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Tue, 22 Dec 2020 15:31:03 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89A9F112069; Tue, 22 Dec 2020 15:31:02 +0000 (GMT) Received: from localhost (unknown [9.160.38.10]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 22 Dec 2020 15:31:02 +0000 (GMT) To: libc-alpha@sourceware.org Subject: [PATCH] powerpc: Add optimized ilogbf128 for POWER9 Date: Tue, 22 Dec 2020 12:30:38 -0300 Message-Id: <20201222153039.17722-1-rzinsly@linux.ibm.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2020-12-22_07:2020-12-21, 2020-12-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=466 phishscore=0 suspectscore=0 impostorscore=0 spamscore=0 mlxscore=0 malwarescore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012220111 X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, GIT_PATCH_0, KAM_NUMSUBJECT, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Raphael Moreira Zinsly via Libc-alpha From: Raphael M Zinsly Reply-To: Raphael Moreira Zinsly Cc: tuliom@linux.ibm.com, Raphael Moreira Zinsly Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" The instruction xsxexpqp introduced on POWER9 extracts the exponent from a quad-precision floating-point, thus it can be used to improve ilogbf128 and llogbf128. --- .../powerpc/powerpc64/le/fpu/e_ilogbf128.c | 22 +++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 sysdeps/powerpc/powerpc64/le/fpu/e_ilogbf128.c diff --git a/sysdeps/powerpc/powerpc64/le/fpu/e_ilogbf128.c b/sysdeps/powerpc/powerpc64/le/fpu/e_ilogbf128.c new file mode 100644 index 0000000000..47558bbadc --- /dev/null +++ b/sysdeps/powerpc/powerpc64/le/fpu/e_ilogbf128.c @@ -0,0 +1,22 @@ +#ifdef _ARCH_PWR9 +int _ilogbf128 (_Float128 __x); + +int +#if defined(_F128_ENABLE_IFUNC) +__ieee754_ilogbf128_power9 (_Float128 __x) +#else +__ieee754_ilogbf128 (_Float128 __x) +#endif +{ + /* Check for exceptional cases. */ + if (!__builtin_vsx_scalar_test_data_class_qp (__x, 0x7f)) + return __builtin_vsx_scalar_extract_expq (__x) - 0x3fff; + else + /* Fallback to the generic ilogb if __x is NaN, Inf or subnormal. */ + return _ilogbf128(__x); +} + +#define __ieee754_ilogbf128 _ilogbf128 +#endif + +#include