Clément Verrier ae013beab8 handle empty VECTORIZE in UOp.render() (#13847) ...

`UOp.render()` crashed with `IndexError: tuple index out of range` when
the UOp graph contained a `VECTORIZE` with empty `src=()`. This occurs
when reshaping to scalar shape `()`, e.g., `Tensor.ones(4).sum()`.

The bug was in the renderer's VECTORIZE pattern: `all_same(())` returns
`True` (vacuous truth), causing the code to access `x.src[0]` on an
empty tuple.

- Fix `IndexError` when calling `UOp.render()` on graphs containing
  empty `VECTORIZE` nodes.
- Add test for empty `VECTORIZE` rendering.

2025-12-27 10:09:39 -05:00

31 KiB

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