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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
| //===-- CodeTemplate.h ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// A set of structures and functions to craft instructions for the
/// SnippetGenerator.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
#define LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
#include "MCInstrDescView.h"
#include "llvm/ADT/BitmaskEnum.h"
namespace llvm {
namespace exegesis {
// A template for an Instruction holding values for each of its Variables.
struct InstructionTemplate {
InstructionTemplate(const Instruction &Instr);
InstructionTemplate(const InstructionTemplate &); // default
InstructionTemplate &operator=(const InstructionTemplate &); // default
InstructionTemplate(InstructionTemplate &&); // default
InstructionTemplate &operator=(InstructionTemplate &&); // default
unsigned getOpcode() const;
MCOperand &getValueFor(const Variable &Var);
const MCOperand &getValueFor(const Variable &Var) const;
MCOperand &getValueFor(const Operand &Op);
const MCOperand &getValueFor(const Operand &Op) const;
bool hasImmediateVariables() const;
// Builds an MCInst from this InstructionTemplate setting its operands
// to the corresponding variable values. Precondition: All VariableValues must
// be set.
MCInst build() const;
Instruction Instr;
SmallVector<MCOperand, 4> VariableValues;
};
enum class ExecutionMode : uint8_t {
UNKNOWN = 0U,
// The instruction is always serial because implicit Use and Def alias.
// e.g. AAA (alias via EFLAGS)
ALWAYS_SERIAL_IMPLICIT_REGS_ALIAS = 1u << 0,
// The instruction is always serial because one Def is tied to a Use.
// e.g. AND32ri (alias via tied GR32)
ALWAYS_SERIAL_TIED_REGS_ALIAS = 1u << 1,
// The execution can be made serial by inserting a second instruction that
// clobbers/reads memory.
// e.g. MOV8rm
SERIAL_VIA_MEMORY_INSTR = 1u << 2,
// The execution can be made serial by picking one Def that aliases with one
// Use.
// e.g. VXORPSrr XMM1, XMM1, XMM2
SERIAL_VIA_EXPLICIT_REGS = 1u << 3,
// The execution can be made serial by inserting a second instruction that
// uses one of the Defs and defs one of the Uses.
// e.g.
// 1st instruction: MMX_PMOVMSKBrr ECX, MM7
// 2nd instruction: MMX_MOVD64rr MM7, ECX
// or instruction: MMX_MOVD64to64rr MM7, ECX
// or instruction: MMX_PINSRWrr MM7, MM7, ECX, 1
SERIAL_VIA_NON_MEMORY_INSTR = 1u << 4,
// The execution is always parallel because the instruction is missing Use or
// Def operands.
ALWAYS_PARALLEL_MISSING_USE_OR_DEF = 1u << 5,
// The execution can be made parallel by repeating the same instruction but
// making sure that Defs of one instruction do not alias with Uses of the
// second one.
PARALLEL_VIA_EXPLICIT_REGS = 1u << 6,
LLVM_MARK_AS_BITMASK_ENUM(/*Largest*/ PARALLEL_VIA_EXPLICIT_REGS)
};
// Returns whether Execution is one of the values defined in the enum above.
bool isEnumValue(ExecutionMode Execution);
// Returns a human readable string for the enum.
StringRef getName(ExecutionMode Execution);
// Returns a sequence of increasing powers of two corresponding to all the
// Execution flags.
ArrayRef<ExecutionMode> getAllExecutionBits();
// Decomposes Execution into individual set bits.
SmallVector<ExecutionMode, 4> getExecutionModeBits(ExecutionMode);
LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
// A CodeTemplate is a set of InstructionTemplates that may not be fully
// specified (i.e. some variables are not yet set). This allows the
// SnippetGenerator to instantiate it many times with specific values to study
// their impact on instruction's performance.
struct CodeTemplate {
CodeTemplate() = default;
CodeTemplate(CodeTemplate &&); // default
CodeTemplate &operator=(CodeTemplate &&); // default
CodeTemplate(const CodeTemplate &) = delete;
CodeTemplate &operator=(const CodeTemplate &) = delete;
ExecutionMode Execution = ExecutionMode::UNKNOWN;
// See InstructionBenchmarkKey.::Config.
std::string Config;
// Some information about how this template has been created.
std::string Info;
// The list of the instructions for this template.
std::vector<InstructionTemplate> Instructions;
// If the template uses the provided scratch memory, the register in which
// the pointer to this memory is passed in to the function.
unsigned ScratchSpacePointerInReg = 0;
};
} // namespace exegesis
} // namespace llvm
#endif // LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
|