Texas Instruments TMS320C28x - Page 267

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