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Add a FIXME comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118803 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-11-11 18:08:43 +00:00
parent c466b937db
commit fca0b106f7
1 changed files with 2 additions and 0 deletions
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lib/CodeGen/MachineLICM.cpp
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@ -944,6 +944,8 @@ bool MachineLICM::IsProfitableToHoist(MachineInstr &MI) {
// In low register pressure situation, we can be more aggressive about
// hoisting. Also, favors hoisting long latency instructions even in
// moderately high pressure situation.
// FIXME: If there are long latency loop-invariant instructions inside the
// loop at this point, why didn't the optimizer's LICM hoist them?
DenseMap<unsigned, int> Cost;
for (unsigned i = 0, e = MI.getDesc().getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI.getOperand(i);