[fixed-point] Patch for new machine modes

[Fu, Chao-Ying]

Hello,

  Here is the patch to add new machine modes
for signed/unsigned fractional and accumulator data.
The number of integral and fractional bits in these machine modes
can be changed by using ADJUST_IBIT and ADJUST_FBIT in the
backend's ???-modes.def.  Thanks!

Regards,
Chao-ying

2006-11-03  Chao-ying Fu  <fu@mips.com>

	* genmodes.c (struct mode_data): Add ibit and fbit fields.
	(blank_mode): Initialize ibit and fbit.
	(adj_ibit, adj_fbit): New to adjust ibit and fbit.
	(vector_class): Handle MODE_FRACT, MODE_UFRACT, MODE_ACCUM, MODE_UACCUM.
	(new_adjust): Change required_class to required_class_from and
	required_class_to for testing within a range.
	(complete_mode): Handle MODE_FRACT, MODE_UFRACT, MODE_ACCUM,
	MODE_UACCUM, MODE_VECTOR_FRACT, MODE_VECTOR_UFRACT, MODE_VECTOR_ACCUM,
	MODE_VECTOR_UACCUM.
	(FRACT_MODE, UFRACT_MODE, ACCUM_MODE, UACCUM_MODE): New.
	(make_fixed_point_mode): New.
	(_ADD_ADJUST): Change C to C1 and C2.
	(ADJUST_BYTESIZE, ADJUST_ALIGNMENT, ADJUST_FLOAT_FORMAT): Change to
	use a range for machine classes.
	(ADJUST_IBIT, ADJUST_FBIT): New.
	(emit_insn_modes_h): Output defines of CONST_MODE_IBIT and
	CONST_MODE_FBIT.
	(emit_mode_adjustments): Handle MODE_VECTOR_FRACT, MODE_VECTOR_UFRACT,
	MODE_VECTOR_ACCUM, MODE_VECTOR_UACCUM.
	Emit adjustment for ibit and fbit.
	(emit_mode_ibit, emit_mode_fbit): New.
	(emit_insn_modes_c): Add emit_mode_ibit and emit_mode_fbit.
	* mode-classes.def (MODE_FRACT, MODE_UFRACT, MODE_ACCUM, MODE_UACCUM,
	MODE_VECTOR_FRACT, MODE_VECTOR_UFRACT, MODE_VECTOR_ACCUM,
	MODE_VECTOR_UACCUM): New mode classes.
	* machmode.def: Add QQ, HQ, SQ, DQ, TQ, UQQ, UHQ, USQ, UDQ, UTQ,
	HA, SA, DA, TA, UHA, USA, UDA, UTA.
	* machmode.h (VECTOR_MODE_P): Test MODE_VECTOR_FRACT,
	MODE_VECTOR_UFRACT, MODE_VECTOR_ACCUM, MODE_VECTOR_UACCUM.
	(CLASS_HAS_WIDER_MODES_P): Test MODE_FRACT, MODE_UFRACT, MODE_ACCUM,
	MODE_UACCUM.
	(FRACT_MODE_P, UFRACT_MODE_P, ALL_FRACT_MODE_P, ACCUM_MODE_P,
	UACCUM_MODE_P, ALL_ACCUM_MODE_P, SIGNED_FIXED_POINT_MODE_P,
	UNSIGNED_FIXED_POINT_MODE_P, ALL_FIXED_POINT_MODE_P): New.
	* doc/rtl.texi (Machine Modes): Document QQ, HQ, SQ, DQ, TQ,
	UQQ, UHQ, USQ, UDQ, UTQ, HA, SA, DA, TA, UHA, USA, UDA, and UTAmodes.
	Document MODE_FRACT, MODE_UFRACT, MODE_ACCUM, MODE_UACCUM.
	Document GET_MODE_IBIT, and GET_MODE_FBIT.
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