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Don't hoist instructions that have implicit uses or defines. Before, it was
hoisting out some "test" and "cmp" instructions. This was obvious badness. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54908 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -264,6 +264,11 @@ bool MachineLICM::IsLoopInvariantInst(MachineInstr &I) {
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}
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});
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if (I.getDesc().getImplicitDefs() || I.getDesc().getImplicitUses()) {
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DOUT << "Cannot hoist with implicit defines or uses\n";
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return false;
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}
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// The instruction is loop invariant if all of its operands are.
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for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = I.getOperand(i);
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