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44ebb7579c
This is based on the assumption that most simulated instructions don't define more than one or two registers. This is true for example on x86, where most instruction definitions don't declare more than one register write. The default code region size has been increased from 8 to 16. This is based on the assumption that, for small microbenchmarks, the typical code snippet size is often less than 16 instructions. mca::Instruction now uses bitfields to pack flags. No functional change intended.
131 lines
4.0 KiB
C++
131 lines
4.0 KiB
C++
//===-------------------------- CodeRegion.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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/// \file
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///
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/// This file implements class CodeRegion and CodeRegions.
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///
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/// A CodeRegion describes a region of assembly code guarded by special LLVM-MCA
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/// comment directives.
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///
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/// # LLVM-MCA-BEGIN foo
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/// ... ## asm
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/// # LLVM-MCA-END
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///
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/// A comment starting with substring LLVM-MCA-BEGIN marks the beginning of a
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/// new region of code.
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/// A comment starting with substring LLVM-MCA-END marks the end of the
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/// last-seen region of code.
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///
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/// Code regions are not allowed to overlap. Each region can have a optional
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/// description; internally, regions are described by a range of source
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/// locations (SMLoc objects).
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///
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/// An instruction (a MCInst) is added to a region R only if its location is in
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/// range [R.RangeStart, R.RangeEnd].
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_CODEREGION_H
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#define LLVM_TOOLS_LLVM_MCA_CODEREGION_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/SourceMgr.h"
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#include <vector>
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namespace llvm {
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namespace mca {
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/// A region of assembly code.
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///
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/// It identifies a sequence of machine instructions.
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class CodeRegion {
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// An optional descriptor for this region.
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llvm::StringRef Description;
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// Instructions that form this region.
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llvm::SmallVector<llvm::MCInst, 16> Instructions;
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// Source location range.
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llvm::SMLoc RangeStart;
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llvm::SMLoc RangeEnd;
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CodeRegion(const CodeRegion &) = delete;
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CodeRegion &operator=(const CodeRegion &) = delete;
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public:
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CodeRegion(llvm::StringRef Desc, llvm::SMLoc Start)
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: Description(Desc), RangeStart(Start), RangeEnd() {}
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void addInstruction(const llvm::MCInst &Instruction) {
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Instructions.emplace_back(Instruction);
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}
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llvm::SMLoc startLoc() const { return RangeStart; }
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llvm::SMLoc endLoc() const { return RangeEnd; }
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void setEndLocation(llvm::SMLoc End) { RangeEnd = End; }
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bool empty() const { return Instructions.empty(); }
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bool isLocInRange(llvm::SMLoc Loc) const;
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llvm::ArrayRef<llvm::MCInst> getInstructions() const { return Instructions; }
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llvm::StringRef getDescription() const { return Description; }
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};
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class CodeRegionParseError final : public Error {};
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class CodeRegions {
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// A source manager. Used by the tool to generate meaningful warnings.
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llvm::SourceMgr &SM;
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using UniqueCodeRegion = std::unique_ptr<CodeRegion>;
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std::vector<UniqueCodeRegion> Regions;
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llvm::StringMap<unsigned> ActiveRegions;
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bool FoundErrors;
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CodeRegions(const CodeRegions &) = delete;
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CodeRegions &operator=(const CodeRegions &) = delete;
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public:
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CodeRegions(llvm::SourceMgr &S);
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typedef std::vector<UniqueCodeRegion>::iterator iterator;
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typedef std::vector<UniqueCodeRegion>::const_iterator const_iterator;
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iterator begin() { return Regions.begin(); }
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iterator end() { return Regions.end(); }
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const_iterator begin() const { return Regions.cbegin(); }
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const_iterator end() const { return Regions.cend(); }
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void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc);
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void endRegion(llvm::StringRef Description, llvm::SMLoc Loc);
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void addInstruction(const llvm::MCInst &Instruction);
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llvm::SourceMgr &getSourceMgr() const { return SM; }
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llvm::ArrayRef<llvm::MCInst> getInstructionSequence(unsigned Idx) const {
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return Regions[Idx]->getInstructions();
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}
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bool empty() const {
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return llvm::all_of(Regions, [](const UniqueCodeRegion &Region) {
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return Region->empty();
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});
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}
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bool isValid() const { return !FoundErrors; }
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};
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} // namespace mca
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} // namespace llvm
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#endif
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