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Wed, 6 Dec 2023 05:24:30 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9A77B2004E; Wed, 6 Dec 2023 05:24:30 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8143B20040; Wed, 6 Dec 2023 05:24:29 +0000 (GMT) Received: from genoa.aus.stglabs.ibm.com (unknown [9.40.192.157]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 6 Dec 2023 05:24:29 +0000 (GMT) From: Jiufu Guo To: gcc-patches@gcc.gnu.org Cc: segher@kernel.crashing.org, dje.gcc@gmail.com, linkw@gcc.gnu.org, bergner@linux.ibm.com, guojiufu@linux.ibm.com Subject: [PATCH V3 2/3] Using pli for constant splitting Date: Wed, 6 Dec 2023 13:24:26 +0800 Message-Id: <20231206052427.143889-2-guojiufu@linux.ibm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231206052427.143889-1-guojiufu@linux.ibm.com> References: <20231206052427.143889-1-guojiufu@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: cZRfQdMxqK0aR2cP73Uc968b27VgPvu_ X-Proofpoint-GUID: AMV0hdaF3ztmLjebUDTzWqzotISt0RiE Content-Transfer-Encoding: 8bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-06_04,2023-12-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 mlxlogscore=999 suspectscore=0 spamscore=0 malwarescore=0 clxscore=1011 mlxscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312060043 X-Spam-Status: No, score=-10.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,GIT_PATCH_0,KAM_SHORT,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi, For constant building e.g. r120=0x66666666, which does not fit 'li or lis', 'pli' is used to build this constant via 'emit_move_insn'. While for a complicated constant, e.g. 0x6666666666666666ULL, when using 'rs6000_emit_set_long_const' to split the constant recursively, it fails to use 'pli' to build the half part constant: 0x66666666. 'rs6000_emit_set_long_const' could be updated to use 'pli' to build half part of the constant when necessary. For example: 0x6666666666666666ULL, "pli 3,1717986918; rldimi 3,3,32,0" can be used. Compare with previous: https://gcc.gnu.org/pipermail/gcc-patches/2023-November/636567.html This verion is refreshed and added with a new testcase. Bootstrap®test pass on ppc64{,le}. Is this ok for trunk? BR, Jeff (Jiufu Guo) gcc/ChangeLog: * config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Add code to use pli for 34bit constant. gcc/testsuite/ChangeLog: * gcc.target/powerpc/const_split_pli.c: New test. --- gcc/config/rs6000/rs6000.cc | 7 +++++++ gcc/testsuite/gcc.target/powerpc/const_split_pli.c | 9 +++++++++ 2 files changed, 16 insertions(+) create mode 100644 gcc/testsuite/gcc.target/powerpc/const_split_pli.c diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index dbdc72dce5d..2e074a21a05 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -10509,6 +10509,13 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c, int *num_insns) GEN_INT (0xffffffff))); }; + if (TARGET_PREFIXED && SIGNED_INTEGER_34BIT_P (c)) + { + /* li/lis/pli */ + count_or_emit_insn (dest, GEN_INT (c)); + return; + } + if ((ud4 == 0xffff && ud3 == 0xffff && ud2 == 0xffff && (ud1 & 0x8000)) || (ud4 == 0 && ud3 == 0 && ud2 == 0 && !(ud1 & 0x8000))) { diff --git a/gcc/testsuite/gcc.target/powerpc/const_split_pli.c b/gcc/testsuite/gcc.target/powerpc/const_split_pli.c new file mode 100644 index 00000000000..626c93084aa --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/const_split_pli.c @@ -0,0 +1,9 @@ +/* { dg-do compile { target lp64 } } */ +/* { dg-options "-O2" } */ +/* { dg-require-effective-target power10_ok } */ + +unsigned long long msk66() { return 0x6666666666666666ULL; } + +/* { dg-final { scan-assembler-times {\mpli\M} 1 } } */ +/* { dg-final { scan-assembler-not {\mli\M} } } */ +/* { dg-final { scan-assembler-not {\mlis\M} } } */ -- 2.25.1