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Introduce SignAnalysis, a module pass that infers the sign (signed/unsigned) of integer SSA values via bidirectional dataflow over a four-point lattice. The analysis propagates constraints from sign-carrying operations (sdiv, zext, signed comparisons, nsw/nuw flags), through memory via sea-dsa alias info, and across function boundaries via call/return edges. SmackRep::lit() now queries SignAnalysis to decide constant rendering, falling back to the previous heuristic when the analysis returns Unknown or Conflict. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Introduce SignAnalysis, a module pass that infers the sign (signed/unsigned) of integer SSA values via bidirectional dataflow over a four-point lattice. The analysis propagates constraints from sign-carrying operations (sdiv, zext, signed comparisons, nsw/nuw flags), through memory via sea-dsa alias info, and across function boundaries via call/return edges. SmackRep::lit() now queries SignAnalysis to decide constant rendering, falling back to the previous heuristic when the analysis returns Unknown or Conflict.