On Fri, 26 Mar 2021 01:50:33 GMT, Xiaohong Gong <xg...@openjdk.org> wrote:
> Currently "VectorMask.andNot()" is not vectorized:
> public VectorMask<E> andNot(VectorMask<E> m) {
> // FIXME: Generate good code here.
> return bOp(m, (i, a, b) -> a && !b);
> }
> This can be implemented with` "and(m.not())" `directly. Since
> `"VectorMask.and()/not()" `have been vectorized in hotspot, `"andNot"`
> can be vectorized as well by calling them.
>
> The performance gain is >100% for such a simple JMH:
> @Benchmark
> public Object andNot(Blackhole bh) {
> boolean[] mask = fm.apply(SPECIES.length());
> boolean[] r = fmt.apply(SPECIES.length());
> VectorMask<Byte> rm = VectorMask.fromArray(SPECIES, r, 0);
>
> for (int ic = 0; ic < INVOC_COUNT; ic++) {
> for (int i = 0; i < mask.length; i += SPECIES.length()) {
> VectorMask<Byte> vmask = VectorMask.fromArray(SPECIES, mask, i);
> rm = rm.andNot(vmask);
> }
> }
> return rm;
> }
This pull request has now been integrated.
Changeset: 7d0a0bad
Author: Xiaohong Gong <xg...@openjdk.org>
Committer: Ningsheng Jian <nj...@openjdk.org>
URL: https://git.openjdk.java.net/jdk/commit/7d0a0bad
Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
8264109: Add vectorized implementation for VectorMask.andNot()
Reviewed-by: psandoz, njian
-------------
PR: https://git.openjdk.java.net/jdk/pull/3211
