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Proof step 66 from proof byte-law-righthift-not (previous step)

i2b(bits2int(sublist(0, # fillsgn(32, int2bits(128)), false ' + fillsgn(32, int2bits(128))))) = i2b(bits2uint(firstn(31, fillsgn(32, int2bits(~128))))), # int2bits(~128) ≤ 32 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ # bits ≤ n → # fillsgn(n, bits) = n subst: [bits, n] → [int2bits(128), 32] rotate: F spec: bitopsaux inst: name: fill-length

Additional information

Used terms: int2bits(128), 32