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From: Michael Meissner <meissner@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/meissner/heads/work164-test)] Make moves from SPRs higher in cost. Date: Thu, 25 Apr 2024 23:39:09 +0000 (GMT) [thread overview] Message-ID: <20240425233909.5A9FE3858D20@sourceware.org> (raw) https://gcc.gnu.org/g:eebc665799dc3cacf8c57f62863b489e07d6066d commit eebc665799dc3cacf8c57f62863b489e07d6066d Author: Michael Meissner <meissner@linux.ibm.com> Date: Thu Apr 25 19:38:52 2024 -0400 Make moves from SPRs higher in cost. 2024-04-25 Michael Meissner <meissner@linux.ibm.com> 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..e5ebbd58cc0 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 = (hard_regno_nregs (LR_REGNO, mode) > 1) ? 32768 : 32; + } + /* 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)))
next reply other threads:[~2024-04-25 23:39 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-25 23:39 Michael Meissner [this message] -- strict thread matches above, loose matches on Subject: below -- 2024-04-25 22:10 Michael Meissner
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