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//===- SPIRVBinaryUtils.cpp - MLIR SPIR-V Binary Module Utilities ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines common utilities for SPIR-V binary module.
//
//===----------------------------------------------------------------------===//
#include "mlir/Target/SPIRV/SPIRVBinaryUtils.h"
#include "llvm/Config/llvm-config.h" // for LLVM_VERSION_MAJOR
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "spirv-binary-utils"
using namespace mlir;
void spirv::appendModuleHeader(SmallVectorImpl<uint32_t> &header,
spirv::Version version, uint32_t idBound) {
uint32_t majorVersion = 1;
uint32_t minorVersion = 0;
switch (version) {
#define MIN_VERSION_CASE(v) \
case spirv::Version::V_1_##v: \
minorVersion = v; \
break
MIN_VERSION_CASE(0);
MIN_VERSION_CASE(1);
MIN_VERSION_CASE(2);
MIN_VERSION_CASE(3);
MIN_VERSION_CASE(4);
MIN_VERSION_CASE(5);
MIN_VERSION_CASE(6);
#undef MIN_VERSION_CASE
}
// See "2.3. Physical Layout of a SPIR-V Module and Instruction" in the SPIR-V
// spec for the definition of the binary module header.
//
// The first five words of a SPIR-V module must be:
// +-------------------------------------------------------------------------+
// | Magic number |
// +-------------------------------------------------------------------------+
// | Version number (bytes: 0 | major number | minor number | 0) |
// +-------------------------------------------------------------------------+
// | Generator magic number |
// +-------------------------------------------------------------------------+
// | Bound (all result <id>s in the module guaranteed to be less than it) |
// +-------------------------------------------------------------------------+
// | 0 (reserved for instruction schema) |
// +-------------------------------------------------------------------------+
header.push_back(spirv::kMagicNumber);
header.push_back((majorVersion << 16) | (minorVersion << 8));
header.push_back((kGeneratorNumber << 16) | LLVM_VERSION_MAJOR);
header.push_back(idBound); // <id> bound
header.push_back(0); // Schema (reserved word)
}
/// Returns the word-count-prefixed opcode for an SPIR-V instruction.
uint32_t spirv::getPrefixedOpcode(uint32_t wordCount, spirv::Opcode opcode) {
assert(((wordCount >> 16) == 0) && "word count out of range!");
return (wordCount << 16) | static_cast<uint32_t>(opcode);
}
void spirv::encodeStringLiteralInto(SmallVectorImpl<uint32_t> &binary,
StringRef literal) {
// We need to encode the literal and the null termination.
size_t encodingSize = literal.size() / 4 + 1;
size_t sizeOfDataToCopy = literal.size();
if (encodingSize >= kMaxLiteralWordCount) {
// Reserve one word for the null termination.
encodingSize = kMaxLiteralWordCount - 1;
// Do not override the last word (null termination) when copying.
sizeOfDataToCopy = (encodingSize - 1) * 4;
LLVM_DEBUG(llvm::dbgs()
<< "Truncating string literal to max size ("
<< (kMaxLiteralWordCount - 1) << "): " << literal << "\n");
}
size_t bufferStartSize = binary.size();
binary.resize(bufferStartSize + encodingSize, 0);
std::memcpy(binary.data() + bufferStartSize, literal.data(),
sizeOfDataToCopy);
}
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