From: "H.Yamamoto" <ocean@...2.ccsnet.ne.jp>
Date: 2005-02-09T11:40:25+09:00
Subject: Re: math changes from 1.8.1 to 1.8.2?(G4's fault?)

Hello.

ptkwt@aracnet.com (Phil Tomson) wrote:
(2005/02/08 19:00)

>>fp = FixedPt.new(Math.exp(-5),18,18)
>>
>>Which defines an 18bit register with the binary point at bit 18 and stuffs 
>>the result of Math.exp(-5) into it (shifting the result to the left 18 
>>times).
>>
>>fp.to_f #=> 0.00673675537109375
>>fp.raw  #=> 1766  
>>fp.to_i #=> 0

>I loaded up 1.8.2 on my powerbook last night and had the same problem 
>(which doesn't exist on the Pentium IV).  I suspect it's a difference in 
>the FPU between the G4 and PIV.  I'm doing lots of summations and 
>conversions between floating point and fixed point, so I suspect it's the 
>fault of the G4's FPU..... unless someone else has any other theories.

Interesting. Can I see the code of FixedPt?