diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -175,12 +175,12 @@
 // Disable MIRProfileLoader before RegAlloc. This is for for debugging and
 // tuning purpose.
 static cl::opt<bool> DisableRAFSProfileLoader(
-    "disable-ra-fsprofile-loader", cl::init(true), cl::Hidden,
+    "disable-ra-fsprofile-loader", cl::init(false), cl::Hidden,
     cl::desc("Disable MIRProfileLoader before RegAlloc"));
 // Disable MIRProfileLoader before BloackPlacement. This is for for debugging
 // and tuning purpose.
 static cl::opt<bool> DisableLayoutFSProfileLoader(
-    "disable-layout-fsprofile-loader", cl::init(true), cl::Hidden,
+    "disable-layout-fsprofile-loader", cl::init(false), cl::Hidden,
     cl::desc("Disable MIRProfileLoader before BlockPlacement"));
 // Specify FSProfile file name.
 static cl::opt<std::string>