CPU2006 Flag Description
IBM Corporation IBM Power 595 (5.0 GHz, 1 core)

Base Optimization Flags

C benchmarks

• • -bmaxdata:0x40000000
  • 
  • LDCFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • COPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • COPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • COPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

C++ benchmarks

• • -bmaxdata:0x50000000
  • 
  • LDCXXFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • CXXOPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • CXXOPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • CXXOPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qrtti=all
  • 
  • CXXOPTIMIZE

  • Cause the C++ compiler to generate Run Time Type Identification code

• • -D__IBM_FAST_VECTOR
  • 
  • CXXOPTIMIZE

  • The __IBM_FAST_VECTOR macro defines a different iterator for the std::vector template class. This iterator results in faster code, but is not compatible with code using the default iterator for a std::vector template class. All uses of std::vector for a data type must use the same iterator. Add -D__IBM_FAST_VECTOR to the compile line, or "#define __IBM_FAST_VECTOR 1" to your source code to use the faster iterator for std::vector template class. You must compile all sources with this macro.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

Fortran benchmarks

• • -bmaxdata:0x60000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • FOPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • FOPTIMIZE

  • 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.

• • -qsmallstack=dynlenonheap
  • 
  • FOPTIMIZE

  • Causes the Fortran compiler to allocate dynamic arrays on the heap instead of the stack

• • -qalias=nostd
  • 
  • FOPTIMIZE

  •  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. 
    

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

Benchmarks using both Fortran and C

• • -bmaxdata:0x60000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • COPTIMIZE, FOPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • COPTIMIZE, FOPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • COPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qsmallstack=dynlenonheap
  • 
  • FOPTIMIZE

  • Causes the Fortran compiler to allocate dynamic arrays on the heap instead of the stack

• • -qalias=nostd
  • 
  • FOPTIMIZE

  •  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. 
    

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

Peak Optimization Flags

C benchmarks

433.milc

• • -bmaxdata:0x40000000
  • 
  • LDCFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qalign=natural
  • 
  • OPTIMIZE

  •            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.
    

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

470.lbm

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -q64
  • 
  • COPTIMIZE

  • Generates 64 bit ABI binaries. The default is to generate 32 bit ABI binaries.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

482.sphinx3

• • -qpdf1
  • 
  • PASS1_CFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O4
  • 
  • OPTIMIZE

  • 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

    • -O3
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O3
      • -O2
        • -O
      • -qhot=level=0
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

C++ benchmarks

444.namd

• • -qpdf1
  • 
  • PASS1_CXXFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CXXFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

447.dealII

• • -bmaxdata:0x50000000
  • 
  • LDCXXFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qrtti=all
  • 
  • OPTIMIZE

  • Cause the C++ compiler to generate Run Time Type Identification code

• • -D__IBM_FAST_VECTOR
  • 
  • CXXOPTIMIZE

  • The __IBM_FAST_VECTOR macro defines a different iterator for the std::vector template class. This iterator results in faster code, but is not compatible with code using the default iterator for a std::vector template class. All uses of std::vector for a data type must use the same iterator. Add -D__IBM_FAST_VECTOR to the compile line, or "#define __IBM_FAST_VECTOR 1" to your source code to use the faster iterator for std::vector template class. You must compile all sources with this macro.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

450.soplex

• • -bmaxdata:0x40000000
  • 
  • LDCXXFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -qpdf1
  • 
  • PASS1_CXXFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CXXFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O4
  • 
  • OPTIMIZE

  • 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

    • -O3
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O3
      • -O2
        • -O
      • -qhot=level=0
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -qstrict
  • 
  • OPTIMIZE

  •                 Turns off aggressive optimizations which have the
                    potential to alter the semantics of your program.
                    -qstrict sets -qfloat=nofltint:norsqrt. -qnostrict
                    sets -qfloat=rsqrt. This option is only valid with
                    -O2 or higher optimization levels.
    
                    Default:
                         o -qnostrict at -O3 or higher.
                         o -qstrict otherwise.
    
    

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

453.povray

• • -qpdf1
  • 
  • PASS1_CXXFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CXXFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • OPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -qalign=natural
  • 
  • OPTIMIZE

  •            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.
    

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

Fortran benchmarks

410.bwaves

• • -bmaxdata:0x50000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -qsmallstack=dynlenonheap
  • 
  • FOPTIMIZE

  • Causes the Fortran compiler to allocate dynamic arrays on the heap instead of the stack

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

416.gamess

• • -bmaxdata:0x40000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -qpdf1
  • 
  • PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qalias=nostd
  • 
  • OPTIMIZE

  •  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. 
    

434.zeusmp

• • -bmaxdata:0x40000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -qpdf1
  • 
  • PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O3
  • 
  • OPTIMIZE

  • -O3 Performs additional optimizations that are memory intensive, compile-time intensive, and may change the semantics of the program slightly, unless -qstrict is specified. We recommend these optimizations when the desire for run-time speed improvements outweighs the concern for limiting compile-time resources. The optimizations provided include:

    • In-depth memory access analysis
    • Better loop scheduling
    • High-order loop analysis and transformations (-qhot=level=0)
    • Inlining of small procedures within a compilation unit by default
    • Eliminating implicit compile-time memory usage limits
    • Widening, which merges adjacent load/stores and other operations
    • Pointer aliasing improvements to enhance other optimizations

    -O3 is equivalent to the following flags

    • -O2
    • -qhot=level=0

  • Includes:
    • -O2
      • -O
        • -O2
    • -qhot=level=0
• • -qarch=auto
  • 
  • OPTIMIZE

  • Produces object code containg instructins that will run on the specified processors. "auto" selects the processor the complile is being done on. "pwr5x" is the POWER5+ processor.

    Supported values for this flag are

    • auto
    Use the processor on which the program is compiled.
    • pwr6e
    The POWER6 processor in "Enhanced" mode based systems.
    • pwr6
    The POWER6 processor based systems.
    • pwr5x
    The POWER5+ processor based systems.
    • pwr5
    The POWER5 processor based systems.
    • pwr4
    The POWER4 processor based systems.
    • ppc970
    The PPC970 processor based systems.
• • -qtune=auto
  • 
  • OPTIMIZE

  • Specifies the architecture system for which the executable program is optimized. This includes instruction scheduling and cache setting. The supported values for suboption are:

    • auto
    Use the processor on which the program is compiled.
    • pwr6e
    The POWER6 processor in "Enhanced" mode based systems.
    • pwr6
    The POWER6 processor based systems.
    • pwr5x
    The POWER5+ processor based systems.
    • pwr5
    The POWER5 processor based systems.
    • pwr4
    The POWER4 processor based systems.
    • ppc970
    The PPC970 processor based systems.
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -qxlf90=nosignedzero
  • 
  • OPTIMIZE

  •          -qxlf90=
                    Determines whether the compiler provides the
                    Fortran 90 or the Fortran 95 level of support for
                    certain aspects of the language.  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.
    

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

437.leslie3d

• • -O4
  • 
  • OPTIMIZE

  • 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

    • -O3
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O3
      • -O2
        • -O
      • -qhot=level=0
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -q64
  • 
  • FOPTIMIZE

  • Generates 64 bit ABI binaries. The default is to generate 32 bit ABI binaries.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

459.GemsFDTD

• • -qpdf1
  • 
  • PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -q64
  • 
  • FOPTIMIZE

  • Generates 64 bit ABI binaries. The default is to generate 32 bit ABI binaries.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

465.tonto

• • -bmaxdata:0x20000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -qpdf1
  • 
  • PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

Benchmarks using both Fortran and C

435.gromacs

• • -qpdf1
  • 
  • PASS1_CFLAGS, PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CFLAGS, PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O5
  • 
  • OPTIMIZE

  • 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

    • -O4
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O4
      • -O3
        • -O2
          • -O
        • -qhot=level=0
      • -qipa=level=1
      • -qarch=auto
      • -qtune=auto
    • -qipa=level=2
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -D_ILS_MACROS
  • 
  • COPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

436.cactusADM

• • -bmaxdata:0x60000000
  • 
  • LDFFLAGS

  • Causes the system loader to put the heap in its own segment of the size specified. This is only required for 32-bit applications, as their segments are 256M. If the last digit of the value is "C", then it also turns off the malloc pool option for that executable.

• • -qpdf1
  • 
  • PASS1_CFLAGS, PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_CFLAGS, PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O2
  • 
  • OPTIMIZE

  • -O2 Performs a set of optimizations that are intended to offer improved performance without an unreasonable increase in time or storage that is required for compilation including:

    • Eliminates redundant code
    • Basic loop optimization
    • Can structure code to take advantage of -qarch and -qtune settings

  • Includes:
    • -O
      • -O2
        • -O
• • -qarch=auto
  • 
  • OPTIMIZE

  • Produces object code containg instructins that will run on the specified processors. "auto" selects the processor the complile is being done on. "pwr5x" is the POWER5+ processor.

    Supported values for this flag are

    • auto
    Use the processor on which the program is compiled.
    • pwr6e
    The POWER6 processor in "Enhanced" mode based systems.
    • pwr6
    The POWER6 processor based systems.
    • pwr5x
    The POWER5+ processor based systems.
    • pwr5
    The POWER5 processor based systems.
    • pwr4
    The POWER4 processor based systems.
    • ppc970
    The PPC970 processor based systems.
• • -qtune=auto
  • 
  • OPTIMIZE

  • Specifies the architecture system for which the executable program is optimized. This includes instruction scheduling and cache setting. The supported values for suboption are:

    • auto
    Use the processor on which the program is compiled.
    • pwr6e
    The POWER6 processor in "Enhanced" mode based systems.
    • pwr6
    The POWER6 processor based systems.
    • pwr5x
    The POWER5+ processor based systems.
    • pwr5
    The POWER5 processor based systems.
    • pwr4
    The POWER4 processor based systems.
    • ppc970
    The PPC970 processor based systems.
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -qenablevmx
  • 
  • OPTIMIZE

  • Enables the generation of vector instructions for processors that support them.

• • -qvecnvol
  • 
  • OPTIMIZE

  • 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.

• • -qfdpr
  • 
  • OPTIMIZE

  • The compiler generates additional symbol information for use by the AIX "fdpr" binary optimization tool.

• • -qnostrict
  • 
  • OPTIMIZE

  •                 Turns off aggressive optimizations which have the
                    potential to alter the semantics of your program.
                    -qstrict sets -qfloat=nofltint:norsqrt. -qnostrict
                    sets -qfloat=rsqrt. This option is only valid with
                    -O2 or higher optimization levels.
    
                    Default:
                         o -qnostrict at -O3 or higher.
                         o -qstrict otherwise.
    
    

• • -D_ILS_MACROS
  • 
  • COPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

454.calculix

• • -qpdf1
  • 
  • PASS1_FFLAGS, PASS1_LDFLAGS

  • 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 exectuion path and data values. It does not use hardware counters, nor gather any data other than path and data values for PDF specific optimizations.

• • -qpdf2
  • 
  • PASS2_FFLAGS, PASS2_LDFLAGS

  • The option used in the second pass of a profile directed feedback compile that causes PDF information to be utilized during optimization.

• • -O4
  • 
  • OPTIMIZE

  • 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

    • -O3
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto

  • Includes:
    • -O3
      • -O2
        • -O
      • -qhot=level=0
    • -qipa=level=1
    • -qarch=auto
    • -qtune=auto
• • -qlargepage
  • 
  • OPTIMIZE

  • 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.

• • -D_ILS_MACROS
  • 
  • COPTIMIZE

  • Causes AIX to define "ischar()" (and friends) as macro's and no subroutines.

• • -blpdata
  • 
  • EXTRA_LDFLAGS

  • Sets the bit in the file's XCOFF header indicating that this executable will request the use of large pages when they are available on the system and when the user has an appropriate privilege

481.wrf

• • basepeak = yes