Description of compiler flags for Intel C++ Compiler 8.1
--------------------------------------------------------
-O1 Optimize to favor code size and code locality. Disables
loop unrolling. -O1 may improve performance for applica-
tions with very large code size, many branches, and exe-
cution time not dominated by code within loops. In most
cases, -O2 is recommended over -O1.

-O2 (DEFAULT)
Optimize for code speed. This is the generally recom-
mended optimization level.

-O3 Enable -O2 optimizations and in addition, enable more
aggressive optimizations such as loop and memory access

-ax<codes> generate code specialized for processor extensions
specified by <codes> while also generating generic code.
<codes> includes one or more of the following characters:
W Pentium 4 processor with Streaming SIMD Extensions 2
P Pentium 4 processor with Streaming SIMD Extensions 3

-x<codes> generate specialized code to run exclusively on processors
supporting the extensions indicated by <codes> as
described above.

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Additional Notes on -xP:
----------------------------------------------------------------------------------
-xP The -xP option targets 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.
----------------------------------------------------------------------------------

-Ob{0|1|2} Controls the compiler's inline expansion.
0: disable inlining.
1: disables inlining unless -ip or -Ob2 are specified.
2: enables inlining of any function. However, the
compiler decides which functions are inlined. This
option enables interprocedural optimizations and has
the same effect as specifying the -ip option.

-ip enable single-file IP optimizations
(within files, same as -Ob2)

-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

-fast The -fast option maximizes speed across the entire pro-
gram. It sets command options that can improve run-time
performance, as follows:

The -fast option turns on -O3, -ipo, -static,
and -xP. IA-32 programs compiled with -fast will execute
only on Intel(R) Pentium(R) 4 processors with Streaming
SIMD Extensions 3 (SSE3). Programs compiled with this
option will detect non-compatible processors and generate
an error message during execution.

-ansi_alias Directs the compiler to assume that the program
adheres to the type-based aliasing rules defined in Section 6.5 of the ISO C
Standard. If your program adheres to these rules, this option will allow
the compiler to optimize more aggressively. If it doesn't adhere to these
rules, it can cause the compiler to generate incorrect code.

-prof_gen instrument program for profiling for the first phase of
two-phase profile guided otimization

-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, -prof_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

-alias_args[-]
Assume arguments may be aliased. (DEFAULT) [not aliased].

Description of compiler flags for Intel FORTRAN Compiler 8.1
-------------------------------------------------------------
-O1 Optimize to favor code size and code locality. Disables
loop unrolling. -O1 may improve performance for applica-
tions with very large code size, many branches, and exe-
cution time not dominated by code within loops. In most
cases, -O2 is recommended over -O1.

-O2 (DEFAULT)
Optimize for code speed. This is the generally recom-
mended optimization level.

-O3 Enable -O2 optimizations and in addition, enable more
aggressive optimizations such as loop and memory access

-x<codes> generate specialized code to run exclusively on processors
supporting the extensions indicated by <codes> as
described above.

-ip enable single-file IP optimizations
(within files, same as -Ob2)

-fast The -fast option maximizes speed across the entire pro-
gram. It sets command options that can improve run-time
performance, as follows:

-ansi_alias Enables (default) or disables the compiler to assume that the program
adheres to the ANSI Fortran type aliasablility rules. For example, an object
of type real cannot be accessed as an integer. You should see the ANSI
standard for the complete set of rules

-prof_gen instrument program for profiling for the first phase of
two-phase profile guided otimization

-scalar_rep(-) Enables(disables) scalar replacement performed during loop
transformations (requires /O3).

-auto Causes all variables to be allocated on the stack, rather than
in local static storage. Does not affect variables that appear in an
EQUIVALENCE or SAVE statement, or those that are in COMMON. Makes all
local variables AUTOMATIC, same as /4Ya.

Portability options for CPU2000:
-------------------------------

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