softfloat: Add float128_to_uint64_round_to_zero()
Implement float128_to_uint64() and use that to implement float128_to_uint64_round_to_zero() This is required by xscvqpudz instruction of PowerPC ISA 3.0. Signed-off-by: NBharata B Rao <bharata@linux.vnet.ibm.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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