Re: Which optimization levels affect gimple?

[Diego Novillo <dnovillo at redhat dot com>]

Paulo J. Matos wrote on 01/24/07 12:44:

> check what kind of gimple code you get with -fdump-tree-gimple and
> -O0 and -O3 have different results,
-fdump-tree-gimple is the first dump *before* any optimizations occur.
To see the effect of all the GIMPLE optimizations you should use
-fdump-tree-optimized.

> however, -O3 and -O9 have exactly the same output. Will -Ox for x >
> 3, generate the same gimple trees? (i.e., are done in backend of
> gcc?)
-On for n >= 3 is identical to -O3.  This may change in the future.