Re: [Qemu-devel] [PATCH] softfloat: don't execute ppc64 ISA 3.0B instruction if it is not supported

[Richard Henderson]

On 11/1/18 5:38 PM, Laurent Vivier wrote:
> commit 27ae5109a2 has introduced an assembly instruction only supported
> by ISA 3.0B and it fails to execute on previous versions of the POWER
> CPU (like PowerPC G5).
> 
> This patch fixes that by checking the ISA level, and falls back to
> the default C function if the instruction is not supported.
> 
> Fixes: 27ae5109a2ba8b6b679cce3e03e16570a34390a0
>        (softfloat: Specialize udiv_qrnnd for ppc64)
> Signed-off-by: Laurent Vivier <address@hidden>
> ---
>  include/fpu/softfloat-macros.h | 39 ++++++++++++++++++++--------------
>  1 file changed, 23 insertions(+), 16 deletions(-)

Blah.  The divdeu insn was added into v2.06.

I knew I had tested this with a power7 host, which I think of as old.
But I guess not old enough.  I'll work something up.


r~