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From: robison@uiucdcsb.cs.uiuc.edu
Newsgroups: comp.arch
Subject: Re: An idea I'm kicking around
Message-ID: <165100006@uiucdcsb>
Date: Sun, 19-Apr-87 19:13:00 EST
Article-I.D.: uiucdcsb.165100006
Posted: Sun Apr 19 19:13:00 1987
Date-Received: Tue, 21-Apr-87 01:24:02 EST
References: <137@auvax.UUCP>
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Nf-From: uiucdcsb.cs.uiuc.edu!robison    Apr 19 18:13:00 1987


In article <12884@watnot.UUCP>, ccplumb@watnot.UUCP writes:
>   I've been dreaming up A RISCy architecture in my spare time, and [...]
> I ran into the problem of handling JSR's.
> [ ... ]
> What if JSR moved the return address into another register?
> 	-Colin Plumb (watmath!watnot!ccplumb)

The PC/RT processor chip stores the return address in a register.  This 
method is quite simple, since upon entry to most subroutines, the processor
saves a block of registers on the stack anyway.  In the case of a leaf 
procedure (a procedure with no embedded procedure calls), the processor
can avoid the save.

Arch D. Robison
University of Illinois at Urbana-Champaign
	
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