Re: query regarding ivopts.

[Ramana Radhakrishnan <ramana dot radhakrishnan at celunite dot com>]

Hi Zdenek, 

I can't seem to reproduce this on 4.1.x with any other port. Maybe I need a sync
up with the latest svn of 4.1.x . I'll try looking at 4.2 head also to spot
differences if any. 

Thanks for your time

cheers
Ramana

Ramana Radhakrishnan
GNU Tools
Celunite Inc

On Wed Jul 19  8:09 , Zdenek Dvorak  sent:

>Hello,
>
>> I am upgrading a port from 3.4.5 to 4.1.x .In course of this I see some
>> regressions in terms of performance in memcpy . I have narrowed down the test
>> case to the function below.
>> 
>> ivopts generates ivtmps for each of the address calculations as shown in the
>> attached log instead of coalescing them into accesses off a single base . 
>> 
>> I have constant offset based indexed addressing available. 3.4.x works just fine
>> and transforms these into accesses off a single base. 
>> 
>> >From the little I understand of the way ivopts works- I assume this has to do
>> with costs from my backend. I tweaked TARGET_ADDRESS_COST to return 0 always as
>> well as specifically for POST_INC, POST_DEC and friends , but this did not help . 
>> 
>> Any suggestions would be great ! Thanks for your time . 
>
>this is a bug in ivopts, the costs have nothing to do with it.  It
>appears to be fixed in 4.2 (I cannot reproduce it with your example
>there).
>
>Zdenek
>