| 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(N: 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 |
| 71 |