From patchwork Mon Nov 4 15:27:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Liebler X-Patchwork-Id: 35624 Received: (qmail 96377 invoked by alias); 4 Nov 2019 15:49:13 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 96365 invoked by uid 89); 4 Nov 2019 15:49:13 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-23.4 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, RCVD_IN_DNSWL_LOW, SPF_PASS autolearn=ham version=3.3.1 spammy=HX-Languages-Length:2430 X-HELO: mx0a-001b2d01.pphosted.com From: Stefan Liebler To: libc-alpha@sourceware.org Cc: Stefan Liebler Subject: [PATCH 16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS. Date: Mon, 4 Nov 2019 16:27:23 +0100 In-Reply-To: <1572881244-6781-1-git-send-email-stli@linux.ibm.com> References: <1572881244-6781-1-git-send-email-stli@linux.ibm.com> x-cbid: 19110415-0012-0000-0000-00000360944A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19110415-0013-0000-0000-0000219BE9D1 Message-Id: <1572881244-6781-16-git-send-email-stli@linux.ibm.com> This patch implements roundtoint and convertoint for s390 by using the load-fp-integer and convert-to-fixed instructions. Both functions are using "round to nearest with ties away from zero" rounding mode and do not raise inexact exceptions. --- sysdeps/s390/fpu/math_private.h | 53 +++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 sysdeps/s390/fpu/math_private.h diff --git a/sysdeps/s390/fpu/math_private.h b/sysdeps/s390/fpu/math_private.h new file mode 100644 index 0000000000..a1ae91a87c --- /dev/null +++ b/sysdeps/s390/fpu/math_private.h @@ -0,0 +1,53 @@ +/* Configure optimized libm functions. S390 version. + Copyright (C) 2019 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef S390_MATH_PRIVATE_H +#define S390_MATH_PRIVATE_H 1 + +#include +#include + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# define TOINT_INTRINSICS 1 + +static inline double_t +roundtoint (double_t x) +{ + double_t y; + /* The z196 zarch "load fp integer" (fidbra) instruction is rounding + x to the nearest integer with ties away from zero (M3-field: 1) + where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ ("fidbra %0,1,%1,4" : "=f" (y) : "f" (x)); + return y; +} + +static inline int32_t +converttoint (double_t x) +{ + int32_t y; + /* The z196 zarch "convert to fixed" (cfdbra) instruction is rounding + x to the nearest integer with ties away from zero (M3-field: 1) + where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ ("cfdbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc"); + return y; +} +#endif + +#include_next + +#endif