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bug#15320: [2.0.7] Rational number representation problem

From: Mark H Weaver
Subject: bug#15320: [2.0.7] Rational number representation problem
Date: Thu, 12 Sep 2013 17:03:34 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Josh Stokes <address@hidden> writes:

> It seems that certain small numbers are represented as integers, as (*
> 4294967296 4294967296) results in 0, but (* 3294967296 3294967296)
> returns the correct value of 10856809481709551616. In addition, (ash 1
> 64) gives 0, but (ash 1 65) works correctly.

This is fixed in Guile 2.0.9.

In case you're curious: this bug came into existence when C compilers
started optimizing out overflow checks, on the theory that if a signed
integer overflow occurs then the behavior is unspecified and thus the
compiler can do whatever it likes.



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