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s390x/tcg: Hide IEEE underflows in some scenarios
IEEE underflows are not reported when the mask bit is off and we don't also have an inexact exception. z14 PoP, 9-20, "IEEE Underflow": An IEEE-underflow exception is recognized for an IEEE target when the tininess condition exists and either: (1) the IEEE-underflow mask bit in the FPC register is zero and the result value is inexact, or (2) the IEEE-underflow mask bit in the FPC register is one. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20190218122710.23639-6-david@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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