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Arm Fortran Compiler Reference Guide Version 19.1.0 Arm Fortran Compiler Reference Guide Version 19.1.0 Document Number 101380_1910_00 CONTENTS 1 Overview 3 1.1 Arm Fortran Compiler........................................3 1.2 About this book...........................................3 1.3 Getting help.............................................3 2 Get started 5 2.1 Installation..............................................5 2.2 Configuring environment.......................................5 2.3 Compiling and running a simple “Hello World” program......................6 2.4 Generating executable binaries from Fortran code..........................6 2.5 Compiling and linking object files as separate steps.........................6 2.6 Increasing the optimization level...................................6 2.7 Compiling and optimizing using CPU auto-detection........................7 2.8 Compiling Fortran code for SVE-enabled target architectures...................7 2.9 Common compiler options......................................7 2.10 Get support..............................................8 3 Compiler options 9 3.1 Actions................................................9 3.2 File options..............................................9 3.3 Basic driver options......................................... 10 3.4 Optimization options......................................... 10 3.5 Workload compilation options.................................... 12 3.6 Development options......................................... 14 3.7 Warning options........................................... 14 3.8 Pre-processor options........................................ 14 3.9 Linker options............................................ 15 4 Fortran data types and file extensions 17 4.1 Data types.............................................. 17 4.2 Supported file extensions....................................... 18 4.3 Logical variables and constants................................... 19 4.4 C/Fortran inter-language calling................................... 19 4.5 Character............................................... 20 4.6 Complex............................................... 20 4.7 Arm Fortran Compiler Fortran implementation notes........................ 21 5 Fortran statements 23 5.1 Statements.............................................. 23 6 Fortran intrinsics 31 6.1 Overview............................................... 31 6.2 Bit manipulation functions and subroutines............................. 31 6.3 Elemental character and logical functions.............................. 32 6.4 Vector/Matrix functions....................................... 34 i Document number 101380_1910_00 6.5 Array reduction functions...................................... 34 6.6 String construction functions..................................... 37 6.7 Array construction manipulation functions............................. 37 6.8 General inquiry functions...................................... 38 6.9 Numeric inquiry functions...................................... 39 6.10 Array inquiry functions....................................... 40 6.11 Transfer functions.......................................... 40 6.12 Arithmetic functions......................................... 41 6.13 Miscellaneous functions....................................... 44 6.14 Subroutines.............................................. 45 6.15 Fortran 2003 functions........................................ 45 6.16 Fortran 2008 functions........................................ 46 6.17 Unsupported functions........................................ 48 6.18 Unsupported subroutines....................................... 50 7 Directives 53 7.1 ivdep................................................. 53 7.2 vector always............................................. 54 7.3 novector............................................... 55 7.4 omp simd............................................... 56 7.5 unroll................................................. 57 7.6 nounroll................................................ 58 8 Optimization remarks 61 8.1 Optimization remarks........................................ 61 9 Standards support 63 9.1 Fortran 2003............................................. 63 9.2 Fortran 2008............................................. 65 9.3 OpenMP 4.0............................................. 66 9.4 OpenMP 4.5............................................. 67 10 Further resources 69 10.1 Further resources........................................... 69 Document number 101380_1910_00 ii CONTENTS Arm Fortran Compiler Reference Guide Copyright © [2016-2019], Arm Limited (or its affiliates). All rights reserved. Release information Table 1: Document history Issue Date Confidentiality Change 1830_00 20 June 2018 Non-Confidential 18.3.0 1840_00 27 July 2018 Non-Confidential 18.4.0 1900_00 2 November 2018 Non-Confidential 19.0.0 1910_00 8 March 2019 Non-Confidential 19.1.0 Non-Confidential Proprietary Notice This document is protected by copyright and other related rights and the practice or implementation of the information contained in this document may be protected by one or more patents or pending patent applications. No part of this document may be reproduced in any form by any means without the express prior written permission of Arm. No license, express or implied, by estoppel or otherwise to any intellectual property rights is granted by this document unless specifically stated. Your access to the information in this document is conditional upon your acceptance that you will not use or permit others to use the information for the purposes of determining whether implementations infringe any third party patents. THIS DOCUMENT IS PROVIDED “AS IS”. ARM PROVIDES NO REPRESENTATIONS AND NO WAR- RANTIES, EXPRESS, IMPLIED OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY, NON-INFRINGEMENT OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE DOCUMENT. For the avoidance of doubt, Arm makes no representation with respect to, and has undertaken no analysis to identify or understand the scope and content of, third party patents, copyrights, trade secrets, or other rights. This document may include technical inaccuracies or typographical errors. TO THE EXTENT NOT PROHIBITED BY LAW, IN NO EVENT WILL ARM BE LIABLE FOR ANY DAM- AGES, INCLUDING WITHOUT LIMITATION ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNI- TIVE, OR CONSEQUENTIAL DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF ANY USE OF THIS DOCUMENT, EVEN IF Arm HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. This document consists solely of commercial items. You shall be responsible for ensuring that any use, duplication or disclosure of this document complies fully with any relevant export laws and regulations to assure that this document or any portion thereof is not exported, directly or indirectly, in violation of such export laws. Use of the word “partner” in reference to Arm’s customers is not intended to create or refer to any partnership relationship with any other company. Arm may make changes to this document at any time and without notice. If any of the provisions contained in these terms conflict with any of the provisions of any signed written agreement covering this document with Arm, then the signed written agreement prevails over and supersedes the conflicting provisions of these terms. This document may be translated into other languages for convenience, and you agree that if there is any conflict between the English version of this document and any translation, the terms of the English version of the Agreement shall prevail. Words and logos marked with ® or ™ are registered trademarks or trademarks of Arm Limited or its affiliates in the EU and/or elsewhere. All rights reserved. Other brands and names mentioned in this document may be the trademarks of their respective owners. Please follow Arm’s trademark usage guidelines at http://www.arm.com/ about/trademark-usage-guidelines.php Copyright © [2016-2019], Arm Limited (or its affiliates). All rights reserved. Arm Limited. Company 02557590 registered in England. 110 Fulbourn Road, Cambridge, England CB1 9NJ. LES-PRE-20349 Confidentiality Status 1 Document number 101380_1910_00 Arm Fortran Compiler Reference Guide CONTENTS This document is Non-Confidential. The right to use, copy and disclose this document may be subject to license restrictions in accordance with the terms of the agreement entered into by Arm and the party that Arm delivered this document to. Unrestricted Access is an Arm internal classification. Product Status The information in this document is Final, that is for a developed product. Web Address http://www.arm.com Document number 101380_1910_00 2 CHAPTER ONE OVERVIEW Gives an overview of the Arm Fortran Compiler, the information within this book, and provides information on how to get further support. 1.1 Arm Fortran Compiler Arm Fortran Compiler is an auto-vectorizing, Linux user-space Fortran compiler, tailored for High Performance Computing (HPC) and scientific workloads. It is built on the open-source Flang front-end and the LLVM-based optimization and code generation back-end. It supports popular Fortran and OpenMP standards and is tuned for 64-bit Armv8-A architecture. Arm Fortran Compiler is available in combination with Arm C/C++ Compiler, Arm Performance Libraries, Arm Forge, and Arm Performance Reports as part of the Arm Allinea Studio. Arm Allinea Studio is the end-to-end commercial suite for building and porting HPC applications
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