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2f1a8ee1b9
Operations that have two operands and can't generate a default NaN, i.e. addition and subtraction, already have the desired NaN handling on x86. We just need to make sure to not reverse the operands. This fixes ps_sum0/ps_sum1 outputting NaNs in cases where they shouldn't. (HandleNaNs assumes that a NaN in a ps0 input always results in a NaN in the ps0 output, and correspondingly for ps1.)