[llvm-commits] [llvm] r50406 - /llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp

[Devang Patel]

Thanks!
On Apr 28, 2008, at 11:34 PM, Owen Anderson wrote:

> Author: resistor
> Date: Tue Apr 29 01:34:55 2008
> New Revision: 50406
>
> URL: http://llvm.org/viewvc/llvm-project?rev=50406&view=rev
> Log:
> Clarify what we mean by a dead loop.
>
> Modified:
>    llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp
>
> Modified: llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp?rev=50406&r1=50405&r2=50406&view=diff
>
> =
> =
> =
> =
> =
> =
> =
> =
> ======================================================================
> --- llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp  
> (original)
> +++ llvm/trunk/lib/Transforms/Scalar/DeadLoopElimination.cpp Tue Apr  
> 29 01:34:55 2008
> @@ -126,6 +126,10 @@
>   return true;
> }
>
> +/// runOnLoop - Remove dead loops, by which we mean loops that do  
> not impact the
> +/// observable behavior of the program other than finite running  
> time.  Note
> +/// we do ensure that this never remove a loop that might be  
> infinite, as doing
> +/// so could change the halting/non-halting nature of a program.
> bool DeadLoopElimination::runOnLoop(Loop* L, LPPassManager& LPM) {
>   // Don't remove loops for which we can't solve the trip count.
>   // They could be infinite, in which case we'd be changing program  
> behavior.
>
>
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-
Devang