Re: No Aliasing Compile Option

larus@primost.cs.wisc.edu (James Larus)
29 May 90 13:55:27 GMT

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Re: No Aliasing Compile Option markro@microsoft.UUCP (1990-05-25)
Re: No Aliasing Compile Option larus@primost.cs.wisc.edu (1990-05-29)
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From: larus@primost.cs.wisc.edu (James Larus)
Newsgroups: comp.compilers
Keywords: aliases, optimizing compilers, C
Date: 29 May 90 13:55:27 GMT
References: <54866@microsoft.UUCP> <4886@daffy.cs.wisc.edu> <26547195.F69@tct.uucp> <1990May19.141401.4350@ux1.cso.uiuc.edu> <265861D7.3293@tct.uucp> <1913@cod.NOSC.MIL>
Organization: University of Wisconsin--Madison

Let me stick in a plug for some work that I've done recently. Univ. of
Wisconsin Computer Science Tech Report #929** contains some measurements of
6 C programs (including gcc). The measurements were done to estimate the
potential parallelism of the programs, but as a side-effect, I measured the
number and type of loop-carried data dependences in the program. These
dependences are very frequent and give an indication of the consequences of
blindly ignoring aliases and heavily optimizing a program.


/Jim


** Copies available from Kathy Schultz (kathy@cs.wisc.edu) or


Technical Reports Librarian
Computer Sciences Department
University of Wisconsin
1210 W. Dayton St.
Madison, WI 53706




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