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Proof step 23 from proof inv-write-data-wl (previous step)

apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), n1 = align↑(datasize(buf, n1), EB_PAGE_SIZE), avhdr.valid?, aehdr.valid?, n2 < # apebs, is-aligned(# buf1, EB_PAGE_SIZE), ubi-io-inv(apebs), n1 ≤ # buf, n1 ≤ LEB_SIZE, # buf1 ≤ n1, LEB_SIZE ≥ # buf1, ⌊err0⌋ ∨ err0 = ESUCCESS, datasize(buf1, # buf1) < datasize(buf, n1) ∨ checksum(buf1 + mkempbuf(n1 - # buf1), datasize(buf, n1)) ≠ checksum(buf, datasize(buf, n1)) ⊦ datasize(buf, n1) = 0, err0 = ESUCCESS, ubi-io-inv(apebs[n2, mkpeb(apebs[n2].echdr, apebs[n2].vidhdr, buf1 + mkempbuf(LEB_SIZE - # buf1), # buf1, apebs[n2].bad)])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 24:
apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), n1 = align↑(datasize(buf, n1), EB_PAGE_SIZE), avhdr.valid?, aehdr.valid?, n2 < # apebs, is-aligned(# buf1, EB_PAGE_SIZE), ubi-io-inv(apebs), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf0, 0, false)), # buf1 ≤ # buf, # buf1 ≤ LEB_SIZE, n1 ≤ # buf, n1 ≤ LEB_SIZE, # buf1 ≤ n1, ⌊err0⌋ , datasize(buf1, # buf1) < datasize(buf, n1) ∨ checksum(buf1 + mkempbuf(n1 - # buf1), datasize(buf, n1)) ≠ checksum(buf, datasize(buf, n1)) ⊦ datasize(buf, n1) = 0, ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf1 + mkempbuf(LEB_SIZE - # buf1), # buf1, false))

Rule argument

Additional information

Used simplifier rules: ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).bad ↔ boolvar; (s)% ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).vidhdr = avhdr; (s)% ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).echdr = aehdr; (s)%let: ⊦ n ≤ n0 ∧ n0 ≤ n1 → n ≤ n1; (forward) from specification nat% ⊦ ⌊err⌋ → err ≠ ESUCCESS; (s)%⊦ ubi-io-inv(apebs) → ( ubi-io-inv(apebs[n, apeb]) ↔ n < # apebs ∧ ubi-io-peb-inv(apebs[n]) → ubi-io-peb-inv(apeb)); (ss)% ⊦ n ≥ m ↔ m ≤ n; (s)