Add DAG printing for RMW stuff debugging
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84776 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430ISelDAGToDAG.cpp b/lib/Target/MSP430/MSP430ISelDAGToDAG.cpp
index fb841ba..550c468 100644
--- a/lib/Target/MSP430/MSP430ISelDAGToDAG.cpp
+++ b/lib/Target/MSP430/MSP430ISelDAGToDAG.cpp
@@ -26,6 +26,7 @@
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/Target/TargetLowering.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
@@ -34,6 +35,14 @@
using namespace llvm;
+#ifndef NDEBUG
+static cl::opt<bool>
+ViewRMWDAGs("view-msp430-rmw-dags", cl::Hidden,
+ cl::desc("Pop up a window to show isel dags after RMW preprocess"));
+#else
+static const bool ViewRMWDAGs = false;
+#endif
+
STATISTIC(NumLoadMoved, "Number of loads moved below TokenFactor");
/// MSP430DAGToDAGISel - MSP430 specific code to select MSP430 machine
@@ -288,8 +297,15 @@
/// InstructionSelect - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
void MSP430DAGToDAGISel::InstructionSelect() {
+ std::string BlockName;
+ if (ViewRMWDAGs)
+ BlockName = MF->getFunction()->getNameStr() + ":" +
+ BB->getBasicBlock()->getNameStr();
+
PreprocessForRMW();
+ if (ViewRMWDAGs) CurDAG->viewGraph("RMW preprocessed:" + BlockName);
+
DEBUG(errs() << "Selection DAG after RMW preprocessing:\n");
DEBUG(CurDAG->dump());