From 68bb60f6a4e0902769f72d1badda4e37cd873ffb Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Sat, 14 Nov 2009 20:09:13 +0000
Subject: [PATCH] Add function to replace a destination MBB in a single jump
 table

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88804 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/MachineJumpTableInfo.h |  5 ++++
 lib/CodeGen/MachineFunction.cpp             | 27 +++++++++++++++------
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/include/llvm/CodeGen/MachineJumpTableInfo.h b/include/llvm/CodeGen/MachineJumpTableInfo.h
index 3ff2f2e8c7a..57c65c80a48 100644
--- a/include/llvm/CodeGen/MachineJumpTableInfo.h
+++ b/include/llvm/CodeGen/MachineJumpTableInfo.h
@@ -69,6 +69,11 @@ public:
   /// the jump tables to branch to New instead.
   bool ReplaceMBBInJumpTables(MachineBasicBlock *Old, MachineBasicBlock *New);
 
+  /// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
+  /// the jump table to branch to New instead.
+  bool ReplaceMBBInJumpTable(unsigned Idx, MachineBasicBlock *Old,
+                             MachineBasicBlock *New);
+
   /// getEntrySize - Returns the size of an individual field in a jump table. 
   ///
   unsigned getEntrySize() const { return EntrySize; }
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index e125638d3a3..3df88fca437 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -545,14 +545,25 @@ MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
                                              MachineBasicBlock *New) {
   assert(Old != New && "Not making a change?");
   bool MadeChange = false;
-  for (size_t i = 0, e = JumpTables.size(); i != e; ++i) {
-    MachineJumpTableEntry &JTE = JumpTables[i];
-    for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
-      if (JTE.MBBs[j] == Old) {
-        JTE.MBBs[j] = New;
-        MadeChange = true;
-      }
-  }
+  for (size_t i = 0, e = JumpTables.size(); i != e; ++i)
+    ReplaceMBBInJumpTable(i, Old, New);
+  return MadeChange;
+}
+
+/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
+/// the jump table to branch to New instead.
+bool
+MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx,
+                                            MachineBasicBlock *Old,
+                                            MachineBasicBlock *New) {
+  assert(Old != New && "Not making a change?");
+  bool MadeChange = false;
+  MachineJumpTableEntry &JTE = JumpTables[Idx];
+  for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
+    if (JTE.MBBs[j] == Old) {
+      JTE.MBBs[j] = New;
+      MadeChange = true;
+    }
   return MadeChange;
 }