hp-20060621-ic91-flags
SPEC CPU2006 Flag Description for the Intel(R) C++ Compiler 9.1
for 32-bit applications and Intel(R) Fortran Compiler 9.1 for 32-bit
applications
Invoke the Intel C/C++ compiler for 32 bit applications in MS VC
.Net 2003 compatibility mode
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Invoke the Intel Fortran compiler for 32 bit applications
Invoke the Intel C compiler in C99 mode
Invoke the Intel C and C++ compilers in .Net 2003 compatibility mode
For mixed-language benchmarks, tell the compiler to convert routine names to
lowercase for compatibility
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For mixed-language benchmarks, tell the compiler to assume that routine
name end with an underscore
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Tell the compiler to treat source files as C++
optimize for speed, but disable some optimizations which increase
code size for a small speed benefit. Includes inline expansion
except for intrinsic functions, global optimizations, string
pooling optimizations. On IA-32 Windows platforms, -O1 sets the
following:
/Qunroll0, /Oi-, /Op-, /Oy, /Gy, /Os, /GF (/Qvc7 and above),
/Gf (/Qvc6 and below), /Ob2, and /Og
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This is the default level of optimization.
Optimizes for speed. The -O2 option includes O1 optimizations
and in addition enables inlining of intrinsics and more speed
optimizations. On IA-32 Windows platforms, -O2 sets the
following:
/Og, /Oi-, /Os, /Oy, /Ob2, /GF (/Qvc7 and above), /Gf (/Qvc6
and below), /Gs, and /Gy.
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Builds on -01 and -02 optimizations by enabling high-level
optimization. This level does not guarantee higher performance
unless loop and memory access transformation take place. In
conjunction with -QaxK/-QxK and QaxW/QxW, this switch causes the
compiler to perform more aggressive data dependency analysis than
for -O2. This may result in longer compilation times. On IA-32
Windows platforms, -O3 sets the following:
/GF (/Qvc7 and above), /Gf (/Qvc6 and below), and /Ob2
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enable single-file IP optimizations
(within files, same as -Ob2)
Multi-file ip optimizations that includes:
- inline function expansion
- interprocedural constant propogation
- dead code elimination
- propagation of function characteristics
- passing arguments in registers
- loop-invariant code motion
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The -fast option enhances execution speed across the entire program
by including the following options that can improve run-time performance:
-O3 (maximum speed and high-level optimizations)
-Qipo (enables interprocedural optimizations across files)
-QxP (generate code specialized for Intel Pentium 4 processor
and compatible Intel processors with Streaming SIMD Extensions 3)
-Qprec-div- (disable -Qprec-div)
where -Qprec-div improves precision of FP divides (some speed impact)
To override one of the options set by /fast, specify that option after the
-fast option on the command line. The options set by /fast may change from
release to release.
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The -QxN and -QxP options target your program to run on Intel Pentium 4
and compatible Intel processors. The resulting code might contain
unconditional use of features that are not supported on other processors.
Programs, where the function main() is compiled with this option, will
detect non compatible processors and generate an error message during
execution. This option also enables new optimizations in addition to Intel
processor specific optimizations.
These options also enable advanced data layout and code restructuring
optimizations to improve memory accesses for Intel processors.
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(disable -Qprec-div)
Allows the compiler to perform optimizations in FP divides that may
impact precision while improving speed.
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Instrument program for profiling for the first phase of
two-phase profile guided otimization. This instrumentation gathers information
about a program's execution paths and data values but does not gather
information from hardware performance counters. The profile instrumentation
also gathers data for optimizations which are unique to profile-feedback
optimization.
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Instructs the compiler to produce a profile-optimized
executable and merges available dynamic information (.dyn)
files into a pgopti.dpi file. If you perform multiple
executions of the instrumented program, -Qprof_use merges
the dynamic information files again and overwrites the
previous pgopti.dpi file.
Without any other options, the current directory is
searched for .dyn files
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Enable C++ Exception Handling and RTTI
This option has the same effect as specifying /GX /GR.
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This option enables C++ exception handling.
Enables C++ Run Time Type Information (RTTI).
Enable SmartHeap library usage by forcing the linker to
ignore multiple definitions
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Enable SmartHeap library usage by forcing the linker to
ignore multiple definitions
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MicroQuill SmartHeap Library 7.4 available from http://www.microquill.com/
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set the stack reserve amount specified to the linker
Tells the compiler the maximum number of times to unroll loops.
Disables inline expansion of all intrinsic functions.
Disables conformance to the ANSI C and IEEE 754 standards for
floating-point arithmetic.
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Allows use of EBP as a general-purpose register in optimizations.
This option enables most speed optimizations, but disables some
that increase code size for a small speed benefit.
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This option enables global optimizations.
Specifies the level of inline function expansion.
Ob0 - Disables inlining of user-defined functions. Note that
statement functions are always inlined.
Ob1 - Enables inlining when an inline keyword or an inline
attribute is specified. Also enables inlining according
to the C++ language.
Ob2 - Enables inlining of any function at the compiler's
discretion.
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This option tells the compiler to separate functions into COMDATs
for the linker.
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This option enables read only string-pooling optimization.
This option enables read/write string-pooling optimization.
This option disables stack-checking for routines with 4096 bytes
of local variables and compiler temporaries.
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