[PATCH] D15829: [PGO] Clang Option that enables IR level PGO instrumentation

[Rong Xu via cfe-commits]

xur updated this revision to Diff 46960.
xur added a comment.

Now http://reviews.llvm.org/D16730 has been committed (as r259811)

Here is the patch that adds cc1 option -fprofile-instrument=llvm to enable IR level PGO generate and use.

The pgo use part of the patch depends http://reviews.llvm.org/D15540 which differentiates the IR level and clang profiles. To detect the profile automatically, we need to first the profile. It can either done in driver or in Clang codegen (lib/CodeGen/CodeGenModule.cpp). If we do this in Clang codegen, we would have to change the Codegen option which does not seem to be a good approach. As a result, we do this in the driver in this patch.

Again like in http://reviews.llvm.org/D16730, this patch won't change any driver (user level) options. Only cc1 options are touched.

Thanks,

-Rong


http://reviews.llvm.org/D15829

Files:
  include/clang/Driver/CC1Options.td
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/BackendUtil.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/Driver/CMakeLists.txt
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/Inputs/pgotestclang.profraw
  test/CodeGen/Inputs/pgotestir.profraw
  test/CodeGen/pgo-instrumentation.c

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