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  • Start Location Bug

    From John Metcalf@21:1/5 to All on Tue Aug 2 18:23:54 2022
    Hi,

    A couple of months ago I noticed strange behaviour from a warrior.
    Moving the boot pointer caused it to drop 90 points vs the hill, but
    there was no significant difference vs my benchmark. Both booted
    versions scored worse than unbooted.

    I think I've narrowed the issue down to "end label" not always setting
    the correct start address. Here's an example:

    ;redcode-94nop
    ;name broken
    ;author John Metcalf
    ;assert 1

    mov.i #1, 1
    d dat 1, 1
    end d

    It compiles correctly on KOTH.org:

    Program "broken" (length 2) by "John Metcalf"

    ORG START
    MOV.I # 1, $ 1
    START DAT.F $ 1, $ 1

    It should die on the first cycle. However, the score vs the hill is like
    an imp - 4% wins, 45% ties and 51% losses. I tested pMARS 0.8.0, 0.8.5,
    0.8.6, 0.9.2 and 0.9.4, and it scored as expected (like a dat).

    Can anyone narrow this down any further? Is it a pMARS issue, or
    something on KOTH?

    Thanks,

    John

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Metcalf@21:1/5 to John Metcalf on Tue Aug 9 15:09:02 2022
    This has been fixed now, thanks to Tuc. Koth had recently started to
    lose the "end" statement under specific circumstances.

    John

    On Tue, 02 Aug 2022 18:23:54 +0000, John Metcalf wrote:

    Hi,

    A couple of months ago I noticed strange behaviour from a warrior.
    Moving the boot pointer caused it to drop 90 points vs the hill, but
    there was no significant difference vs my benchmark. Both booted
    versions scored worse than unbooted.

    I think I've narrowed the issue down to "end label" not always setting
    the correct start address.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)