[LLVMdev] Unnatural loops with O0

[Chris Lattner]

On Feb 11, 2009, at 1:13 PM, Marc de Kruijf wrote:

> I am reviving this thread because I am seeing the same thing  
> (unnatural loops produced by llvm-gcc), but it is not limited to -O0  
> -- I am seeing it for -O2 and -O3 as well.
> Some of my research work is relying on LoopInfo to provide loop  
> information for all loops, but it is missing these loops.  Is there  
> any work in the pipeline that aims to fix this?

Not that I know of.  There has been a project on the open projects  
list to write a pass that converts all loops to natural loops (through  
code duplication).  That would be a nice and self-contained project if  
anyone is interested.

-Chris