Implement RSMs reachability algorithm - #7
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Feb 21, 2026
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Matrix reshape from |V|*|V| to 1*|V*V| triggered 32-bit indexing overflow when V*V > 2^32. The library correctly detects potential overflow (Cj_is_32=false), but the in-place reshape operation (in_place=true) inherits T->j_is_32=true from the original matrix, causing J_work_is_32 to become true and overflow to occur. Solution: use matrix_reshape_dup instead of matrix_reshape to create a new matrix (in_place=false), so J_work_is_32 correctly evaluates to false and 64-bit indexing is used.
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This patch implements a context-free path query algorithm using recursive state machines (RSMs) over edge-labeled directed graphs. It extends the approach of the previously unified regular path search algorithm by using linear algebra operations on adjacency matrices, as presented in https://arxiv.org/abs/2412.10287.