at94k10al ATMEL Corporation, at94k10al Datasheet - Page 126

• Manufacturer Part Number: at94k10al
• Description: At94k05al 5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
• Manufacturer: ATMEL Corporation

4.28.7.5
126
AT94KAL Series FPSLIC
fmuls16x16_32
Description
Usage
Statistics
Note:
Signed fractional multiply of two 16-bit numbers with a 32-bit result.
R19:R18:R17:R16 = (R23:R22 • R21:R20) << 1
Cycles: 20 + ret
Words: 16 + ret
Register usage: R0 to R2 and R16 to R23 (11 registers)
fmuls16x16_32:
clr
fmuls r23, r21
movw
fmul
adc
movw
fmulsu
sbc
add
adc
adc
fmulsu
sbc
add
adc
adc
ret
1. The routine is non-destructive to the operands.
r2
r19:r18, r1:r0
r22, r20
r18, r2
r17:r16, r1:r0
r19, r2
r17, r0
r18, r1
r19, r2
r19, r2
r17, r0
r18, r1
r19, r2
r23, r20
r21, r22
; ( (signed)ah * (signed)bh ) << 1
; ( al * bl ) << 1
; ( (signed)ah * bl ) << 1
; Sign extend
; ( (signed)bh * al ) << 1
; Sign extend
(1)
1138I–FPSLI–1/08