> `Vector::slice` is a method at the top-level class of the Vector API that > concatenates the 2 inputs into an intermediate composite and extracts a > window equal to the size of the inputs into the result. It is used in vector > conversion methods where the part number is not 0 to slice the parts to the > correct positions. Slicing is also used in text processing such as utf8 and > utf16 validation. x86 starting from SSSE3 has `palignr` which does vector > slicing very efficiently. As a result, I think it is beneficial to add a C2 > node for this operation as well as intrinsify `Vector::slice` method. > > A slice is currently implemented as > `v2.rearrange(iota).blend(v1.rearrange(iota), blendMask)` which requires > preparation of the index vector and the blending mask. Even with the > preparations being hoisted out of the loops, microbenchmarks show improvement > using the slice instrinsics. Some have tremendous increases in throughput due > to the limitation that a mask of length 2 cannot currently be intrinsified, > leading to falling back to the Java implementations. > > Please take a look and have some reviews. Thank you very much.
Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision: add comments explaining anonymous classes ------------- Changes: - all: https://git.openjdk.org/jdk/pull/12909/files - new: https://git.openjdk.org/jdk/pull/12909/files/65409f13..c31fdfe8 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=12909&range=02 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12909&range=01-02 Stats: 21 lines in 7 files changed: 21 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/12909.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12909/head:pull/12909 PR: https://git.openjdk.org/jdk/pull/12909
