Sam Tebbs b658a2e74a [LV] Reduce register usage for scaled reductions (#133090) ...

This PR accounts for scaled reductions in `calculateRegisterUsage` to
reflect the fact that the number of lanes in their output is smaller
than the VF.

Depends on https://github.com/llvm/llvm-project/pull/126437

2025-04-11 14:31:08 +01:00

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