|
By Diane Meirowitz, January 2009
|
|
|
This article explains how to translate frequently used gnu compiler options to Sun Studio compiler options. It
contains examples, a command translation table,
an option translation table, and links to various resources.
In addition to world class highly optimizing C, C++, and Fortran compilers, Sun Studio software includes the full-featured
dbx debugger
that can debug optimized and parallel code, and the complete performance analyzer.
It is easy to start enjoying the increased performance and features of Sun Studio compilers and tools. Just download the free tools
which run on Solaris/Linux/SPARC/x86 from here, make some minor modifications to your makefiles, and go.
Examples
If you are just getting started with Sun Studio compilers and tools, these examples may be helpful:
% cc -fast -xautopar -g myfile.c |
Compile for best performance, automatic parallelization and analyzer use |
% f95 -fast -xvector=simd -g myfile.f |
Compile for best x86 performance and analyzer use |
% CC -fast -g0 file.c |
Compile for best performance and analyzer use |
% CC -g0 file.c |
Compile for debugging without optimization |
Command Name Translation
The names of the compilers are different, as shown in the table below:
gnu Compiler |
Sun Studio Compiler |
Description |
gcc |
cc |
C compiler |
g++ |
CC |
C++ compiler |
gfortran |
f95 |
Fortran compiler |
Compiler/Linker Option Translation
Many gcc options are exactly the same in Sun Studio compilers. Here is a list of some of those options:
-c, -D, -E, -I, -L, -l, -o, -S, -w. Some options look the same but have slightly different
meanings. For example, -O means high optimization for gcc, but only moderate optimization for Sun Studio compilers,
because -O is equivalent to -O3 while -O5 (or -xO5) is the Sun Studio compiler's highest optimization level.
The following table translates some of the more common gcc options. If you cannot figure out how to
translate a particular option, you can get some help on the
Sun Studio forums.
Here is a convenient way to view all Sun Studio 12 compiler options,
and C, C++, and Fortran User's Guides can be found
here.
gnu Option |
Sun Studio Option |
Description |
-help |
-help |
Prints a summary of available options |
Debugging/Profiling Options
|
-g |
-g |
Produces additional symbol table and optimization information for the debugger and analyzer |
|
-g0 |
C++: Produces additional symbol table information for the debugger and analyzer, but does not disable inlining. See here for more. |
-p -profile |
-g |
Prepares the object code to collect data for profiling |
-fbounds-check |
-C |
Fortran: Enable array bounds checking |
|
-xcheck=init_local |
Initialize local variables to garbage values |
|
-xcheck=stkovf |
Check for stack overflow |
Code
Generation Options
|
-m64 |
-m64 |
Generate code for the 64 bit memory model |
-m32 |
-m32 |
Generate code for the 32 bit memory model |
-fPIC |
-KPIC |
Generates position-independent code |
-fdefault-double-8 |
-xtypemap=double:64 |
Make the size of DOUBLEPRECISION variables be 64 bits |
-fdefault-real-8 |
-xtypemap=real:64 |
Fortran: Make the size of REAL variables be 64 bits |
-fdefault-integer-8 |
-xtypemap=integer:64 |
Fortran: Make the size of INTEGER variables be 64 bits |
-fno-underscoring |
-ext_names=plain |
Fortran: Do not append underscores to external names |
-fsecond-underscore |
available soon |
Fortran: Append 2 underscores to external names containing underscores |
Source Options
|
-fopenmp |
-xopenmp |
Supports the OpenMP interface for explicit parallelization |
-ffree-form |
-free |
Fortran: Free-form source |
-ffixed-form |
-fixed |
Fortran: Fixed-form source |
-ffixed-line-length-132 |
-e |
Fortran: Extend max line length for fixed form source |
Optimization Options
|
-O |
-fast |
Invokes a variety of options as a first guess at best run-time performance |
|
-xO5 |
Selects a high optimization level |
|
-xtarget=native |
Optimize code for the host system |
|
-xalias_level |
CC, cc: Enables the compiler to perform type-based alias analysis and optimizations |
|
-xbuiltin |
Improve the optimization of code that calls standard library functions |
|
-xipo=2 |
Performs whole-program optimizations |
-ftree-vectorize |
-xvector=simd |
Enables automatic generation of the packed SIMD instructions |
-march |
-xarch |
Generates code for a particular instruction set architecture |
-mtune |
-xchip |
Tune for a particular type of hardware |
-ffast-math |
-fsimple=2 |
Selects aggressive floating-point arithmetic optimizations |
-ftree-parallelize-loops |
-xautopar |
Enables automatic parallelization for multiple processors |
-funroll-loops |
-xunroll |
Unroll loops (on at -xO3 in Sun Studio compilers) |
-finline-functions |
-xinline |
Inline functions (on at -xO4 in Sun Studio compilers) |
-fno-inline-functions |
-xinline= |
Disables automatic function inlining |
-Os |
-xspace |
Avoids optimizations that increase code size |
Profile
Feedback
|
-fprofile-generate |
-xprofile=collect |
Generates code to collect profile feedback information |
-fprofile-use |
-xprofile=use |
Uses profile feedback information for optimization |
Linker
|
-shared |
-G |
Linker: Produce a shared object rather than a dynamically linked executable |
-static |
-Bstatic |
Linker: Link with static versions (.a) of libraries (default is -Bdynamic) |
References
Do you have comments about this article? We welcome your participation in our community. Please keep your comments civil and on point. You may optionally provide your email address to be notified of replies - your information is not used for any other purpose. By submitting a comment, you agree to these Terms of Use.
|
Diane Meirowitz
is a senior developer tools staff engineer at Sun Microsystems, Inc., specializing in compiler optimization and High Performance Computing. She has worked on all aspects of compiler software, including front ends, middle ends, back ends, and compiler-compilers, for C, C++ and Fortran. Before joining Sun, Diane developed parallelizing compilers at Thinking Machines Corporation, Kendall Square Research, Digital Equipment Corporation, and Compass, Inc. Diane has a master's degree in computer science and a bachelor's degree in hydrology from The University of New Hampshire, Durham.
|
|
Print-friendly Version
