Re: errata/140 and errata/192: real values vs integer values

From: Kurt Baty (kurt@wsfdb.wsfdb.com)
Date: Tue May 13 2003 - 06:26:18 PDT

  • Next message: Shalom Bresticker: "Re: errata/140 and errata/192: real values vs integer values"

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    > From Shalom.Bresticker@motorola.com Tue May 13 08:09:55 2003

    > I ran this in VCS. Results attached.

    some quick editing of the log files shows that
    the results are all in agreement for an integer "/"
    with trucation.

    should the integer results of "**" be as if
    the last step (in the negetive exponent cases)
    was an integer "/" with trucation?

    so that 2 ** -1 = 0 not 1?

            kurt

    wsfdb% diff vxl_results vcs_results
    1c1
    < VERILOG-XL 4.00.s003 log file created May 13, 2003 07:19:19 

    ---
> Compiler version 6.2R10; Runtime version 6.2R10;  May 13 16:13 2003
14c14
< 4 / 3 as int = 1 as real = 1 = 1.333333333333333
---
> 4 / 3 as int = 1 as real = 1 = 1.33333
16,17c16,17
< 2 / 3 as int = 0 as real = 1 = 0.6666666666666666
< 1 / 3 as int = 0 as real = 0 = 0.3333333333333333
---
> 2 / 3 as int = 0 as real = 1 = 0.666667
> 1 / 3 as int = 0 as real = 0 = 0.333333
19,20c19,20
< -1 / 3 as int = 0 as real = 0 = -0.3333333333333333
< -2 / 3 as int = 0 as real = -1 = -0.6666666666666666
---
> -1 / 3 as int = 0 as real = 0 = -0.333333
> -2 / 3 as int = 0 as real = -1 = -0.666667
22c22
< -4 / 3 as int = -1 as real = -1 = -1.333333333333333
---
> -4 / 3 as int = -1 as real = -1 = -1.33333
41,44c41,44
< 4 / 0 as int = x as real = 0 = Infinity
< 3 / 0 as int = x as real = 0 = Infinity
< 2 / 0 as int = x as real = 0 = Infinity
< 1 / 0 as int = x as real = 0 = Infinity
---
> 4 / 0 as int = x as real = 0 = Inf
> 3 / 0 as int = x as real = 0 = Inf
> 2 / 0 as int = x as real = 0 = Inf
> 1 / 0 as int = x as real = 0 = Inf
46,49c46,49
< -1 / 0 as int = x as real = 0 = -Infinity
< -2 / 0 as int = x as real = 0 = -Infinity
< -3 / 0 as int = x as real = 0 = -Infinity
< -4 / 0 as int = x as real = 0 = -Infinity
---
> -1 / 0 as int = x as real = 0 = -Inf
> -2 / 0 as int = x as real = 0 = -Inf
> -3 / 0 as int = x as real = 0 = -Inf
> -4 / 0 as int = x as real = 0 = -Inf
68c68
< 4 / -3 as int = -1 as real = -1 = -1.333333333333333
---
> 4 / -3 as int = -1 as real = -1 = -1.33333
70,71c70,71
< 2 / -3 as int = 0 as real = -1 = -0.6666666666666666
< 1 / -3 as int = 0 as real = 0 = -0.3333333333333333
---
> 2 / -3 as int = 0 as real = -1 = -0.666667
> 1 / -3 as int = 0 as real = 0 = -0.333333
73,74c73,74
< -1 / -3 as int = 0 as real = 0 = 0.3333333333333333
< -2 / -3 as int = 0 as real = 1 = 0.6666666666666666
---
> -1 / -3 as int = 0 as real = 0 = 0.333333
> -2 / -3 as int = 0 as real = 1 = 0.666667
76c76
< -4 / -3 as int = 1 as real = 1 = 1.333333333333333
---
> -4 / -3 as int = 1 as real = 1 = 1.33333
86c86
< End of VERILOG-XL 4.00.s003   May 13, 2003  07:19:21
---
>            V C S   S i m u l a t i o n   R e p o r t 
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