Using Oracle Developer Studio Compiler Options for Optimizing the Application
You can use the compiler options that are provided by the Oracle Developer Studio compiler to optimize the application. The compiler options that are used in this use case are described in the following table.
Table 2 Oracle Developer Studio Compiler Options
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–DSOLARIS
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Assigns the macro symbol SOLARIS to the preprocessor.
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–fast
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Provides maximum runtime performance. This option provides the following individual compilation optimizations:
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–fns
– Enables the nonstandard floating-point mode in SPARC platforms.
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–fsimple=2 – Selects floating-point optimization preferences.
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–xarch – Specifies the target instruction set architecture.
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–xbuiltin=%all
– Enables better optimization of standard library calls.
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–xcache
– Defines cache properties that are used by the optimizer.
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–xchip
– Specifies the target processor that is used by the optimizer.
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–xlibmil
– Inlines the selected libm library routines for optimization.
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–xlibmopt– Uses library of optimized math routines.
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–xmemalign
– Controls the assumptions that the compiler makes about the alignment of data.
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–xO5 – Generates the highest level of optimization.
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–m64
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Specifies 64-bit memory model for the compiled binary object.
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–xtarget=T5
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Specifies the target platform for instruction set and optimization.
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–xautopar
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Enables automatic parallelization for multiple processors.
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–xdepend
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Analyzes loops for inter-iteration data dependencies and does loop restructuring, including loop interchange, loop fusion, scalar replacement, and elimination of “dead array” assignments.
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–xprefetch=auto
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Enables automatic generation of the prefetch instructions.
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–xcode=pic32
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Generates position-independent code (large model), which might not be as fast as pic13, but has full range. Equivalent to –KPIC. Permits references to at most 2**30 unique external symbols on 32-bit architectures; 2**29 on 64-bit.
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–xipo=2
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Performs inter-procedural aliasing analysis as well as optimizations of memory allocation and layout to improve cache performance.
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–xlinkopt=2
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Instructs the compiler to perform link-time optimization on the resulting executable or dynamic library in addition to any optimizations in the object files. Performs additional data flow analysis, including dead-code elimination and address computation simplification, at link time.
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