Fri Jun 5 23:27:04 1998 Alan Modra <alan@spri.levels.unisa.edu.au>

	* config/tc-i386.c (mode_from_disp_size): Disp16 is mode 2.
	(i386_operand): Simplify checks for valid base/index combinations.
	Disallow `in 4(%dx),%al'.

	* config/tc-i386.c (struct _i386_insn): Make regs, base_reg, and
	index_reg const.
	(add_prefix): Change parameter from char to int.

	* config/tc-i386.h (Ugh): Define opcode modifier.
	* config/tc-i386.c (md_assemble): Print warnings for Ugh insns.

	* config/tc-i386.c (md_assemble): Rewrite MATCH and
	CONSISTENT_REGISTER_MATCH macros to check register types more
	thoroughly.  Check for illegal suffix/operand combinations
	when matching insns with operands.  Handle new `s' suffix, and
	associated FloatMF opcode modifier for float insns with memory
	operands.
	* config/tc-i386.h (FloatMF): Define new opcode modifier.
	(No_sSuf, No_bSuf, No_wSuf, No_lSuf): Likewise.
	(SHORT_OPCODE_SUFFIX, LONG_OPCODE_SUFFIX): Define.
	* config/tc-i386.c: Rename WORD_PREFIX_OPCODE to
	DATA_PREFIX_OPCODE throughout.

	* config/tc-i386.c (REGISTER_WARNINGS): Define.
	(md_assemble): Rewrite suffix/register operand checking code to be
	more thorough.  Remove Abs8,16,32.  Change occurrences of Mem to
	AnyMem, the better to grep.
	(pi): Remove Abs.
	(i386_operand): Don't set Mem bits in i.types[this_operand] when
	given a memory operand.  Don't set Abs bits either.
	(type_names): Remove Mem*, Abs*.
	* config/tc-i386.h (Mem8, Mem16, Mem32, Abs8, Abs16, Abs32): Don't
	define opcode_modifiers as these cases are handled by Disp8,
	Disp16, Disp32 and suffix checks.
	(COMES_IN_BOTH_DIRECTIONS): Remove.
	(FloatR): Define. It's OK to share the bit with ReverseRegRegmem.

	* config/tc-i386.c (md_assemble): Don't emit operand size prefix
	if IgnoreDataSize modifier given.  Remove ShortformW modifier
	test.  Add test for ShortForm in W base_opcode modification.
	Merge Seg2ShortForm and Seg3ShortForm code.
	* config/tc-i386.h (ShortFormW): Remove.
	(IgnoreDataSize): Define.

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