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use moveBefore instead of remove+insert, it avoids some
symtab manipulation, so its faster (in addition to being more elegant) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112450 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -474,9 +474,7 @@ void LICM::sink(Instruction &I) {
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} else {
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// Move the instruction to the start of the exit block, after any PHI
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// nodes in it.
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I.removeFromParent();
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BasicBlock::iterator InsertPt = ExitBlocks[0]->getFirstNonPHI();
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ExitBlocks[0]->getInstList().insert(InsertPt, &I);
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I.moveBefore(ExitBlocks[0]->getFirstNonPHI());
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// This instruction is no longer in the AST for the current loop, because
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// we just sunk it out of the loop. If we just sunk it into an outer
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@ -574,12 +572,8 @@ void LICM::hoist(Instruction &I) {
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DEBUG(dbgs() << "LICM hoisting to " << Preheader->getName() << ": "
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<< I << "\n");
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// Remove the instruction from its current basic block... but don't delete the
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// instruction.
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I.removeFromParent();
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// Insert the new node in Preheader, before the terminator.
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Preheader->getInstList().insert(Preheader->getTerminator(), &I);
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// Move the new node to the Preheader, before its terminator.
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I.moveBefore(Preheader->getTerminator());
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if (isa<LoadInst>(I)) ++NumMovedLoads;
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else if (isa<CallInst>(I)) ++NumMovedCalls;
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