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Subject: Re: [boost] [review][constrained_value] Review of Constrained Value Library begins today
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-12-11 10:56:43


Johan RÃ¥de wrote:
> Imagine the following case,
> 1) x and y are stored in 80-bit registers
> 2) x < y
> 3) both x and y are just below 1.0,
> so close that they would be rounded to 1.0 if truncated to 64 bits
> If now x is truncated to 64 bits, and then moved back to an 80-bit
> register,
> while y is unchanged, then x > y.

In other words, we always have to force at least one of x and y to
be truncated in order to have any guarantee. If we can do that we might as
well force both values to be truncated, right. I think that so far
in this discussion is has been assumed that the bounds are truncated.

In Christ,
Steven Watanabe

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