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Proof step 51 from proof refine-read-echdr (previous step)

pebs[m2] = mkpeb(buf1, m, false), apebs[m2] = mkpeb(aehdr1, avhdr, buf0, m1, false), aehdr = aehdr0, err = ESUCCESS, m2 < # apebs, m2 < # pebs, abs(pebs, apebs), abs-peb(mkpeb(buf1, m, false), mkpeb(aehdr1, avhdr, buf0, m1, false)), mtd-cons(pebs), ubi-io-inv(apebs), EB_PAGE_SIZE ≤ PEB_SIZE, err = ESUCCESS → is-encoded(ehdr, subarray(buf1, 0, EB_PAGE_SIZE)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟨aubi_io_read_echdr#(m2, apebs; aehdr0; isbad, err0)⟩ (aechdr(ehdr.ec) = aehdr0 ∧ (bitflips ↔ isbad) ∧ err = err0), subarray(buf1, 0, EB_PAGE_SIZE) = emptypage

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 52:
pebs[m2] = mkpeb(buf1, m, 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, m, false), mkpeb(aehdr1, avhdr, buf0, m1, false)), is-encoded(ehdr, subarray(buf1, 0, EB_PAGE_SIZE)), mtd-cons(pebs), ubi-io-inv(apebs), EB_PAGE_SIZE ≤ PEB_SIZE ⊦ ⟨aubi_io_read_echdr#(m2, apebs; aehdr0; isbad, err0)⟩ (aechdr(ehdr.ec) = aehdr0 ∧ (bitflips ↔ isbad) ∧ ESUCCESS = err0)

Rule argument

Additional information

Used simplifier rules: ⊦ # subarray(buf, m, n) = n; (s)%is-encoded-size: ⊦ is-encoded(ehdr, buf) → # buf = EB_PAGE_SIZE; (forward) from specification encoding-page-size-nonempty[encoding-echeader]