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B Branch Using a Register
3-72 Instruction Set SPRU733
Target Instruction
Pipeline
Stage
E1 PS
PW PR DP DC E1
Read src2
Written
Branch
Taken
Unit in use
.S2
Instruction Type Branch
Delay Slots 5
Example Table 3−14 gives the program counter values and actions for the following
code example. In this example, the B10 register holds the value 1000 000Ch.
B10 1000 000Ch
1000 0000 B .S2 B10
1000 0004 ADD .L1 A1, A2, A3
1000 0008 || ADD .L2 B1, B2, B3
1000 000C MPY .M1X A3, B3, A4
1000 0010 || SUB .D1 A5, A6, A6
1000 0014 MPY .M1 A3, A6, A5
1000 0018 MPY .M1 A6, A7, A8
1000 001C SHR .S1 A4, 15, A4
1000 0020 ADD .D1 A4, A6, A4
Table 3−14. Program Counter Values for Example Branch Using a Register
Cycle Program Counter Value Action
Cycle 0 1000 0000h Branch command executes
(target code fetched)
Cycle 1 1000 0004h
Cycle 2 1000 000Ch
Cycle 3 1000 0014h
Cycle 4 1000 0018h
Cycle 5 1000 001Ch
Cycle 6 1000 000Ch Branch target code executes
Cycle 7
1000 0014h
Pipeline