Elaborate why we have an option on by default for enabling chr.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358641 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Passes/PassBuilder.cpp b/lib/Passes/PassBuilder.cpp
index 074abeb..92d6dbc 100644
--- a/lib/Passes/PassBuilder.cpp
+++ b/lib/Passes/PassBuilder.cpp
@@ -209,6 +209,8 @@
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/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index cecbccb..745f663 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -139,6 +139,8 @@
"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)"));
