Texas Instruments TMS320C28x Reference Manual page 267

IMPYXUL P,XT,loc32
Example
; Calculate result: Y64 = M64*X64 + B64
; Y64 = Y1:Y0, M64 = M1:M0, X64 = X1:X0, B64 = B1:B0
MOVL
IMPYL
MOVL
ADDUL
MOVL
QMPYUL
MOVL
MOVL
IMPYXUL P,XT,@M0
MOVL
ADDCL
IMPYXUL P,XT,@X0
ADDUL
ADDUL
MOVL
6-110
XT,@X0 ; XT
P,XT,@M0 ; P
ACC,@B0 ; ACC = B0
ACC,@P ; ACC = ACC + P
@Y0,ACC ; Store result into Y0
P,XT,@M0 ; P
XT,@X1 ; XT
ACC,@P ; ACC = P
; P
XT,@M1 ; XT
ACC,@P ; ACC = ACC + P + carry
; P
ACC,@P ; ACC = ACC + P
ACC,@B1 ; ACC = ACC + B1
@Y1,P ; Store result into Y1
= X0
= low 32 bits of (uns M0 * uns X0)
= high 32 bits of (uns M0 * uns X0)
= X1
= low 32 bits of (uns M0 * sign X1)
= M1
= low 32 bits of (sign M1 * uns X0)