[patch] Fixed-point patch 8/10

[Fu, Chao-Ying]

Hi,

  Here is the patch #8.  Please review it.  Thanks!

> 1. Merge in machine modes to support signed and unsigned
> fract and accum modes.  Handle scalar and vector modes.
DONE!
> 2. Merge in fixed-value.h and fixed-value.c to handle fixed-point values.
(fixed-value.diff)
> 3. Merge in TREE structures for fixed-point types and constants.
(tree.diff)
> 4. Merge in C front-end changes to parse _Sat, _Fract and _Accum.
(c-parser.diff)
> 5. Merge in RTL structures for fixed-point constants and operators.
(rtl.diff)
> 6. Merge in libcpp to parse fixed-point constants.
(cpp.diff)
> 7. Merge in changes to support "case" of FIXED_POINT_TYPE, FIXED_CST,
> and CONST_FIXED in .c and .h files.
(changes.diff)
> 8. Merge in the MIPS backend that supports fixed-point instructions.
(mips.diff)
> 9. Merge in configure/build system changes for the runtime library.
> 10. Merge in testsuite (from gcc.dg/fixed-point) that only run
> when the compiler is configured to enable fixed-point.

Regards,
Chao-ying

gcc/ChangeLog
2007-08-01  Chao-ying Fu  <fu@mips.com>

	* config/mips/mips.c (mips_scalar_mode_supported_p): Declare.
	(TARGET_SCALAR_MODE_SUPPORTED_P): Define.
	(mips_emit_compare): Process fixed-point modes.
	(mips_pad_arg_upward): Support fixed-point types.
	(override_options): Allow fixed-point modes in accumulators.
	(mips_pass_by_reference): Pass DQ, UDQ, DA, and UDA modes in registers.
	(mips_vector_mode_supported_p): Support V2HQmode, V2UHQmode, V2HAmode,
	V2UHAmode, V4QQmode, and V4UQQmode when TARGET_DSP.
	(mips_scalar_mode_supported_p): New function to accept fixed-point
	modes if the width is not greater than two BITS_PER_WORD.
	* config/mips/mips.h (SHORT_FRACT_TYPE_SIZE, FRACT_TYPE_SIZE,
	LONG_FRACT_TYPE_SIZE, LONG_LONG_FRACT_TYPE_SIZE,
	SHORT_ACCUM_TYPE_SIZE, ACCUM_TYPE_SIZE, LONG_ACCUM_TYPE_SIZE,
	LONG_LONG_ACCUM_TYPE_SIZE): Define.
	* config/mips/mips.md (mips-fixed.md): Include.
	* config/mips/mips-modes.def: Create VECTOR_MODES for FRACT, UFRACT,
	ACCUM, UACCUM.
	* config/mips/mips-fixed.md: New file.
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