[llvm-commits] [llvm] r50382 - in /llvm/trunk: include/llvm/LinkAllPasses.h include/llvm/Transforms/Scalar.h lib/Transforms/Scalar/DeadLoopElimination.cpp

[Owen Anderson]

On Apr 29, 2008, at 1:36 PM, Chris Lattner wrote:
>> +bool DeadLoopElimination::IsLoopInvariantInst(Instruction *I, Loop*
>> L)  {
>
> Can Loop::isLoopInvariant be used for this?

Unfortunately, no.  isLoopInvariant never considers an instruction  
defined within the loop to be invariant.  I tried using it initially,  
and found that i eliminated very few loops.  The code I'm using here  
is the same logic that LICM uses as well.

--Owen
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