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https://github.com/c64scene-ar/llvm-6502.git
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4a6fa1390a
This updates the instrumentation based profiling format so that when we have multiple functions with the same name (but different function hashes) we keep all of them instead of rejecting the later ones. There are a number of scenarios where this can come up where it's more useful to keep multiple function profiles: * Name collisions in unrelated libraries that are profiled together. * Multiple "main" functions from multiple tools built against a common library. * Combining profiles from different build configurations (ie, asserts and no-asserts) The profile format now stores the number of counters between the hash and the counts themselves, so that multiple sets of counts can be stored. Since this is backwards incompatible, I've bumped the format version and added some trivial logic to skip this when reading the old format. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214585 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.5 KiB
C++
56 lines
1.5 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/ErrorHandling.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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static inline 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 = 2;
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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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