Can 750 user-mode binaries run on a 603e core?

[Patrick J. Kelsey]

(sorry about that last one. had a bit of trouble with a certain web based mail client...) 
 
Thanks for the reply, Kumar.
 
That sounds encouraging.  One of the things I was worried about with scheduling differences would be a differing number of branch delay slots between the two core versions.  I'm still a bit new to the details of the PowerPC architecture, and at this point I'm not even sure if there are branch delay slots, although it does seem from my reading that the 603e and 750 pipelines are the same, in which case there would ceratinly be no worries here.
 
At this point, I'm not concerned so much about an inefficient schedule resulting from running -mcpu=750 code on a 603e as long as the execution is correct.
 
Pat
 

	-----Original Message----- 
	From: linuxppc-dev-bounces+kelseypj=fairmountautomation.com at ozlabs.org on behalf of Kumar Gala 
	Sent: Wed 7/26/2006 8:04 PM 
	To: Patrick J. Kelsey 
	Cc: linuxppc-dev at ozlabs.org 
	Subject: Re: Can 750 user-mode binaries run on a 603e core?
	
	


	On Jul 26, 2006, at 5:27 PM, Patrick J. Kelsey wrote:
	
	> Hi,
	>
	> If have user-mode binaries built for a 750 core, say with gcc -
	> mcpu=750, should I expect them to run on a 603e core?  Would I have 
	> to worry about unsupported instructions or instruction scheduling 
	> issues?
	>
	> If there's a better list for this question, please advise.
	
	Sure, there isn't different in the user space instruction sets 
	between the 750 and 603e core.  The -mcpu is only tweaking 
	instruction scheduling and making it specific for the 750.  The 
	instruction scheduling differences aren't that huge if memory serves 
	me correctly.  The 750 probably takes fewer cycles on multiple and 
	divides.  I forget if the 750 has any additional execution units that 
	the 603e didn't have (additional integer units, etc.).
	
	- kumar
	_______________________________________________
	Linuxppc-dev mailing list
	Linuxppc-dev at ozlabs.org
	https://ozlabs.org/mailman/listinfo/linuxppc-dev