Neville Dipale created ARROW-5303: ------------------------------------- Summary: [Rust] Add SIMD vectorization of numeric casts Key: ARROW-5303 URL: https://issues.apache.org/jira/browse/ARROW-5303 Project: Apache Arrow Issue Type: Improvement Components: Rust Affects Versions: 0.13.0 Reporter: Neville Dipale
To improve the performance of cast kernels, we need SIMD support in numeric casts. An initial exploration shows that we can't trivially add SIMD casts between our Arrow T::Simd types, because `packed_simd` only supports a cast between T::Simd types that have the same number of lanes. This means that adding casts from f64 to i64 (same lane length) satisfies the bound trait `where TO::Simd : packed_simd::FromCast<FROM::Simd>`, but f64 to i32 (different lane length) doesn't. We would benefit from investigating work-arounds to this limitation. Please see [github::nevi_me::arrow/\{branch:simd-cast}/../kernels/cast.rs|[https://github.com/nevi-me/arrow/blob/simd-cast/rust/arrow/src/compute/kernels/cast.rs#L601]] for an example implementation that's limited by the differences in lane length. -- This message was sent by Atlassian JIRA (v7.6.3#76005)