On Thu, 13 Nov 2025 21:34:30 GMT, Hamlin Li <[email protected]> wrote:
> Hi, > > This pr add CMoveF/D on riscv, which enable vectorization of statement like: > `op_1 bop op_2 ? res_f_d_1 : res_f_d_2 in a loop`. > > This pr is also a preparation for further vectorization in > https://github.com/openjdk/jdk/pull/28231. > > Previously it's https://github.com/openjdk/jdk/pull/25341, but at that time, > C2 SLP has some issue with unsigned comparison, which is now fixed, so it's > good to continue the work. > > # Test > ## Jtreg > > in progress... > > ## Performance > > Column names meanings: > * p: with patch > * p+v: with patch, `-XX:+UseVectorCmov -XX:+UseCMoveUnconditionally` turned on > * m: without patch > * m+v: without patch, `-XX:+UseVectorCmov -XX:+UseCMoveUnconditionally` > turned on > > #### Average improvement > > NOTE: With only this PR, it brings performance benefit in case of > `CMoveF+CmpF`, `CMoveD+ComD`, `CMoveF+CmpI`, `CMoveD+CmpL`. The data below is > based on fullly implmenting the vectorization of `CMoveI/L/F/D+CmpI/L/F/D`, > which will be achieved by https://github.com/openjdk/jdk/pull/28231. > > For details, check the performance data in > https://github.com/openjdk/jdk/pull/25341 on riscv. > <google-sheets-html-origin style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, > 0); font-style: normal; font-variant-caps: normal; font-weight: 400; > letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; > text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; > -webkit-text-stroke-width: 0px; text-decoration: none;"> > Opt (m/p) | Opt (m+v/p+v) | Opt (p/p+v) | Opt (m/p+v) > -- | -- | -- | -- > 1.022782609 | 2.198717391 | 2.162673913 | 2.199 > > </google-sheets-html-origin> This pull request has now been integrated. Changeset: 6700baa5 Author: Hamlin Li <[email protected]> URL: https://git.openjdk.org/jdk/commit/6700baa5052046f53eb1b04ed3205bbd8e9e9070 Stats: 10199 lines in 15 files changed: 6731 ins; 3270 del; 198 mod 8357551: RISC-V: support CMoveF/D vectorization Reviewed-by: fyang, luhenry ------------- PR: https://git.openjdk.org/jdk/pull/28309
