add new helper function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22698 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 2bce2dcd22..342614ef47 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -65,6 +65,15 @@ void Instruction::eraseFromParent() {
   getParent()->getInstList().erase(this);
 }
 
+/// moveBefore - Unlink this instruction from its current basic block and
+/// insert it into the basic block that MovePos lives in, right before
+/// MovePos.
+void Instruction::moveBefore(Instruction *MovePos) {
+  MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(),
+                                             this);
+}
+
+
 const char *Instruction::getOpcodeName(unsigned OpCode) {
   switch (OpCode) {
   // Terminators