[llvm-dev] optimization remarks

[Jonas Paulsson via llvm-dev]

Hi,

I am trying to compare the loop vectorizers effectiveness for different 
targets relative to each other. That way, I am hoping to find loops that 
are not vectorized - but could be - on my target by finding other 
targets doing this successfully. With some luck, there might be 
something in the Target files that could be fixed with improved 
vectorization as a result...

I would like to do this with the optimization remarks enabled: 
-Rpass=loop-vectorize, etc. Since cross-compiling benchmarks seems 
tricky to me at the moment, my idea was to first run the front end, and 
then run the optimizers for different targets. However, when I pass 
-save-temps to clang there are no remarks emitted at all any more... So 
in effect I can only get the remarks for the target I am on :-/

I wonder if there is a reason for this, or if it's something that could 
be fixed?

/Jonas