re PR target/85657 (Make __ibm128 a separate type, even if long double uses the IBM...

re PR target/85657 (Make __ibm128 a separate type, even if long double uses the IBM double-double format)

[gcc]
2018-06-06  Michael Meissner  <meissner@linux.ibm.com>

	PR target/85657
	* config/rs6000/rs6000-builtin.def (BU_IBM128_2): New helper
	macro for __ibm128 built-in functions.
	(PACK_IF): Add __ibm128 pack/unpack functions.
	(UNPACK_IF): Likewise.
	* config/rs6000/rs6000.c (rs6000_builtin_mask_calculate): Do not
	enable long double built-in functions if long double is IEEE
	128-bit floating point.
	(rs6000_invalid_builtin): Update long double built-in function
	error message.
	(rs6000_expand_builtin): For PACK_IF and UNPACK_IF built-in
	functions, adjust the built-in function to use the long double
	built-in function if __ibm128 and long double are the same type.
	* doc/extend.texi (PowerPC builtins): Update documention for
	__builtin_{,un}pack_longdouble.  Add documentation for
	__builtin_{,un}pack_ibm128.

[gcc/testsuite]
2018-06-06  Michael Meissner  <meissner@linux.ibm.com>

	PR target/85657
	* gcc.target/powerpc/pr85657-4.c: New tests.
	* gcc.target/powerpc/pr85657-5.c: Likewise.
	* gcc.target/powerpc/pr85657-6.c: Likewise.

From-SVN: r261253