| commit | 8f5d519458aaf8ca7731ee974b912f6897078282 | [log] [tgz] |
|---|---|---|
| author | Daniil Dudkin <unterumarmung@yandex.ru> | Wed Sep 13 22:18:36 2023 +0000 |
| committer | Diego Caballero <diegocaballero@google.com> | Wed Sep 13 22:49:08 2023 +0000 |
| tree | 54b8ed65c66b57d337defc7def6173a459112f85 | |
| parent | 709b27427b4661bdd08fe80b0164acf53c895793 [diff] |
[mlir][vector] Implement Workaround Lowerings for Masked `fm**imum` Reductions This patch is part of a larger initiative aimed at fixing floating-point `max` and `min` operations in MLIR: https://discourse.llvm.org/t/rfc-fix-floating-point-max-and-min-operations-in-mlir/72671. Within LLVM, there are no masked reduction counterparts for vector reductions such as `fmaximum` and `fminimum`. More information can be found here: https://github.com/llvm/llvm-project/issues/64940#issuecomment-1690694156. To address this issue in MLIR, where we need to generate appropriate lowerings for these cases, we employ regular non-masked intrinsics. However, we modify the input vector using the `arith.select` operation to effectively deactivate undesired elements using a "neutral mask value". The neutral mask value is the smallest possible value for the `fmaximum` reduction and the largest possible value for the `fminimum` reduction. Depends on D158618 Reviewed By: dcaballe Differential Revision: https://reviews.llvm.org/D158773
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