Implement the new InsertInstBeforeInst function
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1930 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/TransformInternals.cpp b/lib/Transforms/TransformInternals.cpp
index c09ad3d..9ea053e 100644
--- a/lib/Transforms/TransformInternals.cpp
+++ b/lib/Transforms/TransformInternals.cpp
@@ -67,6 +67,20 @@
ReplaceInstWithInst(BIL, BI, To);
}
+// InsertInstBeforeInst - Insert 'NewInst' into the basic block that 'Existing'
+// is already in, and put it right before 'Existing'. This instruction should
+// only be used when there is no iterator to Existing already around. The
+// returned iterator points to the new instruction.
+//
+BasicBlock::iterator InsertInstBeforeInst(Instruction *NewInst,
+ Instruction *Existing) {
+ BasicBlock *BB = Existing->getParent();
+ BasicBlock::InstListType &BIL = BB->getInstList();
+ BasicBlock::iterator BI = find(BIL.begin(), BIL.end(), Existing);
+ assert(BI != BIL.end() && "Inst not in it's parents BB!");
+ return BIL.insert(BI, NewInst);
+}
+
// getStructOffsetType - Return a vector of offsets that are to be used to index