CSE removing a load that is necessary

Pranav Bhandarkar pranav.bhandarkar@gmail.com
Mon Jul 30 10:37:00 GMT 2007


Hi,

>   Or perhaps this could be another manifestation of the "cse gets confused by
> reg_equal notes on subparts of dimode pseudos if no movdi pattern is defined
> in the backend" bug[*]?  Pranav, is there a movdi pattern in your backend?
> There needs to be one, gcc does get it wrong if you rely on it to break
> everything down to si-sized movs.

Yes, It looks like a similar problem, but there seems to be no
consensus on a correct solution to this problem. I couldnt find the
bug number but  this thread describes the exact same problem ( but
with REG_EQUIV notes).

http://gcc.gnu.org/ml/gcc/2001-02/msg01372.html


Thanks,
Pranav



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