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Proof step 8 from proof refine-read-vidhdr (previous step)

apebs[m2] = mkpeb(aehdr, avhdr1, buf0, m1, false), avhdr = avhdr0, buf = mkbuf(m), m = EB_PAGE_SIZE, m0 = m2, m2 < # apebs, m0 < # pebs, abs(pebs, apebs), mtd-cons(pebs), ubi-io-inv(apebs), m0 < # pebs → m0 < # pebs ⊦ ⟪ubi_io_read#(m0, m, 0, m, pebs; buf; bitflips, err); if err = ESUCCESS then if isempty(buf) then avhdr := empty else let vhdr = ? in {decode_vidheader#(m, buf; vhdr; err); if err = ESUCCESS then avhdr := avidhdr(vhdr.vol, vhdr.leb, vhdr.sqn, vhdr.size, vhdr.checksum)}⟫ ⟨aubi_io_read_vidhdr#(m2, apebs; avhdr0; isbad, err0)⟩ (avhdr = avhdr0 ∧ (bitflips ↔ isbad) ∧ err = err0), pebs[m0].bad

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 9:
apebs[m2] = mkpeb(aehdr, avhdr1, buf0, m1, false), buf = mkbuf(EB_PAGE_SIZE), m2 < # apebs, m2 < # pebs, abs(pebs, apebs), mtd-cons(pebs), ubi-io-inv(apebs), ¬ pebs[m2].bad ⊦ ⟪ubi_io_read#(m2, EB_PAGE_SIZE, 0, EB_PAGE_SIZE, pebs; buf; bitflips, err); avhdr := avhdr0; if err = ESUCCESS then if buf = mkempbuf(# buf) then avhdr := empty else let vhdr = ? in {decode_vidheader#(EB_PAGE_SIZE, buf; vhdr; err); if err = ESUCCESS then avhdr := avidhdr(vhdr.vol, vhdr.leb, vhdr.sqn, vhdr.size, vhdr.checksum)}⟫ ⟨aubi_io_read_vidhdr#(m2, 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% ⊦ isempty(buf) ↔ buf = mkempbuf(# buf); (s)