llvm16 targets

1 files changed, 270 insertions, 0 deletions

diff --git a/contrib/libs/llvm16/lib/Target/ARM/ARMHazardRecognizer.cpp b/contrib/libs/llvm16/lib/Target/ARM/ARMHazardRecognizer.cpp
new file mode 100644
index 00000000000..9b26aac6c0b
--- /dev/null
+++ b/contrib/libs/llvm16/lib/Target/ARM/ARMHazardRecognizer.cpp
@@ -0,0 +1,270 @@
+//===-- ARMHazardRecognizer.cpp - ARM postra hazard recognizer ------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARMHazardRecognizer.h"
+#include "ARMBaseInstrInfo.h"
+#include "ARMBaseRegisterInfo.h"
+#include "ARMSubtarget.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/ScheduleDAG.h"
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace llvm;
+
+static cl::opt<int> DataBankMask("arm-data-bank-mask", cl::init(-1),
+                                 cl::Hidden);
+static cl::opt<bool> AssumeITCMConflict("arm-assume-itcm-bankconflict",
+                                        cl::init(false), cl::Hidden);
+
+static bool hasRAWHazard(MachineInstr *DefMI, MachineInstr *MI,
+                         const TargetRegisterInfo &TRI) {
+  // FIXME: Detect integer instructions properly.
+  const MCInstrDesc &MCID = MI->getDesc();
+  unsigned Domain = MCID.TSFlags & ARMII::DomainMask;
+  if (MI->mayStore())
+    return false;
+  unsigned Opcode = MCID.getOpcode();
+  if (Opcode == ARM::VMOVRS || Opcode == ARM::VMOVRRD)
+    return false;
+  if ((Domain & ARMII::DomainVFP) || (Domain & ARMII::DomainNEON))
+    return MI->readsRegister(DefMI->getOperand(0).getReg(), &TRI);
+  return false;
+}
+
+ScheduleHazardRecognizer::HazardType
+ARMHazardRecognizerFPMLx::getHazardType(SUnit *SU, int Stalls) {
+  assert(Stalls == 0 && "ARM hazards don't support scoreboard lookahead");
+
+  MachineInstr *MI = SU->getInstr();
+
+  if (!MI->isDebugInstr()) {
+    // Look for special VMLA / VMLS hazards. A VMUL / VADD / VSUB following
+    // a VMLA / VMLS will cause 4 cycle stall.
+    const MCInstrDesc &MCID = MI->getDesc();
+    if (LastMI && (MCID.TSFlags & ARMII::DomainMask) != ARMII::DomainGeneral) {
+      MachineInstr *DefMI = LastMI;
+      const MCInstrDesc &LastMCID = LastMI->getDesc();
+      const MachineFunction *MF = MI->getParent()->getParent();
+      const ARMBaseInstrInfo &TII = *static_cast<const ARMBaseInstrInfo *>(
+                                        MF->getSubtarget().getInstrInfo());
+
+      // Skip over one non-VFP / NEON instruction.
+      if (!LastMI->isBarrier() &&
+          !(TII.getSubtarget().hasMuxedUnits() && LastMI->mayLoadOrStore()) &&
+          (LastMCID.TSFlags & ARMII::DomainMask) == ARMII::DomainGeneral) {
+        MachineBasicBlock::iterator I = LastMI;
+        if (I != LastMI->getParent()->begin()) {
+          I = std::prev(I);
+          DefMI = &*I;
+        }
+      }
+
+      if (TII.isFpMLxInstruction(DefMI->getOpcode()) &&
+          (TII.canCauseFpMLxStall(MI->getOpcode()) ||
+           hasRAWHazard(DefMI, MI, TII.getRegisterInfo()))) {
+        // Try to schedule another instruction for the next 4 cycles.
+        if (FpMLxStalls == 0)
+          FpMLxStalls = 4;
+        return Hazard;
+      }
+    }
+  }
+  return NoHazard;
+}
+
+void ARMHazardRecognizerFPMLx::Reset() {
+  LastMI = nullptr;
+  FpMLxStalls = 0;
+}
+
+void ARMHazardRecognizerFPMLx::EmitInstruction(SUnit *SU) {
+  MachineInstr *MI = SU->getInstr();
+  if (!MI->isDebugInstr()) {
+    LastMI = MI;
+    FpMLxStalls = 0;
+  }
+}
+
+void ARMHazardRecognizerFPMLx::AdvanceCycle() {
+  if (FpMLxStalls && --FpMLxStalls == 0)
+    // Stalled for 4 cycles but still can't schedule any other instructions.
+    LastMI = nullptr;
+}
+
+void ARMHazardRecognizerFPMLx::RecedeCycle() {
+  llvm_unreachable("reverse ARM hazard checking unsupported");
+}
+
+///////// Bank conflicts handled as hazards //////////////
+
+static bool getBaseOffset(const MachineInstr &MI, const MachineOperand *&BaseOp,
+                          int64_t &Offset) {
+
+  uint64_t TSFlags = MI.getDesc().TSFlags;
+  unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
+  unsigned IndexMode =
+      (TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
+
+  // Address mode tells us what we want to know about operands for T2
+  // instructions (but not size).  It tells us size (but not about operands)
+  // for T1 instructions.
+  switch (AddrMode) {
+  default:
+    return false;
+  case ARMII::AddrModeT2_i8:
+    // t2LDRBT, t2LDRB_POST, t2LDRB_PRE, t2LDRBi8,
+    // t2LDRHT, t2LDRH_POST, t2LDRH_PRE, t2LDRHi8,
+    // t2LDRSBT, t2LDRSB_POST, t2LDRSB_PRE, t2LDRSBi8,
+    // t2LDRSHT, t2LDRSH_POST, t2LDRSH_PRE, t2LDRSHi8,
+    // t2LDRT, t2LDR_POST, t2LDR_PRE, t2LDRi8
+    BaseOp = &MI.getOperand(1);
+    Offset = (IndexMode == ARMII::IndexModePost)
+                 ? 0
+                 : (IndexMode == ARMII::IndexModePre ||
+                    IndexMode == ARMII::IndexModeUpd)
+                       ? MI.getOperand(3).getImm()
+                       : MI.getOperand(2).getImm();
+    return true;
+  case ARMII::AddrModeT2_i12:
+    // t2LDRBi12, t2LDRHi12
+    // t2LDRSBi12, t2LDRSHi12
+    // t2LDRi12
+    BaseOp = &MI.getOperand(1);
+    Offset = MI.getOperand(2).getImm();
+    return true;
+  case ARMII::AddrModeT2_i8s4:
+    // t2LDRD_POST, t2LDRD_PRE, t2LDRDi8
+    BaseOp = &MI.getOperand(2);
+    Offset = (IndexMode == ARMII::IndexModePost)
+                 ? 0
+                 : (IndexMode == ARMII::IndexModePre ||
+                    IndexMode == ARMII::IndexModeUpd)
+                       ? MI.getOperand(4).getImm()
+                       : MI.getOperand(3).getImm();
+    return true;
+  case ARMII::AddrModeT1_1:
+    // tLDRBi, tLDRBr (watch out!), TLDRSB
+  case ARMII::AddrModeT1_2:
+    // tLDRHi, tLDRHr (watch out!), TLDRSH
+  case ARMII::AddrModeT1_4:
+    // tLDRi, tLDRr (watch out!)
+    BaseOp = &MI.getOperand(1);
+    Offset = MI.getOperand(2).isImm() ? MI.getOperand(2).getImm() : 0;
+    return MI.getOperand(2).isImm();
+  }
+  return false;
+}
+
+ARMBankConflictHazardRecognizer::ARMBankConflictHazardRecognizer(
+    const ScheduleDAG *DAG, int64_t CPUBankMask, bool CPUAssumeITCMConflict)
+    : MF(DAG->MF), DL(DAG->MF.getDataLayout()),
+      DataMask(DataBankMask.getNumOccurrences() ? int64_t(DataBankMask)
+                                                : CPUBankMask),
+      AssumeITCMBankConflict(AssumeITCMConflict.getNumOccurrences()
+                                 ? AssumeITCMConflict
+                                 : CPUAssumeITCMConflict) {
+  MaxLookAhead = 1;
+}
+
+ScheduleHazardRecognizer::HazardType
+ARMBankConflictHazardRecognizer::CheckOffsets(unsigned O0, unsigned O1) {
+  return (((O0 ^ O1) & DataMask) != 0) ? NoHazard : Hazard;
+}
+
+ScheduleHazardRecognizer::HazardType
+ARMBankConflictHazardRecognizer::getHazardType(SUnit *SU, int Stalls) {
+  MachineInstr &L0 = *SU->getInstr();
+  if (!L0.mayLoad() || L0.mayStore() || L0.getNumMemOperands() != 1)
+    return NoHazard;
+
+  auto MO0 = *L0.memoperands().begin();
+  auto BaseVal0 = MO0->getValue();
+  auto BasePseudoVal0 = MO0->getPseudoValue();
+  int64_t Offset0 = 0;
+
+  if (MO0->getSize() > 4)
+    return NoHazard;
+
+  bool SPvalid = false;
+  const MachineOperand *SP = nullptr;
+  int64_t SPOffset0 = 0;
+
+  for (auto L1 : Accesses) {
+    auto MO1 = *L1->memoperands().begin();
+    auto BaseVal1 = MO1->getValue();
+    auto BasePseudoVal1 = MO1->getPseudoValue();
+    int64_t Offset1 = 0;
+
+    // Pointers to the same object
+    if (BaseVal0 && BaseVal1) {
+      const Value *Ptr0, *Ptr1;
+      Ptr0 = GetPointerBaseWithConstantOffset(BaseVal0, Offset0, DL, true);
+      Ptr1 = GetPointerBaseWithConstantOffset(BaseVal1, Offset1, DL, true);
+      if (Ptr0 == Ptr1 && Ptr0)
+        return CheckOffsets(Offset0, Offset1);
+    }
+
+    if (BasePseudoVal0 && BasePseudoVal1 &&
+        BasePseudoVal0->kind() == BasePseudoVal1->kind() &&
+        BasePseudoVal0->kind() == PseudoSourceValue::FixedStack) {
+      // Spills/fills
+      auto FS0 = cast<FixedStackPseudoSourceValue>(BasePseudoVal0);
+      auto FS1 = cast<FixedStackPseudoSourceValue>(BasePseudoVal1);
+      Offset0 = MF.getFrameInfo().getObjectOffset(FS0->getFrameIndex());
+      Offset1 = MF.getFrameInfo().getObjectOffset(FS1->getFrameIndex());
+      return CheckOffsets(Offset0, Offset1);
+    }
+
+    // Constant pools (likely in ITCM)
+    if (BasePseudoVal0 && BasePseudoVal1 &&
+        BasePseudoVal0->kind() == BasePseudoVal1->kind() &&
+        BasePseudoVal0->isConstantPool() && AssumeITCMBankConflict)
+      return Hazard;
+
+    // Is this a stack pointer-relative access?  We could in general try to
+    // use "is this the same register and is it unchanged?", but the
+    // memory operand tracking is highly likely to have already found that.
+    // What we're after here is bank conflicts between different objects in
+    // the stack frame.
+    if (!SPvalid) { // set up SP
+      if (!getBaseOffset(L0, SP, SPOffset0) || SP->getReg().id() != ARM::SP)
+        SP = nullptr;
+      SPvalid = true;
+    }
+    if (SP) {
+      int64_t SPOffset1;
+      const MachineOperand *SP1;
+      if (getBaseOffset(*L1, SP1, SPOffset1) && SP1->getReg().id() == ARM::SP)
+        return CheckOffsets(SPOffset0, SPOffset1);
+    }
+  }
+
+  return NoHazard;
+}
+
+void ARMBankConflictHazardRecognizer::Reset() { Accesses.clear(); }
+
+void ARMBankConflictHazardRecognizer::EmitInstruction(SUnit *SU) {
+  MachineInstr &MI = *SU->getInstr();
+  if (!MI.mayLoad() || MI.mayStore() || MI.getNumMemOperands() != 1)
+    return;
+
+  auto MO = *MI.memoperands().begin();
+  uint64_t Size1 = MO->getSize();
+  if (Size1 > 4)
+    return;
+  Accesses.push_back(&MI);
+}
+
+void ARMBankConflictHazardRecognizer::AdvanceCycle() { Accesses.clear(); }
+
+void ARMBankConflictHazardRecognizer::RecedeCycle() { Accesses.clear(); }