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Apple
SPEC CPU2000 FLAG DESCRIPTIONS

- Intel C/C++/Visual FORTRAN Compilers Version 9.1
- For Mac OS X
- Apple-20061120-IC91.txt
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General Options (C/C++/FORTRAN)
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-fast This option maximizes speed across the entire program by
including the following Options (IA32, EM64T)

-O3 -ipo -mdynamic-no-pic -no-prec-div

-O{1|2|3} Optimization-level options:
1: optimize for speed, but disable some optimizations which
increase code size for a small speed benefit. Includes
inline expansion for intrinsic functions, global
optimizations, string pooling optimizations.
2: 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.
3: Builds on -01 and -02 optimizations by enabling high-level
optimization. Enable more aggressive optimizations such as
loop and memory access transformation, and prefetching. The
-O3 optimization optimizes for maximum speed, but may not
improve performance for some programs. The -O3 optimization
may slow down code in some cases compared to -O2
optimization. Recommended for applications that have loops
with heavy use of floating point calculations and process
large data sets. In conjunction with -ax{K|W|N|B|P} and
-x{K|W|N|B|P}, this switch causes the compiler to perform
more aggressive data dependency analysis than for -O2.
This may result in longer compilation times.

-ipo
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

-[no-]prec-div
Improves precision of floating point divides.

-prof_gen
Instrument program for profiling for the first phase of
two-phase profile guided optimization.

-prof_use
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.

-parallel Enable the auto-parallelizer to generate
multi-threaded code for loops that can be safely
executed in parallel. The -parallel option enables
the auto-parallelizer if either the -O2 or -O3
optimization option is also on (the default is -O2).

-i-static (Linux)
This option prevents linking with shared libraries. It causes
the executable to link all libraries statically.

-x<processor>
Generate specialized code for processor specified by <codes>
while also generating generic code.

<processor> is the processor for which you want to target your program.
Possible values are:

K: Code is optimized for Intel� Pentium� III and compatible Intel processors.
W: Code is optimized for Intel Pentium 4 and compatible Intel processors.
N: Code is optimized for Intel Pentium 4 and compatible Intel processors
with Streaming SIMD Extensions 2. The resulting code may contain
unconditional use of features that are not supported on other
processors.
This option also enables new optimizations in addition to Intel
processor-specific optimizations including advanced data layout and
code restructuring optimizations to improve memory accesses for Intel
processors.
B: Code is optimized for Intel Pentium M and compatible Intel processors.
This option also enables new optimizations in addition to Intel
processor-specific optimizations.
P: Code is optimized for Intel� Core� Duo processors, Intel� Core� Solo
processors, Intel� Pentium� 4 processors with Streaming SIMD
Extensions 3, and compatible Intel processors with Streaming SIMD
Extensions 3. The resulting code may contain unconditional use of
features that are not supported on other processors.
This option also enables new optimizations in addition to Intel
processor-specific optimizations including advanced data layout and
code restructuring optimizations to improve memory accesses for Intel
processors.

Additional Notes on <codes> N and P:
------------------------------------
The N and P 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. These options also
enable new optimizations in addition to Intel processor-specific
optimizations including advanced data layout and code restructuring
optimizations to improve memory accesses for Intel processors.

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General Options and Libraries
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The starting tokens "/" and "-" are both equivalent for flags passed to the
compiler. For example, -QxW and /QxW are identical switches.

+FDO PASS1=-Qprof_gen PASS2=-Qprof_use

Using feedback-directed optimization, a profile is generated
on the first pass of compilation and used on the second pass.

-lstmalloc
Links Apple's single threaded malloc implementation.

+FDO PASS1=-Qprof_gen PASS2=-Qprof_use

Using feedback-directed optimization, a profile is generated
on the first pass of compilation and used on the second pass.

shlW32M.lib
MicroQuill SmartHeap Library available from http://www.microquill.com

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Benchmark-Specific Portability Options
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176.gcc:
-DHOST_WORDS_LITTLE_ENDIAN Indicates host is a little endian machine.

186.crafty:
-DLINUX_i386 Linux Intel system, use "long long" as 64-bit variable.

197.parser:
-D_POSIX_SOURCE Treat 197.parser as POSIX compliant source.

252.eon:
-DHAS_ERRLIST Prog env provides specification for "sys_errlist[]".
-DFMAX_IS_DOUBLE Function fmax() returns a double value.

253.perlbmk:
-DSPEC_CPU2000_MACOSX_IA32 Compile for an IA32 system running Mac OS X.

254.gap:
-DSYS_HAS_IOCTL_PROTO
-DSYS_HAS_TIME_PROTO
-DSYS_HAS_SIGNAL_PROTO
-DSYS_HAS_CALLOC_PROTO
These pre-defines tell of the existence of ioctl, time,
signal, and calloc prototypes.

-DSYS_HAS_STDIO_PROTO This pre-define tell the existence of stdio header file.

-DSYS_IS_BSD Specifies that the operating system is BSD compliant.

-DSYS_HAS_ANSI System is ANSI compliant.

178.galgel:
-FI Fixed-format F90 source code.