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141 lines
5.1 KiB
141 lines
5.1 KiB
//===-- CodeTemplate.h ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// A set of structures and functions to craft instructions for the
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/// SnippetGenerator.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
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#include "MCInstrDescView.h"
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#include "llvm/ADT/BitmaskEnum.h"
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namespace llvm {
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namespace exegesis {
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// A template for an Instruction holding values for each of its Variables.
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struct InstructionTemplate {
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InstructionTemplate(const Instruction *Instr);
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InstructionTemplate(const InstructionTemplate &); // default
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InstructionTemplate &operator=(const InstructionTemplate &); // default
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InstructionTemplate(InstructionTemplate &&); // default
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InstructionTemplate &operator=(InstructionTemplate &&); // default
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unsigned getOpcode() const;
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MCOperand &getValueFor(const Variable &Var);
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const MCOperand &getValueFor(const Variable &Var) const;
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MCOperand &getValueFor(const Operand &Op);
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const MCOperand &getValueFor(const Operand &Op) const;
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bool hasImmediateVariables() const;
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const Instruction &getInstr() const { return *Instr; }
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ArrayRef<MCOperand> getVariableValues() const { return VariableValues; }
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void setVariableValues(ArrayRef<MCOperand> NewVariableValues) {
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assert(VariableValues.size() == NewVariableValues.size() &&
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"Value count mismatch");
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VariableValues.assign(NewVariableValues.begin(), NewVariableValues.end());
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}
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// Builds an MCInst from this InstructionTemplate setting its operands
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// to the corresponding variable values. Precondition: All VariableValues must
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// be set.
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MCInst build() const;
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private:
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const Instruction *Instr;
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SmallVector<MCOperand, 4> VariableValues;
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};
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enum class ExecutionMode : uint8_t {
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UNKNOWN = 0U,
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// The instruction is always serial because implicit Use and Def alias.
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// e.g. AAA (alias via EFLAGS)
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ALWAYS_SERIAL_IMPLICIT_REGS_ALIAS = 1u << 0,
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// The instruction is always serial because one Def is tied to a Use.
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// e.g. AND32ri (alias via tied GR32)
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ALWAYS_SERIAL_TIED_REGS_ALIAS = 1u << 1,
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// The execution can be made serial by inserting a second instruction that
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// clobbers/reads memory.
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// e.g. MOV8rm
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SERIAL_VIA_MEMORY_INSTR = 1u << 2,
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// The execution can be made serial by picking one Def that aliases with one
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// Use.
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// e.g. VXORPSrr XMM1, XMM1, XMM2
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SERIAL_VIA_EXPLICIT_REGS = 1u << 3,
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// The execution can be made serial by inserting a second instruction that
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// uses one of the Defs and defs one of the Uses.
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// e.g.
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// 1st instruction: MMX_PMOVMSKBrr ECX, MM7
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// 2nd instruction: MMX_MOVD64rr MM7, ECX
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// or instruction: MMX_MOVD64to64rr MM7, ECX
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// or instruction: MMX_PINSRWrr MM7, MM7, ECX, 1
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SERIAL_VIA_NON_MEMORY_INSTR = 1u << 4,
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// The execution is always parallel because the instruction is missing Use or
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// Def operands.
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ALWAYS_PARALLEL_MISSING_USE_OR_DEF = 1u << 5,
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// The execution can be made parallel by repeating the same instruction but
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// making sure that Defs of one instruction do not alias with Uses of the
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// second one.
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PARALLEL_VIA_EXPLICIT_REGS = 1u << 6,
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LLVM_MARK_AS_BITMASK_ENUM(/*Largest*/ PARALLEL_VIA_EXPLICIT_REGS)
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};
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// Returns whether Execution is one of the values defined in the enum above.
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bool isEnumValue(ExecutionMode Execution);
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// Returns a human readable string for the enum.
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StringRef getName(ExecutionMode Execution);
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// Returns a sequence of increasing powers of two corresponding to all the
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// Execution flags.
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ArrayRef<ExecutionMode> getAllExecutionBits();
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// Decomposes Execution into individual set bits.
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SmallVector<ExecutionMode, 4> getExecutionModeBits(ExecutionMode);
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LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
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// A CodeTemplate is a set of InstructionTemplates that may not be fully
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// specified (i.e. some variables are not yet set). This allows the
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// SnippetGenerator to instantiate it many times with specific values to study
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// their impact on instruction's performance.
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struct CodeTemplate {
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CodeTemplate() = default;
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CodeTemplate(CodeTemplate &&); // default
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CodeTemplate &operator=(CodeTemplate &&); // default
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CodeTemplate(const CodeTemplate &) = delete;
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CodeTemplate &operator=(const CodeTemplate &) = delete;
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ExecutionMode Execution = ExecutionMode::UNKNOWN;
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// See InstructionBenchmarkKey.::Config.
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std::string Config;
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// Some information about how this template has been created.
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std::string Info;
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// The list of the instructions for this template.
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std::vector<InstructionTemplate> Instructions;
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// If the template uses the provided scratch memory, the register in which
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// the pointer to this memory is passed in to the function.
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unsigned ScratchSpacePointerInReg = 0;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_CODETEMPLATE_H
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