1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
//===- MCSchedule.cpp - Scheduling ------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the default scheduling model.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCSchedule.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include <type_traits>
using namespace llvm;
static_assert(std::is_pod<MCSchedModel>::value,
"We shouldn't have a static constructor here");
const MCSchedModel MCSchedModel::Default = {DefaultIssueWidth,
DefaultMicroOpBufferSize,
DefaultLoopMicroOpBufferSize,
DefaultLoadLatency,
DefaultHighLatency,
DefaultMispredictPenalty,
false,
true,
0,
nullptr,
nullptr,
0,
0,
nullptr};
int MCSchedModel::computeInstrLatency(const MCSubtargetInfo &STI,
const MCSchedClassDesc &SCDesc) {
int Latency = 0;
for (unsigned DefIdx = 0, DefEnd = SCDesc.NumWriteLatencyEntries;
DefIdx != DefEnd; ++DefIdx) {
// Lookup the definition's write latency in SubtargetInfo.
const MCWriteLatencyEntry *WLEntry =
STI.getWriteLatencyEntry(&SCDesc, DefIdx);
// Early exit if we found an invalid latency.
if (WLEntry->Cycles < 0)
return WLEntry->Cycles;
Latency = std::max(Latency, static_cast<int>(WLEntry->Cycles));
}
return Latency;
}
Optional<double>
MCSchedModel::getReciprocalThroughput(const MCSubtargetInfo &STI,
const MCSchedClassDesc &SCDesc) {
Optional<double> Throughput;
const MCSchedModel &SchedModel = STI.getSchedModel();
for (const MCWriteProcResEntry *WPR = STI.getWriteProcResBegin(&SCDesc),
*WEnd = STI.getWriteProcResEnd(&SCDesc);
WPR != WEnd; ++WPR) {
if (WPR->Cycles) {
unsigned NumUnits =
SchedModel.getProcResource(WPR->ProcResourceIdx)->NumUnits;
double Temp = NumUnits * 1.0 / WPR->Cycles;
Throughput =
Throughput.hasValue() ? std::min(Throughput.getValue(), Temp) : Temp;
}
}
if (Throughput.hasValue())
return 1 / Throughput.getValue();
return Throughput;
}
|
