Texas Instruments TMS320C28x Reference Manual page 472

Example
; Add 64-bit VarA, VarB and VarC, sat and store result in VarD:
ZAP
MOVL
ADDUL P,@VarB+0
ADDUL P,@VarC+0
MOVU
MOVB
ZAP
ADDL
ADDL
ADDL
SAT64 ACC:P
MOVL
MOVL
OVC ; Clear overflow counter
P,@VarA+0 ; Load P with low 32-bits of VarA
; Add to P unsigned low 32-bits of VarB
; Add to P unsigned low 32-bits of VarC
@AL,OVC ; Store overlow (repeated carry) in the ACC
; and then add higher portion of the 64 bit
; variables
AH,#0 ; Store overlow (repeated carry) in the ACC
; and then add higher portion of the 64 bit
; variables
OVC ; Clear overflow counter
ACC,@VarA+2 ; Add to ACC with carry high 32-bits of VarA
ACC,@VarB+2 ; Add to ACC with carry high 32-bits of VarB
ACC,@VarC+2 ; Add to ACC with carry high 32-bits of VarC
; Saturate ACC:P based on OVC value
@VarD+0,P ; Store low 32-bit result into VarD
@VarD+2,ACC ; Store high 32-bit result into VarD
SAT64 ACC:P
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