From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1005) id F08333858401; Wed, 23 Mar 2022 05:21:26 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F08333858401 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Michael Meissner To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/meissner/heads/work082)] Update ChangeLog.meissner. X-Act-Checkin: gcc X-Git-Author: Michael Meissner X-Git-Refname: refs/users/meissner/heads/work082 X-Git-Oldrev: c54dd224dca2ed303968abaf3e7a619dfa6c8743 X-Git-Newrev: 4e9c51e9364bfc88b05b9d0808dfc9bfdff3cc55 Message-Id: <20220323052126.F08333858401@sourceware.org> Date: Wed, 23 Mar 2022 05:21:26 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Mar 2022 05:21:27 -0000 https://gcc.gnu.org/g:4e9c51e9364bfc88b05b9d0808dfc9bfdff3cc55 commit 4e9c51e9364bfc88b05b9d0808dfc9bfdff3cc55 Author: Michael Meissner Date: Wed Mar 23 01:21:07 2022 -0400 Update ChangeLog.meissner. 2022-03-23 Michael Meissner gcc/ * ChangeLog.meissner: Update. Diff: --- gcc/ChangeLog.meissner | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/gcc/ChangeLog.meissner b/gcc/ChangeLog.meissner index 53691a0dc53..37ced301982 100644 --- a/gcc/ChangeLog.meissner +++ b/gcc/ChangeLog.meissner @@ -1,3 +1,52 @@ +==================== Work082, patch #6: +Optimize vec_splats of constant vec_extract for V2DI/V2DF. + +In PR target/99293, it was pointed out that doing: + + vector long long dest0, dest1, src; + /* ... */ + dest0 = vec_splats (vec_extract (src, 0)); + dest1 = vec_splats (vec_extract (src, 1)); + +would generate slower code. + +It generates the following code on power8: + + ;; vec_splats (vec_extract (src, 0)) + xxpermdi 0,34,34,3 + xxpermdi 34,0,0,0 + + ;; vec_splats (vec_extract (src, 1)) + xxlor 0,34,34 + xxpermdi 34,0,0,0 + +However on power9 and power10 it generates: + + ;; vec_splats (vec_extract (src, 0)) + mfvsld 3,34 + mtvsrdd 34,9,9 + + ;; vec_splats (vec_extract (src, 1)) + mfvsrd 9,34 + mtvsrdd 34,9,9 + +This is due to the power9 having the mfvsrld instruction which can extract +either 64-bit element into a GPR. + +However in this case, it is better to have a single combiner pattern that +can generate a single xxpermdi, instead of 2 insnsn. + +2022-03-23 Michael Meissner + +gcc/ + PR target/99392 + * config/rs6000/vsx.md (vsx_splat_const_extract_): New + insn. + +gcc/testsuite: + PR target/99392 + * gcc.target/powerpc/pr99293.c: New test. + ==================== Work082, patch #5: Generate vadduqm and vsubuqm for TImode add/subtract