From 1dfb06d0b40e875d524b2b43fc95ce81a41ce014 Mon Sep 17 00:00:00 2001
From: Philip Reames <listmail@philipreames.com>
Date: Thu, 18 Feb 2021 08:50:00 -0800
Subject: [PATCH] [regalloc] Add a couple of dump routines for ease of
 debugging [NFC]

---
 llvm/lib/CodeGen/SpillPlacement.cpp | 24 ++++++++++++++++++++++++
 llvm/lib/CodeGen/SpillPlacement.h   |  3 +++
 llvm/lib/CodeGen/SplitKit.cpp       | 13 +++++++++++++
 llvm/lib/CodeGen/SplitKit.h         |  3 +++
 4 files changed, 43 insertions(+)

diff --git a/llvm/lib/CodeGen/SpillPlacement.cpp b/llvm/lib/CodeGen/SpillPlacement.cpp
index 4bb50a285497..b1597519f6bc 100644
--- a/llvm/lib/CodeGen/SpillPlacement.cpp
+++ b/llvm/lib/CodeGen/SpillPlacement.cpp
@@ -377,3 +377,27 @@ SpillPlacement::finish() {
   ActiveNodes = nullptr;
   return Perfect;
 }
+
+void SpillPlacement::BlockConstraint::print(raw_ostream &OS) const {
+  auto toString = [](BorderConstraint C) -> StringRef {
+    switch(C) {
+    case DontCare: return "DontCare";
+    case PrefReg: return "PrefReg";
+    case PrefSpill: return "PrefSpill";
+    case PrefBoth: return "PrefBoth";
+    case MustSpill: return "MustSpill";
+    default:
+      llvm_unreachable("uncovered switch");
+    };
+  };
+
+  dbgs() << "{" << Number << ", "
+         << toString(Entry) << ", "
+         << toString(Exit) << ", "
+         << (ChangesValue ? "changes" : "no change") << "}";
+}
+
+void SpillPlacement::BlockConstraint::dump() const {
+  print(dbgs());
+  dbgs() << "\n";
+}
diff --git a/llvm/lib/CodeGen/SpillPlacement.h b/llvm/lib/CodeGen/SpillPlacement.h
index aa0e07ef92e3..d2273a163025 100644
--- a/llvm/lib/CodeGen/SpillPlacement.h
+++ b/llvm/lib/CodeGen/SpillPlacement.h
@@ -95,6 +95,9 @@ public:
     /// the block has a non-PHI def.  When this is false, a live-in value on
     /// the stack can be live-out on the stack without inserting a spill.
     bool ChangesValue;
+
+    void print(raw_ostream &OS) const;
+    void dump() const;
   };
 
   /// prepare - Reset state and prepare for a new spill placement computation.
diff --git a/llvm/lib/CodeGen/SplitKit.cpp b/llvm/lib/CodeGen/SplitKit.cpp
index 8ffba4a47a46..ff993b4654d2 100644
--- a/llvm/lib/CodeGen/SplitKit.cpp
+++ b/llvm/lib/CodeGen/SplitKit.cpp
@@ -1812,3 +1812,16 @@ void SplitEditor::splitRegOutBlock(const SplitAnalysis::BlockInfo &BI,
   SlotIndex From = enterIntvBefore(std::min(Idx, BI.FirstInstr));
   useIntv(From, Idx);
 }
+
+void SplitAnalysis::BlockInfo::print(raw_ostream &OS) const {
+  OS << "{" << printMBBReference(*MBB) << ", "
+     << "uses " << FirstInstr << " to " << LastInstr << ", "
+     << "1st def " << FirstDef << ", "
+     << (LiveIn ? "live in" : "dead in") << ", "
+     << (LiveOut ? "live out" : "dead out") << "}";
+}
+
+void SplitAnalysis::BlockInfo::dump() const {
+  print(dbgs());
+  dbgs() << "\n";
+}
diff --git a/llvm/lib/CodeGen/SplitKit.h b/llvm/lib/CodeGen/SplitKit.h
index a94518f5a4fc..ec51014f6fcd 100644
--- a/llvm/lib/CodeGen/SplitKit.h
+++ b/llvm/lib/CodeGen/SplitKit.h
@@ -131,6 +131,9 @@ public:
     bool isOneInstr() const {
       return SlotIndex::isSameInstr(FirstInstr, LastInstr);
     }
+
+    void print(raw_ostream &OS) const;
+    void dump() const;
   };
 
 private: