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Fri, 03 Feb 2023 10:22:15 +0000 Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 313AMCZ245809928 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 3 Feb 2023 10:22:13 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D55152004E; Fri, 3 Feb 2023 10:22:12 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BBFEF20040; Fri, 3 Feb 2023 10:22:11 +0000 (GMT) Received: from pike.rch.stglabs.ibm.com (unknown [9.5.12.127]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 3 Feb 2023 10:22:11 +0000 (GMT) To: gcc-patches@gcc.gnu.org Cc: segher@kernel.crashing.org, dje.gcc@gmail.com, linkw@gcc.gnu.org, guojiufu@linux.ibm.com Subject: [PATCH 2/4] rs6000: build constant via lis;rotldi Date: Fri, 3 Feb 2023 18:22:06 +0800 Message-Id: <20230203102208.53215-3-guojiufu@linux.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230203102208.53215-1-guojiufu@linux.ibm.com> References: <20230203102208.53215-1-guojiufu@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ajCqEQ34oBgbzomCmUuOzFbl0cSKS3yS X-Proofpoint-ORIG-GUID: m2ZNvsSPtclgfPvqSVDClFq-oHYdfmc7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-03_06,2023-02-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 phishscore=0 suspectscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302030088 X-Spam-Status: No, score=-11.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Jiufu Guo via Gcc-patches From: Jiufu Guo Reply-To: Jiufu Guo Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Sender: "Gcc-patches" Hi, This patch checks if a constant is possible to be rotated to/from a negative value from "lis". If so, we could use "lis;rotldi" to build it. The positive value of "lis" does not need to be analyzed. Because if a constant can be rotated from positive value of "lis", it also can be rotated from a positive value of "li". Bootstrap and regtest pass on ppc64{,le}. Is this ok for trunk or next stage1? BR, Jeff (Jiufu) gcc/ChangeLog: * config/rs6000/rs6000.cc (can_be_rotated_to_negative_lis): New function. (can_be_built_by_li_and_rotldi): Rename to ... (can_be_built_by_li_lis_and_rotldi): ... this function. (rs6000_emit_set_long_const): Call can_be_built_by_li_lis_and_rotldi. gcc/testsuite/ChangeLog: * gcc.target/powerpc/const-build.c: Add more tests. --- gcc/config/rs6000/rs6000.cc | 41 ++++++++++++++++--- .../gcc.target/powerpc/const-build.c | 16 +++++++- 2 files changed, 51 insertions(+), 6 deletions(-) diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 82aba051c55..dcbd5820a52 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -10256,18 +10256,49 @@ can_be_rotated_to_negative_li (HOST_WIDE_INT c, int *rot) return can_be_rotated_to_lowbits (~c, 15, rot); } -/* Check if value C can be built by 2 instructions: one is 'li', another is - rotldi. +/* Check if C can be rotated to a negative value which 'lis' instruction is + able to load: 1..1xx0..0. If so, set *ROT to the number by which C is + rotated, and return true. Return false otherwise. */ +static bool +can_be_rotated_to_negative_lis (HOST_WIDE_INT c, int *rot) +{ + /* case a. 1..1xxx0..01..1: up to 15 x's, at least 16 0's. */ + int leading_ones = clz_hwi (~c); + int tailing_ones = ctz_hwi (~c); + int middle_zeros = ctz_hwi (c >> tailing_ones); + if (middle_zeros >= 16 && leading_ones + tailing_ones >= 33) + { + *rot = HOST_BITS_PER_WIDE_INT - tailing_ones; + return true; + } + + /* case b. xx0..01..1xx: some of 15 x's (and some of 16 0's) are + rotated over highest bit. */ + int pos_one = clz_hwi ((c << 16) >> 16); + middle_zeros = ctz_hwi (c >> (HOST_BITS_PER_WIDE_INT - pos_one)); + int middle_ones = clz_hwi (~(c << pos_one)); + if (middle_zeros >= 16 && middle_ones >= 33) + { + *rot = pos_one; + return true; + } + + return false; +} + +/* Check if value C can be built by 2 instructions: one is 'li or lis', + another is rotldi. If so, *SHIFT is set to the shift operand of rotldi(rldicl), and *MASK is set to -1, and return true. Return false otherwise. */ static bool -can_be_built_by_li_and_rotldi (HOST_WIDE_INT c, int *shift, +can_be_built_by_li_lis_and_rotldi (HOST_WIDE_INT c, int *shift, HOST_WIDE_INT *mask) { int n; if (can_be_rotated_to_possitive_li (c, &n) - || can_be_rotated_to_negative_li (c, &n)) + || can_be_rotated_to_negative_li (c, &n) + || can_be_rotated_to_negative_lis (c, &n)) { *mask = HOST_WIDE_INT_M1; *shift = HOST_BITS_PER_WIDE_INT - n; @@ -10316,7 +10347,7 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c) emit_move_insn (dest, gen_rtx_XOR (DImode, temp, GEN_INT ((ud2 ^ 0xffff) << 16))); } - else if (can_be_built_by_li_and_rotldi (c, &shift, &mask)) + else if (can_be_built_by_li_lis_and_rotldi (c, &shift, &mask)) { temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode); unsigned HOST_WIDE_INT imm = (c | ~mask); diff --git a/gcc/testsuite/gcc.target/powerpc/const-build.c b/gcc/testsuite/gcc.target/powerpc/const-build.c index 70f095f6bf2..c38a1dd91f2 100644 --- a/gcc/testsuite/gcc.target/powerpc/const-build.c +++ b/gcc/testsuite/gcc.target/powerpc/const-build.c @@ -34,14 +34,28 @@ li_rotldi_4 (void) return 0x21ffffffffffff94LL; } +long long NOIPA +lis_rotldi_5 (void) +{ + return 0xffff85310000ffffLL; +} + +long long NOIPA +lis_rotldi_6 (void) +{ + return 0x5310000ffffffff8LL; +} + struct fun arr[] = { {li_rotldi_1, 0x7531000000000LL}, {li_rotldi_2, 0x2100000000000064LL}, {li_rotldi_3, 0xffff8531ffffffffLL}, {li_rotldi_4, 0x21ffffffffffff94LL}, + {lis_rotldi_5, 0xffff85310000ffffLL}, + {lis_rotldi_6, 0x5310000ffffffff8LL}, }; -/* { dg-final { scan-assembler-times {\mrotldi\M} 4 } } */ +/* { dg-final { scan-assembler-times {\mrotldi\M} 6 } } */ int main ()