Compilers: IBM XL C/C++ Enterprise Edition Version 8.0 for AIX
Compilers: IBM XL Fortran Enterprise Edition Version 10.1 for AIX
Compilers: IBM XL C/C++ Enterprise Edition Version 9.0 for AIX
Compilers: IBM XL Fortran Enterprise Edition Version 11.1 for AIX
Compilers: IBM XL C/C++ Version 10.1 for AIX
Compilers: IBM XL Fortran Version 12.1 for AIX
Last updated: 13-Apr-2009
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Perform optimizations for maximum performance. This includes maximum interprocedural analysis on all of the objects presented on the "link" step. This level of optimization will increase the compiler's memory usage and compile time requirements. -O5 Provides all of the functionality of the -O4 option, but also provides the functionality of the -qipa=level=2 option.-O5 is equivalent to the following flags
Perform optimizations for maximum performance. This includes interprocedural analysis on all of the objects presented on the "link" step.-O4 is equivalent to the following flags
Produces object code containing instructions that will run on the specified processors. "auto" selects the processor the compile is being done on. "pwr5x" is the POWER5+ processor.
Supported values for this flag are
Specifies the system architecture for which the executable program is optimized. This includes instruction scheduling and cache setting.
The supported values for suboption are
This option specifies that no functions are to be inlined.
This option inlines glue code that optimizes external function calls when compiling.
Performs high-order transformations on loops during optimization. The supported values for suboption are:
Specifying -qhot without suboptions implies -qhot=nosimd, -qhot=noarraypad, -qhot=vector and -qhot=level=1. The -qhot option is also implied by -O4, and -O5.
Enhances optimization by doing detailed analysis across procedures (interprocedural analysis or IPA). The level determines the amount of interprocedural analysis and optimization that is performed.
level=0 Does only minimal interprocedural analysis and optimization
level=1 turns on inlining , limited alias analysis, and limited call-site tailoring
level=2 turns on full interprocedural data flow and alias analysis
Suppresses interprocedural analysis (IPA), which is enabled by default at optimization levels -O4 and -O5.
The option used in the first pass of a profile directed feedback compile that causes pdf information to be generated. The profile directed feedback optimization gathers data on both execution path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.
The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.
The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.
-qxlf90=<suboption> Determines whether the compiler provides the Fortran 90 or the Fortran 95 level of support for certain aspects of the language. <suboption> can be one of the following: signedzero | nosignedzero Determines how the SIGN(A,B) function handles signed real 0.0. In addition, determines whether negative internal values will be prefixed with a minus when formatted output would produce a negative sign zero. autodealloc | noautodealloc Determines whether the compiler deallocates allocatable arrays that are declared locally without either the SAVE or the STATIC attribute and have a status of currently allocated when the subprogram terminates. oldpad | nooldpad When the PAD=specifier is present in the INQUIRE statement, specifying -qxlf90=nooldpad returns UNDEFINED when there is no connection, or when the connection is for unformatted I/O. This behavior conforms with the Fortran 95 standard and above. Specifying -qxlf90=oldpad preserves the Fortran 90 behavior. Default: o signedzero, autodealloc and nooldpad for the xlf95, xlf95_r, xlf95_r7 and f95 invocation commands. o nosignedzero, noautodealloc and oldpad for all other invocation commands.
Generates 64 bit ABI binaries. The default is to generate 32 bit ABI binaries.
Indicates that a program, designed to execute in a large page memory environment, can take advantage of large 16 MB pages provided on POWER4 and higher based systems.
Indicates that the compiler understands how to do alloca().
Causes the Fortran compiler to allocate dynamic arrays on the heap instead of the stack
Specifies that all local variables be treated as STATIC.
Enables the generation of vector instructions for processors that support them.
Specifies whether to use volatile or non-volatile vector registers. Volatile vector registers are registers whose value is not preserved across function calls so the compiler will not depend on values in them across function calls.
Link the mathematical acceleration subsystem libraries (MASS), which contain libraries of tuned mathematical intrinsic functions.
Link the Engineering and Scientific Subroutine Library (ESSL).
Specifies that, if either -lessl or -lesslsmp are also specified, then Engineering and Scientific Subroutine Library (ESSL) routines should be used in place of some Fortran 90 intrinsic procedures when there is a safe opportunity to do so.
Cause the C++ compiler to generate Run Time Type Identification code
qalias=ansi | noansi If ansi is specified, type-based aliasing is used during optimization, which restricts the lvalues that can be safely used to access a data object. The default is ansi for the xlc, xlC, and c89 commands. This option has no effect unless you also specify the -O option. qalias=std |nostd Indicates whether the compilation units contain any non-standard aliasing (see Compiler Reference for more information). If so, specify nostd.
Specifies what aggregate alignment rules the compiler uses for file compilation, where the alignment options are: bit_packed The compiler uses the bit_packed alignment rules. full The compiler uses the RISC System/6000 alignment rules. This is the same as power. mac68k The compiler uses the Macintosh alignment rules. This suboption is valid only for 32- bit compilations. natural The compiler maps structure members to their natural boundaries. packed The compiler uses the packed alignment rules. power The compiler uses the RISC System/6000 alignment rules. twobyte The compiler uses the Macintosh alignment rules. This suboption is valid only for 32- bit compilations. The mac68k option is the same as twobyte. The default is -qalign=full.
Causes the compiler to automatically generate parallel code using OMP controls when possible.
Tell the compiler that OMP controls are used to identify parallel code.
Ensures that optimizations done by default at optimization levels -O3 and higher, and, optionally at -O2, do not alter the semantics of a program. The -qstrict=all, -qstrict=precision, -qstrict=exceptions, -qstrict=ieeefp, and -qstrict=order suboptions and their negative forms are group suboptions that affect multiple, individual suboptions. Group suboptions act as if either the positive or the no form of every suboption of the group is specified. Default: o Always -qstrict or -qstrict=all when the -qnoopt or -O0 optimization level is in effect o -qstrict or -qstrict=all is the default when the -O2 or -O optimization level is in effect o -qnostrict or -qstrict=none is the default when -O3 or a higher optimization level is in effect <suboptions_list> is a colon-separated list of one or more of the following: all | none all disables all semantics-changing transformations, including those controlled by the ieeefp, order, library, precision, and exceptions suboptions. none enables these transformations. precision | noprecision precision disables all transformations that are likely to affect floating-point precision, including those controlled by the subnormals, operationprecision, association, reductionorder, and library suboptions. noprecision enables these transformations. exceptions | noexceptions exceptions disables all transformations likely to affect exceptions or be affected by them, including those controlled by the nans, infinities, subnormals, guards, and library suboptions. noexceptions enables these transformations. ieeefp | noieeefp ieeefp disables transformations that affect IEEE floating-point compliance, including those controlled by the nans, infinities, subnormals, zerosigns, and operationprecision suboptions. noieeefp enables these transformations. nans | nonans nans disables transformations that may produce incorrect results in the presence of, or that may incorrectly produce IEEE floating-point signaling NaN (not-a-number) values. nonans enables these transformations. infinities | noinfinities infinities disables transformations that may produce incorrect results in the presence of, or that may incorrectly produce floating-point infinities. noinfinities enables these transformations. subnormals | nosubnormals subnormals disables transformations that may produce incorrect results in the presence of, or that may incorrectly produce IEEE floating-point subnormals (formerly known as denorms). nosubnormals enables these transformations. zerosigns | nozerosigns zerosigns disables transformations that may affect or be affected by whether the sign of a floating-point zero is correct. nozerosigns enables these transformations. operationprecision | nooperationprecision operationprecision disables transformations that produce approximate results for individual floating-point operations. nooperationprecision enables these transformations. order | noorder order disables all code reordering between multiple operations that may affect results or exceptions, including those controlled by the association, reductionorder, and guards suboptions. noorder enables code reordering. association | noassociation association disables reordering operations within an expression. noassociation enables reordering operations. reductionorder | noreductionorder reductionorder disables parallelizing floating-point reductions. noreductionorder enables these reductions. guards | noguards guards disables moving operations past guards or calls which control whether the operation should be executed or not. enables these moving operations. library | nolibrary library disables transformations that affect floating-point library functions. nolibrary enables these transformations.
Causes the compiler to treat "char" variables as signed instead of the default of unsigned.
Indicates that the input fortran source program is in fixed form.
Adds an underscore to global entities to match the C compiler ABI
Permits the usage of "//" to introduce a comment that lasts until the end of the current source line, as in C++.
Invoke the IBM XL C compiler. 32-bit binaries are produced by default.
Invoke the IBM XL C++ compiler. 32-bit binaries are produced by default.
Invoke the IBM XL Fortran compiler. 32-bit binaries are produced by default.
Allows most any c dialect.
Specifies whether to include standard object code in the object files. The noobject suboption can substantially reduce overall compilation time, by not generating object code during the first IPA phase. This option does not affect the code in the final binary created.
The threads suboption allows the IPA optimizer to run portions of the optimization process in parallel threads, which can speed up the compilation process on multi-processor systems. All the available threads, or the number specified by N, may be used. N must be a positive integer. Specifying nothreads does not run any parallel threads; this is equivalent to running one serial thread. This option does not affect the code in the final binary created.
Specifies the size of the compiler's internal program storage areas, in bytes.
Causes the compiler to output a traceback if it abends.
Suppresses the message with the message number specified.
Suppresses informational, language-level, and warning messages. This option sets -qflag=e:e.
The fdpr command (Feedback Directed Program Restructuring) is a performance-tuning utility that may help improve the execution time and the real memory utilization of user-level application programs. The fdpr program optimizes the executable image of a program by collecting information on the behavior of the program while the program is used for some typical workload, and then creating a new version of the program that is optimized for that workload. The new program generated by fdpr typically runs faster and uses less real memory. Usage: fdpr [options] -p program [-x invocation] where -p specifies the input program, in a form of executable, shared object or archive file -x specifies how to invoke the program [options] can be one or more of the following: Action Options: -123 Specifies which actions/phases to run, where: -1 generates instrumented program for profile gathering -2 runs the instrumented program and updates profile data (requires -x <invocation>) -3 generates optimized program Default is set to run all three phases (-123) -a/--action [action] Specifies customized actions where [action] can be one of the following: anl analyze program instr generate instrumented program for profile gathering (same as -1) opt generate optimized program (same as -3) check_sign check fdpr signature in the input program Analysis Options: -aawc/-noaawc, --analyze-assembly-written-csects/--noanalyze-assembly-written-csects Analyze/Do not analyze objects written in Assembly. The default is set to analyze modules written in Assembly -acf <analysis configuration file>, --analysis-configuration-file <analysis configuration file> Provide a configuration file of analysis information (advanced option) -asd, --analyze-static-data Analyze static data objects as distinct data elements for data reordering (unsafe for certain compilers) -esa, --extra-safe-analysis Limit analysis phase to compiler generated code -fca, --funcsect-analysis Apply special analysis for an input executable that was compiled with the -qfuncsect compiler option -ff <string>, --file-format <string> Input file format: can be LM (load module) or PO (program object) -ifl <file>, --ignored-function-list <file> Set the ignored function list. The file contains names of functions that should not be instrumentated or optimized -iinf, --ignore-info Ignore .info sections produced with the -qfdpr option during compile time Instrumentation Options: -anl, --analyze-program Analyze the program but does not create any modified binary. This option is used to provide dump of profile/code coverage information. When used with the -d option it will dump the disassembly of the original program -ccf <coverage_file>, --code-coverage-file <coverage_file> Use file mapped to shared memory to collect coverage information at run-time -ccgi <mode>, --code-coverage-generate-info <mode> Produce coverage information to given file based on profile information. Use <mode>=XML for XML output and <mode>=FLAT for flat formatted text file. The generated file is <output file>.cci[.xml] -cci, --code-coverage-instrumentation Instrument program in order to obtain code coverage information. program must be compiled with line number debug info -ccl <level>, --code-coverage-level <level> Perform Code Coverage at Basic Block level (BB) or at functions level (Func). default is BB -ccm <coverage_map>, --code-coverage-map <coverage_map> Defines the map file name of coverage instrumentation. Default is <output file>.cc -ei, --embedded-instrumentation Perform embedded instrumentation. The profile will be collected into global variables -fd <Fdesc>, --file-descriptor <Fdesc> Set the file descriptor number to be used when opening the profile file. The default of <Fdesc> is set to the maximum-allowed number of open files -imullX, --mullX-instrumentation perform value profiling of RA and RB operands in mullX instructions -infp, --ignore-not-found-procedures Ignore not found procedures -ipcr/-noipcr, --instrumentation-preserve-condition-register/--noinstrumentation-preserve-condition-register Preserve/Do not preserve Condition Register while calling stubs -ipctr/-noipctr, --instrumentation-preserve-count-register/--noinstrumentation-preserve-count-register Preserve/Do not preserve Count Register while calling stubs -ipe/-noipe, --instrumentation-preserve-environment/--noinstrumentation-preserve-environment Do not preserve registers that are not overwritten while calling stubs. -noipe implies -noipvr -noipspr -iplr/-noiplr, --instrumentation-preserve-link-register/--noinstrumentation-preserve-link-register Preserve/Do not preserve link register while calling stubs -ipnvr, --instrumentation-preserve-non-volatile-registers Preserve non volatile registers while calling stubs -ipspr/-noipspr, --instrumentation-preserve-special-registers/--noinstrumentation-preserve-special-registers Preserve/Do not preserve special purpose registers while calling stubs -ipvr/-noipvr, --instrumentation-preserve-volatile-registers/--noinstrumentation-preserve-volatile-registers Preserve/Do not preserve volatile registers while calling stubs. -noipvr implies -noipnvr and -nosfp -ipxer/-noipxer, --instrumentation-preserve-fixed-point-exception-register/--noinstrumentation-preserve-fixed-point-exception-register Preserve/Do not preserve Fixed-Point Exception Register while calling stubs -issu, --instrumentation-safe-stack-usage Ensure additional stack space is properly allocated for the instrumented run. Use this option if your application uses stack extensively (e.g., when the program uses alloca()). Note that this option adds extra overhead on instrumentation code -iso <offset>, --instrumentation-stack-offset <offset> Set the offset from the stack, a negative number, where the instrumentation's area for saving registers is kept at runtime. Use with care -M <addr>, --profile-map <addr> Set shared memory segment address for profiling. Alternative shared memory addresses are needed when the instrumented program application creates a conflict with the shared-memory addresses preserved for the profiling. Typical alternative values are 0x40000000, 0x50000000, ... up to 0xC0000000. The default is set to 0x3000000 -pi, --profile-instrumentation Instrument program in order to obtain execution count profile -ri/-nori, --register-instrumentation/--noregister-instrumentation Instrument/Do not instrument the input program file to collect profile information about indirect branches via registers. The default is set to collect the profile information -sfp/-nosfp, --save-floating-point-registers/--nosave-floating-point-registers Save/Do not save floating point registers in instrumented code. The default is set to save floating point registers -spescr <0-127>, --spe-scratch-register <0-127> Specify a global SPE scratch register, decreasing instrumenation overhead, in order to minimize possibility of local store overflow -ui, --user-instrumentation Instrument program by insert calls to user supplied functions compiled into shared library Profile Files Options: -af <prof_file>, --ascii-profile-file <prof_file> Set the name of an ASCII profile file containing profile information. There are three different XML entry options: <Simple .. >, <Cond .. > and <Reg .. > for profiling data on regular, conditional or branch via register instructions, respectively -aop, --accept-old-profile Accept the old profile file collected on previous versions of the input program file (requires the -f flag) -f <prof_file>, --profile-file <prof_file> Set the profile file name. The profile file is created during the instrumentation phase and read during the optimization phase. The profile file is updated each time you run the instrumented program Optimization Options: -A <alignment>, --align-code <alignment> Align program so that hot code will be aligned on <alignment>-byte addresses -abb <factor>, --align-basic-blocks <factor> Align basic blocks that are hotter than the average by a given (float) <factor>. This is a lower-level machine-specific alignment compared to --align-code. Value of -1 (the default) disables this option -bh <factor>, --branch-hint <factor> add branch hints to basic blocks that are hotter then the average by given (float) <factor>. This is a SPE specific optimization. Value of -1 (the default) disables this option -bldcg, --build-dcg Build a Data Connectivity Graph (DCG) for enhanced data reordering (applicable only with the -RD flag) -btcar, --branch-table-csect-anchor-removal Eliminate load instructions used when accessing branch tables -cbtd, --convert-bss-to-data Convert BSS section into a data section. This is useful for more aggressive tocload and RD optimizations -cib-opt, --convert-indirect-branches-optimization Convert indirect branch to direct branch -cRD, --conservativeRD Perform conservative static data reordering by packing together all frequently referenced static variables -dce, --dead-code-elimination Eliminate instructions related to unused local variables within frequently executed functions. This is useful mainly after applying function inlining optimization -dp, --data-prefetch Insert data-cache prefetch instructions to improve data-cache performance -dpht <threshold>, --data-placement-hotness-threshold <threshold> Set data placement algorithm hotness threshold between (0,1), where 0 reorders the static variables in large groups based on the control flow, and 1 reorders the variables in very small groups based on their access frequency. (This is applicable only with the -RD flag) -dpnf <factor>, --data-placement-normalization-factor <factor> Set data placement algorithm normalization factor between (0,1), where 0 causes static variables to be reordered regardless of their size, and 1 locates only small sized variables first. (applicable only with the -RD flag) -ece, --epilog-code-eliminate Reduce code size by grouping common instructions in function epilogs, into a single unified code -fc, --function-cloning Enable function cloning phase only during function inlining optimizations (applicable only with function inlining flags: -i, -si, -ihf, -isf, -shci) -hr, --hco-reschedule Relocate instructions from frequently executed code to rarely executed code areas, when possible -hrf <factor>, --hco-resched-factor <factor> Set the aggressiveness of the -hr optimization option according to a factor value between (0,1), where 0 is the least aggressive factor (applicable only with the -hr option) -i, --inline Same as --selective-inline with --inline-small-funcs 12 -icm-opt, --icm-optimization Replace a sequence of l/ltr or ly/ltr instructions with and icm or icmy instruction respectively -ihf <pct>, --inline-hot-functions <pct> Inline all function call sites to functions that have a frequency count greater than the given <pct> frequency percentage -iplte, --inline-plt-entries Replaces the call to a PLT entry with the PLT entry code itself, by inlining the first part of the entry -isf <size>, --inline-small-funcs <size> Inline all functions that are smaller than or equal to the given <size> in bytes -kr, --killed-registers Eliminate stores and restores of registers that are killed (overwritten) after frequently executed function calls -lal-opt, --load-after-load-optimization Replace two load instruction from the same memory location to one load instruction and one placement instruction -lap, --load-address-propagation Eliminate load instructions of variable addresses by re-using pre-loaded addresses of adjacent variables -larl-opt, --larl-optimization Replace a sequence of bras/const area/llgt instructions with a single lalr instruction -las, --load-after-store Add NOP instructions to place each load instruction further apart following a store instruction that references the same memory address -ldce, --local-dead-code-optimization Local dead code elimination (basic block scope only) - needless when using -dce -ldp-opt, --long-displacement-optimization Replace an instruction which has long displacement with the matching insturction which has short displacement, according to the displacement operand (e.g. ay-->a, oy-->o, xy-->x, etc.) -lgfr-opt, --lgfr-optimization Replace when can a 32 bit instruction with its matching 64 bit instruction -llgh-opt, --llgh-optimization Replace a sequence of lh/nilh/llgfr instructions with a single llgh instruction -lro, --link-register-optimization Eliminate saves and restores of the link register in frequently-executed functions -lu <aggressiveness_factor>, --loop-unroll <aggressiveness_factor> Unroll short loops containing one to several basic blocks according to an aggressiveness factor between (1,9), where 1 is the least aggressive unrolling option for very hot and short loops -lun <unrolling_number>, --loop-unrolling-number <unrolling_number> Set the number of unrolled iterations in each unrolled loop. The allowed range is between (2,50). Default is set to 2. (Applicable only with the -lu flag) -mvc-opt, --mvc-optimization Replace an mvc instruction with lg/stg instructions -nillr15-opt, --nillr15-optimization Remove a nill r15,0xfffe instruction if followed by an stmg r14,r12,8(r13) instruction -O Switch on basic optimizations only. Same as -RC -nop -bp -bf -O2 Switch on less aggressive optimization flags. Same as -O -hr -pto -isf 8 -tlo -kr -O3 Switch on aggressive optimization flags. Same as -O2 -RD -isf 12 -si -dp -lro -las -vro -btcar -lu 9 -rt 0 -so -O4 Switch on aggressive optimization flags together with aggressive function inlining. Same as -O3 -sidf 50 -ihf 20 -sdp 9 -shci 90 and -bldcg (for XCOFF files) -O5 Switch on aggressive optimization flags together with HLR optimization. Same as -O4 -sa -gcpyp -gcnstp -dce -vrox -omullX, --mullX-optimization Optimize mullX instructions by adding a run-time check on RA and RB and performing equivalent operations with lower penalty. The optimization requires the use of -imullX in the instrumentation phase -pbsi, --path-based-selective-inline Perform selective inlining of dominant hot function calls based on the control flow paths leading to hot functions -pc, --preserve-csects Preserve CSects' boundaries in reordered code -pca, --propagate-constant-area Relocate the constant variables area to the top of the code section when possible -pfb, --preserve-first-bb Preserve original location of the entry point basic block in program -pp, --preserve-functions Preserve functions' boundaries in reordered code -pr/-nopr, --ptrgl-r11/--noptrgl-r11 Perform/Do not perform removal of R11 load instruction in _ptrgl csect (the default is to perform the optimization) -pto, --ptrgl-optimization Perform optimization of indirect call instructions via registers by replacing them with conditional direct jumps -ptoht <heatness_threshold>, --ptrgl-optimization-heatness-threshold <heatness_threshold> Set the frequency threshold for indirect calls that are to be optimized by -pto optimization. Allowed range between 0 and 1. Default is set to 0.8. (Applicable only with -pto flag) -ptosl <limit_size>, --ptrgl-optimization-size-limit <limit_size> Set the limit of the number of conditional statements generated by -pto optimization. Allowed values are between 1 and 100. Default value is set to 3. (Applicable only with the -pto flag) -rcaf <aggressiveness_factor>, --reorder-code-aggressivenes-factor <aggressiveness_factor> Set the aggressiveness of code reordering optimization. Allowed values are [0 | 1 | 2], where 0 preserves then original code order and 2 is the most aggressive. Default is set to 1. (Applicable only with the -RC flag) -rccrf <reversal_factor>, --reorder-code-condition-reversal-factor <reversal_factor> Set the threshold fraction that determines when to enable condition reversal for each conditional branch during code reordering. Allowed input range is between 0.0 and 1.0 where 0.0 tries to preserve original condition direction and 1.0 ignores it. Default is set to 0.8 (Applicable only with the -RC flag) -rcctf <termination_factor>, --reorder-code-chain-termination-factor <termination_factor> Set the threshold fraction that determines when to terminate each chain of basic blocks during code reordering. Allowed input range is between 0.0 and 1.0 where 0.0 generates long chains and 1.0 creates single basic block chains. Default is set to 0.05. (Applicable only with the -RC flag) -RD, --reorder-data Perform static data reordering -rmte, --remove-multiple-toc-entries Remove multiple TOC entries pointing to the same location in the input program file -rt <removal_factor>, --reduce-toc <removal_factor> Perform removal of TOC entries according to a removal factor between (0,1), where 0 removes non-accessed TOC entries only and 1 removes all possible TOC entries -rtb, --remove-traceback-tables Remove traceback tables in reordered code -sal-opt, --store-after-load-optimization Remove store after load when there is no change -sdp <aggressiveness_factor>, --stride-data-prefetch <aggressiveness_factor> Perform data prefetching within frequently executed loops based on stride analysis, according to an aggressiveness factor between (1,9), where 1 is the least aggressive -sdpla <iterations_number>, --stride-data-prefetch-look-ahead <iterations_number> Set the number of iterations for which data is prefetched into the cache ahead of time. Default value is set to 4 iterations. (Applicable only with the -sdp flag) -sdpms <stride_min_size>, --stride-data-prefetch-min-size <stride_min_size> Set the minimal stride size in bytes, for which data will be considered a candidate for prefetching. Default value is set to 128 bytes. (Applicable only with the -sdp flag) -shci <pct>, --selective-hot-code-inline <pct> Perform selective inlining of functions in order to decrease the total number of execution counts, so that only functions with hotness above the given percentage are inlined -si, --selective-inline Perform selective inlining of dominant hot function calls -sidf <percentage_factor>, --selective-inline-dominant-factor <percentage_factor> Set a dominant factor percentage for selective inline optimization. The allowed range is between 0 and 100. Default is set to 80. (Applicable only with the -si and -pbsi flags) -siht <frequency_factor>, --selective-inline-hotness-threshold <frequency_factor> Set a hotness threshold factor percentage for selective inline optimization to inline all dominant function calls that have a frequency count greater than the given frequency percentage. Default is set to 100. (Applicable only with the -si -pbsi flags) -slbp, --spinlock-branch-prediction Perform branch prediction bit setting for conditional branches in spinlock code containing l*arx and st*cx instructions. (Applicable after -bp flag) -sldp, --spinlock-data-prefetch Perform data prefetching for memory access instructions preceding spinlock code containing l*arx and st*cx instructions -sll <Lib1:Prof1,...,LibN:ProfN>, --static-link-libraries <Lib1:Prof1,...,LibN:ProfN> Statically link hot code from specified dynamically linked libraries to the input program. The parameter consists of a comma-separated list of libraries and their profiles. IMPORTANT: Licensing rights of specified libraries should be observed when applying this copying optimization -sllht <hotness_threshold>, --static-link-libraries-hotness-threshold <hotness_threshold> Set hotness threshold for the --static-link-libraries optimization. The allowed input range is between 0 (least aggressive) and 1, or -1, which does not require a profile and selects all code that might be called by the input program from the given libraries. Default is set at 0.5 -so, --stack-optimization Reduce the stack frame size of functions that are called with a small number of arguments -spc, --shortcut-plt-calls Shortcut PLT calls in shared libraries to local functions if they exist. Note: Resolving to external symbols is disabled for such calls -stf, --stack-flattening Merge the stack frames of inlined functions with the frames of the calling functions -tb, --preserve-traceback-tables Force the restructuring of traceback tables in reordered code. If -tb option is omitted, traceback tables are automatically included only for C++ applications that use the Try & Catch mechanism -tlo, --tocload-optimization Replace each load instruction that references the TOC with a corresponding add-immediate instruction via the TOC anchor register, where possible -ucde, --unreachable-code-data-elimination Remove unreachable code and non-accessed static data -vro, --volatile-registers-optimization Eliminate stores and restores of non-volatile registers in frequently executed functions by using available volatile registers -vrox, --volatile-registers-extended-optimization Eliminate stores and restores of non-volatile registers in frequently executed functions by using available volatile registers, the extended version supports FP registers and transparency Output Options: -bcdf <file>, --binary-code-dump-file <file> Create a binary dump of the code (opcodes) with annotations of addresses -cep, --complement-edge-profile Complements partial profile information given for the basic blocks' frequencies by adding missing basic block-to-basic block edge counts -d, --disassemble-text Print the disassembled text section of the output program into <output_file>.dis_text file -dap, --dump-ascii-profile Dump profile information in ASCII format into <program>.aprof (requires the -f flag) -db, --disassemble-bss Print the disassembled bss section of the output program into <output_file>.dis_bss file -dd, --disassemble-data Print the disassembled data section of the output program into <output_file>.dis_data file -diap, --dump-initial-ascii-profile Dump initial profile information in ASCII format into <program>.aprof.init (requires the -f flag) -dim, --dump-instruction-mix Dump instruction mix statistics based on gathered profile information -dm, --dump-mapper Print a map of basic blocks and static variables with their respective new -> old addresses into a <program>.mapper file -enc, --encapsulate Encapsulate SPE executables present in the PPE input (see --spe-directory) -o <output_file>, --output-file <output_file> Set the name of the output file. The default instrumented file is <program>.instr. The default optimized file is <program>.fdpr -pif, --print-inlined-funcs Print the list of inlined functions along with their corresponding calling functions into a <output_file>.inl_list file (requires the -si or -i or -isf flags) -plc, --preserve-linkage-conventions Preserve linkage conventions -ppcf, --print-prof-counts-file Print the profiling counters in ASCII format into a <program>.counts file (requires the -f flag) -sf, --strip-file Strip the optimized output file -simo, --single-input-multiple-outputs Optimize in parallel into multiple outputs as specified by option sets read from stdin -spedir <directory>, --spe-directory <directory> Set the directory into which SPE executables will be extracted and from which they will be encapsulated General Options: -cell, --cell-supervisor Integrated PPE/SPE processing. Perform SPE extraction, processing, and encapsulation automatically prior to PPE processing -h, --help Print online help -m <machine-model>, --machine <machine-model> Generate code for the specified machine model. Target machine can be one of the following models: power2, power3, ppc405, ppc440, power4, ppc970, power5, power6, ppe, spe, spe_edp, zArch6, zArch5. Default is set to no machine -q, --quiet Set quiet output mode, suppressing informational messages -st <stat_file>, --statistics <stat_file> Output statistics information to <stat_file>. If <stat_file> is '-', the output goes to standard output. See --verbose for the default -v <level>, --verbose <level> Set verbose output mode level. When set, various statistics about the target optimized program are printed into the file <program>.stat. Allowed level range is between 0 and 3. Default is set to 0 -V, --version Print version -armember For archive files - list of archive members to be optimized, if -armember is not specified, all members will be optimized