RE: Superoptimiser for Hitachi H8/300H

["Shrinivas Atre" <ShrinivasA at kpit dot com>]

Hi Toshi,

Default integer size is 16 bit for H8 compiler in GCC. This H8/300H port of SuperOpt supports only 16 bit integers. Hence I have taken shifts only upto 16 bits. 

Enabling the use of extended registers is in our TODO list. Please see the TODO file shipped with the SuperOpt. 

> This comment "only 16 bit operations supported by H8/300H" is 
> incorrect.

I meant to say that this port of SuperOpt for H8/300H is using only 16 bit registers.
I will update the comments accordingly. 

Regards,
Shrinivas

> -----Original Message-----
> From: tm [mailto:tm@mail.kloo.net]
> Sent: 13 November 2002 02:25 AM
> To: Shrinivas Atre
> Cc: gcc@gcc.gnu.org; shumpei.kawasaki@hsa.hitachi.com
> Subject: Re: Superoptimiser for Hitachi H8/300H
> 
> 
> 
> Shrinivas Atre wrote:
> 
> >Hi,
> >based upon Superoptimiser 2.5 available at
> >http://www.ensta.fr/internet/unix/programming/GNU-superoptimi
> zer.html, I
> >have added Hitachi H8/300H as one of the target to this 
> project. The file
> >superopt-2.6.tar.gz is attached with this mail.
> 
> >The assembly instruction sequences generated by H8/300H port 
> along with
> >the testsuite are available in the attached file 
> h8-testsuite.tar.gz. 
> 
> >Suggestions and/or comments on this are most welcome.
> 
> >Regards,
> >Shrinivas
> 
> You have the shifts > 16 conditionally compiled:
> 
> #ifndef H8300H
> 
> /* Only 16 bit operations supported by H8/300H */
> 
> ...
> 
> #endif // H8300H
> 
> This comment "only 16 bit operations supported by H8/300H" is 
> incorrect.
> 
> The H8/300H has 32-bit registers, and if code is compiled 
> with -mint32 -mh
> the integers become 32-bits and use a full 32-bit register.
> 
> It's the H8/300 which has only 16-bit registers.
> 
> Toshi
> 
>