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Proof step 1 from proof decode-node (conclusion)

⊦ ⟪decode_node#(n, m, buf; nd; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → abs-node(subarray(buf, n, m), nd) ∧ m = nd.flashsize ∧ n + m ≤ # buf))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ ⟪decode_node#(n, m, buf; nd; err)⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → (∃ buf0, buf1. subarray(buf, n, 2 * NODE_HEADER_SIZE + nd.alignedsize) = buf0 + buf1 + validtrailer ∧ is-encoded(nodeheader(node-size-headerless(nd), false), buf0) ∧ is-encoded(nd, subarray(buf1, 0, node-size-headerless(nd))) ∧ # buf1 = nd.alignedsize) ∧ m = 2 * NODE_HEADER_SIZE + nd.alignedsize ∧ n + 2 * NODE_HEADER_SIZE + nd.alignedsize ≤ # buf))

Rule argument

Additional information

Used simplifier rules: abs-node: ⊦ abs-node(buf, nd) ↔ (∃ buf0, buf1. buf = buf0 + buf1 + validtrailer ∧ is-encoded(nodeheader(node-size-headerless(nd), false), buf0) ∧ is-encoded(nd, subarray(buf1, 0, node-size-headerless(nd))) ∧ # buf1 = nd.alignedsize);% ⊦ nd.flashsize = 2 * NODE_HEADER_SIZE + nd.alignedsize; (s)