Add EnableIPRA to TargetOptions, and move the cl::opt -enable-ipra to TargetMachine.cpp

Avoid exposing a cl::opt in a public header and instead promote this
option in the API.
Alternatively, we could land the cl::opt in CommandFlags.h so that
it is available to every tool, but we would still have to find an
option for clang.

llvm-svn: 275348

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/Target/TargetMachine.cpp b/llvm/lib/Target/TargetMachine.cpp
index ed2f4fef0f0..82c68505c4e 100644
--- a/llvm/lib/Target/TargetMachine.cpp
+++ b/llvm/lib/Target/TargetMachine.cpp
@@ -31,6 +31,10 @@
 #include "llvm/Target/TargetSubtargetInfo.h"
 using namespace llvm;
 
+cl::opt<bool> EnableIPRA("enable-ipra", cl::init(false), cl::Hidden,
+                         cl::desc("Enable interprocedural register allocation "
+                                  "to reduce load/store at procedure calls."));
+
 //---------------------------------------------------------------------------
 // TargetMachine Class
 //
@@ -40,7 +44,10 @@ TargetMachine::TargetMachine(const Target &T, StringRef DataLayoutString,
                              const TargetOptions &Options)
     : TheTarget(T), DL(DataLayoutString), TargetTriple(TT), TargetCPU(CPU),
       TargetFS(FS), AsmInfo(nullptr), MRI(nullptr), MII(nullptr), STI(nullptr),
-      RequireStructuredCFG(false), Options(Options) {}
+      RequireStructuredCFG(false), Options(Options) {
+  if (EnableIPRA.getNumOccurrences())
+    this->Options.EnableIPRA = EnableIPRA;
+}
 
 TargetMachine::~TargetMachine() {
   delete AsmInfo;