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In FPU.scala:
// we don't currently support round-max-magnitude (rm=4)
io.illegal_rm := io.inst(14,12).isOneOf(5.U, 6.U) || io.inst(14,12) === 7.U && io.fcsr_rm >= 5.U
It seems that rm=4(round to nearesr, with tie to Max magnitude) is currently supported.
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