Re: 1364 issue 140 and negative exponents

From: Dennis Marsa (drm@xilinx.com)
Date: Mon May 05 2003 - 14:44:07 PDT

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    Kurt Baty wrote:
    >
    > > Then I'm confused. If the rounding was "away from zero",
    > > then wouldn't all of the combinations whose real result
    > > is in the range (0.0,1.0) round to an integer result of 1,
    > > and likewise results in the range (-1.0,0.0) would round to
    > > a integer result of -1? Your test program results don't
    > > indicate this.
    >
    > some functions:
    >
    > truncate -> real result in the range (0.0 <= fract < 1.0)
    > goes to 0
    > ceiling -> real result in the range (0.0 < fract <= 1.0)
    > goes to 1
    > round -> real result in the range (0.0 < fract < 0.50)
    > goes to 0
    > real result in the range (0.5 < fract <= 1.0)
    > goes to 1
    > real result is exactly (fract = 0.5)
    > case(rounding mode)
    > up: goes to 1 (round "away from zero")
    > down: goes to 0 (round "towards zero")
    > nearest: if(low bit of abs(integer) part is:
    > zero: goes to 0
    > one: goes to 1
    >
    > does this help?

    Yes. I see what round away from zero really means now. Thanks.

    Dennis

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