This patch adds better support for displaying SSE2 registers and changes 
support for SSE registers. It also allows them to work with the latest 
Insight.

Previously registers were displayed as:
(gdb) p $xmm0
$1 = {f = {0, 0, 0, 0}}

With this patch they will be printed as:

(gdb) p $xmm0
$1 = {v4_float = {0, 0, 0, 0}, v2_double = {0, 0}, v16_int8 = '\0' <repeats 15 
times>, v8_int16 = {0, 0, 0, 0, 0, 0, 0, 0}, v4_int32 = {0, 0, 0, 0}, 
v2_int64 = {0, 0}, uint128 = 0x00000000000000000000000000000000}

or you can do

(gdb) p $xmm0.v4_float
$2 = {0, 0, 0, 0}

Right now the code prints the register as if it were SSE2.  For SSE registers, 
only v4_float is actually used. 

-- 
Martin Hunt
GDB Engineer
Red Hat, Inc.

2002-05-17  Martin M. Hunt  <hunt@redhat.com>

	* i386-tdep.c (i386_register_virtual_type): Return 
	builtin_type_vec128i for SSE registers.

	* gdbtypes.h (builtin_type_vec128i): Declare.

	* gdbtypes.c (build_builtin_type_vec128i): New function.
	(builtin_type_v2_double, builtin_type_v4_int64): New types.
	(builtin_type_vec128i): New type for SSE2 128-bit registers.
	(build_gdbtypes): Initialize new builtin vector types.
	(_initialize_gdbtypes): Register new vector types with gdbarch.