rs6000-modes.def (IFmode): Define IFmode to provide access to the IBM extended double floating point mode...

2015-06-02  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000-modes.def (IFmode): Define IFmode to
	provide access to the IBM extended double floating point mode if
	long double is IEEE 128-bit floating point.
	(KFmode): Define KFmode to provide access to IEEE 128-bit floating
	point if long double is the IBM extended double type.

	* config/rs6000/rs6000.opt (-mfloat128-none): New switches to
	enable adding IEEE 128-bit floating point support.
	(-mfloat128-software): Likewise.
	(-mfloat128-sw): Likewise.

	* config/rs6000/rs6000.c (rs6000_hard_regno_mode_ok): Do not allow
	128-bit floating point types to occupy any register if
	-mlong-double-64.  Do not allow use of IFmode/KFmode unless
	-mfloat128-software is enabled.
	(rs6000_debug_reg_global): Add IEEE 128-bit floating point debug
	support.
	(rs6000_option_override_internal): Add -mfloat128-* support.
	(rs6000_init_builtins): Setup __ibm128 and __float128 type modes.

	* config/rs6000/rs6000.h (rs6000_builtin_type_index): Add ibm128
	and float128 type nodes.
	(ieee128_float_type_node): Likewise.
	(ibm128_float_type_node): Likewise.

From-SVN: r224042