1//===--------------------- InstructionInfoView.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 implements the InstructionInfoView API.
11///
12//===----------------------------------------------------------------------===//
13
14#include "Views/InstructionInfoView.h"
15#include "llvm/Support/FormattedStream.h"
16#include "llvm/Support/JSON.h"
17
18namespace llvm {
19namespace mca {
20
21void InstructionInfoView::printView(raw_ostream &OS) const {
22 std::string Buffer;
23 raw_string_ostream TempStream(Buffer);
24
25 ArrayRef<llvm::MCInst> Source = getSource();
26 if (!Source.size())
27 return;
28
29 IIVDVec IIVD(Source.size());
30 collectData(IIVD);
31
32 TempStream << "\n\nInstruction Info:\n";
33 TempStream << "[1]: #uOps\n[2]: Latency\n[3]: RThroughput\n"
34 << "[4]: MayLoad\n[5]: MayStore\n[6]: HasSideEffects (U)\n";
35 if (PrintBarriers) {
36 TempStream << "[7]: LoadBarrier\n[8]: StoreBarrier\n";
37 }
38 if (PrintEncodings) {
39 if (PrintBarriers) {
40 TempStream << "[9]: Encoding Size\n";
41 TempStream << "\n[1] [2] [3] [4] [5] [6] [7] [8] "
42 << "[9] Encodings: Instructions:\n";
43 } else {
44 TempStream << "[7]: Encoding Size\n";
45 TempStream << "\n[1] [2] [3] [4] [5] [6] [7] "
46 << "Encodings: Instructions:\n";
47 }
48 } else {
49 if (PrintBarriers) {
50 TempStream << "\n[1] [2] [3] [4] [5] [6] [7] [8] "
51 << "Instructions:\n";
52 } else {
53 TempStream << "\n[1] [2] [3] [4] [5] [6] "
54 << "Instructions:\n";
55 }
56 }
57
58 for (const auto &[Index, IIVDEntry, Inst] : enumerate(First&: IIVD, Rest&: Source)) {
59 TempStream << ' ' << IIVDEntry.NumMicroOpcodes << " ";
60 if (IIVDEntry.NumMicroOpcodes < 10)
61 TempStream << " ";
62 else if (IIVDEntry.NumMicroOpcodes < 100)
63 TempStream << ' ';
64 TempStream << IIVDEntry.Latency << " ";
65 if (IIVDEntry.Latency < 10)
66 TempStream << " ";
67 else if (IIVDEntry.Latency < 100)
68 TempStream << ' ';
69
70 if (IIVDEntry.RThroughput) {
71 double RT = *IIVDEntry.RThroughput;
72 TempStream << format(Fmt: "%.2f", Vals: RT) << ' ';
73 if (RT < 10.0)
74 TempStream << " ";
75 else if (RT < 100.0)
76 TempStream << ' ';
77 } else {
78 TempStream << " - ";
79 }
80 TempStream << (IIVDEntry.mayLoad ? " * " : " ");
81 TempStream << (IIVDEntry.mayStore ? " * " : " ");
82 TempStream << (IIVDEntry.hasUnmodeledSideEffects ? " U " : " ");
83
84 if (PrintBarriers) {
85 TempStream << (LoweredInsts[Index]->isALoadBarrier() ? " * "
86 : " ");
87 TempStream << (LoweredInsts[Index]->isAStoreBarrier() ? " * "
88 : " ");
89 }
90
91 if (PrintEncodings) {
92 StringRef Encoding(CE.getEncoding(MCID: Index));
93 unsigned EncodingSize = Encoding.size();
94 TempStream << " " << EncodingSize
95 << (EncodingSize < 10 ? " " : " ");
96 TempStream.flush();
97 formatted_raw_ostream FOS(TempStream);
98 for (unsigned i = 0, e = Encoding.size(); i != e; ++i)
99 FOS << format(Fmt: "%02x ", Vals: (uint8_t)Encoding[i]);
100 FOS.PadToColumn(NewCol: 30);
101 FOS.flush();
102 }
103
104 TempStream << printInstructionString(MCI: Inst) << '\n';
105 }
106
107 TempStream.flush();
108 OS << Buffer;
109}
110
111void InstructionInfoView::collectData(
112 MutableArrayRef<InstructionInfoViewData> IIVD) const {
113 const llvm::MCSubtargetInfo &STI = getSubTargetInfo();
114 const MCSchedModel &SM = STI.getSchedModel();
115 for (const auto I : zip(t: getSource(), u&: IIVD)) {
116 const MCInst &Inst = std::get<0>(t: I);
117 InstructionInfoViewData &IIVDEntry = std::get<1>(t: I);
118 const MCInstrDesc &MCDesc = MCII.get(Opcode: Inst.getOpcode());
119
120 // Obtain the scheduling class information from the instruction
121 // and instruments.
122 auto IVecIt = InstToInstruments.find(Val: &Inst);
123 unsigned SchedClassID =
124 IVecIt == InstToInstruments.end()
125 ? MCDesc.getSchedClass()
126 : IM.getSchedClassID(MCII, MCI: Inst, IVec: IVecIt->second);
127 unsigned CPUID = SM.getProcessorID();
128
129 // Try to solve variant scheduling classes.
130 while (SchedClassID && SM.getSchedClassDesc(SchedClassIdx: SchedClassID)->isVariant())
131 SchedClassID =
132 STI.resolveVariantSchedClass(SchedClass: SchedClassID, MI: &Inst, MCII: &MCII, CPUID);
133
134 const MCSchedClassDesc &SCDesc = *SM.getSchedClassDesc(SchedClassIdx: SchedClassID);
135 IIVDEntry.NumMicroOpcodes = SCDesc.NumMicroOps;
136 IIVDEntry.Latency = MCSchedModel::computeInstrLatency(STI, SCDesc);
137 // Add extra latency due to delays in the forwarding data paths.
138 IIVDEntry.Latency += MCSchedModel::getForwardingDelayCycles(
139 Entries: STI.getReadAdvanceEntries(SC: SCDesc));
140 IIVDEntry.RThroughput = MCSchedModel::getReciprocalThroughput(STI, SCDesc);
141 IIVDEntry.mayLoad = MCDesc.mayLoad();
142 IIVDEntry.mayStore = MCDesc.mayStore();
143 IIVDEntry.hasUnmodeledSideEffects = MCDesc.hasUnmodeledSideEffects();
144 }
145}
146
147// Construct a JSON object from a single InstructionInfoViewData object.
148json::Object
149InstructionInfoView::toJSON(const InstructionInfoViewData &IIVD) const {
150 json::Object JO({{.K: "NumMicroOpcodes", .V: IIVD.NumMicroOpcodes},
151 {.K: "Latency", .V: IIVD.Latency},
152 {.K: "mayLoad", .V: IIVD.mayLoad},
153 {.K: "mayStore", .V: IIVD.mayStore},
154 {.K: "hasUnmodeledSideEffects", .V: IIVD.hasUnmodeledSideEffects}});
155 JO.try_emplace(K: "RThroughput", Args: IIVD.RThroughput.value_or(u: 0.0));
156 return JO;
157}
158
159json::Value InstructionInfoView::toJSON() const {
160 ArrayRef<llvm::MCInst> Source = getSource();
161 if (!Source.size())
162 return json::Value(0);
163
164 IIVDVec IIVD(Source.size());
165 collectData(IIVD);
166
167 json::Array InstInfo;
168 for (const auto &I : enumerate(First&: IIVD)) {
169 const InstructionInfoViewData &IIVDEntry = I.value();
170 json::Object JO = toJSON(IIVD: IIVDEntry);
171 JO.try_emplace(K: "Instruction", Args: (unsigned)I.index());
172 InstInfo.push_back(E: std::move(JO));
173 }
174 return json::Object({{.K: "InstructionList", .V: json::Value(std::move(InstInfo))}});
175}
176} // namespace mca.
177} // namespace llvm
178

source code of llvm/tools/llvm-mca/Views/InstructionInfoView.cpp