[llvm-commits] [llvm] r118803 - /llvm/trunk/lib/CodeGen/MachineLICM.cpp

[Dan Gohman]

Author: djg
Date: Thu Nov 11 12:08:43 2010
New Revision: 118803

URL: http://llvm.org/viewvc/llvm-project?rev=118803&view=rev
Log:
Add a FIXME comment.

Modified:
    llvm/trunk/lib/CodeGen/MachineLICM.cpp

Modified: llvm/trunk/lib/CodeGen/MachineLICM.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineLICM.cpp?rev=118803&r1=118802&r2=118803&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineLICM.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineLICM.cpp Thu Nov 11 12:08:43 2010
@@ -944,6 +944,8 @@
     // 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);