[llvm-dev] Loop Distribution pass

[Jonas Paulsson via llvm-dev]

Hi,

I found with the help of the optimization remarks a loop that could not 
be vectorized, but if loop distribution was enabled this may happen, 
which it in fact did with a very significant benchmark improvement (~25%).

I tried (on SystemZ) to enable this pass, and found that it only 
affected a handful of files on SPEC. This means I could enable this 
without worrying about any regressions on SystemZ at least currently.

I wonder if there is something more to know about this. It seems that no 
other target has enabled this due to general mixed results, or? Is this 
triggering much more on other targets, and if so, why?

/Jonas