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optimize LICM::hoist to use moveBefore. Correct its updating

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of AST to remove the hoisted instruction from the AST, since it
is no longer in the loop.

llvm-svn: 112448
This commit is contained in:
Chris Lattner 2010-08-29 18:03:33 +00:00
parent 150bdce5c1
commit 8e922b170c
1 changed files with 5 additions and 6 deletions
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11
lib/Transforms/Scalar/LICM.cpp
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@ -574,12 +574,11 @@ void LICM::hoist(Instruction &I) {
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;