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Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a grou
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation |
Date: |
Fri, 1 Jul 2011 16:24:39 +0200 |
On Fri, Jul 1, 2011 at 4:11 PM, Jakub Jermar <address@hidden> wrote:
[...]
> Actually, the testcase can be further reduced into:
>
> .global _start
>
> .text
>
> .space 0x20
>
> _start:
> set 110393, %i1
> set 0x40, %i2
>
> cmp %i1, %i2
> udivx %g0, 1, %g0
> movgu %xcc, %i2, %i1
> cmp %i1, 512
> bgu %xcc, 0f
> nop
>
> succ:
> ta 0
>
> fail:
> 0:
> ta 1
>
> The presence of the `udivx` instruction seems to be essential. Even
> though it has no effect on the computation, removing it will make the
> testcase non-reproducible.
Could you try to replace udivx with sdivx? It looks wrong too.
Laurent
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Artyom Tarasenko, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Laurent Desnogues, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Jakub Jermar, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Artyom Tarasenko, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Laurent Desnogues, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Artyom Tarasenko, 2011/07/01
- Re: [Qemu-devel] [HelenOS-devel] [sparc64] Miscomputed minimum of a group of numbers in sparc64 emulation, Artyom Tarasenko, 2011/07/01