########################################################################
#06/26/2006  
#Acer Incorporated.
#SPEC CPU2000 v1.3 Flag Descriptions
#Intel C/C++ Compiler 9.1 for Linux
#Intel Fortran Compiler 9.1 for Linux

########################################################################

========================================================================
General Options (C/C++/FORTRAN)
========================================================================

-fast		This option maximizes speed across the entire program.

		It sets the following options (IA-32 and EM64T):
		-O3 -Qipo -Qprec-div- -QxP

-O{1|2|3}	Optimization-level options:
		1: optimize for speed, but disable some optimizations that
		   increase code size for a small speed benefit.  Includes
		   inline expansion for intrinsic functions, global
		   optimizations, string pooling optimizations.
		2: optimizes for speed (DEFAULT).  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. 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.

-Oa[-]	Assume [do not assume] no aliasing in program.

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

-Qipo[value]
		Enables interprocedural optimizations across files. The optional value argument 
		controls the maximum number of link-time compilations (or number of object files) 
		that are spawned. The default for value is 1 when value is not specified. 
		This option is not compatible with the Microsoft /GL option.

-Qprec-div[-]
		Improves precision of floating point divides.

-prof_gen (Linux)
-Qprof_gen	Instrument program for profiling for the first phase of 
		two-phase profile guided optimization.

-prof_use (Linux)
-Qprof_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.

-Qrcd		The Intel compiler uses the -Qrcd option to improve the
		performance of code that requires floating-point-to-integer
		conversions. 

		The system default floating point rounding mode is
		round-to-nearest. This means that values are rounded during 
		floating point calculations. However, the C language requires 
		floating point values to be truncated when a conversion to an
		integer is involved. To do this, the compiler must change the 
		rounding mode to truncation before each floating 
		point-to-integer conversion and change it back afterwards.

		The -Qrcd option disables the change to truncation of the 
		rounding mode for all floating point calculations, including   
		floating point-to-integer conversions. Turning on this option 
		can improve performance, but floating point conversions to 
		integer may not conform to C semantics.

-Qunroll[n]
		Specifies the maximum number of times to unroll a loop. Omit n 
		to let the compiler decide whether to perform unrolling or not. 
		Use n = 0 to disable unroller.

-Qx{K|W|N|B|P}
		Generates specialized code for processor specific codes:

		K: Streamng SIMD Extensions (SSE)
		W: Intel processor with Streamng SIMD Extensions 2 (SSE2)
		N: Intel processor with Streamng SIMD Extensions 2 (SSE2)
		B: Intel processor with Streamng SIMD Extensions 2 (SSE2)
		P: Intel processor with Streamng SIMD Extensions 3 (SSE3)

		Notes:
		Only the -QxW and -QxP options are available on Intel(r) EM64T.

		-Qx{N|B|P}:
		 These options also enable advanced data layout and code restructuring
		 optimizations to improve memory accesses for Intel processors.

		 Programs, where the function main()is compiled with these
		 options, will detect non-compatible processors and generate
		 an error message during execution.

=============================================================================
Flags Specific to C/C++
=============================================================================

-Oi[-]	Enables (DEFAULT) [disables] inline expansion of standard
		library functions.
 
-Qcxx_features
		Enables standard C++ features without disabling Microsoft features and within 
		the bounds of what is provided in the Microsoft headers and libraries. This option
		also enables -GR and -GX.

		-GR[-]	Enables [disables (DEFAULT)] C++ Runtime Type Information (RTTI).
		-GX[-]	Enables [disables (DEFAULT)] C++ exception handling.

 


=================================================================================
Flags Specific to FORTRAN
=================================================================================

-Ob{0|1|2}	Controls the compiler's inline expansion.
		0: disable inlining.
		1: disables inlining unless /Qip 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 /Qip option.

-Qauto	Causes all variables to be allocated on the stack, rather than 
		in local static storage. 


-Qscalar_rep[-]
		Enables (DEFAULT) [disables] scalar replacement performed 
		during loop transformations.

 
-Qipo[value]
		Enables interprocedural optimizations across files. The optional value argument 
		controls the maximum number of link-time compilations (or number of object files) 
		that are spawned. The default for value is 1 when value is not specified.
		This option is not compatible with the Microsoft /GL option.


==============================================================================
General Options and Libraries
==============================================================================
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.

shlW32M.lib
		MicroQuill SmartHeap Library available from www.microquill.com

===============================================================================
Benchmark-Specific Portability Options
===============================================================================
	-DSPEC__CPU2000_LP64
				Compile using LP64 programming model.

176.gcc:
	-Dalloca=_alloca	So as to use the built-in optimized alloca.
	/F10000000		176.gcc uses alloca and this option tells the
				linker to pre-allocate 10MB of stack. The default
				amount of stack allocated is not enough and 176.gcc
				crashes with a run-time error

178.galgel:
	-FI (Linux)
	/FI			Fixed-format F90 source code.
	/F32000000		Same as with 176.gcc, pre-allocates a 32MB stack

186.crafty:
	-DNT_i386		Specifies that it is a Windows NT Intel processor-based 
				system which makes the compiler use "_int64" 
				as the 64-bit variable that 186.crafty needs.        

253.perlbmk:
	-DSPEC_CPU2000_NTOS
				This enables the code changes for porting to
				Windows get included.
	-DPERLDLL		On Windows, we need a perl.exe instead of a
				perl.exe and perl.dll. This pre-defines ensures
				that the changes necessary to get a single, UNIX-style
				executible without getting the indirect calls that
				can cause a 10% performance degradation. This allows
				the Windows-based executible to be as close as possible
				to the Unix-based one.
	/MT			Use the static multi-threaded library else it
				will not compile.

254.gap:
	-DSYS_HAS_CALLOC_PROTO
	-DSYS_HAS_MALLOC_PROTO
				These two pre-defines tell of the existence of
				malloc and calloc prototypes.




============================================================================================================
BIOS Setting Description
============================================================================================================
1. Hardware Prefetch: Default is enabled.
The NetBurst architecture introduced a hardware prefetch mechanism, which automatically prefetches data into the L2 cache in case of sequential data accesses with constant stride.


2. Adjacent Cache Line Prefetch: Default is enabled.
The adjacent cache line prefetch feature, when enabled, will cause the CPU to fetch 2 adjacent cachelines when updating the cache rather than just a cacheline at a time.