8f5d519458
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