Functional Unit Constraints
4-39PipelineSPRU733
Table 4−23 shows the instruction constraints for branch instructions executing
on the .S unit.
Table 4−23. Branch .S-Unit Instruction Constraints
Instruction Execution
Cycle 1 2 3 4 5 6 7 8
Branch
†
R
Instruction Type
Subsequent Same-Unit Instruction Executable
Single-cycle
DP compare
2-cycle DP
ADDDP/SUBDP
ADDSP/SUBSP
Branch
Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle
Load
Store
INTDP
ADDDP/SUBDP
16 × 16 multiply
4-cycle
MPYI
MPYID
MPYDP
Legend: = E1 phase of the single-cycle instruction; R = Sources read for the instruction; = Next instruction can enter E1
during cycle
†
The branch on register instruction is the only branch instruction that reads a general-purpose register
To Next Page