Re: detecting constants at runtime

"Gene" <gene.ressler@gmail.com>
21 Nov 2005 22:43:59 -0500

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Related articles
detecting constants at runtime kamath.poornima@gmail.com (kamath.poornima@gmail.com) (2005-11-19)
Re: detecting constants at runtime gene.ressler@gmail.com (Gene) (2005-11-21)
Re: detecting constants at runtime gene.ressler@gmail.com (Gene) (2005-11-21)
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From: "Gene" <gene.ressler@gmail.com>
Newsgroups: comp.compilers
Date: 21 Nov 2005 22:43:59 -0500
Organization: http://groups.google.com
References: 05-11-090
Keywords: optimize

Certainly you can translate assembly instructions to basic blocks of
tuples and do constant detection and folding with the same algorithms
a compiler would use. You'll only detect new constants if your
constant folding algorithm is better than the original compiler's.


I believe profiling is irrelevant for constant detection because
determining in all cases whether a quantity is constant at run time is
an undecidable problem. The best you can do is "estimate" what's
constant from static program structure.


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