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Proof step 56 from proof refine-read-echdr (previous step)

pebs[m2] = mkpeb(buf1, m3, false), apebs[m2] = mkpeb(aehdr1, avhdr, buf0, m1, false), aehdr = aehdr0, m = m2, m2 < # apebs, m2 < # pebs, abs(pebs, apebs), abs-peb(mkpeb(buf1, m3, false), mkpeb(aehdr1, avhdr, buf0, m1, false)), is-encoded(echdr(m0), subarray(buf1, 0, EB_PAGE_SIZE)), mtd-cons(pebs), ubi-io-inv(apebs), ubi-io-read-echdr-pre(m, apebs), EB_PAGE_SIZE ≤ PEB_SIZE ⊦ ⟨fail_or_success#(; ; err); bitflips := ?; if err = ESUCCESS then aehdr := apebs[m].echdr else aehdr := ?⟩ (aechdr(m0) = aehdr ∧ (bitflips0 ↔ bitflips) ∧ ESUCCESS = err), subarray(buf1, 0, EB_PAGE_SIZE) = emptypage

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 57:
pebs[m2] = mkpeb(buf1, m3, false), apebs[m2] = mkpeb(aehdr1, avhdr, buf0, m1, false), subarray(buf1, 0, EB_PAGE_SIZE) ≠ emptypage, m2 < # apebs, m2 < # pebs, abs(pebs, apebs), abs-peb(mkpeb(buf1, m3, false), mkpeb(aehdr1, avhdr, buf0, m1, false)), is-encoded(echdr(m0), subarray(buf1, 0, EB_PAGE_SIZE)), mtd-cons(pebs), ubi-io-inv(apebs), EB_PAGE_SIZE ≤ PEB_SIZE ⊦ ⟨fail_or_success#(; ; err); bitflips := ?; if err = ESUCCESS then aehdr := apebs[m2].echdr else aehdr := ?⟩ (aechdr(m0) = aehdr ∧ (bitflips0 ↔ bitflips) ∧ ESUCCESS = err)

Rule argument

Additional information

Used simplifier rules: ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).bad ↔ boolvar; (s)%abs-fwd: ⊦ n < # pebs ∧ pebs[n] = peb ∧ abs(pebs, apebs) → n < # apebs ∧ abs-peb(peb, apebs[n]); (forward) from specification ubi-io-abs% ⊦ ubi-io-read-echdr-pre(n, apebs) ↔ n < # apebs ∧ ¬ apebs[n].bad; (s)