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Functional Unit Hazards
Table 6–6. Branch .S-Unit Instruction Hazards
Cycle
Branch
Instruction Type
Single-cycle
DP compare
2-cycle DP
Branch
Instruction Type
Single-cycle
Load
Store
INTDP
ADDDP/SUBDP
16
4-cycle
MPYI
MPYID
MPYDP
Legend:
6-24
Table 6–6 shows the instruction hazards for branch instructions executing on
the .S unit.
1
†
R
Same Side, Different Unit, Both Using Cross Path Executable
16 multiply
E1 phase of the single-cyle 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
Instruction Execution
2
3
4
5
Subsequent Same-Unit Instruction Executable
6
7
8
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