http:^^www.cs.wisc.edu^~larus^spim.html

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Date: Tue, 05 Nov 1996 20:44:01 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Fri, 02 Feb 1996 17:24:55 GMTContent-length: 2840<html><head><title> SPIM </title><!-- Changed by: James Larus,  2-Feb-1996 --></head><body><h1> SPIM </h1><p>The SPIM S20 is a software simulator that runs assembly languageprograms for the MIPS R2000/R3000 RISC computers.  SPIM can read andimmediately run files containing assembly language statements.  It canalso read and run MIPS a.out files (when compiled on a MIPS system).SPIM is a self-contained system for running these programs andcontains a debugger and interface to the operating system.<p>To see the manual, click <!WA0><!WA0><A HREF="http://www.cs.wisc.edu/~larus/SPIM_manual/spim-manual.html">here</A><p>I wrote SPIM as the target machine for an undergraduate compilercourse. SPIM is very portable (I have run it on a DECStation3100/5100, Sun 3, Sun 4, PC/RT, HP Bobcat, and Sequent***), so thestudents could generate code for a simple, clean, orthogonal computer;no matter which god-awful machine they used.  It was a very successfulin this role.<p>****NEW NEWS****<br>The Macintosh and PC versions of SPIM are available by anonymous ftp from:ftp.cs.wisc.edu:pub/spim<br>****************<p>SPIM is fairly slow.  It runs about 1000 dhrystones/second, which isroughly 1/25th the speed of a DECStation 3100, or about the speed of a68010-based system.<p>SPIM implements almost the entire MIPS assembler-extended instructionset (I've omitted some the complex floating point comparisons anddetails of the memory system page tables).  SPIM comes with completesource code and documentation of all instructions (including severalthat aren't in Kane's book, but are produced by MIPS compilers).  Italso include a large torture test to verify a port to a new machine.<p>SPIM has a simple, terminal-style and a flashy, X-windows interface.<p>SPIM also includes an optional extension by Anne Rogers and ScottRosenberg of Princeton that performs a cycle-by-cycle MIPS simulationthat exposes the hardware pipeline.<p>SPIM is copyrighted by me and can be freely used for non-commercialpurposes.  You can copy a compressed tar file from ftp.cs.wisc.edu inthe file:<!WA1><!WA1><a href="ftp://ftp.cs.wisc.edu/pub/spim/spim.tar.Z">~ftp/pub/spim/spim.tar.Z</a>.If you want to be informed of future updates, send me your electronic address.<p>SPIM comes with documentation, however Appendix A of Hennessy &Patterson, "Computer Organization and Design: The Hardware/SoftwareInterface," Morgan Kaufman, 1993 is a far better introduction to thesoftware.<p><!WA2><!WA2><a href="http://www.cs.wisc.edu/~larus/larus.html">James Larus</a><br>Computer Sciences Department <br>1210 West Dayton Street <br>University of Wisconsin <br>Madison, WI 53706 <br><p>larus@cs.wisc.edu(608) 262-9519<p>*** SPIM also runs on a VAX, however it does not handle floating pointproperly because compilers for the VAX do not treat single floatsproperly.</body></html>

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