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As defined in Power 3.0 section 4.4.4 "Underflow Exception", a tiny result is detected before rounding. Fixes: https://bugs.launchpad.net/qemu/+bug/1841491 Reported-by: Paul Clarke <pc@us.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20190827020013.27154-1-richard.henderson@linaro.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>