Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 206)

MPYDP Multiply Two Double-Precision Floating-Point Values
3-146 Instruction Set SPRU733
Pipeline
Stage
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10
Read src1_l
src2_l src1_l
src2_h
src1_h
src2_l
src1_h
src2_h
Written dst_l dst_h
Unit in use .M .M .M .M
If dst is used as the source for the ADDDP, CMPEQDP, CMPLTDP,
CMPGTDP, MPYDP, 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 MPYDP
Delay Slots 9
Functional Unit
Latency 4
See Also MPY, MPYSP
Example MPYDP .M1 A1:A0,A3:A2,A5:A4
Before instruction 10 cycles after instruction
A1:A0 4021 3333h 3333 3333h 8.6 A1:A0 4021 3333h 4021 3333h 8.6
A3:A2 C004 0000h 0000 0000 −2.5 A3:A2 C004 0000h 0000 0000h −2.5
A5:A4 XXXX XXXXh XXXX XXXXh A5:A4 C035 8000h 0000 0000h −21.5
Pipeline