[LTOs] Allow generation of hotness information

The flag is passed by the clang driver.

Differential Revision: https://reviews.llvm.org/D27331

llvm-svn: 288519

2 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/LTO/LTOCodeGenerator.cpp b/llvm/lib/LTO/LTOCodeGenerator.cpp
index 5aa91c4c689..6af31e61f94 100644
--- a/llvm/lib/LTO/LTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/LTOCodeGenerator.cpp
@@ -96,6 +96,11 @@ cl::opt<std::string>
     LTORemarksFilename("lto-pass-remarks-output",
                        cl::desc("Output filename for pass remarks"),
                        cl::value_desc("filename"));
+
+cl::opt<bool> LTOPassRemarksWithHotness(
+    "lto-pass-remarks-with-hotness",
+    cl::desc("With PGO, include profile count in optimization remarks"),
+    cl::Hidden);
 }
 
 LTOCodeGenerator::LTOCodeGenerator(LLVMContext &Context)
@@ -513,6 +518,10 @@ bool LTOCodeGenerator::setupOptimizationRemarks() {
     Context.setDiagnosticsOutputFile(
         llvm::make_unique<yaml::Output>(DiagnosticOutputFile->os()));
   }
+
+  if (LTOPassRemarksWithHotness)
+    Context.setDiagnosticHotnessRequested(true);
+
   return true;
 }
 
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index 2a75b8bbef7..ae5d8a0255f 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -65,6 +65,7 @@ namespace llvm {
 // Flags -discard-value-names, defined in LTOCodeGenerator.cpp
 extern cl::opt<bool> LTODiscardValueNames;
 extern cl::opt<std::string> LTORemarksFilename;
+extern cl::opt<bool> LTOPassRemarksWithHotness;
 }
 
 namespace {
@@ -74,6 +75,9 @@ static cl::opt<int>
 
 Expected<std::unique_ptr<tool_output_file>>
 setupOptimizationRemarks(LLVMContext &Ctx, int Count) {
+  if (LTOPassRemarksWithHotness)
+    Ctx.setDiagnosticHotnessRequested(true);
+
   if (LTORemarksFilename.empty())
     return nullptr;