Re: [hatari-devel] Re: FPU emulation issue with Q2

[Douglas Little <doug694@xxxxxxxxxxxxxx>]

Well I tried the latest version of Hatari with the same program - and guess what? It works :D

Thanks Toni, Nicolas, Eero for helping.

I suppose that nearly classifies as a schrödinbug? But it needs a new classification - a bug that suddenly manifests *everywhere* only after it's been communicated - I've seen a few of these in my time :-D

http://en.wikipedia.org/wiki/Heisenbug

D

On 29 April 2015 at 00:04, Douglas Little <doug694@xxxxxxxxxxxxxx> wrote:

Hi - I'll let you both know very soon. Thanks for the update :)

D

On 28 April 2015 at 22:07, Nicolas Pomarède <npomarede@xxxxxxxxxxxx> wrote:

Le 28/04/2015 21:23, Toni Wilen a écrit :

I may have found the bug. I just debugged some unrelated Amiga stuff and
noticed weird FPU related crash that only happened in more compatible/ce
modes.

FBcc instructions don't fully reload instruction prefetch pipeline when
they branch. I forgot that some FPU instructions can change PC without
causing exception...

Patch coming soon.

Hi

thanks for the patch, I just pushed it to the main repo.

Doug, could you test if this solve your crashes ?

Nicolas