Denormalised numbers on arm

[Peter Jeremy]

I've been tracking down the cause of some test failures on my RPi
(running armv6hf head r283107) and found that denormalised numbers are
flushed to zero.  This appears deliberate (r263913 initialised the
fpscr so denormalised numbers are flushed to zero) but isn't what is
expected from IEEE FP arithmetic.  The commit doesn't include any
explanation for setting this (mis)behaviour.

Can someone explain why Arm defaults to flush-to-zero?

-- 
Peter Jeremy
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