x86 option handling cleanup, use more .opt features

[Jan Hubicka]

> 
> Various options with enumerated string arguments are changed to use
> Enum.  Some checking of those arguments was still needed, because the
> valid values depend on e.g. the -m64 setting, but that checking now
> works with the enumerated values not strings.  I didn't change the
> existing logic that -mcmodel=32 isn't allowed with PIC even though the
> 32-bit default is -mcmodel=32 and the implicit option is allowed with
> PIC, though that logic doesn't make sense to me.

The cmodels on 32bit compilation are not really defined, since ABI does not
really speaks on code models there.  "32" code model is more or less a
placeholder for the code model section. But indeed, allowing it with -fPIC
makes sense.
> 
> 2011-05-12  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* config/i386/i386-opts.h: New.
> 	* gcc/config/i386/i386.c (stringop_alg, ix86_cmodel,
> 	ix86_asm_dialect, ix86_regparm, ix86_abi, ix86_branch_cost,
> 	ix86_section_threshold): Remove.
> 	(ix86_handle_option): Move MAX_CODE_ALIGN define here.  Handle
> 	OPT_malign_loops_, OPT_malign_jumps_, OPT_malign_functions_ and
> 	OPT_mbranch_cost_.
> 	(ix86_option_override_internal): Don't decode strings for options
> 	other than -march=, -mtune= and -mfpmath=.  Don't allow for
> 	__attribute__ uses in remaining diagnostics for options with
> 	string arguments.  Don't check for integer arguments being
> 	negative.
> 	* gcc/config/i386/i386.h (enum stringop_alg, enum calling_abi,
> 	enum tls_dialect, enum cmodel, enum asm_dialect): Move to
> 	i386-opts.h.
> 	(ix86_abi, ix86_tls_dialect, ix86_cmodel, ix86_asm_dialect,
> 	ix86_branch_cost, ix86_section_threshold): Remove.
> 	* gcc/config/i386/i386.opt (config/i386/i386-opts.h): New
> 	HeaderInclude.
> 	(malign-functions=, malign-jumps=, malign-loops=): Use UInteger
> 	but not Var.
> 	(masm=): Use Enum and Init.
> 	(asm_dialect): New Enum and EnumValue entries.
> 	(mbranch-cost=): Use UInteger.
> 	(mlarge-data-threshold=): Use UInteger and Init.
> 	(mcmodel=): Use Enum and Init.
> 	(cmodel): New Enum and EnumValue entries.
> 	(mpc): Replace with separate mpc32, mpc64 and mpc80 entries.
> 	(mpreferred-stack-boundary=, mincoming-stack-boundary=,
> 	mregparm=): Use UInteger.
> 	(mstringop-strategy=): Use Enum and Init.
> 	(stringop_alg): New Enum and EnumValue entries.
> 	(mtls-dialect=): Use Enum and Init.
> 	(tls_dialect): New Enum and EnumValue entries.
> 	(mabi=): Use Enum and Init.
> 	(calling_abi): New Enum and EnumValue entries.
> 	(mveclibabi=): Use Enum and Init.
> 	(ix86_veclibabi): New Enum and EnumValue entries.
OK
Thanks for the hard work!
Honza