Minor Instr PGO code restructuring

1. Key constant values (version, magic) and data structures related to raw and 
   indexed profile format are moved into one centralized file: InstrProf.h.
2. Utility function such as MD5Hash computation is also moved to the common 
   header to allow sharing with other components in the future.
3. A header data structure is introduced for Indexed format so that the reader
   and writer can always be in sync.
4. Added some comments to document different places where multiple definition
   of the data structure must be kept in sync (reader/writer, runtime, lowering 
   etc).  No functional change is intended.

Differential Revision:  http://reviews.llvm.org/D13758

llvm-svn: 250638

1 files changed, 0 insertions, 56 deletions

diff --git a/llvm/lib/ProfileData/InstrProfIndexed.h b/llvm/lib/ProfileData/InstrProfIndexed.h
deleted file mode 100644
index fe0b04ed008..00000000000
--- a/llvm/lib/ProfileData/InstrProfIndexed.h
+++ /dev/null
@@ -1,56 +0,0 @@
-//=-- InstrProfIndexed.h - Indexed profiling format support -------*- C++ -*-=//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Shared header for the instrumented profile data reader and writer.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIB_PROFILEDATA_INSTRPROFINDEXED_H
-#define LLVM_LIB_PROFILEDATA_INSTRPROFINDEXED_H
-
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MD5.h"
-
-namespace llvm {
-
-namespace IndexedInstrProf {
-enum class HashT : uint32_t {
-  MD5,
-
-  Last = MD5
-};
-
-static inline uint64_t MD5Hash(StringRef Str) {
-  MD5 Hash;
-  Hash.update(Str);
-  llvm::MD5::MD5Result Result;
-  Hash.final(Result);
-  // Return the least significant 8 bytes. Our MD5 implementation returns the
-  // result in little endian, so we may need to swap bytes.
-  using namespace llvm::support;
-  return endian::read<uint64_t, little, unaligned>(Result);
-}
-
-static inline uint64_t ComputeHash(HashT Type, StringRef K) {
-  switch (Type) {
-  case HashT::MD5:
-    return IndexedInstrProf::MD5Hash(K);
-  }
-  llvm_unreachable("Unhandled hash type");
-}
-
-const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
-const uint64_t Version = 3;
-const HashT HashType = HashT::MD5;
-}
-
-} // end namespace llvm
-
-#endif