optimize LICM::hoist to use moveBefore. Correct its updating
of AST to remove the hoisted instruction from the AST, since it
is no longer in the loop.
llvm-svn: 112448
diff --git a/llvm/lib/Transforms/Scalar/LICM.cpp b/llvm/lib/Transforms/Scalar/LICM.cpp
index e6a8b2d..a214d96 100644
--- a/llvm/lib/Transforms/Scalar/LICM.cpp
+++ b/llvm/lib/Transforms/Scalar/LICM.cpp
@@ -574,12 +574,11 @@
DEBUG(dbgs() << "LICM hoisting to " << Preheader->getName() << ": "
<< I << "\n");
- // Remove the instruction from its current basic block... but don't delete the
- // instruction.
- I.removeFromParent();
-
- // Insert the new node in Preheader, before the terminator.
- Preheader->getInstList().insert(Preheader->getTerminator(), &I);
+ // The instruction is no longer in this loop.
+ CurAST->deleteValue(&I);
+
+ // Move the new node to the Preheader, before its terminator.
+ I.moveBefore(Preheader->getTerminator());
if (isa<LoadInst>(I)) ++NumMovedLoads;
else if (isa<CallInst>(I)) ++NumMovedCalls;