at94k40al ATMEL Corporation, at94k40al Datasheet - Page 124

• Manufacturer Part Number: at94k40al
• Description: At94kal Series Field Programmable System Level Integrated Circuit
• Manufacturer: ATMEL Corporation

4.28.7.4
124
AT94KAL Series FPSLIC
mac16x16_32
Description
Usage
Statistics
Signed multiply-accumulate of two 16-bit numbers with a 32-bit result.
R19:R18:R17:R16 += R23:R22 • R21:R20
Cycles: 23 + ret
Words: 19 + ret
Register usage: R0 to R2 and R16 to R23 (11 registers)
mac16x16_32:
mac16x16_32_method_B:
Size
clr
muls
add
adc
mul
add
adc
adc
adc
mulsu r23, r20
sbc
add
adc
adc
mulsu r21, r22
sbc
add
adc
adc
ret
clr
muls
movw
r2
r23, r21
r18, r0
r19, r1
r22, r20
r16, r0
r17, r1
r18, r2
r19, r2
r19, r2
r17, r0
r18, r1
r19, r2
r19, r2
r17, r0
r18, r1
r19, r2
r2
r23, r21
r5:r4,r1:r0
; Register Usage Optimized
; (signed)ah * (signed)bh
; al * bl
; (signed)ah * bl
; (signed)bh * al
; Sign extend
; uses two temporary registers (r4,r5), Speed /
Optimized
; but reduces cycles/words by 1
; (signed)ah * (signed)bh
1138I–FPSLI–1/08