Architecture floating-point underflow information wanted

[Richard Henderson]

On 09/25/2012 08:29 AM, Uros Bizjak wrote:
>> > alpha
> cpu                     : Alpha
> cpu model               : EV68AL
> cpu variation           : 7
> cpu revision            : 0
> 
> The test returns "after rounding".

FWIW, you're testing the kernel implementation.

# The 21264 will not produce a Denormal result for the underflow
# exception. Instead, a true zero (+0) is written to the destination
# register. In the 21264 the FPCR underflow to zero (UNDZ) bit must
# be set if underflow disable (UNFD) bit is set. If desired, trapping
# on underflow can be enabled by the instruction and the FPCR, and
# software may compute the Denormal value as defined in the IEEE Standard.


r~