Re: Unsafe Optimizations (formerly Compiler Design in C...)

In article <1990Jun15.051349.3016@esegue.segue.boston.ma.us>, pardo@june.cs.washington.edu (David Keppel) writes:


> while (*d++ = *s++)
> ; /* VOID */


> while (d[i] = s[i])
> ++i;


I interviewed at Convex Computers once, and during my coding test they
asked me what approach I would take to optimize my code. I mentioned
converting array references to pointers, and everyone laughed. Their
vectorizing code generator was able to vectorize array references,
but there wasn't much they could do with pointers. I thought it
was interesting that one computer's optimization was another computer's
de-optimization.
--
Mark Harrison harrison@necssd.NEC.COM
(214)518-5050 {necntc, cs.utexas.edu}!necssd!harrison
standard disclaimers apply...


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