From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1005) id CC8FB3857033; Thu, 14 Jul 2022 15:17:41 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CC8FB3857033 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Michael Meissner To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-8569] [BACKPORT] Disable generating load/store vector pairs for block copies. X-Act-Checkin: gcc X-Git-Author: Michael Meissner X-Git-Refname: refs/heads/releases/gcc-12 X-Git-Oldrev: 0380d008b1474373852fd2fc921886491304f854 X-Git-Newrev: 22736f3d0d4fb8ce4afb3230023f8accdb03a623 Message-Id: <20220714151741.CC8FB3857033@sourceware.org> Date: Thu, 14 Jul 2022 15:17:41 +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: Thu, 14 Jul 2022 15:17:41 -0000 https://gcc.gnu.org/g:22736f3d0d4fb8ce4afb3230023f8accdb03a623 commit r12-8569-g22736f3d0d4fb8ce4afb3230023f8accdb03a623 Author: Michael Meissner Date: Thu Jul 14 11:16:08 2022 -0400 [BACKPORT] Disable generating load/store vector pairs for block copies. Testing has found that using load and store vector pair for block copies can result in a slow down on power10. This patch disables using the vector pair instructions for block copies if we are tuning for power10. 2022-06-11 Michael Meissner gcc/ * config/rs6000/rs6000.cc (rs6000_option_override_internal): Do not generate block copies with vector pair instructions if we are tuning for power10. Back port from master branch. Diff: --- gcc/config/rs6000/rs6000.cc | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 4030864aa1a..040487bd277 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -4151,7 +4151,10 @@ rs6000_option_override_internal (bool global_init_p) if (!(rs6000_isa_flags_explicit & OPTION_MASK_BLOCK_OPS_VECTOR_PAIR)) { - if (TARGET_MMA && TARGET_EFFICIENT_UNALIGNED_VSX) + /* Do not generate lxvp and stxvp on power10 since there are some + performance issues. */ + if (TARGET_MMA && TARGET_EFFICIENT_UNALIGNED_VSX + && rs6000_tune != PROCESSOR_POWER10) rs6000_isa_flags |= OPTION_MASK_BLOCK_OPS_VECTOR_PAIR; else rs6000_isa_flags &= ~OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;