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Pipeline Execution of Instruction Types
Pipeline4-28 SPRU733
4.2.10 ADDDP/SUBDP Instructions
The ADDDP/SUBDP instructions use the E1 through E7 phases of the pipeline
to complete their operations (see Table 4−12). The lower 32 bits of the result
are written on E6, and the upper 32 bits of the result are written on E7. The
ADDDP/SUBDP instructions are executed on the .L unit. The functional unit
latency for ADDDP/SUBDP instructions is 2. The status is written to the
FADCR on E6. Figure 4−22 shows the fetch, decode, and execute phases of
the pipeline that the ADDDP/SUBDP instructions use.
Table 4−12. ADDDP/SUBDP Instruction Execution
Pipeline Stage
E1 E2 E3 E4 E5 E6 E7
Read src1_l
src2_l
src1_h
src2_h
Written dst_l dst_h
Unit in use
.L or .S .L or .S
Figure 4−22. ADDDP/SUBDP Instruction Phases
PG PS PW PR DP DC E1 E2 E3 E4 E5 E6 E7
6 delay slots