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Proof step 13 from proof inv-read-vidhdr (previous step)

pebs[m0] = mkpeb(buf0, m1, false), buf = mkbuf(EB_PAGE_SIZE), m0 < # pebs, mtd-cons(pebs), 2 * EB_PAGE_SIZE ≤ PEB_SIZE ⊦ ∀ 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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
# buf1 = EB_PAGE_SIZE, pebs[m0] = mkpeb(buf0, m1, false), m0 < # pebs, mtd-cons(pebs), 2 * EB_PAGE_SIZE ≤ PEB_SIZE, err = ESUCCESS → buf1 = subarray(buf0, EB_PAGE_SIZE, EB_PAGE_SIZE), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪if err = ESUCCESS then if buf1 = emptypage then avhdr := empty else let vhdr = ? in {decode_vidheader#(EB_PAGE_SIZE, buf1; 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: ⊦ mkempbuf(EB_PAGE_SIZE) = emptypage; (s)% ⊦ mkpeb(buf, m, boolvar).data = buf; (s)% ⊦ m ≤ m; (s)