Texas Instruments TMS320C6000 Programmer's Manual page 267

Memory Banks
Example 6–69. Final Assembly Code for FIR Filter With Redundant Load Elimination
and No Memory Hits (Continued)
LOOP:
ADD
|| ADD
|| MPY
|| MPY
||[B2] LDH
||[B2] LDH
ADD
|| ADD
|| MPY
|| MPY
||[B2] LDH
||[B2] LDH
ADD
|| ADD
||[B2] B
|| MPY
|| MPY
||[B2] LDH
||[B2] LDH
||[B2] SUB
ADD
|| ADD
|| MPY
|| MPY
||[B2] LDH
||[B2] LDH
; inner loop branch occurs here
[A2] B
|| SUB
|| SUB
|| SUB
SHR
|| SHR
STH
STH
NOP
; outer loop branch occurs here
6-130
.L2X A1,B9,B9
.L1X B6,A9,A9
.M2 B5,B8,B7
.M1 A5,A7,A7
.D1 *A8++[2],B6
.D2 *B4++[2],A1
.L2 B7,B9,B9
.L1 A5,A9,A9
.M1X B5,A1,A0
.M2X A0,B6,B6
.D1 *A4++[2],A5
.D2 *B1++[2],B5
.L2X A7,B9,B9
.L1X B8,A9,A9
.S1 LOOP
.M2 B0,B6,B7
.M1 A0,A1,A1
.D2 *B4++[2],A7
.D1 *A8++[2],B8
.S2 B2,1,B2
.L2 B7,B9,B9
.L1 A0,A9,A9
.M2X A5,B8,B8
.M1X B0,A7,A5
.D2 *B1++[2],B0
.D1 *A4++[2],A0
.S2 OUTLOOP
.L1 A4,A3,A4
.L2 B4,B10,B4
.S1 A9,A0,A9
.S1 A9,15,A9
.S2 B9,15,B9
.D1 A9,*A6++
.D1 B9,*A6++
2
; sum1 += x1 * h0
; sum0 += x1 * h1
; x0 * h3
; x3 * h2
;** h1 = h[i+1]
;** h0 = h[i]
; sum1 += x2 * h1
; sum0 += x2 * h2
;* x0 * h0
;* x1 * h1
;** x3 = x[j+i+3]
;** x0 = x[j+i+4]
; sum1 += x3 * h2
; sum0 += x3 * h3
;* branch to loop
;* x2 * h1
;* x1 * h0
;** h2 = h[i+2]
;** h3 = h[i+3]
;** decrement loop counter
; sum1 += x0 * h3
;* sum0 += x0 * h0
;* x3 * h3
;* x2 * h2
;*** x2 = x[j+i+2]
;*** x1 = x[j+i+1]
; branch to outer loop
; reset x pointer to x[j]
; reset h pointer to h[0]
; sum0 –= x0*h0 (eliminate add)
; sum0 >> 15
; sum1 >> 15
; y[j] = sum0 >> 15
; y[j+1] = sum1 >> 15
; branch delay slots