[PGO] clang cc1 option change to enable IR level instrumentation

This patch expands cc1 option -fprofile-instrument= with a new value: -fprofile-instrument=llvm
which enables IR level PGO instrumentation.

Reviewers: davidxl, silvas

Differential Revision: http://reviews.llvm.org/D17622

llvm-svn: 262239

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index f5afc68eddc..8af9c30dca7 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -437,6 +437,12 @@ void EmitAssemblyHelper::CreatePasses(FunctionInfoIndex *FunctionIndex) {
     Options.InstrProfileOutput = CodeGenOpts.InstrProfileOutput;
     MPM->add(createInstrProfilingPass(Options));
   }
+  if (CodeGenOpts.hasProfileIRInstr()) {
+    if (!CodeGenOpts.InstrProfileOutput.empty())
+      PMBuilder.PGOInstrGen = CodeGenOpts.InstrProfileOutput;
+    else
+      PMBuilder.PGOInstrGen = "default.profraw";
+  }
 
   if (!CodeGenOpts.SampleProfileFile.empty())
     MPM->add(createSampleProfileLoaderPass(CodeGenOpts.SampleProfileFile));