-xP is like -march=prescott
-axP is like -march=i386 -mtune=prescott

-fast turns on -O3, -ipo, -static, -no-prec-div, and -xP, on a i32, i32em.

-f[no-]omit-frame-pointer works, on i32, i32em.

-Ob1 enables inlined functions which are declared.

-Ob2 turns on -ip, and inlines functions at the compiler's descretion based
	on your cpu cache size and program flow.

-mp maintains floating-point precision, but disables some optimizations.

-mp1 is improved floating-point precision. Disables fewer optimizations than
	-mp.

-O Disable optimizations.

-O1 optimize for size (like gcc -Os).

-O2 is the default.

-O3 Suggested for programs with lots of floating point calculations. Uses more
	agressive optimizations.

-rcd Break conformance to C semantics to enable fast float-to-int conversions.

-ansi-alias This will optimize more agressively but will miscompile code which
	does not strictly adhere to the ISO C Standard.

-ipo Link time optimizations. Expand inline functions for calls to functions
	defined in seperate files.

-ipo0 Let the compiler decide how many object files to create depending on
	code size.

-opt-report Generate an optimization report, sent to stderr.

-opt-report-file=report.txt Send optimization report to a file.

-opt-report-help List of logical names of optimizers.

-opt-report-level[<level>] Either min, med, or max. min is default.

-prof-gen[x] Generate code profiles. The x generates extra information.

-prof-gen-sampling Prepare code for the profrun sample gathering tool.
	See: http://www.intel.com/software/products/compilers/flin/docs/main_for/mergedProjects/optaps_for/common/optaps_pgo_profrun.htm
	Don't use -prof-genx and -prof-gen-sampling at the same time.
	The depends on the VTune application.

-prof-use Use code profiles.

env PROF_DIR (set this to $(pwd) in config.site)

The PGO methodology requires three phases:

	Phase 1: Instrumentation compilation and linking with -prof-gen[x]
	Phase 2:  Instrumented execution by running the executable
	Phase 3:  Feedback compilation with -prof-use

-ssp See: http://www.ncsa.uiuc.edu/UserInfo/Resources/Software/Intel/Compilers/9.0/C_ReleaseNotes.htm
http://portal.acm.org/citation.cfm?id=512529.512544&coll=&dl=ACM&CFID=15151515&CFTOKEN=6184618
http://sc.tamu.edu/help/intel/9.0/main_for/mergedProjects/optaps_for/common/optaps_pgo_sspopt.htm
http://sc.tamu.edu/help/intel/9.0/main_for/mergedProjects/copts_for/common_options/option_ssp.htm

-no-gcc Do   not  predefine  the  __GNUC__,  __GNUC_MINOR__,  and
	__GNUC_PATCHLEVEL__ macros.

-fstack-security-check Enable overflow security checks.

-gcc-version=<nnn> Provide compatable behaviour:
	320 -- if gcc version is 3.2
	330 -- if gcc version is 3.3
	340 -- if gcc version is 3.4
	400 -- if gcc version is 4.0
	410 -- if gcc version is 4.1

-strict-ansi -ansi-alias -c99 together?