[Arith] Preserve non-divisible nested floormod - #64
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Summary
floormodwhen the inner split can wrap and its extent is not divisible by the outer modulusx % 64 % 7andx % 64 % 8Padding the inner extent cannot justify dropping an active inner modulo because the wrapped expression never produces the padded values.
Related to tile-ai/tilelang#2955.
Testing
cmake --build build -j12pytest tests/python/arith/test_arith_iter_affine_map.py -q— 39 passed