Re: 1364 issue 140 and negative exponents

From: Dennis Marsa (drm@xilinx.com)
Date: Mon May 05 2003 - 12:11:00 PDT

  • Next message: Kurt Baty: "Re: 1364 issue 140 and negative exponents"

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    Kurt Baty wrote:
    >
    > Precedence: bulk
    >
    > > From drm@xilinx.com Mon May 5 13:41:55 2003
    > >
    > > > 2 ** -1 = 1 = 0.5
    > > > -2 ** -1 = -1 = -0.5
    > >
    >
    > please note that:
    >
    > initial
    > begin
    > x_real = 0.5;
    > x = x_real;
    > $display("x = %0d = x_real =",x,x_real);
    > $display;
    > for(y=limit;y>=-limit;y=y-1) begin
    >
    > displays:
    >
    > Highest level modules:
    > ieee_etf_140_test
    >
    > x = 1 = x_real =0.5

    I am not sure what you are trying to convey with that
    first $display statement before the main loop in your
    test program.

    Are you trying to show that reals are being rounded
    to nearest as opposed to being rounded towards zero?

    I had figured the results

      2 ** -1 = 1
     -2 ** -1 = -1

    were a result of rounding to nearest.

    But, my specific question is, are these the results you are
    advocating for these particular operands?

    From James' email today and from the discussion this morning, I had
    thought the desired results would be:

      2 ** -1 = 0
     -2 ** -1 = 0

    Dennis

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