On Wed, 2 Mar 2022 02:50:27 GMT, Xiaohong Gong <xg...@openjdk.org> wrote:
> The vector `"test"` api is implemented with vector `"compare"`. And the > masked `"test" `is implemented with `"test(op).and(m)"` which means > `"compare().and(m)"` finally. Since the masked vector `"compare"` has been > optimized with predicated instruction for archituctures that support the > feature, the masked `"test"` can also be optimized by implementing it with > the predicated compare. This could save the additional ` "and"` for > architectures that support the predicate feature. > > This patch optimized the masked `"test"` by implementing it with masked > `"compare"`. With this patch, the following codes for the` "IS_NEGATIVE"` op > for a DoubleVector with SVE: > > mov z19.d, #0 > cmpgt p1.d, p7/z, z19.d, z17.d > and p0.b, p7/z, p1.b, p0.b > > are optimized to: > > mov z19.d, #0 > cmpgt p0.d, p0/z, z19.d, z17.d > > Also update the jtreg tests for masked` "test" ` to make sure they are hot > enough to be compiled by c2. This pull request has now been integrated. Changeset: 12693a6c Author: Xiaohong Gong <xg...@openjdk.org> Committer: Ningsheng Jian <nj...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/12693a6cf3e00c38a635d888419406f689657813 Stats: 1325 lines in 70 files changed: 574 ins; 11 del; 740 mod 8282432: Optimize masked "test" Vector API with predicate feature Reviewed-by: psandoz ------------- PR: https://git.openjdk.java.net/jdk/pull/7654
