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0c049ea60a
All users of MCCodeEmitter::encodeInstruction use a raw_svector_ostream to encode the instruction into a SmallVector. The raw_ostream however incurs some overhead for the actual encoding. This change allows an MCCodeEmitter to directly emit an instruction into a SmallVector without using a raw_ostream and therefore allow for performance improvments in encoding. A default path that uses existing raw_ostream implementations is provided. Reviewed By: MaskRay, Amir Differential Revision: https://reviews.llvm.org/D145791
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
//===--------------------- CodeEmitter.cpp ----------------------*- 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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// This file implements the CodeEmitter API.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MCA/CodeEmitter.h"
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namespace llvm {
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namespace mca {
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CodeEmitter::EncodingInfo CodeEmitter::getOrCreateEncodingInfo(unsigned MCID) {
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EncodingInfo &EI = Encodings[MCID];
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if (EI.second)
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return EI;
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SmallVector<llvm::MCFixup, 2> Fixups;
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const MCInst &Inst = Sequence[MCID];
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MCInst Relaxed(Sequence[MCID]);
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if (MAB.mayNeedRelaxation(Inst, STI))
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MAB.relaxInstruction(Relaxed, STI);
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EI.first = Code.size();
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MCE.encodeInstruction(Relaxed, Code, Fixups, STI);
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EI.second = Code.size() - EI.first;
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return EI;
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}
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} // namespace mca
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} // namespace llvm
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