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BO operand encodings
0+y 0000y decrement CTR, then branch if CTR != 0 && condition is false
2+y 0001y decrement CTR, then branch if CTR == 0 && condition is false
4+y 0010y branch if condition is false
8+y 0100y decrement CTR, then branch if CTR != 0 && condition is true
10+y 0101y decrement CTR, then branch if CTR == 0 && condition is true
12+y 0110y branch if condition is true
16+y 1000y decrement CTR, then branch if CTR != 0
18+y 1001y decrement CTR, then branch if CTR == 0
20 10100 branch always
y=0:
BCx with negative displacement: branch probably taken
all other cases: branch not taken
y=1:
reverse prediction
predict to be taken if
((BO[0] & BO[2]) | sign(displacement)) xor y
CR field bit:
lt 0
gt 1
eq 2
so 3
un 3 (after fp comparison)
CR fields:
cr0 0
cr1 4
cr2 8
...
cr7 28
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