308571074c
This is an artifact from merging MLIR into LLVM, the file headers are now aligned with the rest of the project.
61 lines
2.9 KiB
C++
61 lines
2.9 KiB
C++
//===- SPIRVBinaryUtils.cpp - MLIR SPIR-V Binary Module Utilities ---------===//
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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 defines common utilities for SPIR-V binary module.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/SPIRV/SPIRVBinaryUtils.h"
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using namespace mlir;
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void spirv::appendModuleHeader(SmallVectorImpl<uint32_t> &header,
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uint32_t idBound) {
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// The major and minor version number for the generated SPIR-V binary.
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// TODO(antiagainst): use target environment to select the version
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constexpr uint8_t kMajorVersion = 1;
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constexpr uint8_t kMinorVersion = 0;
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// See "2.3. Physical Layout of a SPIR-V Module and Instruction" in the SPIR-V
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// spec for the definition of the binary module header.
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//
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// The first five words of a SPIR-V module must be:
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// +-------------------------------------------------------------------------+
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// | Magic number |
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// +-------------------------------------------------------------------------+
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// | Version number (bytes: 0 | major number | minor number | 0) |
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// +-------------------------------------------------------------------------+
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// | Generator magic number |
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// +-------------------------------------------------------------------------+
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// | Bound (all result <id>s in the module guaranteed to be less than it) |
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// +-------------------------------------------------------------------------+
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// | 0 (reserved for instruction schema) |
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// +-------------------------------------------------------------------------+
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header.push_back(spirv::kMagicNumber);
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header.push_back((kMajorVersion << 16) | (kMinorVersion << 8));
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header.push_back(kGeneratorNumber);
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header.push_back(idBound); // <id> bound
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header.push_back(0); // Schema (reserved word)
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}
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/// Returns the word-count-prefixed opcode for an SPIR-V instruction.
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uint32_t spirv::getPrefixedOpcode(uint32_t wordCount, spirv::Opcode opcode) {
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assert(((wordCount >> 16) == 0) && "word count out of range!");
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return (wordCount << 16) | static_cast<uint32_t>(opcode);
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}
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LogicalResult spirv::encodeStringLiteralInto(SmallVectorImpl<uint32_t> &binary,
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StringRef literal) {
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// We need to encode the literal and the null termination.
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auto encodingSize = literal.size() / 4 + 1;
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auto bufferStartSize = binary.size();
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binary.resize(bufferStartSize + encodingSize, 0);
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std::memcpy(binary.data() + bufferStartSize, literal.data(), literal.size());
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return success();
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}
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