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
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
//===- lib/MC/MCSPIRVStreamer.cpp - SPIR-V Object Output ------*- 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 assembles .s files and emits SPIR-V .o object files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSPIRVStreamer.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/TargetRegistry.h"
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using namespace llvm;
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void MCSPIRVStreamer::emitInstToData(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCAssembler &Assembler = getAssembler();
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SmallVector<MCFixup, 0> Fixups;
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SmallString<256> Code;
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Assembler.getEmitter().encodeInstruction(Inst, Code, Fixups, STI);
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// Append the encoded instruction to the current data fragment (or create a
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// new such fragment if the current fragment is not a data fragment).
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MCDataFragment *DF = getOrCreateDataFragment();
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DF->setHasInstructions(STI);
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DF->getContents().append(Code.begin(), Code.end());
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}
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MCStreamer *llvm::createSPIRVStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> &&MAB,
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std::unique_ptr<MCObjectWriter> &&OW,
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std::unique_ptr<MCCodeEmitter> &&CE,
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bool RelaxAll) {
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MCSPIRVStreamer *S = new MCSPIRVStreamer(Context, std::move(MAB),
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std::move(OW), std::move(CE));
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if (RelaxAll)
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S->getAssembler().setRelaxAll(true);
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return S;
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}
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