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From: Michael Meissner <meissner@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/meissner/heads/dmf004)] Add parameter for memcpy inline code moves Date: Thu, 17 Nov 2022 21:54:50 +0000 (GMT) [thread overview] Message-ID: <20221117215450.6B4EF385223F@sourceware.org> (raw) https://gcc.gnu.org/g:92f5b212e8b335680dddc344a563f4f973389f01 commit 92f5b212e8b335680dddc344a563f4f973389f01 Author: Michael Meissner <meissner@linux.ibm.com> Date: Tue Nov 15 13:54:16 2022 -0500 Add parameter for memcpy inline code moves 2022-11-15 Michael Meissner <meissner@linux.ibm.com> gcc/ * config/rs6000/rs6000.opt (rs6000-memcpy-inline-bytes): New parameter, set to 0. * config/rs6000/rs6000-string.cc (expand_block_move): Only do optimization if rs6000-memcpy-inline-bytes <= 16. Diff: --- gcc/config/rs6000/rs6000-string.cc | 6 ++++-- gcc/config/rs6000/rs6000.opt | 5 +++++ 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/gcc/config/rs6000/rs6000-string.cc b/gcc/config/rs6000/rs6000-string.cc index 2468e375781..243be4f396d 100644 --- a/gcc/config/rs6000/rs6000-string.cc +++ b/gcc/config/rs6000/rs6000-string.cc @@ -2766,7 +2766,9 @@ expand_block_move (rtx operands[], bool might_overlap) if (! constp) { if (TARGET_BLOCK_OPS_UNALIGNED_VSX && TARGET_P9_VECTOR && TARGET_64BIT - && !optimize_size) + && rs6000_memcpy_inline_bytes > 0 + && rs6000_memcpy_inline_bytes <= GET_MODE_SIZE (V16QImode) + && optimize && !optimize_size) { rtx join_label = gen_label_rtx (); rtx inline_label = gen_label_rtx (); @@ -2779,7 +2781,7 @@ expand_block_move (rtx operands[], bool might_overlap) : convert_to_mode (Pmode, bytes_rtx, true)); rtx cr = gen_reg_rtx (CCUNSmode); - rtx max_size = GEN_INT (16); + rtx max_size = GEN_INT (rs6000_memcpy_inline_bytes); emit_insn (gen_rtx_SET (cr, gen_rtx_COMPARE (CCUNSmode, bytes_rtx, max_size))); diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt index 6872d359952..90dc91a277f 100644 --- a/gcc/config/rs6000/rs6000.opt +++ b/gcc/config/rs6000/rs6000.opt @@ -687,3 +687,8 @@ default value is 4. Target Undocumented Joined UInteger Var(rs6000_vect_unroll_reduc_threshold) Init(1) Param When reduction factor computed for a loop exceeds the threshold specified by this parameter, prefer to unroll this loop. The default value is 1. + +-param=rs6000-memcpy-inline-bytes= +Target Undocumented Joined UInteger Var(rs6000_memcpy_inline_bytes) Init(0) Param +Maximum number of bytes to move with inline code before calling the memcpy +library function. The default value is 0.
next reply other threads:[~2022-11-17 21:54 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-17 21:54 Michael Meissner [this message] -- strict thread matches above, loose matches on Subject: below -- 2022-11-17 21:54 Michael Meissner 2022-11-15 18:54 Michael Meissner 2022-11-15 17:27 Michael Meissner
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