This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]

Re: df.c and partial writes/REG_EQUAL notes


Jan Hubicka <jh@suse.cz> writes:

>>   In message <20010925161602.C13734@atrey.karlin.mff.cuni.cz>you write:
>>   > yesterday I wanted to make myself familiar with the dataflow module and
>>   > write simple code to construct webs early and split each pseudo consisting
>>   > of multiple webs to assist CSE and other optimizations.
>> Don't bother.  SSA will do this for you in a much more sane way and will
>> probably be faster and generate better code anyway.
> 
> Hmm, I understand that you may get the renaming of pseudos as side effect
> of SSA/deSSA converison, but why it will be faster/generate better
> code?
It won't be, assuming you are using my patches to df.c to change the
iteration order/etc.
It'll be O(n+2).

-- 
"I play the harmonica.  The only way I can play is if I get my
car going really fast, and stick it out the window.  I've been
arrested three times for practicing.
"-Steven Wright


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]