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R6RS fixnum arithmetic optimizations

From: Andreas Rottmann
Subject: R6RS fixnum arithmetic optimizations
Date: Sat, 2 Apr 2011 19:42:25 +0200

After getting no feedback on my last mail so far, here is a series of
proposed patches for the stable-2.0 branch.  In total, they speed up the
unzip benchmark by a factor of about 4.7, but it's still about 1.8 times
slower than what we'd get for using generic (non-fixnum) operations.

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