Multiply Single-Precision Value x Double-Precision Value (C67x+ CPU) MPYSPDP
3-169 Instruction SetSPRU733
Pipeline
Stage
E1 E2 E3 E4 E5 E6 E7
Read src1
src2_l
src1
src2_h
Written dst_l dst_h
Unit in use
.M .M
The low half of the result is written out one cycle earlier than the high half. If
dst is used as the source for the ADDDP, CMPEQDP, CMPLTDP, CMPGTDP,
MPYDP, MPYSPDP, MPYSP2DP, or SUBDP instruction, the number of delay
slots can be reduced by one, because these instructions read the lower word
of the DP source one cycle before the upper word of the DP source.
Instruction Type MPYSPDP
Delay Slots 6
Functional Unit
Latency
3
See Also MPY, MPYDP, MPYSP, MPYSP2DP
Pipeline
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