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https://github.com/c64scene-ar/llvm-6502.git
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e153fb33e4
This adds support for an indexed instrumentation based profiling format, which is just a small header and an on disk hash table. This format will be used by clang's -fprofile-instr-use= for PGO. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206656 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
//=-- InstrProfIndexed.h - Indexed profiling format support -------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Shared header for the instrumented profile data reader and writer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
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#define LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
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#include "llvm/Support/MD5.h"
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namespace llvm {
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namespace IndexedInstrProf {
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enum class HashT : uint32_t {
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MD5,
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Last = MD5
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};
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static inline uint64_t MD5Hash(StringRef Str) {
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MD5 Hash;
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Hash.update(Str);
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llvm::MD5::MD5Result Result;
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Hash.final(Result);
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// Return the least significant 8 bytes. Our MD5 implementation returns the
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// result in little endian, so we may need to swap bytes.
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using namespace llvm::support;
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return endian::read<uint64_t, little, unaligned>(Result);
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}
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uint64_t ComputeHash(HashT Type, StringRef K) {
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switch (Type) {
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case HashT::MD5:
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return IndexedInstrProf::MD5Hash(K);
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}
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llvm_unreachable("Unhandled hash type");
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}
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const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
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const uint64_t Version = 1;
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const HashT HashType = HashT::MD5;
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}
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} // end namespace llvm
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#endif // LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
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