Add a hidden command line option to display edge bundle graphs as they are

calculated.

llvm-svn: 122912

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/EdgeBundles.cpp b/llvm/lib/CodeGen/EdgeBundles.cpp
index d7e73d160eb..aed8bc94799 100644
--- a/llvm/lib/CodeGen/EdgeBundles.cpp
+++ b/llvm/lib/CodeGen/EdgeBundles.cpp
@@ -15,10 +15,15 @@
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/GraphWriter.h"
 
 using namespace llvm;
 
+static cl::opt<bool>
+ViewEdgeBundles("view-edge-bundles", cl::Hidden,
+                cl::desc("Pop up a window to show edge bundle graphs"));
+
 char EdgeBundles::ID = 0;
 
 INITIALIZE_PASS(EdgeBundles, "edge-bundles", "Bundle Machine CFG Edges",
@@ -46,6 +51,8 @@ bool EdgeBundles::runOnMachineFunction(MachineFunction &mf) {
       EC.join(OutE, 2 * (*SI)->getNumber());
   }
   EC.compress();
+  if (ViewEdgeBundles)
+    view();
   return false;
 }