[LTO] Support filtering by hotness threshold

This wires up -pass-remarks-hotness-threshold to LTO and ThinLTO.

Next is to change the clang driver to pass this
with -fdiagnostics-hotness-threshold.

Differential Revision: https://reviews.llvm.org/D41465

llvm-svn: 326107

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/LTO/LTOCodeGenerator.cpp b/llvm/lib/LTO/LTOCodeGenerator.cpp
index ffe9af74cdc..939d12a20be 100644
--- a/llvm/lib/LTO/LTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/LTOCodeGenerator.cpp
@@ -89,6 +89,12 @@ cl::opt<bool> LTOPassRemarksWithHotness(
     "lto-pass-remarks-with-hotness",
     cl::desc("With PGO, include profile count in optimization remarks"),
     cl::Hidden);
+
+cl::opt<unsigned> LTOPassRemarksHotnessThreshold(
+    "lto-pass-remarks-hotness-threshold",
+    cl::desc("Minimum profile count required for an optimization remark to be "
+             "output"),
+    cl::Hidden);
 }
 
 LTOCodeGenerator::LTOCodeGenerator(LLVMContext &Context)
@@ -505,7 +511,8 @@ bool LTOCodeGenerator::optimize(bool DisableVerify, bool DisableInline,
     return false;
 
   auto DiagFileOrErr = lto::setupOptimizationRemarks(
-      Context, LTORemarksFilename, LTOPassRemarksWithHotness);
+      Context, LTORemarksFilename, LTOPassRemarksWithHotness,
+      LTOPassRemarksHotnessThreshold);
   if (!DiagFileOrErr) {
     errs() << "Error: " << toString(DiagFileOrErr.takeError()) << "\n";
     report_fatal_error("Can't get an output file for the remarks");