Re: [Qemu-devel] sparc y register

[Blue Swirl]

On 9/11/08, Vince Weaver <address@hidden> wrote:
> Hello
>
>  I'm wasting a lot of time trying to get the sixtrack spec2k benchmark
> going.  (It crashes 30 minutes into the program, deep in a long FORTRAN
> program).  One of the problems eventually traces back to a routine reading
> long floating point numbers from a text file.
>
>  In any case, part of the problem is that the write y instruction is writing
> a 64-bit value, but from what I can tell in the documentation the top
> 32-bits of y should always be zero.
>
>  What this means is sometimes in sparc32plus mode, we write a register to y
> that has some of the higher 32 bits set, which causes later mulscc
> instructions to get the wrong results.
>
>  The patch below seems to fix this particular problem (and a test case I
> have that exhibits it) but it seems as if there's still another bug at work
> somewhere because sixtrack still won't run.

Thanks, I applied a fix based on this. There was also a similar
problem in mulscc, maybe your tests run better now?