lib/MCA/Stages/MicroOpQueueStage.cpp

   1 //===---------------------- MicroOpQueueStage.cpp ---------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 /// \file
   9 ///
  10 /// This file defines the MicroOpQueueStage.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/MCA/Stages/MicroOpQueueStage.h"
  15
  16 namespace llvm {
  17 namespace mca {
  18
  19 #define DEBUG_TYPE "llvm-mca"
  20
  21 Error MicroOpQueueStage::moveInstructions() {
  22   InstRef IR = Buffer[CurrentInstructionSlotIdx];
  23   while (IR && checkNextStage(IR)) {
  24     if (llvm::Error Val = moveToTheNextStage(IR))
  25       return Val;
  26
  27     Buffer[CurrentInstructionSlotIdx].invalidate();
  28     unsigned NormalizedOpcodes = getNormalizedOpcodes(IR);
  29     CurrentInstructionSlotIdx += NormalizedOpcodes;
  30     CurrentInstructionSlotIdx %= Buffer.size();
  31     AvailableEntries += NormalizedOpcodes;
  32     IR = Buffer[CurrentInstructionSlotIdx];
  33   }
  34
  35   return llvm::ErrorSuccess();
  36 }
  37
  38 MicroOpQueueStage::MicroOpQueueStage(unsigned Size, unsigned IPC,
  39                                      bool ZeroLatencyStage)
  40     : NextAvailableSlotIdx(0), CurrentInstructionSlotIdx(0), MaxIPC(IPC),
  41       CurrentIPC(0), IsZeroLatencyStage(ZeroLatencyStage) {
  42   Buffer.resize(Size ? Size : 1);
  43   AvailableEntries = Buffer.size();
  44 }
  45
  46 Error MicroOpQueueStage::execute(InstRef &IR) {
  47   Buffer[NextAvailableSlotIdx] = IR;
  48   unsigned NormalizedOpcodes = getNormalizedOpcodes(IR);
  49   NextAvailableSlotIdx += NormalizedOpcodes;
  50   NextAvailableSlotIdx %= Buffer.size();
  51   AvailableEntries -= NormalizedOpcodes;
  52   ++CurrentIPC;
  53   return llvm::ErrorSuccess();
  54 }
  55
  56 Error MicroOpQueueStage::cycleStart() {
  57   CurrentIPC = 0;
  58   if (!IsZeroLatencyStage)
  59     return moveInstructions();
  60   return llvm::ErrorSuccess();
  61 }
  62
  63 Error MicroOpQueueStage::cycleEnd() {
  64   if (IsZeroLatencyStage)
  65     return moveInstructions();
  66   return llvm::ErrorSuccess();
  67 }
  68
  69 } // namespace mca
  70 } // namespace llvm