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Design for flatten_read_indices pass that converts Read ops from N-D logical indices to 1-D physical indices using a LINEAR_INDEX symbol, with expression-keyed bounds for mask preservation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Ivan Butygin <ivan.butygin@gmail.com>
Introduce flatten_read_indices pass that converts Read ops from N-D logical indices to 1-D physical offsets using a LINEAR_INDEX symbol. Handles mapping resolution, shared memory distributed shapes, and expression-keyed bounds via delinearize_index. Skips reads with dynamic mapping values. LIT tests need CHECK pattern updates for the new flat codegen output. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Ivan Butygin <ivan.butygin@gmail.com>
For each Read with LINEAR_INDEX inside a loop body, computes stride = simplify(flat(IV + step) - flat(IV)). When the stride is loop-invariant, rewrites the flat offset to base + IV * stride form. This makes strength reduction trivial for downstream backends. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Ivan Butygin <ivan.butygin@gmail.com>
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