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36c19eae27
Just like the encoder directive for variable-length instructions, this patch adds a new decoder directive to allow custom decoder function on an operand. Right now, due to the design of DecoderEmitter each operand can only have a single custom decoder in a given instruction. Differential Revision: https://reviews.llvm.org/D142079
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//===- VarLenCodeEmitterGen.h - CEG for variable-length insts ---*- 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 declare the CodeEmitterGen component for variable-length
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// instructions. See the .cpp file for more details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
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#define LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
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#include "llvm/TableGen/Record.h"
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namespace llvm {
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struct EncodingSegment {
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unsigned BitWidth;
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const Init *Value;
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StringRef CustomEncoder = "";
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StringRef CustomDecoder = "";
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};
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class VarLenInst {
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const RecordVal *TheDef;
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size_t NumBits;
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// Set if any of the segment is not fixed value.
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bool HasDynamicSegment;
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SmallVector<EncodingSegment, 4> Segments;
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void buildRec(const DagInit *DI);
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public:
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VarLenInst() : TheDef(nullptr), NumBits(0U), HasDynamicSegment(false) {}
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explicit VarLenInst(const DagInit *DI, const RecordVal *TheDef);
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/// Number of bits
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size_t size() const { return NumBits; }
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using const_iterator = decltype(Segments)::const_iterator;
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const_iterator begin() const { return Segments.begin(); }
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const_iterator end() const { return Segments.end(); }
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size_t getNumSegments() const { return Segments.size(); }
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bool isFixedValueOnly() const { return !HasDynamicSegment; }
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};
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void emitVarLenCodeEmitter(RecordKeeper &R, raw_ostream &OS);
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} // end namespace llvm
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#endif
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