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HP C/aC++ for PA-RISC Software manual +Ofaster, +Onotlscallschangetp, +nosrcpos, +DSmodel

Models: C/aC++ for PA-RISC Software

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Tune to run reasonably well on multiple implementations. As old implementation become less important and new implementations are added, the behavior with this value will change accordingly.

•+FPD

•-Wl,+pi,1M

•-Wl,+pd,1M

•-Wl,+mergeseg

This option is a synonym for -fast.

NOTE: Do not use this option for programs that depend on IEEE standard floating point denormalized numbers. Otherwise, different numerical results may occur. See +Ofltacc=relaxed.

+Ofaster

+Ofaster

The +Ofaster option is equivalent to +Ofast with an increased optimization level. The definition of +Ofaster may change, or the option may be deprecated in future releases.

+O[no]tls_calls_change_tp

+O[no]tls_calls_change_tp

The +O[no]tls_calls_change_tp option specifies whether or not function calls can change the value of the thread pointer(tp), resulting in less aggressive optimizations to TLS variables which are accessed by name.

+[no]srcpos

+[no]srcpos

The +[no]srcpos option controls the generation of source position information for HP Caliper. The default is +srcpos.

When +srcpos, is in effect, the compiler generates source position information. When +nosrcpos is in effect, the compiler does not generate this information and the compiler instructs the linker to discard any of this information found in the object files.

+DSmodel

+DSmodel

The +DSmodel option performs instruction scheduling for a particular implementation of the Itanium®-based architecture. The default is blended.

model any of the values below. blended

itanium	Tune for the Itanium® processor.
itanium2	Tune for the Itanium2® processor.
mckinley	See itanium2® .
montecito	Tune for the Montecito® processor.
poulson	Tune for the Poulson® processor.
native	Tune for the processor on which the compiler is running.

Performance Options 69

Image 69

HP C/aC++ for PA-RISC Software manual +Ofaster, +Onotlscallschangetp, +nosrcpos, +DSmodel

Contents

HP aC++/HP C A.06.28 Programmers Guide Page Contents +FP Contents Contents Contents Initialization and Termination Pragmas Pragma Directives and AttributesCopyright Notice and Identification Pragmas Data Alignment Pragmas Contents Preprocessing Directives 119 Standardizing Your Code 138 Using HP aC++ Templates 132 Exception Handling 161 Optimizing HP aC++ Programs 156 170 Tools and Libraries 175 Mixing C++ with Other Languages 188 Distributing Your C++ Products 195 Migrating from HP C++ cfront to HP aC++ 198Strings 194 Arrays Files in Fortran Glossary 223 Index 227 Documentation feedback 221 Diagnostic Messages 222 HP secure development lifecycle About This Document Intended AudienceWhat’s in This Document This document uses the following conventions Typographical Conventions Related Documents Publishing HistoryHP-UX Release Name and Release Identifier HP-UX 11i Releases Following is a list of documents available with this release HP Encourages Your Comments Components of the Compilation System Getting Started with HP aC++C89 C99 ecom Ctcom Other HP aC++ executable files are Compiling a Simple Program Using the aCC CommandExecuting the Program Debugging Programs Examples of the aCC Command Compiler Command Syntax and Environmental Variables Assembly Language Source Files .s Files Files on the aCC Command Line++ Source File .C file Preprocessed Source Files .i Files Environment Variables Configuration Files .conf FilesObject Files .o Files Library Files .a and .so Files ACCMAXERR Environment Variable ACCFULLPATHNAMES Environment VariableCxxopts Environment Variable Cclibdir Environment Variable ACC -L/mnt/proj/lib file.o ACC file.o Ccrootdir Environment Variable Cxxmapfile Environment Variable Floating InstallationTmpdir Environment Variable Export CCROOTDIR=/mnt/CXX2.1 HP aC++ Setting up Floating Installation Command-Line Options ACC -c sub.C prog.C Options to Control Code GenerationACC +DO11.22 +O3 app.C ILP32 Data Model and LP64 Data Model Compiling in Networked Environments Using +DS to Specify Instruction Scheduling Data Alignment and Storage ACC -S prog.CSize and Alignment of HP Compiler Data Types Fshort-enums Debugging Options+expandtypesindiag ACC +u1 app.C Differences Between -g, -g0, and -g1 Options When to use -g, -g0, and -g1G1 Algorithm +macrodebug +pathtrace +noobjdebug+pathtrace=kind Local None Error Handling+pathtrace=globallocal ACC +p file.C +wn +Wargs+Wcontextlimit +We +wperfadvice+Weargs +Wv Extensions to the Language Exception Handling+wsecurity +noeh +Onofenvaccess Floating-Point Processing Options+Onocxlimitedrange Fpevaldec FpevalNofpwidetypes +decfp +Onolibmerrno +FPmode+Oprefetchlatency +Onopreservedfpregs Header File Options ACC -I include file.C Idirs -I- -Idirs +help Online Help Option +inlinelevel num Inlining Options Dynamic Library OptionsExec Lname Minshared Linker Options+nostl +Onolibcalls= Usymbol Usymbol+Onodynopt +Onodynopt Native Language Support Option Options for Naming the Output File+ild +ildrelink Code Optimizing Options Handling Null Pointers OptionsBasic Optimization Level Options ACC -z file.C +O1 +O0+O2 +O3 +O4 Additional Optimization Options for Finer ControlACC +O3 prog.C +O4 Ipo +nonrv+Onofailsafe +Onoaggressive Advanced +Ooptimization Options+Onolimit +Onoptrstoglobals=list +Onodatalayout +Onocrossregionaddressing+Onodataprefetch +Onofltacc +Onoinitcheck +Ofrequentlycalled +Onoinline +Olit+Ointegeroverflow +Onolooptransform +Olevel+Onoloopunroll +Onoopenmp +Onoparminit +opts+Onoparmsoverlap +Onoprocelim +Orarelycalled +Onosignedpointers+Oshortdata Profile-Based Optimization Options +Otypesafety+Onostoreordering +Ounrollfactor Information Embedding Options Parallel Processing OptionsDisplaying Optimization Information Annotate=structs Required if -DPOSIXCSOURCEis used Option Matrix for -mt +tls=staticdynamic +Onoautopar +wlock Performance OptionsFast +Ofast +Onotlscallschangetp +Ofaster+nosrcpos +DSmodel +sb Porting Options+ub +uc +wdriver +w64bit+wendian This warning can be suppressed by adding an extra cast Preprocessor Options DnameRedirecting Output From This Option +Maked Maked+maked Examples Profiling Code Options Uname+profilebucketsize +check Runtime Checking Options+check=all +check=none Compiling with +check=boundspointer +check=boundsarray +check=boundspointer Check off by any number out-of-bounds access Check off by one out-of-bounds access +check=lock +check=globals +check=malloc +check=thread +check=stackframevariablesnone +check=uninit +check=truncateexplicitimplicitCh = intval & 0xff +check=truncateexplicit +check=truncateimplicit Standards Related Options AarmAarm AC99 AC89Ag++ Agcc AOa and -AOe +legacycpp+legacyv5 +stl=rwnone +std=c89c99c++98c++11gccg++gnu Wc,-ansiforscope,onoff +tru64Wc,-koeniglookup,onoff +tru64 Tx,name Subprocesses of the CompilerMore Examples of -t Tx,name Wx,args Bdefault Symbol Binding OptionsBextern Passing Options to the Linker with -W Bhiddendef BhiddenBprotected Bprotecteddata Template Options +instincludesuffixes Trigraph Processing Suppression Option Verbose Compile and Link Information Process Compiler 94/u 65/s 35/r 37/u 76/s 02/r Concatenating Options ACC -V app.CACC myfile.C -v -g1 ACC myfile.C -vg1 ACC -vg1 myfile.C Initialization and Termination Pragmas Pragma Directives and Attributes Copyright Notice and Identification Pragmas #pragma Versionid string Data Alignment Pragmas#pragma Versionid Software Product, Version 12345.A.01.05 #pragma align N Data Alignment Pragmas Template Example Basic Example Handling Unaligned Data Implicit Access to Unaligned Data Interaction between pack and unalign pragmas is as follows #pragma unalign Typedef T1 T2 Optlevel Pragma Optimization PragmasOptimize Pragma Floattrapson Pragma Noinline Pragma Other Pragmas Diagnostic Pragmas Binding Pragma Defaultbinding PragmaEstimatedfrequency Pragma Extern Pragma Hidden Pragma Hdrstop PragmaHpdefinedexternal Pragma Hpdefinedinternal Pragma Pragma once POP PragmaProtected Pragma Ptrsstronglytyped Pragma Stdc Cxlimitedrange Pragma #pragma Stdc FLOATCONSTDECIMAL64 on OFF DefaultStdc FLOATCONSTDECIMAL64 Pragma Stdc Fpcontract Pragma Stdc Fenvaccess Pragma Unrollfactor PragmaOMP Atomic Pragma OMP Critical Pragma OMP Barrier PragmaOMP for Pragma OMP Flush Pragma OMP Ordered Pragma OMP Master PragmaOMP Parallel Pragma OMP Parallel for Pragma OMP Sections Pragma OMP Parallel Sections PragmaOMP Single Pragma OMP Task Pragma OpenMP Clauses Copyprivate DefaultShared Copyin Attributes Attribute noreturn Attribute nonexposingAttribute nonexposing Attribute noreturn Attribute format Attribute visibilityAttribute warnunusedresult Overview of the Preprocessor Preprocessing DirectivesSyntax Usage Guidelines Syntax Source File Inclusion #include, #includenextDescription Assertions #assert, #unassert #define mac very very long\ Replacement string Macro Replacement #define, #undefExamples Macros with Parameters Concatenating Tokens with the ## Operator Specifying String Literals with the # OperatorExample Following illustrates the ## operator Other Macros Using Macros to Define ConstantsVar1 is #define Arraysize 1000float xARRAYSIZE Using Constants and Inline Functions Instead of Macros Predefined Macros Assertions #assert, #unassert Conditional Compilation #if, #ifdef, .. #endif HP aC++ predefines the following predicatesCode that compiles if the expression evaluates to zero Using the #if Directive Using the defined OperatorUsing the #ifdef and #ifndef Directives Using the #else Directive Line Control #line Example#line 5 myfile Iostream Performance Improvement Pragma This macro enables the following non-standard featuresPragma Directive #pragma and Pragma Operator See page 96 for more information on pragmas Trigraph Sequences Error Directive #errorExamples Line below contains the trigraph sequence ??= ??=line 5 myfile When this line is compiled it becomes Invoking Compile-Time Instantiation Using HP aC++ TemplatesScope and Precedence Template Processing Usage Explicit InstantiationPerformance Template class Tablechar Compile-Time Instantiation Command-Line Option InstantiationFunction Template ACC -c +instcompiletime a.C ACC -c a.C Possible Duplicate Symbols in Shared Libraries Why Use Compile-Time InstantiationPossible Duplicate Symbols in Archive Libraries Scope Class Templates ++ Template TutorialBuilding an Archive Library with +instauto/+instclose Building an Archive Library with Compile-time Instantiation Function Templates HP aC++ Keywords Standardizing Your CodeBool Keyword HP aC++ Keywords Dynamiccast Keyword Compile time error message is Above generates a compile-time error Explicit Keyword Classic example of this problem is an array class Mutable Keyword Connections Across Translation Units Namespace and using Keywords Using Nx // Where N is a namespace, x is a name in N Using- declarations and using- directivesAn Auxiliary Translation Unit IntPage Class Base Virtual void f Must have a virtual function to Volatile Keyword Wchart Keyword Template KeywordTypename Keyword Overloading new and delete for Arrays Use it as the name of the template C belowDeclare a class as a member of the class template C2 below Example Rangeerror Standard Exception ClassesInvalidargument Exceptions Thrown by the Standard C++ Library Typeinfo ClassFollowing exceptions are thrown by the Standard C++ Library Int before const typeinfo& const Unsupported Functionality Memfun1reft Memfunreft Iostream Optimizing HP aC++ Programs Setting Basic Optimization LevelsRequesting Optimization Level 1 Optimization Level 3 Optimization Additional Options for Finer ControlLevel 4 Optimization Enabling Aggressive Optimizations Profile-Based Optimization Removing Compilation Time Limits When OptimizingEnabling Only Conservative Optimizations Limiting the Size of Optimized Code Collecting Data for Profiling InstrumentationMaintaining Profile Data Files Sample.exe input.file1 Sample.exe input.file2 Performing Profile-Based Optimization Pragmas That Control OptimizationACC -o sample.exe +Oprofile=use +O3 sample.C See Optimization Pragmas page 103 for more information Exception Handling in C++ Exception Handling Function Try Block Examples Basic Exception Handling Example Using Locks Using ThreadsDebugging Exception Handling Performance Considerations Rogue Wave Standard C++ Library Rogue Wave Standard C++ Library Required Command-line OptionsRogue Wave Standard C++ Library 1.2.1 and Tools.h++ LpthreadThis option applies only to kernel threads Using -DHPACCTHREADSAFERBTREE Using -DTHREADSAFE with the cfront Compatible libstreamLimitations Cout endl Pthreads Posix Threads Exception HandlingACC -mt prog.c Parallel Programming Using OpenMP Function ScopingOpenMP Implementation OpenMP Header File OpenMP LibraryOpenMP APIs are defined in the library libomp Environment Variables in OpenMP +Onoopenmp Command Line OptionOpenmp Macro Where, kind is either of of static, dynamic, or guided Execution Environment Functions Runtime Library Functions in OpenMPExport OMPDYNAMIC=value Setenv Ompdynamic value Export OMPNESTED=value Setenv Ompnested value Ompgetnumthreads OmpsetnumthreadsOmpgetmaxthreads Ompgetthreadnum Ompsetdynamic Lock FunctionsOmpgetdynamic Ompsetnested Ompdestroylock and ompdestroynestlock Ompinitlock and ompinitnestlockOmpsetlock and ompsetnestlock Ompunsetlock and ompunsetnestlock Omptestlock and omptestnestlock Functions Timing FunctionsOmpgetwtime Ompgetwtick Creating and Using Libraries HP Specific Features of lex and yaccTools and Libraries Locale directive for lex HP aC++ Libraries Introduction to Using the Standard C++ LibraryStandard C++ Library Introduction Non-Object-Oriented Design of the Standard C++ Library Differences between Standard C++ Library and Other Libraries Incompatibilities Between the Library and the Standard Standard C++ Library Reference Tools.h++ Library ACC -DHPACCUSINGMULTIPLIESINFUNCTIONAL test.cHP aC++ Runtime Support Library IOStream Library Linking to C++ Libraries Creating and Using Shared LibrariesLinking with Shared or Archive Libraries Specifying Other Libraries Example of Creating and Using a Shared Library Using a Shared LibraryCreating a Shared Library Linking Archive or Shared Libraries Advanced Shared Library Features Forcing the Export of Symbols in mainUpdating a Shared Library Side Effects of C++ Shared Libraries Binding TimesRoutines and Options to Manage C++ Shared Libraries Linker Options to Manage Shared Libraries Allocation Policies for Containers Standard HP-UX Libraries and Header Files For a string type For -AA Standard Library HP aC++ Executable Files HP aC++ File Locations HP aC++ Runtime Libraries and Header Files Usr/lib/hpux##/libCsup.soUsr/lib/hpux##/libCsup11.so ISO C++11 standard compliant Mixing C++ with Other Languages Calling Other LanguagesData Compatibility between C and C++ HP aC++ Calling HP C Using the extern C Linkage SpecificationSyntax of extern C Examples of extern C Differences in Argument Passing Conventions Main FunctionExamples HP aC++ Calling HP C HP C Calling HP aC++ Running the ExampleEnter the nameJoann Joann has a balance Compiling and Running the Sample Programs To compile the example, run the following commands Calling HP Fortran 90 from HP aC++ Using Reference Variables to Pass ArgumentsFunction Naming Conventions Example of Reference Variables as Arguments Strings Using extern C LinkageArrays Files in Fortran Applications that use HP aC++ Shared Libraries Distributing Your C++ Products Installing your Application Linking Your HP aC++ Libraries with Other LanguagesHP aC++ Files You May Distribute Terms for Distribution of HP aC++ Files General Guidelines for Migration Migrating from HP C++ cfront to HP aC++Getting Started with Migration CC +p cfrontfile.C New Command-Line Options Command-Line DifferencesWriting Code for both Compilers Explicit Loading and Unloading of Shared Libraries Describes obsolete command-line options for HP aC++ Obsolete Command-Line Options Ptv Changed Command-Line Options Migration Considerations when Using Exception Handling Migration Considerations when DebuggingException Handling is the Default See Debugging Options page 35 for complete information Memory Allocation Failure and operator new Possible Differences when Exiting a Signal Handler Calling unexpected Differences in setjmp/longjmp Behavior Throwing an Object having an Ambiguous Base Class Unreachable catch Clauses Standards Based Libraries Migration Considerations when Using Libraries Fstream3C++ iostream and streambuf specialized to files HP C++ cfront Compatibility LibrariesManip3C++ iostream manipulators Man 3s filebuf HP C++ cfront Complex Library Not Supported Migration Considerations Related to PreprocessingHP C++ cfront Task Library Not Supported Replace #include with complex Obsolete Preprocessor Options Migration Considerations Related to StandardizationChanges in C++ Semantics Implicit Typing of Character String Literals Execution Order of Static Constructors in Shared Libraries Overload Resolution Ambiguity of Subscripting Operator Changes in C++ Syntax More Frequent Inlining of Inline CodeExplicit int Declaration Struct as Template Type Parameter is Permitted For Statement, New Scoping RulesEquivalent, valid HP aC++ code follows WC,-ansiforscope,on Base Template Class Reference Syntax Change This code compiles without error with HP aC++Tokens after #endif Overload not a Keyword Dangling Comma in enum Static Member Definition RequiredDeclaring friend Classes Incorrect Syntax for Calls to operator new Using in Class DefinitionsDuplicate Formal Argument Names Ambiguous Function or Object Declaration Reference Initialization Overloaded Operations ++ On HP aC++, the following error is generated Using operator new to Allocate ArraysCompiling this code HP aC++ generates the following error Parentheses in Static Member Initialization List Non-constant Reference Initialization Qualified-id Required in Static Member Initialization List Verbose Template Processing Information Migration Considerations when Using TemplatesDigraph White Space Separators CA a Converting Directed Mode to Explicit Instantiation Common Template Migration Syntax ChangesCfront Implicit Include Convention Documentation feedback Diagnostic Messages AC++ Message CatalogFrequently Encountered Messages Aggressive Glossary International Standard defines only synchronous exceptions See template Glossary Index Symbols Crootdir FLOATTRAPSON, 103 FREQUENTLYCALLED, 106 HDRSTOP, 107 Hidden Index