LLVM 19.0.0git
CodeEmitter.cpp
Go to the documentation of this file.
1//===--------------------- CodeEmitter.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//
9// This file implements the CodeEmitter API.
10//
11//===----------------------------------------------------------------------===//
12
14
15namespace llvm {
16namespace mca {
17
18CodeEmitter::EncodingInfo CodeEmitter::getOrCreateEncodingInfo(unsigned MCID) {
19 EncodingInfo &EI = Encodings[MCID];
20 if (EI.second)
21 return EI;
22
23 SmallVector<llvm::MCFixup, 2> Fixups;
24 const MCInst &Inst = Sequence[MCID];
25 MCInst Relaxed(Sequence[MCID]);
26 if (MAB.mayNeedRelaxation(Inst, STI))
27 MAB.relaxInstruction(Relaxed, STI);
28
29 EI.first = Code.size();
30 MCE.encodeInstruction(Relaxed, Code, Fixups, STI);
31 EI.second = Code.size() - EI.first;
32 return EI;
33}
34
35} // namespace mca
36} // namespace llvm
A utility class used to compute instruction encodings.
std::pair< UnicodeEncodingForm, unsigned > EncodingInfo
EncodingInfo - Holds the encoding type and length of the byte order mark if it exists.
Definition: YAMLParser.cpp:52
virtual void relaxInstruction(MCInst &Inst, const MCSubtargetInfo &STI) const
Relax the instruction in the given fragment to the next wider instruction.
Definition: MCAsmBackend.h:186
virtual bool mayNeedRelaxation(const MCInst &Inst, const MCSubtargetInfo &STI) const
Check whether the given instruction may need relaxation.
Definition: MCAsmBackend.h:163
virtual void encodeInstruction(const MCInst &Inst, SmallVectorImpl< char > &CB, SmallVectorImpl< MCFixup > &Fixups, const MCSubtargetInfo &STI) const =0
Encode the given Inst to bytes and append to CB.
size_t size() const
Definition: SmallVector.h:91
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18