Dependency Graph Of Fixed-Point Dot Product With Ldw (Showing Functional Units) - Texas Instruments TMS320C6000 Programmer's Manual

Software Pipelining
Figure 6–9. Dependency Graph of Fixed-Point Dot Product With LDW
(Showing Functional Units)
Example 6–21. Linear Assembly for Fixed-Point Dot Product Inner Loop
(With Conditional SUB Instruction)
LDW .D1
LDW .D2
MPY .M1X
MPYH .M2X
ADD .L1
ADD .L2
[A1] SUB .S1
[A1] B .S2
6-30
A side
LDW
.D1
ai & ai+1
5
5
MPY
pi
.M1X
2
ADD
1
.L1
sum0
SUB
1
.S1
cntr
1
*A4++,A2 ; load ai and ai+1 from memory
*B4++,B2 ; load bi and bi+1 from memory
A2,B2,A6 ; ai * bi
A2,B2,B6 ; ai+1 * bi+1
A6,A7,A7 ; sum0 += (ai * bi)
B6,B7,B7 ; sum1 += (ai+1 * bi+1)
A1,1,A1 ; decrement loop counter
LOOP ; branch to top of loop
B side
LDW
.D2
bi & bi+1
5
5
MPYH
pi+1
.M2X
2
ADD
1
sum1
.L2
B
LOOP .S2