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Proof step 19 from proof crash-neutral-write-data-wl (previous step)

apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), n1 = align↑(datasize(buf, n1), EB_PAGE_SIZE), datasize(buf, n1) ≠ 0, aehdr.valid?, avhdr.valid?, n2 < # apebs, ubi-io-inv(apebs), n1 ≤ LEB_SIZE, n1 ≤ # buf ⊦ ⟨apebs1 := apebs[n2, mkpeb(apebs[n2].echdr, apebs[n2].vidhdr, mkempbuf(LEB_SIZE - 0), 0, apebs[n2].bad)]⟩ (apebs = apebs1)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 20:
apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), n1 = align↑(datasize(buf, n1), EB_PAGE_SIZE), avhdr.valid?, aehdr.valid?, n2 < # apebs, ubi-io-inv(apebs), n1 ≤ # buf, n1 ≤ LEB_SIZE, LEB_SIZE ≥ 0 ⊦ apebs = apebs[n2, mkpeb(apebs[n2].echdr, apebs[n2].vidhdr, mkempbuf(LEB_SIZE - 0), 0, apebs[n2].bad)], datasize(buf, n1) = 0

Rule argument

Additional information

Used simplifier rules: ⊦ n ≥ m ↔ m ≤ n; (s)% ⊦ 0 ≤ m; (s)