Article View: comp.arch
Article #10265RE: Bitfield and loop instructions--a good idea?
From: cs450a03
Date: Mon, 15 Apr 1991 22:40
Date: Mon, 15 Apr 1991 22:40
17 lines
1268 bytes
1268 bytes
Zalman Stern writes: > rrib Takes bit 0 of source register, rotates it by an amount in > a register and inserts it into the destination register. > (I'm not sure what this is used for.) That's for setting up bit arrays where you're applying some predicate to a large quantity of data. >All in all this stuff is neat and adds character to the architecture. >However, I'm not sure it is the best way to do things. Some codes >will perform better due to the bit manipulation instructions, but I >doubt they show up very often at all. They don't in programs written in C. C has no support for generic bit crunching. (The same goes for FORTRAN, and so on...) Raul Rockwell
Technical Details
Message-ID:
<15APR91.22405995@uc780.umd.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!sample.eng.ohio-state.edu!purdue!haven!ni.umd.edu!uc780.umd.edu!cs450a03References:
<1991Apr15.193425.3436@waikato.ac.nz> <2302@spim.mips.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!sample.eng.ohio-state.edu!purdue!haven!ni.umd.edu!uc780.umd.edu!cs450a03 From: cs450a03@uc780.umd.edu Newsgroups: comp.arch Subject: RE: Bitfield and loop instructions--a good idea? Message-ID: <15APR91.22405995@uc780.umd.edu> Date: 15 Apr 91 22:40:59 GMT References: <1991Apr15.193425.3436@waikato.ac.nz> <2302@spim.mips.COM> Sender: usenet@ni.umd.edu (USENET News System) Organization: The University of Maryland University College Lines: 17