Re: importing code in IR (GIMPLE and/or RTL)

[Jim Wilson <wilson at specifixinc dot com>]

Luchezar Belev wrote:
> Won't it be possible the order of the optimizing passes not to be hardcoded,
> but to be controlled by a config file or something.

This isn't practical for RTL optimization passes, for various reasons. 
The RTL is only a partial representation of a function.  Much of the 
info is in various global variables which are only created or maintained 
in certain optimization passes.  Some of the info is RTL annotatations 
that are only created or maintained in certain optimization passes. 
Most passes make assumptions that certain optimizations have or have not 
been performed yet.  The result is that usually the location of an RTL 
pass is fairly limited.  There have been some improvements in this area, 
trying to improve infrastructure so we can recalculate info when we need 
it, or maintain it until we use it, but this problem may never be 
completely fixed.

I can't speak for the new gimple optimization passes, but hopefully they 
are better designed, and have fewer ordering constraints.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com