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Proof step 1 from proof long-on-bits (conclusion)

⊦ l2i(i2l(i)) = bits2int(lastn(64, fillsgn(64, int2bits(i))))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ bits2int(lastn(n, fillsgn(n, int2bits(i)))) = cast(n→i(n), i)
Proof step 3:
⊦ l2i(i2l(i)) = cast(n→i(64), i)

Rule argument

seq: ⊦ bits2int(lastn(n, fillsgn(n, int2bits(i)))) = cast(n→i(n), i) subst: [i, n] → [i, 64] rotate: F spec: intops inst: name: bits2int-is-cast-01

Additional information

Used terms: i, 64