From 89bf0a6b05c8c353890c88ed1c10dec96a9a7bd8 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 14 Apr 2008 23:15:07 +0000
Subject: [PATCH] In -view-sunit-dags, display "special" chain dependencies as
 cyan instead of blue to distinguish them from regular dependencies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49696 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/ScheduleDAG.h               | 1 +
 lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/llvm/CodeGen/ScheduleDAG.h b/include/llvm/CodeGen/ScheduleDAG.h
index 12e6c499b7c..ebc21a164ba 100644
--- a/include/llvm/CodeGen/ScheduleDAG.h
+++ b/include/llvm/CodeGen/ScheduleDAG.h
@@ -456,6 +456,7 @@ namespace llvm {
     unsigned getOperand() const { return Operand; }
     const SUnit *getNode() const { return Node; }
     bool isCtrlDep() const { return Node->Preds[Operand].isCtrl; }
+    bool isSpecialDep() const { return Node->Preds[Operand].isSpecial; }
   };
 
   template <> struct GraphTraits<SUnit*> {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index 7779acce634..b07b86eb949 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -283,6 +283,8 @@ namespace llvm {
     /// edge, override this method.
     template<typename EdgeIter>
     static std::string getEdgeAttributes(const void *Node, EdgeIter EI) {
+      if (EI.isSpecialDep())
+        return "color=cyan,style=dashed";
       if (EI.isCtrlDep())
         return "color=blue,style=dashed";
       return "";