 16;
break;
case Intrinsic::hexagon_V6_vaddcarry:
case Intrinsic::hexagon_V6_vaddcarry_128B:
case Intrinsic::hexagon_V6_vsubcarry:
case Intrinsic::hexagon_V6_vsubcarry_128B:
SelectHVXDualOutput(N);
return;
default:
SelectCode(N);
return;
}
SDValue V = N->getOperand(1);
SDValue U;
if (keepsLowBits(V, Bits, U)) {
SDValue R = CurDAG->getNode(N->getOpcode(), SDLoc(N), N->getValueType(0),
N->getOperand(0), U);
ReplaceNode(N, R.getNode());
SelectCode(R.getNode());
return;
}
SelectCode(N);
}
//
// Map floating point constant values.
//
void HexagonDAGToDAGISel::SelectConstantFP(SDNode *N) {
SDLoc dl(N);
auto *CN = cast<ConstantFPSDNode>(N);
APInt A = CN->getValueAPF().bitcastToAPInt();
if (N->getValueType(0) == MVT::f32) {
SDValue V = CurDAG->getTargetConstant(A.getZExtValue(), dl, MVT::i32);
ReplaceNode(N, CurDAG->getMachineNode(Hexagon::A2_tfrsi, dl, MVT::f32, V));
return;
}
if (N->getValueType(0) == MVT::f64) {
SDValue V = CurDAG->getTargetConstant(A.getZExtValue(), dl, MVT::i64);
ReplaceNode(N, CurDAG->getMachineNode(Hexagon::CONST64, dl, MVT::f64, V));
return;
}
SelectCode(N);
}
//
// Map boolean values.
//
void HexagonDAGToDAGISel::SelectConstant(SDNode *N) {
if (N->getValueType(0) == MVT::i1) {
assert(!(cast<ConstantSDNode>(N)->getZExtValue() >> 1));
unsigned Opc = (cast<ConstantSDNode>(N)->getSExtValue() != 0)
? Hexagon::PS_true
: Hexagon::PS_false;
ReplaceNode(N, CurDAG->getMachineNode(Opc, SDLoc(N), MVT::i1));
return;
}
SelectCode(N);
}
void HexagonDAGToDAGISel::SelectFrameIndex(SDNode *N) {
MachineFrameInfo &MFI = MF->getFrameInfo();
const HexagonFrameLowering *HFI = HST->getFrameLowering();
int FX = cast<FrameIndexSDNode>(N)->getIndex();
Align StkA = HFI->getStackAlign();
Align MaxA = MFI.getMaxAlign();
SDValue FI = CurDAG->getTargetFrameIndex(FX, MVT::i32);
SDLoc DL(N);
SDValue Zero = CurDAG->getTargetConstant(0, DL, MVT::i32);
SDNode *R = nullptr;
// Use PS_fi when:
// - the object is fixed, or
// - there are no objects with higher-than-default alignment, or
// - there are no dynamically allocated objects.
// Otherwise, use PS_fia.
if (FX < 0 || MaxA <= StkA || !MFI.hasVarSizedObjects()) {
R = CurDAG->getMachineNode(Hexagon::PS_fi, DL, MVT::i32, FI, Zero);
} else {
auto &HMFI = *MF->getInfo<HexagonMachineFunctionInfo>();
unsigned AR = HMFI.getStackAlignBaseVReg();
SDValue CH = CurDAG->getEntryNode();
SDValue Ops[] = { CurDAG->getCopyFromReg(CH, DL, AR, MVT::i32), FI, Zero };
R = CurDAG->getMachineNode(Hexagon::PS_fia, DL, MVT::i32, Ops);
}
ReplaceNode(N, R);
}
void HexagonDAGToDAGISel::SelectAddSubCarry(SDNode *N) {
unsigned OpcCarry = N->getOpcode() == HexagonISD::ADDC ? Hexagon::A4_addp_c
: Hexagon::A4_subp_c;
SDNode *C = CurDAG->getMachineNode(OpcCarry, SDLoc(N), N->getVTList(),
{ N->getOperand(0), N->getOperand(1),
N->getOperand(2) });
ReplaceNode(N, C);
}
void HexagonDAGToDAGISel::SelectVAlign(SDNode *N) {
MVT ResTy = N->getValueType(0).getSimpleVT();
if (HST->isHVXVectorType(ResTy, true))
return SelectHvxVAlign(N);
const SDLoc &dl(N);
unsigned VecLen = ResTy.getSizeInBits();
if (VecLen == 32) {
SDValue Ops[] = {
CurDAG->getTargetConstant(Hexagon::DoubleRegsRegClassID, dl, MVT::i32),
N->getOperand(0),
CurDAG->getTargetConstant(Hexagon::isub_hi, dl, MVT::i32),
N->getOperand(1),
CurDAG->getTargetConstant(Hexagon::isub_lo, dl, MVT::i32)
};
SDNode *R = CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl,
MVT::i64, Ops);
// Shift right by "(Addr & 0x3) * 8" bytes.
SDNode *C;
SDValue M0 = CurDAG->getTargetConstant(0x18, dl, MVT::i32);
SDValue M1 = CurDAG->getTargetConstant(0x03, dl, MVT::i32);
if (HST->useCompound()) {
C = CurDAG->getMachineNode(Hexagon::S4_andi_asl_ri, dl, MVT::i32,
M0, N->getOperand(2), M1);
} else {
SDNode *T = CurDAG->getMachineNode(Hexagon::S2_asl_i_r, dl, MVT::i32,
N->getOperand(2), M1);
C = CurDAG->getMachineNode(Hexagon::A2_andir, dl, MVT::i32,
SDValue(T, 0), M0);
}
SDNode *S = CurDAG->getMachineNode(Hexagon::S2_lsr_r_p, dl, MVT::i64,
SDValue(R, 0), SDValue(C, 0));
SDValue E = CurDAG->getTargetExtractSubreg(Hexagon::isub_lo, dl, ResTy,
SDValue(S, 0));
ReplaceNode(N, E.getNode());
} else {
assert(VecLen == 64);
SDNode *Pu = CurDAG->getMachineNode(Hexagon::C2_tfrrp, dl, MVT::v8i1,
N->getOperand(2));
SDNode *VA = CurDAG->getMachineNode(Hexagon::S2_valignrb, dl, ResTy,
N->getOperand(0), N->getOperand(1),
SDValue(Pu,0));
ReplaceNode(N, VA);
}
}
void HexagonDAGToDAGISel::SelectVAlignAddr(SDNode *N) {
const SDLoc &dl(N);
SDValue A = N->getOperand(1);
int Mask = -cast<ConstantSDNode>(A.getNode())->getSExtValue();
assert(isPowerOf2_32(-Mask));
SDValue M = CurDAG->getTargetConstant(Mask, dl, MVT::i32);
SDNode *AA = CurDAG->getMachineNode(Hexagon::A2_andir, dl, MVT::i32,
N->getOperand(0), M);
ReplaceNode(N, AA);
}
// Handle these nodes here to avoid having to write patterns for all
// combinations of input/output types. In all cases, the resulting
// instruction is the same.
void HexagonDAGToDAGISel::SelectTypecast(SDNode *N) {
SDValue Op = N->getOperand(0);
MVT OpTy = Op.getValueType().getSimpleVT();
SDNode *T = CurDAG->MorphNodeTo(N, N->getOpcode(),
CurDAG->getVTList(OpTy), {Op});
ReplaceNode(T, Op.getNode());
}
void HexagonDAGToDAGISel::SelectP2D(SDNode *N) {
MVT ResTy = N->getValueType(0).getSimpleVT();
SDNode *T = CurDAG->getMachineNode(Hexagon::C2_mask, SDLoc(N), ResTy,
N->getOperand(0));
ReplaceNode(N, T);
}
void HexagonDAGToDAGISel::SelectD2P(SDNode *N) {
const SDLoc &dl(N);
MVT ResTy = N->getValueType(0).getSimpleVT();
SDValue Zero = CurDAG->getTargetConstant(0, dl, MVT::i32);
SDNode *T = CurDAG->getMachineNode(Hexagon::A4_vcmpbgtui, dl, ResTy,
N->getOperand(0), Zero);
ReplaceNode(N, T);
}
void HexagonDAGToDAGISel::SelectV2Q(SDNode *N) {
const SDLoc &dl(N);
MVT ResTy = N->getValueType(0).getSimpleVT();
// The argument to V2Q should be a single vector.
MVT OpTy = N->getOperand(0).getValueType().getSimpleVT(); (void)OpTy;
assert(HST->getVectorLength() * 8 == OpTy.getSizeInBits());
SDValue C = CurDAG->getTargetConstant(-1, dl, MVT::i32);
SDNode *R = CurDAG->getMachineNode(Hexagon::A2_tfrsi, dl, MVT::i32, C);
SDNode *T = CurDAG->getMachineNode(Hexagon::V6_vandvrt, dl, ResTy,
N->getOperand(0), SDValue(R,0));
ReplaceNode(N, T);
}
void HexagonDAGToDAGISel::SelectQ2V(SDNode *N) {
const SDLoc &dl(N);
MVT ResTy = N->getValueType(0).getSimpleVT();
// The result of V2Q should be a single vector.
assert(HST->getVectorLength() * 8 == ResTy.getSizeInBits());
SDValue C = CurDAG->getTargetConstant(-1, dl, MVT::i32);
SDNode *R = CurDAG->getMachineNode(Hexagon::A2_tfrsi, dl, MVT::i32, C);
SDNode *T = CurDAG->getMachineNode(Hexagon::V6_vandqrt, dl, ResTy,
N->getOperand(0), SDValue(R,0));
ReplaceNode(N, T);
}
void HexagonDAGToDAGISel::Select(SDNode *N) {
if (N->isMachineOpcode())
return N->setNodeId(-1); // Already selected.
switch (N->getOpcode()) {
case ISD::Constant: return SelectConstant(N);
case ISD::ConstantFP: return SelectConstantFP(N);
case ISD::FrameIndex: return SelectFrameIndex(N);
case ISD::SHL: return SelectSHL(N);
case ISD::LOAD: return SelectLoad(N);
case ISD::STORE: return SelectStore(N);
case ISD::INTRINSIC_W_CHAIN: return SelectIntrinsicWChain(N);
case ISD::INTRINSIC_WO_CHAIN: return SelectIntrinsicWOChain(N);
case HexagonISD::ADDC:
case HexagonISD::SUBC: return SelectAddSubCarry(N);
case HexagonISD::VALIGN: return SelectVAlign(N);
case HexagonISD::VALIGNADDR: return SelectVAlignAddr(N);
case HexagonISD::TYPECAST: return SelectTypecast(N);
case HexagonISD::P2D: return SelectP2D(N);
case HexagonISD::D2P: return SelectD2P(N);
case HexagonISD::Q2V: return SelectQ2V(N);
case HexagonISD::V2Q: return SelectV2Q(N);
}
if (HST->useHVXOps()) {
switch (N->getOpcode()) {
case ISD::VECTOR_SHUFFLE: return SelectHvxShuffle(N);
case HexagonISD::VROR: return SelectHvxRor(N);
}
}
SelectCode(N);
}
bool HexagonDAGToDAGISel::
SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID,
std::vector<SDValue> &OutOps) {
SDValue Inp = Op, Res;
switch (ConstraintID) {
default:
return true;
case InlineAsm::Constraint_o: // Offsetable.
case InlineAsm::Constraint_v: // Not offsetable.
case InlineAsm::Constraint_m: // Memory.
if (SelectAddrFI(Inp, Res))
OutOps.push_back(Res);
else
OutOps.push_back(Inp);
break;
}
OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
return false;
}
static bool isMemOPCandidate(SDNode *I, SDNode *U) {
// I is an operand of U. Check if U is an arithmetic (binary) operation
// usable in a memop, where the other operand is a loaded value, and the
// result of U is stored in the same location.
if (!U->hasOneUse())
return false;
unsigned Opc = U->getOpcode();
switch (Opc) {
case ISD::ADD:
case ISD::SUB:
case ISD::AND:
case ISD::OR:
break;
default:
return false;
}
SDValue S0 = U->getOperand(0);
SDValue S1 = U->getOperand(1);
SDValue SY = (S0.getNode() == I) ? S1 : S0;
SDNode *UUse = *U->use_begin();
if (UUse->getNumValues() != 1)
return false;
// Check if one of the inputs to U is a load instruction and the output
// is used by a store instruction. If so and they also have the same
// base pointer, then don't preoprocess this node sequence as it
// can be matched to a memop.
SDNode *SYNode = SY.getNode();
if (UUse->getOpcode() == ISD::STORE && SYNode->getOpcode() == ISD::LOAD) {
SDValue LDBasePtr = cast<MemSDNode>(SYNode)->getBasePtr();
SDValue STBasePtr = cast<MemSDNode>(UUse)->getBasePtr();
if (LDBasePtr == STBasePtr)
return true;
}
return false;
}
// Transform: (or (select c x 0) z) -> (select c (or x z) z)
// (or (select c 0 y) z) -> (select c z (or y z))
void HexagonDAGToDAGISel::ppSimplifyOrSelect0(std::vector<SDNode*> &&Nodes) {
SelectionDAG &DAG = *CurDAG;
for (auto I : Nodes) {
if (I->getOpcode() != ISD::OR)
continue;
auto IsZero = [] (const SDValue &V) -> bool {
if (ConstantSDNode *SC = dyn_cast<ConstantSDNode>(V.getNode()))
return SC->isNullValue();
return false;
};
auto IsSelect0 = [IsZero] (const SDValue &Op) -> bool {
if (Op.getOpcode() != ISD::SELECT)
return false;
return IsZero(Op.getOperand(1)) || IsZero(Op.getOperand(2));
};
SDValue N0 = I->getOperand(0), N1 = I->getOperand(1);
EVT VT = I->getValueType(0);
bool SelN0 = IsSelect0(N0);
SDValue SOp = SelN0 ? N0 : N1;
SDValue VOp = SelN0 ? N1 : N0;
if (SOp.getOpcode() == ISD::SELECT && SOp.getNode()->hasOneUse()) {
SDValue SC = SOp.getOperand(0);
SDValue SX = SOp.getOperand(1);
SDValue SY = SOp.getOperand(2);
SDLoc DLS = SOp;
if (IsZero(SY)) {
SDValue NewOr = DAG.getNode(ISD::OR, DLS, VT, SX, VOp);
SDValue NewSel = DAG.getNode(ISD::SELECT, DLS, VT, SC, NewOr, VOp);
DAG.ReplaceAllUsesWith(I, NewSel.getNode());
} else if (IsZero(SX)) {
SDValue NewOr = DAG.getNode(ISD::OR, DLS, VT, SY, VOp);
SDValue NewSel = DAG.getNode(ISD::SELECT, DLS, VT, SC, VOp, NewOr);
DAG.ReplaceAllUsesWith(I, NewSel.getNode());
}
}
}
}
// Transform: (store ch val (add x (add (shl y c) e)))
// to: (store ch val (add x (shl (add y d) c))),
// where e = (shl d c) for some integer d.
// The purpose of this is to enable generation of loads/stores with
// shifted addressing mode, i.e. mem(x+y<<#c). For that, the shift
// value c must be 0, 1 or 2.
void HexagonDAGToDAGISel::ppAddrReorderAddShl(std::vector<SDNode*> &&Nodes) {
SelectionDAG &DAG = *CurDAG;
for (auto I : Nodes) {
if (I->getOpcode() != ISD::STORE)
continue;
// I matched: (store ch val Off)
SDValue Off = I->getOperand(2);
// Off needs to match: (add x (add (shl y c) (shl d c))))
if (Off.getOpcode() != ISD::ADD)
continue;
// Off matched: (add x T0)
SDValue T0 = Off.getOperand(1);
// T0 needs to match: (add T1 T2):
if (T0.getOpcode() != ISD::ADD)
continue;
// T0 matched: (add T1 T2)
SDValue T1 = T0.getOperand(0);
SDValue T2 = T0.getOperand(1);
// T1 needs to match: (shl y c)
if (T1.getOpcode() != ISD::SHL)
continue;
SDValue C = T1.getOperand(1);
ConstantSDNode *CN = dyn_cast<ConstantSDNode>(C.getNode());
if (CN == nullptr)
continue;
unsigned CV = CN->getZExtValue();
if (CV > 2)
continue;
// T2 needs to match e, where e = (shl d c) for some d.
ConstantSDNode *EN = dyn_cast<ConstantSDNode>(T2.getNode());
if (EN == nullptr)
continue;
unsigned EV = EN->getZExtValue();
if (EV % (1 << CV) != 0)
continue;
unsigned DV = EV / (1 << CV);
// Replace T0 with: (shl (add y d) c)
SDLoc DL = SDLoc(I);
EVT VT = T0.getValueType();
SDValue D = DAG.getConstant(DV, DL, VT);
// NewAdd = (add y d)
SDValue NewAdd = DAG.getNode(ISD::ADD, DL, VT, T1.getOperand(0), D);
// NewShl = (shl NewAdd c)
SDValue NewShl = DAG.getNode(ISD::SHL, DL, VT, NewAdd, C);
ReplaceNode(T0.getNode(), NewShl.getNode());
}
}
// Transform: (load ch (add x (and (srl y c) Mask)))
// to: (load ch (add x (shl (srl y d) d-c)))
// where
// Mask = 00..0 111..1 0.0
// | | +-- d-c 0s, and d-c is 0, 1 or 2.
// | +-------- 1s
// +-------------- at most c 0s
// Motivating example:
// DAG combiner optimizes (add x (shl (srl y 5) 2))
// to (add x (and (srl y 3) 1FFFFFFC))
// which results in a constant-extended and(##...,lsr). This transformation
// undoes this simplification for cases where the shl can be folded into
// an addressing mode.
void HexagonDAGToDAGISel::ppAddrRewriteAndSrl(std::vector<SDNode*> &&Nodes) {
SelectionDAG &DAG = *CurDAG;
for (SDNode *N : Nodes) {
unsigned Opc = N->getOpcode();
if (Opc != ISD::LOAD && Opc != ISD::STORE)
continue;
SDValue Addr = Opc == ISD::LOAD ? N->getOperand(1) : N->getOperand(2);
// Addr must match: (add x T0)
if (Addr.getOpcode() != ISD::ADD)
continue;
SDValue T0 = Addr.getOperand(1);
// T0 must match: (and T1 Mask)
if (T0.getOpcode() != ISD::AND)
continue;
// We have an AND.
//
// Check the first operand. It must be: (srl y c).
SDValue S = T0.getOperand(0);
if (S.getOpcode() != ISD::SRL)
continue;
ConstantSDNode *SN = dyn_cast<ConstantSDNode>(S.getOperand(1).getNode());
if (SN == nullptr)
continue;
if (SN->getAPIntValue().getBitWidth() != 32)
continue;
uint32_t CV = SN->getZExtValue();
// Check the second operand: the supposed mask.
ConstantSDNode *MN = dyn_cast<ConstantSDNode>(T0.getOperand(1).getNode());
if (MN == nullptr)
continue;
if (MN->getAPIntValue().getBitWidth() != 32)
continue;
uint32_t Mask = MN->getZExtValue();
// Examine the mask.
uint32_t TZ = countTrailingZeros(Mask);
uint32_t M1 = countTrailingOnes(Mask >> TZ);
uint32_t LZ = countLeadingZeros(Mask);
// Trailing zeros + middle ones + leading zeros must equal the width.
if (TZ + M1 + LZ != 32)
continue;
// The number of trailing zeros will be encoded in the addressing mode.
if (TZ > 2)
continue;
// The number of leading zeros must be at most c.
if (LZ > CV)
continue;
// All looks good.
SDValue Y = S.getOperand(0);
EVT VT = Addr.getValueType();
SDLoc dl(S);
// TZ = D-C, so D = TZ+C.
SDValue D = DAG.getConstant(TZ+CV, dl, VT);
SDValue DC = DAG.getConstant(TZ, dl, VT);
SDValue NewSrl = DAG.getNode(ISD::SRL, dl, VT, Y, D);
SDValue NewShl = DAG.getNode(ISD::SHL, dl, VT, NewSrl, DC);
ReplaceNode(T0.getNode(), NewShl.getNode());
}
}
// Transform: (op ... (zext i1 c) ...) -> (select c (op ... 0 ...)
// (op ... 1 ...))
void HexagonDAGToDAGISel::ppHoistZextI1(std::vector<SDNode*> &&Nodes) {
SelectionDAG &DAG = *CurDAG;
for (SDNode *N : Nodes) {
unsigned Opc = N->getOpcode();
if (Opc != ISD::ZERO_EXTEND)
continue;
SDValue OpI1 = N->getOperand(0);
EVT OpVT = OpI1.getValueType();
if (!OpVT.isSimple() || OpVT.getSimpleVT() != MVT::i1)
continue;
for (auto I = N->use_begin(), E = N->use_end(); I != E; ++I) {
SDNode *U = *I;
if (U->getNumValues() != 1)
continue;
EVT UVT = U->getValueType(0);
if (!UVT.isSimple() || !UVT.isInteger() || UVT.getSimpleVT() == MVT::i1)
continue;
if (isMemOPCandidate(N, U))
continue;
// Potentially simplifiable operation.
unsigned I1N = I.getOperandNo();
SmallVector<SDValue,2> Ops(U->getNumOperands());
for (unsigned i = 0, n = U->getNumOperands(); i != n; ++i)
Ops[i] = U->getOperand(i);
EVT BVT = Ops[I1N].getValueType();
const SDLoc &dl(U);
SDValue C0 = DAG.getConstant(0, dl, BVT);
SDValue C1 = DAG.getConstant(1, dl, BVT);
SDValue If0, If1;
if (isa<MachineSDNode>(U)) {
unsigned UseOpc = U->getMachineOpcode();
Ops[I1N] = C0;
If0 = SDValue(DAG.getMachineNode(UseOpc, dl, UVT, Ops), 0);
Ops[I1N] = C1;
If1 = SDValue(DAG.getMachineNode(UseOpc, dl, UVT, Ops), 0);
} else {
unsigned UseOpc = U->getOpcode();
Ops[I1N] = C0;
If0 = DAG.getNode(UseOpc, dl, UVT, Ops);
Ops[I1N] = C1;
If1 = DAG.getNode(UseOpc, dl, UVT, Ops);
}
// We're generating a SELECT way after legalization, so keep the types
// simple.
unsigned UW = UVT.getSizeInBits();
EVT SVT = (UW == 32 || UW == 64) ? MVT::getIntegerVT(UW) : UVT;
SDValue Sel = DAG.getNode(ISD::SELECT, dl, SVT, OpI1,
DAG.getBitcast(SVT, If1),
DAG.getBitcast(SVT, If0));
SDValue Ret = DAG.getBitcast(UVT, Sel);
DAG.ReplaceAllUsesWith(U, Ret.getNode());
}
}
}
void HexagonDAGToDAGISel::PreprocessISelDAG() {
// Repack all nodes before calling each preprocessing function,
// because each of them can modify the set of nodes.
auto getNodes = [this] () -> std::vector<SDNode*> {
std::vector<SDNode*> T;
T.reserve(CurDAG->allnodes_size());
for (SDNode &N : CurDAG->allnodes())
T.push_back(&N);
return T;
};
// Transform: (or (select c x 0) z) -> (select c (or x z) z)
// (or (select c 0 y) z) -> (select c z (or y z))
ppSimplifyOrSelect0(getNodes());
// Transform: (store ch val (add x (add (shl y c) e)))
// to: (store ch val (add x (shl (add y d) c))),
// where e = (shl d c) for some integer d.
// The purpose of this is to enable generation of loads/stores with
// shifted addressing mode, i.e. mem(x+y<<#c). For that, the shift
// value c must be 0, 1 or 2.
ppAddrReorderAddShl(getNodes());
// Transform: (load ch (add x (and (srl y c) Mask)))
// to: (load ch (add x (shl (srl y d) d-c)))
// where
// Mask = 00..0 111..1 0.0
// | | +-- d-c 0s, and d-c is 0, 1 or 2.
// | +-------- 1s
// +-------------- at most c 0s
// Motivating example:
// DAG combiner optimizes (add x (shl (srl y 5) 2))
// to (add x (and (srl y 3) 1FFFFFFC))
// which results in a constant-extended and(##...,lsr). This transformation
// undoes this simplification for cases where the shl can be folded into
// an addressing mode.
ppAddrRewriteAndSrl(getNodes());
// Transform: (op ... (zext i1 c) ...) -> (select c (op ... 0 ...)
// (op ... 1 ...))
ppHoistZextI1(getNodes());
DEBUG_WITH_TYPE("isel", {
dbgs() << "Preprocessed (Hexagon) selection DAG:";
CurDAG->dump();
});
if (EnableAddressRebalancing) {
rebalanceAddressTrees();
DEBUG_WITH_TYPE("isel", {
dbgs() << "Address tree balanced selection DAG:";
CurDAG->dump();
});
}
}
void HexagonDAGToDAGISel::emitFunctionEntryCode() {
auto &HST = MF->getSubtarget<HexagonSubtarget>();
auto &HFI = *HST.getFrameLowering();
if (!HFI.needsAligna(*MF))
return;
MachineFrameInfo &MFI = MF->getFrameInfo();
MachineBasicBlock *EntryBB = &MF->front();
unsigned AR = FuncInfo->CreateReg(MVT::i32);
Align EntryMaxA = MFI.getMaxAlign();
BuildMI(EntryBB, DebugLoc(), HII->get(Hexagon::PS_aligna), AR)
.addImm(EntryMaxA.value());
MF->getInfo<HexagonMachineFunctionInfo>()->setStackAlignBaseVReg(AR);
}
void HexagonDAGToDAGISel::updateAligna() {
auto &HFI = *MF->getSubtarget<HexagonSubtarget>().getFrameLowering();
if (!HFI.needsAligna(*MF))
return;
auto *AlignaI = const_cast<MachineInstr*>(HFI.getAlignaInstr(*MF));
assert(AlignaI != nullptr);
unsigned MaxA = MF->getFrameInfo().getMaxAlign().value();
if (AlignaI->getOperand(1).getImm() < MaxA)
AlignaI->getOperand(1).setImm(MaxA);
}
// Match a frame index that can be used in an addressing mode.
bool HexagonDAGToDAGISel::SelectAddrFI(SDValue &N, SDValue &R) {
if (N.getOpcode() != ISD::FrameIndex)
return false;
auto &HFI = *HST->getFrameLowering();
MachineFrameInfo &MFI = MF->getFrameInfo();
int FX = cast<FrameIndexSDNode>(N)->getIndex();
if (!MFI.isFixedObjectIndex(FX) && HFI.needsAligna(*MF))
return false;
R = CurDAG->getTargetFrameIndex(FX, MVT::i32);
return true;
}
inline bool HexagonDAGToDAGISel::SelectAddrGA(SDValue &N, SDValue &R) {
return SelectGlobalAddress(N, R, false, Align(1));
}
inline bool HexagonDAGToDAGISel::SelectAddrGP(SDValue &N, SDValue &R) {
return SelectGlobalAddress(N, R, true, Align(1));
}
inline bool HexagonDAGToDAGISel::SelectAnyImm(SDValue &N, SDValue &R) {
return SelectAnyImmediate(N, R, Align(1));
}
inline bool HexagonDAGToDAGISel::SelectAnyImm0(SDValue &N, SDValue &R) {
return SelectAnyImmediate(N, R, Align(1));
}
inline bool HexagonDAGToDAGISel::SelectAnyImm1(SDValue &N, SDValue &R) {
return SelectAnyImmediate(N, R, Align(2));
}
inline bool HexagonDAGToDAGISel::SelectAnyImm2(SDValue &N, SDValue &R) {
return SelectAnyImmediate(N, R, Align(4));
}
inline bool HexagonDAGToDAGISel::SelectAnyImm3(SDValue &N, SDValue &R) {
return SelectAnyImmediate(N, R, Align(8));
}
inline bool HexagonDAGToDAGISel::SelectAnyInt(SDValue &N, SDValue &R) {
EVT T = N.getValueType();
if (!T.isInteger() || T.getSizeInBits() != 32 || !isa<ConstantSDNode>(N))
return false;
R = N;
return true;
}
bool HexagonDAGToDAGISel::SelectAnyImmediate(SDValue &N, SDValue &R,
Align Alignment) {
switch (N.getOpcode()) {
case ISD::Constant: {
if (N.getValueType() != MVT::i32)
return false;
int32_t V = cast<const ConstantSDNode>(N)->getZExtValue();
if (!isAligned(Alignment, V))
return false;
R = CurDAG->getTargetConstant(V, SDLoc(N), N.getValueType());
return true;
}
case HexagonISD::JT:
case HexagonISD::CP:
// These are assumed to always be aligned at least 8-byte boundary.
if (Alignment > Align(8))
return false;
R = N.getOperand(0);
return true;
case ISD::ExternalSymbol:
// Symbols may be aligned at any boundary.
if (Alignment > Align(1))
return false;
R = N;
return true;
case ISD::BlockAddress:
// Block address is always aligned at least 4-byte boundary.
if (Alignment > Align(4) ||
!isAligned(Alignment, cast<BlockAddressSDNode>(N)->getOffset()))
return false;
R = N;
return true;
}
if (SelectGlobalAddress(N, R, false, Alignment) ||
SelectGlobalAddress(N, R, true, Alignment))
return true;
return false;
}
bool HexagonDAGToDAGISel::SelectGlobalAddress(SDValue &N, SDValue &R,
bool UseGP, Align Alignment) {
switch (N.getOpcode()) {
case ISD::ADD: {
SDValue N0 = N.getOperand(0);
SDValue N1 = N.getOperand(1);
unsigned GAOpc = N0.getOpcode();
if (UseGP && GAOpc != HexagonISD::CONST32_GP)
return false;
if (!UseGP && GAOpc != HexagonISD::CONST32)
return false;
if (ConstantSDNode *Const = dyn_cast<ConstantSDNode>(N1)) {
if (!isAligned(Alignment, Const->getZExtValue()))
return false;
SDValue Addr = N0.getOperand(0);
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Addr)) {
if (GA->getOpcode() == ISD::TargetGlobalAddress) {
uint64_t NewOff = GA->getOffset() + (uint64_t)Const->getSExtValue();
R = CurDAG->getTargetGlobalAddress(GA->getGlobal(), SDLoc(Const),
N.getValueType(), NewOff);
return true;
}
}
}
break;
}
case HexagonISD::CP:
case HexagonISD::JT:
case HexagonISD::CONST32:
// The operand(0) of CONST32 is TargetGlobalAddress, which is what we
// want in the instruction.
if (!UseGP)
R = N.getOperand(0);
return !UseGP;
case HexagonISD::CONST32_GP:
if (UseGP)
R = N.getOperand(0);
return UseGP;
default:
return false;
}
return false;
}
bool HexagonDAGToDAGISel::DetectUseSxtw(SDValue &N, SDValue &R) {
// This (complex pattern) function is meant to detect a sign-extension
// i32->i64 on a per-operand basis. This would allow writing single
// patterns that would cover a number of combinations of different ways
// a sign-extensions could be written. For example:
// (mul (DetectUseSxtw x) (DetectUseSxtw y)) -> (M2_dpmpyss_s0 x y)
// could match either one of these:
// (mul (sext x) (sext_inreg y))
// (mul (sext-load *p) (sext_inreg y))
// (mul (sext_inreg x) (sext y))
// etc.
//
// The returned value will have type i64 and its low word will
// contain the value being extended. The high bits are not specified.
// The returned type is i64 because the original type of N was i64,
// but the users of this function should only use the low-word of the
// result, e.g.
// (mul sxtw:x, sxtw:y) -> (M2_dpmpyss_s0 (LoReg sxtw:x), (LoReg sxtw:y))
if (N.getValueType() != MVT::i64)
return false;
unsigned Opc = N.getOpcode();
switch (Opc) {
case ISD::SIGN_EXTEND:
case ISD::SIGN_EXTEND_INREG: {
// sext_inreg has the source type as a separate operand.
EVT T = Opc == ISD::SIGN_EXTEND
? N.getOperand(0).getValueType()
: cast<VTSDNode>(N.getOperand(1))->getVT();
unsigned SW = T.getSizeInBits();
if (SW == 32)
R = N.getOperand(0);
else if (SW < 32)
R = N;
else
return false;
break;
}
case ISD::LOAD: {
LoadSDNode *L = cast<LoadSDNode>(N);
if (L->getExtensionType() != ISD::SEXTLOAD)
return false;
// All extending loads extend to i32, so even if the value in
// memory is shorter than 32 bits, it will be i32 after the load.
if (L->getMemoryVT().getSizeInBits() > 32)
return false;
R = N;
break;
}
case ISD::SRA: {
auto *S = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!S || S->getZExtValue() != 32)
return false;
R = N;
break;
}
default:
return false;
}
EVT RT = R.getValueType();
if (RT == MVT::i64)
return true;
assert(RT == MVT::i32);
// This is only to produce a value of type i64. Do not rely on the
// high bits produced by this.
const SDLoc &dl(N);
SDValue Ops[] = {
CurDAG->getTargetConstant(Hexagon::DoubleRegsRegClassID, dl, MVT::i32),
R, CurDAG->getTargetConstant(Hexagon::isub_hi, dl, MVT::i32),
R, CurDAG->getTargetConstant(Hexagon::isub_lo, dl, MVT::i32)
};
SDNode *T = CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl,
MVT::i64, Ops);
R = SDValue(T, 0);
return true;
}
bool HexagonDAGToDAGISel::keepsLowBits(const SDValue &Val, unsigned NumBits,
SDValue &Src) {
unsigned Opc = Val.getOpcode();
switch (Opc) {
case ISD::SIGN_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::ANY_EXTEND: {
const SDValue &Op0 = Val.getOperand(0);
EVT T = Op0.getValueType();
if (T.isInteger() && T.getSizeInBits() == NumBits) {
Src = Op0;
return true;
}
break;
}
case ISD::SIGN_EXTEND_INREG:
case ISD::AssertSext:
case ISD::AssertZext:
if (Val.getOperand(0).getValueType().isInteger()) {
VTSDNode *T = cast<VTSDNode>(Val.getOperand(1));
if (T->getVT().getSizeInBits() == NumBits) {
Src = Val.getOperand(0);
return true;
}
}
break;
case ISD::AND: {
// Check if this is an AND with NumBits of lower bits set to 1.
uint64_t Mask = (1 << NumBits) - 1;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Val.getOperand(0))) {
if (C->getZExtValue() == Mask) {
Src = Val.getOperand(1);
return true;
}
}
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Val.getOperand(1))) {
if (C->getZExtValue() == Mask) {
Src = Val.getOperand(0);
return true;
}
}
break;
}
case ISD::OR:
case ISD::XOR: {
// OR/XOR with the lower NumBits bits set to 0.
uint64_t Mask = (1 << NumBits) - 1;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Val.getOperand(0))) {
if ((C->getZExtValue() & Mask) == 0) {
Src = Val.getOperand(1);
return true;
}
}
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Val.getOperand(1))) {
if ((C->getZExtValue() & Mask) == 0) {
Src = Val.getOperand(0);
return true;
}
}
break;
}
default:
break;
}
return false;
}
bool HexagonDAGToDAGISel::isAlignedMemNode(const MemSDNode *N) const {
return N->getAlignment() >= N->getMemoryVT().getStoreSize();
}
bool HexagonDAGToDAGISel::isSmallStackStore(const StoreSDNode *N) const {
unsigned StackSize = MF->getFrameInfo().estimateStackSize(*MF);
switch (N->getMemoryVT().getStoreSize()) {
case 1:
return StackSize <= 56; // 1*2^6 - 8
case 2:
return StackSize <= 120; // 2*2^6 - 8
case 4:
return StackSize <= 248; // 4*2^6 - 8
default:
return false;
}
}
// Return true when the given node fits in a positive half word.
bool HexagonDAGToDAGISel::isPositiveHalfWord(const SDNode *N) const {
if (const ConstantSDNode *CN = dyn_cast<const ConstantSDNode>(N)) {
int64_t V = CN->getSExtValue();
return V > 0 && isInt<16>(V);
}
if (N->getOpcode() == ISD::SIGN_EXTEND_INREG) {
const VTSDNode *VN = dyn_cast<const VTSDNode>(N->getOperand(1));
return VN->getVT().getSizeInBits() <= 16;
}
return false;
}
bool HexagonDAGToDAGISel::hasOneUse(const SDNode *N) const {
return !CheckSingleUse || N->hasOneUse();
}
////////////////////////////////////////////////////////////////////////////////
// Rebalancing of address calculation trees
static bool isOpcodeHandled(const SDNode *N) {
switch (N->getOpcode()) {
case ISD::ADD:
case ISD::MUL:
return true;
case ISD::SHL:
// We only handle constant shifts because these can be easily flattened
// into multiplications by 2^Op1.
return isa<ConstantSDNode>(N->getOperand(1).getNode());
default:
return false;
}
}
/// Return the weight of an SDNode
int HexagonDAGToDAGISel::getWeight(SDNode *N) {
if (!isOpcodeHandled(N))
return 1;
assert(RootWeights.count(N) && "Cannot get weight of unseen root!");
assert(RootWeights[N] != -1 && "Cannot get weight of unvisited root!");
assert(RootWeights[N] != -2 && "Cannot get weight of RAWU'd root!");
return RootWeights[N];
}
int HexagonDAGToDAGISel::getHeight(SDNode *N) {
if (!isOpcodeHandled(N))
return 0;
assert(RootWeights.count(N) && RootWeights[N] >= 0 &&
"Cannot query height of unvisited/RAUW'd node!");
return RootHeights[N];
}
namespace {
struct WeightedLeaf {
SDValue Value;
int Weight;
int InsertionOrder;
WeightedLeaf() : Value(SDValue()) { }
WeightedLeaf(SDValue Value, int Weight, int InsertionOrder) :
Value(Value), Weight(Weight), InsertionOrder(InsertionOrder) {
assert(Weight >= 0 && "Weight must be >= 0");
}
static bool Compare(const WeightedLeaf &A, const WeightedLeaf &B) {
assert(A.Value.getNode() && B.Value.getNode());
return A.Weight == B.Weight ?
(A.InsertionOrder > B.InsertionOrder) :
(A.Weight > B.Weight);
}
};
/// A specialized priority queue for WeigthedLeaves. It automatically folds
/// constants and allows removal of non-top elements while maintaining the
/// priority order.
class LeafPrioQueue {
SmallVector<WeightedLeaf, 8> Q;
bool HaveConst;
WeightedLeaf ConstElt;
unsigned Opcode;
public:
bool empty() {
return (!HaveConst && Q.empty());
}
size_t size() {
return Q.size() + HaveConst;
}
bool hasConst() {
return HaveConst;
}
const WeightedLeaf &top() {
if (HaveConst)
return ConstElt;
return Q.front();
}
WeightedLeaf pop() {
if (HaveConst) {
HaveConst = false;
return ConstElt;
}
std::pop_heap(Q.begin(), Q.end(), WeightedLeaf::Compare);
return Q.pop_back_val();
}
void push(WeightedLeaf L, bool SeparateConst=true) {
if (!HaveConst && SeparateConst && isa<ConstantSDNode>(L.Value)) {
if (Opcode == ISD::MUL &&
cast<ConstantSDNode>(L.Value)->getSExtValue() == 1)
return;
if (Opcode == ISD::ADD &&
cast<ConstantSDNode>(L.Value)->getSExtValue() == 0)
return;
HaveConst = true;
ConstElt = L;
} else {
Q.push_back(L);
std::push_heap(Q.begin(), Q.end(), WeightedLeaf::Compare);
}
}
/// Push L to the bottom of the queue regardless of its weight. If L is
/// constant, it will not be folded with other constants in the queue.
void pushToBottom(WeightedLeaf L) {
L.Weight = 1000;
push(L, false);
}
/// Search for a SHL(x, [<=MaxAmount]) subtree in the queue, return the one of
/// lowest weight and remove it from the queue.
WeightedLeaf findSHL(uint64_t MaxAmount);
WeightedLeaf findMULbyConst();
LeafPrioQueue(unsigned Opcode) :
HaveConst(false), Opcode(Opcode) { }
};
} // end anonymous namespace
WeightedLeaf LeafPrioQueue::findSHL(uint64_t MaxAmount) {
int ResultPos;
WeightedLeaf Result;
for (int Pos = 0, End = Q.size(); Pos != End; ++Pos) {
const WeightedLeaf &L = Q[Pos];
const SDValue &Val = L.Value;
if (Val.getOpcode() != ISD::SHL ||
!isa<ConstantSDNode>(Val.getOperand(1)) ||
Val.getConstantOperandVal(1) > MaxAmount)
continue;
if (!Result.Value.getNode() || Result.Weight > L.Weight ||
(Result.Weight == L.Weight && Result.InsertionOrder > L.InsertionOrder))
{
Result = L;
ResultPos = Pos;
}
}
if (Result.Value.getNode()) {
Q.erase(&Q[ResultPos]);
std::make_heap(Q.begin(), Q.end(), WeightedLeaf::Compare);
}
return Result;
}
WeightedLeaf LeafPrioQueue::findMULbyConst() {
int ResultPos;
WeightedLeaf Result;
for (int Pos = 0, End = Q.size(); Pos != End; ++Pos) {
const WeightedLeaf &L = Q[Pos];
const SDValue &Val = L.Value;
if (Val.getOpcode() != ISD::MUL ||
!isa<ConstantSDNode>(Val.getOperand(1)) ||
Val.getConstantOperandVal(1) > 127)
continue;
if (!Result.Value.getNode() || Result.Weight > L.Weight ||
(Result.Weight == L.Weight && Result.InsertionOrder > L.InsertionOrder))
{
Result = L;
ResultPos = Pos;
}
}
if (Result.Value.getNode()) {
Q.erase(&Q[ResultPos]);
std::make_heap(Q.begin(), Q.end(), WeightedLeaf::Compare);
}
return Result;
}
SDValue HexagonDAGToDAGISel::getMultiplierForSHL(SDNode *N) {
uint64_t MulFactor = 1ull << N->getConstantOperandVal(1);
return CurDAG->getConstant(MulFactor, SDLoc(N),
N->getOperand(1).getValueType());
}
/// @returns the value x for which 2^x is a factor of Val
static unsigned getPowerOf2Factor(SDValue Val) {
if (Val.getOpcode() == ISD::MUL) {
unsigned MaxFactor = 0;
for (int i = 0; i < 2; ++i) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Val.getOperand(i));
if (!C)
continue;
const APInt &CInt = C->getAPIntValue();
if (CInt.getBoolValue())
MaxFactor = CInt.countTrailingZeros();
}
return MaxFactor;
}
if (Val.getOpcode() == ISD::SHL) {
if (!isa<ConstantSDNode>(Val.getOperand(1).getNode()))
return 0;
return (unsigned) Val.getConstantOperandVal(1);
}
return 0;
}
/// @returns true if V>>Amount will eliminate V's operation on its child
static bool willShiftRightEliminate(SDValue V, unsigned Amount) {
if (V.getOpcode() == ISD::MUL) {
SDValue Ops[] = { V.getOperand(0), V.getOperand(1) };
for (int i = 0; i < 2; ++i)
if (isa<ConstantSDNode>(Ops[i].getNode()) &&
V.getConstantOperandVal(i) % (1ULL << Amount) == 0) {
uint64_t NewConst = V.getConstantOperandVal(i) >> Amount;
return (NewConst == 1);
}
} else if (V.getOpcode() == ISD::SHL) {
return (Amount == V.getConstantOperandVal(1));
}
return false;
}
SDValue HexagonDAGToDAGISel::factorOutPowerOf2(SDValue V, unsigned Power) {
SDValue Ops[] = { V.getOperand(0), V.getOperand(1) };
if (V.getOpcode() == ISD::MUL) {
for (int i=0; i < 2; ++i) {
if (isa<ConstantSDNode>(Ops[i].getNode()) &&
V.getConstantOperandVal(i) % ((uint64_t)1 << Power) == 0) {
uint64_t NewConst = V.getConstantOperandVal(i) >> Power;
if (NewConst == 1)
return Ops[!i];
Ops[i] = CurDAG->getConstant(NewConst,
SDLoc(V), V.getValueType());
break;
}
}
} else if (V.getOpcode() == ISD::SHL) {
uint64_t ShiftAmount = V.getConstantOperandVal(1);
if (ShiftAmount == Power)
return Ops[0];
Ops[1] = CurDAG->getConstant(ShiftAmount - Power,
SDLoc(V), V.getValueType());
}
return CurDAG->getNode(V.getOpcode(), SDLoc(V), V.getValueType(), Ops);
}
static bool isTargetConstant(const SDValue &V) {
return V.getOpcode() == HexagonISD::CONST32 ||
V.getOpcode() == HexagonISD::CONST32_GP;
}
unsigned HexagonDAGToDAGISel::getUsesInFunction(const Value *V) {
if (GAUsesInFunction.count(V))
return GAUsesInFunction[V];
unsigned Result = 0;
const Function &CurF = CurDAG->getMachineFunction().getFunction();
for (const User *U : V->users()) {
if (isa<Instruction>(U) &&
cast<Instruction>(U)->getParent()->getParent() == &CurF)
++Result;
}
GAUsesInFunction[V] = Result;
return Result;
}
/// Note - After calling this, N may be dead. It may have been replaced by a
/// new node, so always use the returned value in place of N.
///
/// @returns The SDValue taking the place of N (which could be N if it is
/// unchanged)
SDValue HexagonDAGToDAGISel::balanceSubTree(SDNode *N, bool TopLevel) {
assert(RootWeights.count(N) && "Cannot balance non-root node.");
assert(RootWeights[N] != -2 && "This node was RAUW'd!");
assert(!TopLevel || N->getOpcode() == ISD::ADD);
// Return early if this node was already visited
if (RootWeights[N] != -1)
return SDValue(N, 0);
assert(isOpcodeHandled(N));
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
// Return early if the operands will remain unchanged or are all roots
if ((!isOpcodeHandled(Op0.getNode()) || RootWeights.count(Op0.getNode())) &&
(!isOpcodeHandled(Op1.getNode()) || RootWeights.count(Op1.getNode()))) {
SDNode *Op0N = Op0.getNode();
int Weight;
if (isOpcodeHandled(Op0N) && RootWeights[Op0N] == -1) {
Weight = getWeight(balanceSubTree(Op0N).getNode());
// Weight = calculateWeight(Op0N);
} else
Weight = getWeight(Op0N);
SDNode *Op1N = N->getOperand(1).getNode(); // Op1 may have been RAUWd
if (isOpcodeHandled(Op1N) && RootWeights[Op1N] == -1) {
Weight += getWeight(balanceSubTree(Op1N).getNode());
// Weight += calculateWeight(Op1N);
} else
Weight += getWeight(Op1N);
RootWeights[N] = Weight;
RootHeights[N] = std::max(getHeight(N->getOperand(0).getNode()),
getHeight(N->getOperand(1).getNode())) + 1;
LLVM_DEBUG(dbgs() << "--> No need to balance root (Weight=" << Weight
<< " Height=" << RootHeights[N] << "): ");
LLVM_DEBUG(N->dump(CurDAG));
return SDValue(N, 0);
}
LLVM_DEBUG(dbgs() << "** Balancing root node: ");
LLVM_DEBUG(N->dump(CurDAG));
unsigned NOpcode = N->getOpcode();
LeafPrioQueue Leaves(NOpcode);
SmallVector<SDValue, 4> Worklist;
Worklist.push_back(SDValue(N, 0));
// SHL nodes will be converted to MUL nodes
if (NOpcode == ISD::SHL)
NOpcode = ISD::MUL;
bool CanFactorize = false;
WeightedLeaf Mul1, Mul2;
unsigned MaxPowerOf2 = 0;
WeightedLeaf GA;
// Do not try to factor out a shift if there is already a shift at the tip of
// the tree.
bool HaveTopLevelShift = false;
if (TopLevel &&
((isOpcodeHandled(Op0.getNode()) && Op0.getOpcode() == ISD::SHL &&
Op0.getConstantOperandVal(1) < 4) ||
(isOpcodeHandled(Op1.getNode()) && Op1.getOpcode() == ISD::SHL &&
Op1.getConstantOperandVal(1) < 4)))
HaveTopLevelShift = true;
// Flatten the subtree into an ordered list of leaves; at the same time
// determine whether the tree is already balanced.
int InsertionOrder = 0;
SmallDenseMap<SDValue, int> NodeHeights;
bool Imbalanced = false;
int CurrentWeight = 0;
while (!Worklist.empty()) {
SDValue Child = Worklist.pop_back_val();
if (Child.getNode() != N && RootWeights.count(Child.getNode())) {
// CASE 1: Child is a root note
int Weight = RootWeights[Child.getNode()];
if (Weight == -1) {
Child = balanceSubTree(Child.getNode());
// calculateWeight(Child.getNode());
Weight = getWeight(Child.getNode());
} else if (Weight == -2) {
// Whoops, this node was RAUWd by one of the balanceSubTree calls we
// made. Our worklist isn't up to date anymore.
// Restart the whole process.
LLVM_DEBUG(dbgs() << "--> Subtree was RAUWd. Restarting...\n");
return balanceSubTree(N, TopLevel);
}
NodeHeights[Child] = 1;
CurrentWeight += Weight;
unsigned PowerOf2;
if (TopLevel && !CanFactorize && !HaveTopLevelShift &&
(Child.getOpcode() == ISD::MUL || Child.getOpcode() == ISD::SHL) &&
Child.hasOneUse() && (PowerOf2 = getPowerOf2Factor(Child))) {
// Try to identify two factorizable MUL/SHL children greedily. Leave
// them out of the priority queue for now so we can deal with them
// after.
if (!Mul1.Value.getNode()) {
Mul1 = WeightedLeaf(Child, Weight, InsertionOrder++);
MaxPowerOf2 = PowerOf2;
} else {
Mul2 = WeightedLeaf(Child, Weight, InsertionOrder++);
MaxPowerOf2 = std::min(MaxPowerOf2, PowerOf2);
// Our addressing modes can only shift by a maximum of 3
if (MaxPowerOf2 > 3)
MaxPowerOf2 = 3;
CanFactorize = true;
}
} else
Leaves.push(WeightedLeaf(Child, Weight, InsertionOrder++));
} else if (!isOpcodeHandled(Child.getNode())) {
// CASE 2: Child is an unhandled kind of node (e.g. constant)
int Weight = getWeight(Child.getNode());
NodeHeights[Child] = getHeight(Child.getNode());
CurrentWeight += Weight;
if (isTargetConstant(Child) && !GA.Value.getNode())
GA = WeightedLeaf(Child, Weight, InsertionOrder++);
else
Leaves.push(WeightedLeaf(Child, Weight, InsertionOrder++));
} else {
// CASE 3: Child is a subtree of same opcode
// Visit children first, then flatten.
unsigned ChildOpcode = Child.getOpcode();
assert(ChildOpcode == NOpcode ||
(NOpcode == ISD::MUL && ChildOpcode == ISD::SHL));
// Convert SHL to MUL
SDValue Op1;
if (ChildOpcode == ISD::SHL)
Op1 = getMultiplierForSHL(Child.getNode());
else
Op1 = Child->getOperand(1);
if (!NodeHeights.count(Op1) || !NodeHeights.count(Child->getOperand(0))) {
assert(!NodeHeights.count(Child) && "Parent visited before children?");
// Visit children first, then re-visit this node
Worklist.push_back(Child);
Worklist.push_back(Op1);
Worklist.push_back(Child->getOperand(0));
} else {
// Back at this node after visiting the children
if (std::abs(NodeHeights[Op1] - NodeHeights[Child->getOperand(0)]) > 1)
Imbalanced = true;
NodeHeights[Child] = std::max(NodeHeights[Op1],
NodeHeights[Child->getOperand(0)]) + 1;
}
}
}
LLVM_DEBUG(dbgs() << "--> Current height=" << NodeHeights[SDValue(N, 0)]
<< " weight=" << CurrentWeight
<< " imbalanced=" << Imbalanced << "\n");
// Transform MUL(x, C * 2^Y) + SHL(z, Y) -> SHL(ADD(MUL(x, C), z), Y)
// This factors out a shift in order to match memw(a<<Y+b).
if (CanFactorize && (willShiftRightEliminate(Mul1.Value, MaxPowerOf2) ||
willShiftRightEliminate(Mul2.Value, MaxPowerOf2))) {
LLVM_DEBUG(dbgs() << "--> Found common factor for two MUL children!\n");
int Weight = Mul1.Weight + Mul2.Weight;
int Height = std::max(NodeHeights[Mul1.Value], NodeHeights[Mul2.Value]) + 1;
SDValue Mul1Factored = factorOutPowerOf2(Mul1.Value, MaxPowerOf2);
SDValue Mul2Factored = factorOutPowerOf2(Mul2.Value, MaxPowerOf2);
SDValue Sum = CurDAG->getNode(ISD::ADD, SDLoc(N), Mul1.Value.getValueType(),
Mul1Factored, Mul2Factored);
SDValue Const = CurDAG->getConstant(MaxPowerOf2, SDLoc(N),
Mul1.Value.getValueType());
SDValue New = CurDAG->getNode(ISD::SHL, SDLoc(N), Mul1.Value.getValueType(),
Sum, Const);
NodeHeights[New] = Height;
Leaves.push(WeightedLeaf(New, Weight, Mul1.InsertionOrder));
} else if (Mul1.Value.getNode()) {
// We failed to factorize two MULs, so now the Muls are left outside the
// queue... add them back.
Leaves.push(Mul1);
if (Mul2.Value.getNode())
Leaves.push(Mul2);
CanFactorize = false;
}
// Combine GA + Constant -> GA+Offset, but only if GA is not used elsewhere
// and the root node itself is not used more than twice. This reduces the
// amount of additional constant extenders introduced by this optimization.
bool CombinedGA = false;
if (NOpcode == ISD::ADD && GA.Value.getNode() && Leaves.hasConst() &&
GA.Value.hasOneUse() && N->use_size() < 3) {
GlobalAddressSDNode *GANode =
cast<GlobalAddressSDNode>(GA.Value.getOperand(0));
ConstantSDNode *Offset = cast<ConstantSDNode>(Leaves.top().Value);
if (getUsesInFunction(GANode->getGlobal()) == 1 && Offset->hasOneUse() &&
getTargetLowering()->isOffsetFoldingLegal(GANode)) {
LLVM_DEBUG(dbgs() << "--> Combining GA and offset ("
<< Offset->getSExtValue() << "): ");
LLVM_DEBUG(GANode->dump(CurDAG));
SDValue NewTGA =
CurDAG->getTargetGlobalAddress(GANode->getGlobal(), SDLoc(GA.Value),
GANode->getValueType(0),
GANode->getOffset() + (uint64_t)Offset->getSExtValue());
GA.Value = CurDAG->getNode(GA.Value.getOpcode(), SDLoc(GA.Value),
GA.Value.getValueType(), NewTGA);
GA.Weight += Leaves.top().Weight;
NodeHeights[GA.Value] = getHeight(GA.Value.getNode());
CombinedGA = true;
Leaves.pop(); // Remove the offset constant from the queue
}
}
if ((RebalanceOnlyForOptimizations && !CanFactorize && !CombinedGA) ||
(RebalanceOnlyImbalancedTrees && !Imbalanced)) {
RootWeights[N] = CurrentWeight;
RootHeights[N] = NodeHeights[SDValue(N, 0)];
return SDValue(N, 0);
}
// Combine GA + SHL(x, C<=31) so we will match Rx=add(#u8,asl(Rx,#U5))
if (NOpcode == ISD::ADD && GA.Value.getNode()) {
WeightedLeaf SHL = Leaves.findSHL(31);
if (SHL.Value.getNode()) {
int Height = std::max(NodeHeights[GA.Value], NodeHeights[SHL.Value]) + 1;
GA.Value = CurDAG->getNode(ISD::ADD, SDLoc(GA.Value),
GA.Value.getValueType(),
GA.Value, SHL.Value);
GA.Weight = SHL.Weight; // Specifically ignore the GA weight here
NodeHeights[GA.Value] = Height;
}
}
if (GA.Value.getNode())
Leaves.push(GA);
// If this is the top level and we haven't factored out a shift, we should try
// to move a constant to the bottom to match addressing modes like memw(rX+C)
if (TopLevel && !CanFactorize && Leaves.hasConst()) {
LLVM_DEBUG(dbgs() << "--> Pushing constant to tip of tree.");
Leaves.pushToBottom(Leaves.pop());
}
const DataLayout &DL = CurDAG->getDataLayout();
const TargetLowering &TLI = *getTargetLowering();
// Rebuild the tree using Huffman's algorithm
while (Leaves.size() > 1) {
WeightedLeaf L0 = Leaves.pop();
// See whether we can grab a MUL to form an add(Rx,mpyi(Ry,#u6)),
// otherwise just get the next leaf
WeightedLeaf L1 = Leaves.findMULbyConst();
if (!L1.Value.getNode())
L1 = Leaves.pop();
assert(L0.Weight <= L1.Weight && "Priority queue is broken!");
SDValue V0 = L0.Value;
int V0Weight = L0.Weight;
SDValue V1 = L1.Value;
int V1Weight = L1.Weight;
// Make sure that none of these nodes have been RAUW'd
if ((RootWeights.count(V0.getNode()) && RootWeights[V0.getNode()] == -2) ||
(RootWeights.count(V1.getNode()) && RootWeights[V1.getNode()] == -2)) {
LLVM_DEBUG(dbgs() << "--> Subtree was RAUWd. Restarting...\n");
return balanceSubTree(N, TopLevel);
}
ConstantSDNode *V0C = dyn_cast<ConstantSDNode>(V0);
ConstantSDNode *V1C = dyn_cast<ConstantSDNode>(V1);
EVT VT = N->getValueType(0);
SDValue NewNode;
if (V0C && !V1C) {
std::swap(V0, V1);
std::swap(V0C, V1C);
}
// Calculate height of this node
assert(NodeHeights.count(V0) && NodeHeights.count(V1) &&
"Children must have been visited before re-combining them!");
int Height = std::max(NodeHeights[V0], NodeHeights[V1]) + 1;
// Rebuild this node (and restore SHL from MUL if needed)
if (V1C && NOpcode == ISD::MUL && V1C->getAPIntValue().isPowerOf2())
NewNode = CurDAG->getNode(
ISD::SHL, SDLoc(V0), VT, V0,
CurDAG->getConstant(
V1C->getAPIntValue().logBase2(), SDLoc(N),
TLI.getScalarShiftAmountTy(DL, V0.getValueType())));
else
NewNode = CurDAG->getNode(NOpcode, SDLoc(N), VT, V0, V1);
NodeHeights[NewNode] = Height;
int Weight = V0Weight + V1Weight;
Leaves.push(WeightedLeaf(NewNode, Weight, L0.InsertionOrder));
LLVM_DEBUG(dbgs() << "--> Built new node (Weight=" << Weight
<< ",Height=" << Height << "):\n");
LLVM_DEBUG(NewNode.dump());
}
assert(Leaves.size() == 1);
SDValue NewRoot = Leaves.top().Value;
assert(NodeHeights.count(NewRoot));
int Height = NodeHeights[NewRoot];
// Restore SHL if we earlier converted it to a MUL
if (NewRoot.getOpcode() == ISD::MUL) {
ConstantSDNode *V1C = dyn_cast<ConstantSDNode>(NewRoot.getOperand(1));
if (V1C && V1C->getAPIntValue().isPowerOf2()) {
EVT VT = NewRoot.getValueType();
SDValue V0 = NewRoot.getOperand(0);
NewRoot = CurDAG->getNode(
ISD::SHL, SDLoc(NewRoot), VT, V0,
CurDAG->getConstant(
V1C->getAPIntValue().logBase2(), SDLoc(NewRoot),
TLI.getScalarShiftAmountTy(DL, V0.getValueType())));
}
}
if (N != NewRoot.getNode()) {
LLVM_DEBUG(dbgs() << "--> Root is now: ");
LLVM_DEBUG(NewRoot.dump());
// Replace all uses of old root by new root
CurDAG->ReplaceAllUsesWith(N, NewRoot.getNode());
// Mark that we have RAUW'd N
RootWeights[N] = -2;
} else {
LLVM_DEBUG(dbgs() << "--> Root unchanged.\n");
}
RootWeights[NewRoot.getNode()] = Leaves.top().Weight;
RootHeights[NewRoot.getNode()] = Height;
return NewRoot;
}
void HexagonDAGToDAGISel::rebalanceAddressTrees() {
for (auto I = CurDAG->allnodes_begin(), E = CurDAG->allnodes_end(); I != E;) {
SDNode *N = &*I++;
if (N->getOpcode() != ISD::LOAD && N->getOpcode() != ISD::STORE)
continue;
SDValue BasePtr = cast<MemSDNode>(N)->getBasePtr();
if (BasePtr.getOpcode() != ISD::ADD)
continue;
// We've already processed this node
if (RootWeights.count(BasePtr.getNode()))
continue;
LLVM_DEBUG(dbgs() << "** Rebalancing address calculation in node: ");
LLVM_DEBUG(N->dump(CurDAG));
// FindRoots
SmallVector<SDNode *, 4> Worklist;
Worklist.push_back(BasePtr.getOperand(0).getNode());
Worklist.push_back(BasePtr.getOperand(1).getNode());
while (!Worklist.empty()) {
SDNode *N = Worklist.pop_back_val();
unsigned Opcode = N->getOpcode();
if (!isOpcodeHandled(N))
continue;
Worklist.push_back(N->getOperand(0).getNode());
Worklist.push_back(N->getOperand(1).getNode());
// Not a root if it has only one use and same opcode as its parent
if (N->hasOneUse() && Opcode == N->use_begin()->getOpcode())
continue;
// This root node has already been processed
if (RootWeights.count(N))
continue;
RootWeights[N] = -1;
}
// Balance node itself
RootWeights[BasePtr.getNode()] = -1;
SDValue NewBasePtr = balanceSubTree(BasePtr.getNode(), /*TopLevel=*/ true);
if (N->getOpcode() == ISD::LOAD)
N = CurDAG->UpdateNodeOperands(N, N->getOperand(0),
NewBasePtr, N->getOperand(2));
else
N = CurDAG->UpdateNodeOperands(N, N->getOperand(0), N->getOperand(1),
NewBasePtr, N->getOperand(3));
LLVM_DEBUG(dbgs() << "--> Final node: ");
LLVM_DEBUG(N->dump(CurDAG));
}
CurDAG->RemoveDeadNodes();
GAUsesInFunction.clear();
RootHeights.clear();
RootWeights.clear();
}
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