From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1005) id 2CEDF3858D20; Thu, 25 Apr 2024 22:10:57 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2CEDF3858D20 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1714083057; bh=dMDG+/BcOZ7yLL1wKhM2mNQz50HTY5ZVXHP3fvVFLOQ=; h=From:To:Subject:Date:From; b=gRIIZnD1wQpdKmWaXkTOqdz6u5HQR3RfgVzIQK++Vz5b1OuV8c8LiUMdbTqXqTVZE 61AiSnq+SMhbeGEi3ER91RYVHeWqC6nzlqkUUp9QMJt19DRX8PF5nf4hUqyQ1/S5Vb YXjfHbok+gr3lRmdK36SkiFk5VPKvHOJO747uMvk= 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/work164-test)] Make moves from SPRs higher in cost. X-Act-Checkin: gcc X-Git-Author: Michael Meissner X-Git-Refname: refs/users/meissner/heads/work164-test X-Git-Oldrev: df331a2f871bed812082295bb7afaa3ddd81ea60 X-Git-Newrev: d1a7529aaec43878cc0d0a5e754d894a1857d18a Message-Id: <20240425221057.2CEDF3858D20@sourceware.org> Date: Thu, 25 Apr 2024 22:10:57 +0000 (GMT) List-Id: https://gcc.gnu.org/g:d1a7529aaec43878cc0d0a5e754d894a1857d18a commit d1a7529aaec43878cc0d0a5e754d894a1857d18a Author: Michael Meissner Date: Thu Apr 25 18:10:35 2024 -0400 Make moves from SPRs higher in cost. 2024-04-25 Michael Meissner gcc/ * config/rs6000/rs6000.cc (rs6000_register_move_cost): Make moves from SPRs more expensive. Diff: --- gcc/config/rs6000/rs6000.cc | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 908ad5dcb58..d498f62be7a 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -22813,6 +22813,16 @@ rs6000_register_move_cost (machine_mode mode, ret = 2 * hard_regno_nregs (reg, mode); } + /* Make moves from SPR registers (LR, CTR, TAR) more expensive so that the + register allocator does not think of these registers are useful for saving + results. */ + else if (reg_classes_intersect_p (from, SPECIAL_REGS) + && reg_classes_intersect_p (to, GENERAL_REGS)) + { + rclass = from; + ret = 6; + } + /* Moves from/to GENERAL_REGS. */ else if ((rclass = from, reg_classes_intersect_p (to, GENERAL_REGS)) || (rclass = to, reg_classes_intersect_p (from, GENERAL_REGS)))