Elaborate why we have an option on by default for enabling chr.

llvm-svn: 358641

2 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 074abebb142..92d6dbc2b5a 100644
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -209,6 +209,8 @@ static cl::opt<bool> EnableSyntheticCounts(
 static Regex DefaultAliasRegex(
     "^(default|thinlto-pre-link|thinlto|lto-pre-link|lto)<(O[0123sz])>$");
 
+// This option is used in simplifying testing SampleFDO optimizations for
+// profile loading.
 static cl::opt<bool>
     EnableCHR("enable-chr-npm", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index cecbccb25de..745f663ebdc 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -139,6 +139,8 @@ static cl::opt<bool> EnableGVNSink(
     "enable-gvn-sink", cl::init(false), cl::Hidden,
     cl::desc("Enable the GVN sinking pass (default = off)"));
 
+// This option is used in simplifying testing SampleFDO optimizations for
+// profile loading.
 static cl::opt<bool>
     EnableCHR("enable-chr", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));