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From: toma@tekgvs.TEK.COM (Tom Almy)
Newsgroups: comp.arch,comp.lang.forth
Subject: Re: Stack Computer References
Keywords: stack
Message-ID: <2977@tekgvs.TEK.COM>
Date: 18 Dec 87 15:20:58 GMT
References: <503@PT.CS.CMU.EDU> <595@wolf.UUCP>
Reply-To: toma@tekgvs.UUCP (Tom Almy)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 14


I thought I'd mention the 8087 family.  Even though it is just a coprocessor,
it does stack operations (register-register operations with difficulty).
For instance, when the 8087 stack is used as the stack for floating
point operations, F@ F! F+ F- F* F/ FABS FDROP FDUP FSWAP and FOVER can
all be done a single instruction (plus interpreter overhead, if any, no
overhead if the Forth code is compiled).  FROT FIX and FLOAT take two or
three instructions.  Most operation have non-destructive modes as well,
so that operations such as FDUP F! can be performed as a single instruction
as well.

Tom Almy
toma@tekgvs.TEK.COM
!tektronix!tekgvs!toma