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use moveBefore instead of remove+insert, it avoids some

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symtab manipulation, so its faster (in addition to being
more elegant)

llvm-svn: 112450
This commit is contained in:
Chris Lattner 2010-08-29 18:18:40 +00:00
parent 5c31ee4663
commit aac9263929
1 changed files with 3 additions and 9 deletions
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12
lib/Transforms/Scalar/LICM.cpp
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@ -474,9 +474,7 @@ void LICM::sink(Instruction &I) {
} else {
// Move the instruction to the start of the exit block, after any PHI
// nodes in it.
I.removeFromParent();
BasicBlock::iterator InsertPt = ExitBlocks[0]->getFirstNonPHI();
ExitBlocks[0]->getInstList().insert(InsertPt, &I);
I.moveBefore(ExitBlocks[0]->getFirstNonPHI());
// This instruction is no longer in the AST for the current loop, because
// we just sunk it out of the loop. If we just sunk it into an outer
@ -574,12 +572,8 @@ 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);
// 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;