[mips] MipsSETargetLowering now reports DAGCombiner changes when using -debug-only=mips-isel

No test since -debug output is intended for developers and not end-users.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193681 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/Target/Mips/MipsSEISelLowering.cpp b/lib/Target/Mips/MipsSEISelLowering.cpp
index c1f9a1ff5e..fc536bb67c 100644
--- a/lib/Target/Mips/MipsSEISelLowering.cpp
+++ b/lib/Target/Mips/MipsSEISelLowering.cpp
@@ -10,6 +10,7 @@
 // Subclass of MipsTargetLowering specialized for mips32/64.
 //
 //===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "mips-isel"
 #include "MipsSEISelLowering.h"
 #include "MipsRegisterInfo.h"
 #include "MipsTargetMachine.h"
@@ -17,6 +18,7 @@
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Target/TargetInstrInfo.h"
 
 using namespace llvm;
@@ -795,8 +797,14 @@ MipsSETargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const {
     break;
   }
 
-  if (Val.getNode())
+  if (Val.getNode()) {
+    DEBUG(dbgs() << "\nMipsSE DAG Combine:\n";
+          N->printrWithDepth(dbgs(), &DAG);
+          dbgs() << "\n=> \n";
+          Val.getNode()->printrWithDepth(dbgs(), &DAG);
+          dbgs() << "\n");
     return Val;
+  }
 
   return MipsTargetLowering::PerformDAGCombine(N, DCI);
 }