Re: Conditional Execution (was Re: % in hash table)

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Article #12639

#12639

From: D. J. Bernstein
Date: Sat, 14 Oct 1995 23:44

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Holger Petersen <hp@kbbs.org> wrote:
> Which one's have "Decrement Jump Non zero" (Z80,8051, 80x86 have)

Note that, on the 80386, 80486, and Pentium, this instruction (LOOP) is
slower than the obvious DEC/JNZ. See Abrash's _Zen of Code Optimization_
for more details.

---Dan

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Message-ID: <1995Oct1423.44.03.13389@silverton.berkeley.edu>

Path: arc1-ca.pugleaf.net!silverton.berkeley.edu!djb

References: <43tqr6$3au@mikasa.iol.it> <DGCFt9.GH7@world.std.com> <45lb6c$jeb@doc.armltd.co.uk> <1995Oct14.192120.10218@kbbs.org>

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Path: arc1-ca.pugleaf.net!silverton.berkeley.edu!djb
From: djb@silverton.berkeley.edu (D. J. Bernstein)
Message-ID: <1995Oct1423.44.03.13389@silverton.berkeley.edu>
Date: 14 Oct 1995 23:44:03 GMT
Newsgroups: comp.arch,comp.arch.arithmetic,comp.lang.c
Subject: Re: Conditional Execution (was Re: % in hash table)
References: <43tqr6$3au@mikasa.iol.it> <DGCFt9.GH7@world.std.com> <45lb6c$jeb@doc.armltd.co.uk> <1995Oct14.192120.10218@kbbs.org>
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