[mlir][tosa] Optimize non-narrowing float casts (#191439) Extend the existing NonNarrowingCastsOptimization to also cover casts between floating point types f32, f16, bf16, f8E4M3FN and F8E5M2. Avoid introducing direct casts between f8 types since those are not allowed in TOSA. Also expand the set of cases that are considering non-narrowing by only checking if the cast we're trying to remove is non-narrowing. Example i16 -> i32 -> i8 would have been rejected before, but it is now safely converted to a single i16 -> i8 tosa.cast, since the behaviour should identical for the entire input space. Finally disallow the optimization in the case when the cast that we would remove involves integer types of different signedness. Signed-off-by: Ian Tayler Lessa <ian.taylerlessa@arm.com>
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