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Proof step 2 from proof refine-read-vidhdr (previous step)

avhdr = avhdr0, m0 = EB_PAGE_SIZE, abs(pebs, apebs), mtd-cons(pebs), ubi-io-inv(apebs), ubi-io-read-vidhdr-pre(m, apebs) ⊦ ⟪ubi_io_read_vidhdr#(m, m0, pebs; avhdr; bitflips, err)⟫ ⟨aubi_io_read_vidhdr#(m, apebs; avhdr0; isbad, err0)⟩ (abs(pebs, apebs) ∧ avhdr = avhdr0 ∧ (bitflips ↔ isbad) ∧ err = err0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
avhdr = avhdr0, m < # apebs, abs(pebs, apebs), mtd-cons(pebs), ubi-io-inv(apebs), ¬ apebs[m].bad ⊦ ⟪ubi_io_read_vidhdr#(m, EB_PAGE_SIZE, pebs; avhdr; bitflips, err)⟫ ⟨aubi_io_read_vidhdr#(m, apebs; avhdr0; isbad, err0)⟩ (avhdr = avhdr0 ∧ (bitflips ↔ isbad) ∧ err = err0)

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic% ⊦ ubi-io-read-vidhdr-pre(n, apebs) ↔ n < # apebs ∧ ¬ apebs[n].bad; (s)