[compiler-rt] r264612 - [PGO] Comment how function pointers for indirect calls are mapped to function names

[Adam Nemet via llvm-commits]

Author: anemet
Date: Mon Mar 28 13:29:36 2016
New Revision: 264612

URL: http://llvm.org/viewvc/llvm-project?rev=264612&view=rev
Log:
[PGO] Comment how function pointers for indirect calls are mapped to function names

Summary:
Hopefully this will make it easier for the next person to figure all
this out...

Reviewers: bogner, davidxl

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D18490

Modified:
    compiler-rt/trunk/lib/profile/InstrProfData.inc

Modified: compiler-rt/trunk/lib/profile/InstrProfData.inc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfData.inc?rev=264612&r1=264611&r2=264612&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfData.inc (original)
+++ compiler-rt/trunk/lib/profile/InstrProfData.inc Mon Mar 28 13:29:36 2016
@@ -73,6 +73,8 @@ INSTR_PROF_DATA(const uint64_t, llvm::Ty
 INSTR_PROF_DATA(const IntPtrT, llvm::Type::getInt64PtrTy(Ctx), CounterPtr, \
                 ConstantExpr::getBitCast(CounterPtr, \
                 llvm::Type::getInt64PtrTy(Ctx)))
+// This is used to map function pointers for the indirect call targets to
+// function name hashes during the conversion from raw to merged profile data.
 INSTR_PROF_DATA(const IntPtrT, llvm::Type::getInt8PtrTy(Ctx), FunctionPointer, \
                 FunctionAddr)
 INSTR_PROF_DATA(IntPtrT, llvm::Type::getInt8PtrTy(Ctx), Values, \