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
diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index 40d8305..89e3e23 100644
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -102,6 +102,10 @@
///
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 1fe7a2c..e8738d2 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -68,6 +68,12 @@
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.