XL Fortran Enterprise Edition for AIX : User's Guide - IBM

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-qinit Option Syntax -qinit=f90ptr INIT(F90PTR) Makes the initial association status of pointers disassociated. Note that this applies to Fortran 95 as well as Fortran 90, and above. You can use this option to help locate and fix problems that are due to using a pointer before you define it. Related Information See Pointer Association in the XL Fortran Enterprise Edition for AIX Language Reference. 176 XL Fortran Enterprise Edition for AIX : User’s Guide
-qinitauto Option Syntax -qinitauto[=hex_value] | -qnoinitauto Initializes each byte or word (4 bytes) of storage for automatic variables to a specific value, depending on the length of the hex_value. This helps you to locate variables that are referenced before being defined. For example, by using both the -qinitauto option to initialize REAL variables with a NaNS value and the -qflttrap option, it is possible to identify references to uninitialized REAL variables at run time. Prior to XL Fortran Version 5.1.1, you could only use this option to initialize each byte of storage. Setting hex_value to zero ensures that all automatic variables are cleared before being used. Some programs assume that variables are initialized to zero and do not work when they are not. Other programs may work if they are not optimized but fail when they are optimized. Typically, setting all the variables to all zero bytes prevents such run-time errors. It is better to locate the variables that require zeroing and insert code in your program to do so than to rely on this option to do it for you. Using this option will generally zero more things than necessary and may result in slower programs. To locate and fix these errors, set the bytes to a value other than zero, which will consistently reproduce incorrect results. This method is especially valuable in cases where adding debugging statements or loading the program into a symbolic debugger makes the error go away. Setting hex_value to FF (255) gives REAL and COMPLEX variables an initial value of “negative not a number”, or -NaNQ. Any operations on these variables will also result in NaNQ values, making it clear that an uninitialized variable has been used in a calculation. This option can help you to debug programs with uninitialized variables in subprograms; for example, you can use it to initialize REAL variables with a NaNS value. You can initialize 8-byte REAL variables to double-precision NaNS values by specifying an 8-digit hexadecimal number, that, when repeated, has a double-precision NaNS value. For example, you could specify a number such as 7FBFFFFF, that, when stored in a REAL(4) variable, has a single-precision NaNS value. The value 7FF7FFFF, when stored in a REAL(4) variable, has a single-precision NaNQ value. If the same number is stored twice in a REAL(8) variable (7FF7FFFF7FF7FFFF), it has a double-precision NaNS value. Arguments v The hex_value is a 1-digit to 8-digit hexadecimal (0-F) number. v v To initialize each byte of storage to a specific value, specify 1 or 2 digits for the hex_value. If you specify only 1 digit, the compiler pads the hex_value on the left with a zero. To initialize each word of storage to a specific value, specify 3 to 8 digits for the hex_value. If you specify more than 2 but fewer than 8 digits, the compiler pads the hex_value on the left with zeros. v In the case of word initialization, if automatic variables are not a multiple of 4 bytes in length, the hex_value may be truncated on the left to fit. For example, if you specify 5 digits for the hex_value and an automatic variable is only 1 byte long, the compiler truncates the 3 digits on the left-hand side of the hex_value and assigns the two right-hand digits to the variable. XL Fortran Compiler-Option Reference 177
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XL Fortran Enterprise Edition for A
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Note! Before using this information
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Options That Control Listings and M
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How XLF I/O Interacts with Pipes, S
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viii XL Fortran Enterprise Edition
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x XL Fortran Enterprise Edition for
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The following performance-related d
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How to Read the Syntax Diagrams and
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v Optionally, enter the value of at
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6 XL Fortran Enterprise Edition for
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Migration Support The XL Fortran co
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These items are located, or accesse
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v /usr/share/man/info/en_US/xlf/pos
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Notes: 1. Specifying the LC_ALL env
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3. Installing a compiler program te
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fsuffix cppsuffix osuffix ssuffix l
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mcrt = /lib/mcrt0_r.o gcrt = /lib/g
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options include -L/usr/lpp/xlf/lib,
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Related Information: You can use th
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Table 1. Potential Problems Migrati
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Table 1. Potential Problems Migrati
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►► xlf90 xlf90_r xlf90_r7 xlf95
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xlf90, xlf90_r, and xlf90_r7 comman
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Related Information: The ssuffix at
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Related Information: See “-qpdf O
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The @PROCESS compiler directive mus
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Passing Fortran Files through the C
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the trigraph sequence. XL Fortran u
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The configuration file /etc/xlf.cfg
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esulting program work as you expect
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v v Do not use names that are the s
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v v Build the application by using
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If you have applications in which F
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total_usertime Returns the total us
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To obtain support for items that ar
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Note: You may need the old setting
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These partitions are then assigned
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During the busy-wait search for wor
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(for example, loops for which you s
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Other Environment Variables That Af
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Options That Control Input to the C
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Table 3. Options That Control Input
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Table 5. Options for Performance Op
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Table 5. Options for Performance Op
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Table 6. Options for Debugging and
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Table 7. Options That Control Listi
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Table 8. Options for Compatibility
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v v Determine names and options for
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Detailed Descriptions of the XL For
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-1 Option Syntax -1 ONETRIP | NOONE
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-b64 Option Syntax -b64 The AIX ope
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Examples xlf95 f.f -brtl -bshared -
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-bloadmap Option Syntax -bloadmap:n
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-brtl Option Syntax -brtl | -bnortl
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-bstatic Option Related Information
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-c Option Syntax -c Prevents the co
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-d Option Syntax -d Causes preproce
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-g Option Syntax -g DBG | NODBG Gen
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-k Option Syntax -k FREE(F90) Speci
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-l Option Syntax -lkey Searches the
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-O Option Syntax -O[level] OPTimize
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-o Option Syntax -o name Specifies
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-p Option Syntax -p[g] Sets up the
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-q32 Option Related Information See
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-qalias Option Syntax -qalias={[no]
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equivalence (a, b(3)) t = b; a = t
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Page 144 and 145: v v If your primary concern is exec
Page 146 and 147: -qassert Option Syntax -qassert={de
Page 148 and 149: -qautodbl Option Syntax -qautodbl=s
Page 150 and 151: Related Information For background
Page 152 and 153: 2 Level-2 cache or the table lookas
Page 154 and 155: -qcheck Option Syntax -qcheck | -qn
Page 156 and 157: -qcompact Option Syntax -qcompact |
Page 158 and 159: -qctyplss Option Syntax -qctyplss[(
Page 160 and 161: -qdbg Option Syntax -qdbg | -qnodbg
Page 162 and 163: -qdirective Option Syntax -qdirecti
Page 164 and 165: -qdirectstorage Option Syntax -qdir
Page 166 and 167: -qdpc Option Syntax -qdpc[=e] | -qn
Page 168 and 169: -qescape Option Syntax -qescape | -
Page 170 and 171: -qextchk Option Syntax -qextchk | -
Page 172 and 173: -qextname Option Syntax -qextname[=
Page 174 and 175: -qfdpr Option Syntax -qfdpr | -qnof
Page 176 and 177: -qflag Option Syntax -qflag=listing
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Page 182 and 183: -qfree Option Syntax -qfree[={f90|i
Page 184 and 185: -qhalt Option Syntax -qhalt=severit
Page 186 and 187: If you specify -qhot=novector, the
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Page 192 and 193: v You can specify alphabetic digits
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Page 196 and 197: -qipa Option Syntax -qipa[=suboptio
Page 198 and 199: If you specify short, the Object Fi
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Page 202 and 203: -qkeepparm Option Syntax -qkeepparm
Page 204 and 205: Restrictions The -qflag option can
Page 206 and 207: -qlibansi Option Related Informatio
Page 208 and 209: -qlibposix Option Related Informati
Page 210 and 211: -qlistopt Option Syntax -qlistopt |
Page 212 and 213: -qlog4 Option Syntax -qlog4 | -qnol
Page 214 and 215: Restrictions Depending on the sourc
Page 216 and 217: -qmixed Option Syntax -qmixed | -qn
Page 218 and 219: -qmodule Option Syntax -qmodule=man
Page 220 and 221: -qnullterm Option Syntax -qnullterm
Page 222 and 223: -qonetrip Option Syntax -qonetrip |
Page 224 and 225: -qpdf Option Syntax -qpdf{1|2} Tune
Page 226 and 227: mergepdf Generates a single pdf rec
Page 228 and 229: -qphsinfo Option Syntax -qphsinfo |
Page 230 and 231: -qpic Option Syntax -qpic[=suboptio
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Page 236 and 237: -qrealsize Option Syntax -qrealsize
Page 238 and 239: -qrecur Option Syntax -qrecur | -qn
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To produce a listing file that you
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-qsave Option Syntax -qsave[={all|d
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-qsclk Option Syntax -qsclk[=centi
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-qsigtrap Option Syntax -qsigtrap[=
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-qsmp Option Syntax -qsmp[=suboptio
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threshold=n The work in a partition
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xlf90 -qsmp=noopt -O3... is equival
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-qspillsize Option Syntax -qspillsi
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-qstrictieeemod Option Syntax -qstr
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-qsuffix Option Syntax -qsuffix=opt
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Examples @process nullterm i = 1; j
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Related Information See the OpenMP
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-qthreaded Option Syntax -qthreaded
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If you do not specify -qtune, its s
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-qundef Option Syntax -qundef | -qn
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-qunwind Option Syntax -qunwind |-q
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-qwarn64 Option See “-qwarn64 Opt
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-qxflag=xalias Option Syntax -qxfla
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intxor | nointxor Treats .XOR. as a
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Examples Consider the following pro
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In this example, conditional compil
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-qzerosize Option Syntax -qzerosize
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-t Option Syntax -tcomponents Appli
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-u Option Syntax -u UNDEF | NOUNDEF
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-V Option Syntax -V This option is
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$ ./a.out 1 2 3 4 276 XL Fortran En
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-y Option Syntax -y{n | m | p | z}
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64-Bit Thread Support On AIX Versio
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-q64 Option Syntax -q64[=largetype]
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-qwarn64 Option Syntax -qwarn64 | -
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286 XL Fortran Enterprise Edition f
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v v If the data or program code con
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v Comparisons involving NaN values
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How XL Fortran Rounds Floating-Poin
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2. For thread-safety and reentrancy
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v The fltint suboption speeds up fl
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There are other related operating s
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Another method is to use the ieee_s
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call fpgets(fpstat) fpstat(fpox) =
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The following example shows the dif
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v Code that might cause an exceptio
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Optimization levels Option -qnoopt/
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v -qcache=auto Optimization level -
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v v v Reducing the costs of memory
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Loop unrolling also increases code
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2. Run the application using a typi
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# Let the compiler decide (relative
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can also use the SNAPSHOT directive
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-qipa=list cross-file type checking
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Stream-access formatted files: A re
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I/O Redirection The important thing
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Default Record Lengths File Permiss
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XLFRTEOPTS="unit_vars=yes" # Allow
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Logical Volume I/O To use a logical
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READ(unit_number,ID=idvar) a .... W
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450 end do close(20) end Performanc
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Table 22. Table for Binding an Appl
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v The result of an application does
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Sometimes an application can guaran
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v v The XL compilers generate code
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#include template class junk { pri
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Notes: 1. In interlanguage communic
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Table 25. Escape Sequences for Char
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You can use this built-in function
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The system linkage convention passe
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Run-time Stack for 32-bit Environme
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processing, and the fifth doublewor
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v v v v v v v In a 32-bit Environme
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Will Be Passed In: R3 0 Storage Map
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Function Values Functions return th
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Example The control structure has t
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technique can reduce the amount of
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Note: When you run an XL Fortran pr
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Duplicating Extensions from Other S
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Input/Output Errors If the error de
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-> xlf95 -qddim -g testprog.f -o te
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7. The next step is to research why
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Note that you cannot use the -qextn
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v v Memory leak reporting that indi
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HD_FILL HD_STACK=n called a certain
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Source Section The source section c
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Attribute and Cross-Reference Secti
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Automating Large, Complex Compilati
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For fixed source form code, in addi
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Common Industry Extensions That XL
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Example 2 - Valid C Routine Source
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close(10) open(10, file="fun10.out"
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!**********************************
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operating system require the same o
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Examples of Storage Relationships f
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0 4 8 16 32 64 COMPLEX (16) COMPLEX
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! Data values between r8 and x16 ar
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end function sqrt real*8 function r
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Table 34. MASS Vector Library Funct
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IBM may use or distribute any of th
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ind. To relate an identifier to ano
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expression. A sequence of operands,
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name. A lexical token consisting of
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labels can be used to transfer cont
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.profile file 12 .s files 33, 34 .X
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fdate_ service and utility subprogr
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nonested_par suboption of -qsmp 234
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vi text editor 29 W W error severit
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