Article View: comp.arch
Article #10383Re: Compilers and efficiency
From: Shankar Unni
Date: Sat, 20 Apr 1991 04:43
Date: Sat, 20 Apr 1991 04:43
18 lines
1428 bytes
1428 bytes
In comp.arch, robertsw@gtephx.UUCP (Wild Rider) writes:
> or, you could do like motorola did when they designed the 030:
> dump a couple of unused 020 instructions, i.e., the "callm"
> ("call module") and the corresponding "rtm" ("return from
> module") instructions. yes, that's correct, you can have an
That's surely an oversimplification. What usually happens is that those
instructions will raise some sort of "unimplemented instruction" (or
so-called "assist") exception, which is different from the run-of-the-mill
"illegal instruction", moving the responsibility for simulating
those instructions to the kernel (or the user program, if you are running
stand-alone embedded programs). This sort of thing is commonly done with
certain types of floating-point instructions.
-----
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpda!hpcuhc!hpcupt3!shankar From: shankar@hpcupt3.cup.hp.com (Shankar Unni) Newsgroups: comp.arch Subject: Re: Compilers and efficiency Message-ID: <45760011@hpcupt3.cup.hp.com> Date: 20 Apr 91 04:43:22 GMT References: <9782@mentor.cc.purdue.edu> Organization: HP India Software Op., Bangalore Lines: 18