The VGATHER group of instructions requires that all three involved

The VGATHER group of instructions requires that all three involved
xmm/ymm registers are distinct. This patch adds code to check for this,
and at once eliminates a superfluous check for not using PC-relative
addressing for these instructions (the fact that an index register is
required here already excludes valid PC-relative addresses). The
severity of the resulting diagnostics can be controlled via command
line option or directive.

gas/
2012-08-07  Jan Beulich <jbeulich@suse.com>

	* config/tc-i386.c (set_check): Renamed from set_sse_check.
	Generalize to also handle operand checking option.
	(enum i386_error): New enumerator 'invalid_vector_register_set'.
	(match_template): Handle it.
	(enum check_kind): Give it a tag. Drop sse_ prefixes from
	enumerators.
	(operand_check): New.
	(md_pseudo_table): Add "operand_check".
	(check_VecOperands): Don't special case RIP addressing. Check
	that vSIB operands use distinct vector registers unless no
	checking was requested.
	(OPTION_MOPERAND_CHECK): New.
	(md_parse_option): Handle it.
	(OPTION_MAVXSCALAR, OPTION_X32): Adjust.
	(md_longopts): Add "moperand-check".
	(md_show_usage): Add help text for it.

gas/testsuite/
2012-08-07  Jan Beulich <jbeulich@suse.com>

	* gas/i386/vgather-check-error.{s,l}: New.
	* gas/i386/vgather-check-none.{s,d}: New.
	* gas/i386/vgather-check-warn.{d,e}: New.
	* gas/i386/vgather-check.{s,d}: New.
	* gas/i386/x86-64-vgather-check-error.{s,l}: New.
	* gas/i386/x86-64-vgather-check-none.{s,d}: New.
	* gas/i386/x86-64-vgather-check-warn.{d,e}: New.
	* gas/i386/x86-64-vgather-check.{s,d}: New.
	* gas/i386/i386.exp: Run new tests.