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
16namespace llvm {
17namespace mca {
18
19#define DEBUG_TYPE "llvm-mca"
20
21Error 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
38MicroOpQueueStage::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
46Error 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
56Error MicroOpQueueStage::cycleStart() {
57 CurrentIPC = 0;
58 if (!IsZeroLatencyStage)
59 return moveInstructions();
60 return llvm::ErrorSuccess();
61}
62
63Error MicroOpQueueStage::cycleEnd() {
64 if (IsZeroLatencyStage)
65 return moveInstructions();
66 return llvm::ErrorSuccess();
67}
68
69} // namespace mca
70} // namespace llvm
71