Add an insertBefore method for attaching previously unattached instructions,

such as those created by clone(), to a basic block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52424 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 10 insertions, 0 deletions

diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index 40d83059fe..89e3e23499 100644
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -102,6 +102,10 @@ public:
   ///
   void eraseFromParent();
 
+  /// insertBefore - Insert an unlinked instructions into a basic block
+  /// immediately before the specified instruction.
+  void insertBefore(Instruction *InsertPos);
+
   /// moveBefore - Unlink this instruction from its current basic block and
   /// insert it into the basic block that MovePos lives in, right before
   /// MovePos.
diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 1fe7a2cc8b..e8738d2ba7 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -68,6 +68,12 @@ void Instruction::eraseFromParent() {
   getParent()->getInstList().erase(this);
 }
 
+/// insertBefore - Insert an unlinked instructions into a basic block
+/// immediately before the specified instruction.
+void Instruction::insertBefore(Instruction *InsertPos) {
+  InsertPos->getParent()->getInstList().insert(InsertPos, this);
+}
+
 /// moveBefore - Unlink this instruction from its current basic block and
 /// insert it into the basic block that MovePos lives in, right before
 /// MovePos.