Article View: comp.arch
Article #11837Re: The MIPS EXECUTE instruction
From: Cliff Herod
Date: Tue, 28 May 1991 18:26
Date: Tue, 28 May 1991 18:26
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In article <1991May27.184311.11596@zeno.mn.org> gene@zeno.mn.org (Gene H. Olson) writes:
>Looking through all the documentation I have been able to find
>on the MIPS processor (Including Gerry Kane's book) I haven't
>found a rule about putting a branch in a branch delay slot.
>
Actually, the MIPS R-series Architecture document says:
2.7. Jump and Branch Instructions (may be number differently in other eds.)
All jump and branch instructions are implemented with a delay of exactly
one instruction. That is, the instruction immediately following a jump
or branch (i.e. occupying the "delay slot") is always executed while the
target instruction is being fetched from storage. It is not valid for
a delay slot to be occupied itself by a jump or branch instruction;
however this error is not detected, and the results of such an operation
are undefined.
>
>So, you MIPS software development guys, how about you put it
>in the assembler?
What happens to your trick when the R4000 comes along with three delay slots?
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!spool.mu.edu!uunet!convex!herod From: herod@convex.com (Cliff Herod) Newsgroups: comp.arch,comp.sys.mips,comp.sys.dec Subject: Re: The MIPS EXECUTE instruction Message-ID: <1991May28.182625.15199@convex.com> Date: 28 May 91 18:26:25 GMT Article-I.D.: convex.1991May28.182625.15199 References: <1991May27.184311.11596@zeno.mn.org> Sender: usenet@convex.com (news access account) Organization: CONVEX Computer Corporation, Richardson, Tx., USA Lines: 22 Nntp-Posting-Host: orion.convex.com