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Proof step 11 from proof inv-read-vidhdr (previous step)

pebs[m0] = mkpeb(buf0, m1, false), buf = mkbuf(EB_PAGE_SIZE), buf = buf, buf1 = buf, m2 = m0, m3 = EB_PAGE_SIZE, n1 = EB_PAGE_SIZE, n2 = 0, pebs0 = pebs, m0 < # pebs, mtd-cons(pebs), EB_PAGE_SIZE + EB_PAGE_SIZE ≤ PEB_SIZE, 0 + EB_PAGE_SIZE ≤ # buf ⊦ [ubi_io_read#(m0, EB_PAGE_SIZE, 0, EB_PAGE_SIZE, pebs; buf; bitflips, err)] ( # buf = # buf1 ∧ range=(buf, 0, buf1, 0, n2) ∧ range=(buf, n2 + n1, buf1, n2 + n1, # buf1 - n2 + n1) ∧ (err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → subarray(buf, n2, n1) = subarray(pebs0[m2].data, m3, n1)) → ⟪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)}⟫ true), pebs[m0].bad

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
pebs[m0] = mkpeb(buf0, m1, false), buf = mkbuf(EB_PAGE_SIZE), m0 < # pebs, mtd-cons(pebs), 2 * EB_PAGE_SIZE ≤ PEB_SIZE ⊦ [ubi_io_read#(m0, EB_PAGE_SIZE, 0, EB_PAGE_SIZE, pebs; buf; bitflips, err)] ( # buf = EB_PAGE_SIZE ∧ EB_PAGE_SIZE ≤ # buf ∧ (err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → buf = subarray(pebs[m0].data, EB_PAGE_SIZE, EB_PAGE_SIZE)) → ⟪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)}⟫ true)

Rule argument

Additional information

Used simplifier rules: ⊦ m - m = 0; (s)% ⊦ mkpeb(buf, m, boolvar).bad ↔ boolvar; (s)%# buf = n ⊦ subarray(buf, 0, n) = buf; (s)% ⊦ 0 ≤ m; (s)% ⊦ range=(buf, n0, buf0, n1, 0) ↔ n0 ≤ # buf ∧ n1 ≤ # buf0; (s)% ⊦ m + m = 2 * m; (s)% ⊦ m ≤ m; (s)% ⊦ # mkbuf(n) = n; (s)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ n + 0 = n; (s)