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

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Will Be Passed In: R3 0 Storage Mapping of Parm Area On the Stack in 32-Bit Enviornment |1 R4 4 |2 R5 8 |3 FP1 (R6, R7 unused) 12 16 d1 FP2 (R8 unused) 20 f1 R9 24 c1 right-justified (if language semantics specify) FP3 (R10 unused) 28 32 d2 STACK 36 s1 right-justified (if language semantics specify) FP4 and stack 40 44 cx2 (real) FP5 and stack 48 52 cx2 (imaginary) Figure 4. Storage Mapping of Parm Area On the Stack in 32-Bit Environment Will Be Passed In: R3 R4 R5 FP1 (R6 unused) 0 8 16 24 Storage Mapping of Parm Area on the Stack in 64-Bit Enviornment d1 |1 |2 |3 FP2 (R7 unused) R8 32 40 f1 c1 right-justified (if language semantics specify) FP3 (R9 unused) 48 R10 56 d2 s1 right-justified (if language semantics specify) FP4 and stack 64 cx2 (real) FP5 and stack 72 cx2 (imaginary) Figure 5. Storage Mapping of Parm Area On the Stack in 64-Bit Environment 364 XL Fortran Enterprise Edition for AIX : User’s Guide
Order of Arguments in Argument List The argument list is constructed in the following order. Items in the same bullet appear in the same order as in the procedure declaration, whether or not argument keywords are used in the call. v All addresses or values (or both) of actual arguments 4 v “Present” indicators for optional arguments that are passed by value v Length arguments for strings 4 Linkage Convention for Function Calls A routine has two symbols associated with it: a function descriptor (name) and an entry point (.name). When a call is made to a routine, the program branches to the entry point directly. Excluding the loading of parameters (if any) in the proper registers, compilers expand calls to functions to the following two-instruction sequence: BL .foo # Branch to foo ORI R0,R0,0x0000 # Special NOP The linker does one of two things when it encounters a BL instruction: 1. If foo is imported (not in the same object module), the linker changes the BL to .foo to a BL to .glink (global linkage routine) of foo and inserts the .glink into the object module. Also, if a NOP instruction (ORI R0,R0,0x0000) immediately follows the BL instruction, the linker replaces the NOP instruction with the LOAD instruction L R2, 20(R1). 2. If foo is bound in the same object module as its caller and a LOAD instruction L R2,20(R1) for 32-bit and L R2,40(R1) for 64-bit, or ORI R0,R0,0 immediately follows the BL instruction, the linker replaces the LOAD instruction with a NOP (ORI R0,R0,0). Note: For any export, the linker inserts the procedure’s descriptor into the object module. Pointers to Functions A function pointer is a data type whose values range over procedure names. Variables of this type appear in several programming languages, such as C and Fortran. In Fortran, a dummy argument that appears in an EXTERNAL statement is a function pointer. Fortran provides support for the use of function pointers in contexts such as the target of a call statement or an actual argument of such a statement. A function pointer is a fullword quantity that is the address of a function descriptor. The function descriptor is a 3-word object. The first word contains the address of the entry point of the procedure. The second has the address of the TOC of the object module in which the procedure is bound. The third is the environment pointer for some non-Fortran languages. There is only one function descriptor per entry point. It is bound into the same object module as the function it identifies if the function is external. The descriptor has an external name, which is the same as the function name but with a different storage class that uniquely identifies it. This descriptor name is used in all import or export operations. 4. There may be other items in this list during Fortran-Fortran calls. However, they will not be visible to non-Fortran procedures that follow the calling rules in this section. Interlanguage Calls 365
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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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a derived type are stored with suff
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pwr2s p2sc You can run the executab
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v v If your primary concern is exec
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-qassert Option Syntax -qassert={de
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-qautodbl Option Syntax -qautodbl=s
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Related Information For background
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2 Level-2 cache or the table lookas
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-qcheck Option Syntax -qcheck | -qn
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-qcompact Option Syntax -qcompact |
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-qctyplss Option Syntax -qctyplss[(
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-qdbg Option Syntax -qdbg | -qnodbg
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-qdirective Option Syntax -qdirecti
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-qdirectstorage Option Syntax -qdir
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-qdpc Option Syntax -qdpc[=e] | -qn
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-qescape Option Syntax -qescape | -
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-qextchk Option Syntax -qextchk | -
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-qextname Option Syntax -qextname[=
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-qfdpr Option Syntax -qfdpr | -qnof
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-qflag Option Syntax -qflag=listing
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the reciprocal of the divisor. It a
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export SQRT_EXCEPTION=3.1 166 XL Fo
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-qfree Option Syntax -qfree[={f90|i
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-qhalt Option Syntax -qhalt=severit
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If you specify -qhot=novector, the
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-qhssngl Option Syntax -qhssngl | -
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-qinit Option Syntax -qinit=f90ptr
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v You can specify alphabetic digits
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-qintsize Option Syntax -qintsize=b
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-qipa Option Syntax -qipa[=suboptio
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If you specify short, the Object Fi
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Table 15. Regular expression syntax
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-qkeepparm Option Syntax -qkeepparm
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Restrictions The -qflag option can
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-qlibansi Option Related Informatio
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-qlibposix Option Related Informati
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-qlistopt Option Syntax -qlistopt |
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-qlog4 Option Syntax -qlog4 | -qnol
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Restrictions Depending on the sourc
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-qmixed Option Syntax -qmixed | -qn
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-qmodule Option Syntax -qmodule=man
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-qnullterm Option Syntax -qnullterm
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-qonetrip Option Syntax -qonetrip |
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-qpdf Option Syntax -qpdf{1|2} Tune
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mergepdf Generates a single pdf rec
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-qphsinfo Option Syntax -qphsinfo |
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-qpic Option Syntax -qpic[=suboptio
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sce | nosce } else if (a == 3) *res
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-qprefetch Option Syntax -qprefetch
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-qrealsize Option Syntax -qrealsize
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-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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Page 404 and 405: Source Section The source section c
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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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