IF Register Ops

data stack registers return stack

d0 w r0

d1 a r1

d2 b r2

x

y

dp

rp

r=a,b,w,x,y

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

chw chw

r=r r+=r r-=r r|=r r^=r r&=r @r=r r=@r ~r -r r=0 r++ r-- r+=2 r-=2 r+=4 r-=4 r*=2 r/=2 r*=4 r/=4 rpop rpush pop push d0=r d1=r d2=r r=d0 r=d1 r=d2 r0=r r1=r r2=r r=r0 r=r1 r=r2 r==0 total

w 4 4 4 4 4 4 12 15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

a 1 4 4 4 4 4 3 3 1 1 1 1 1 1

b 1 4 4 4 4 4 3 3 1 1 1 1 1 1

x 1 4 4 4 4 4 3 3 1 1 1 1 1 1

y 1 4 4 4 4 4 3 3 1 1 1 1 1 1

{1 * 31 * 5} = 155

{4 * 6 * 5} = 120

{27 * 5} = 135

(atmega) data + instruction bytes {2 4 2 2 6} = 16

(arm thumb) {2 4 2 2 4} = 14

410 * 16 = 6560

@ register ops

@ w+=#

@ w=x+y

@ w=y+x

@ w=a+b

@ w=b+a

@ w=a+x

@ w=a+y

@ a=w+x

@ w=b-a

@ w=a-b

@ a+=w

@ x=@b

@ b=@x

@ a=@x

@ y=@x

@ w=@x

@ x=@x

@ b=h@x

@ a=h@x

@ y=h@x

@ w=h@x

@ x=h@x

@ b=c@x

@ a=c@x

@ y=c@x

@ w=c@x

@ x=c@x

@x=0

h@x=0

c@x=0

@ b+=x

@ a+=x

@ x+=x

@ y+=x

@ w+=x