[llvm-dev] LoopStrengthReduce.cpp

[Jonas Paulsson via llvm-dev]

> On that note, I think that in general it would be useful to have some 
> target-independent (CodeGen) pass that would do the majority of the 
> work for hardware loop generation.  I have thought about it, but I 
> won't be able to do anything in the short term.
>
> -Krzysztof
>
I think a first and useful step would be to let targets optionally have 
the loop induction variable which controls the back-branching be 
reformulated as a decrement towards zero with a -1 step. Should this be 
an extension of LSR, or should it be a simple beginning of a HW-loop 
pass running after it?

/Jonas