re PR other/25028 (TImode-to-floating conversions broken)

re PR other/25028 (TImode-to-floating conversions broken)

	PR other/25028
	* libgcc2.h (SF_SIZE, DF_SIZE, XF_SIZE, TF_SIZE): Define.
	* libgcc2.c (__floatdixf, __floatundixf, __floatditf,
	__floatunditf): Use #error if type sizes don't match requirements
	of implementation.
	(__floatdisf, __floatdidf): Unify.  Possibly use XFmode or TFmode
	as wider floating-point type.  Use #error if type sizes don't
	match requirements of implementation.  Avoid overflow in computing
	Wtype_MAXp1_F * Wtype_MAXp1_F.  When special casing conversion,
	shift one more bit.  Cast 1 to DWtype or UDWtype for shifting.
	(__floatundisf, __floatundidf): Likewise.
	* config/ia64/hpux.h (XF_SIZE, TF_SIZE): Define.
	* config/ia64/ia64.c (ia64_init_libfuncs): Use
	_U_Qfcnvfxt_quad_to_quad and _U_Qfcnvxf_quad_to_quad for
	TFmode-TImode conversions.
	* doc/tm.texi (SF_SIZE, DF_SIZE, XF_SIZE, TF_SIZE): Document.

testsuite:
	* gcc.dg/torture/fp-int-convert-timode.c: Only XFAIL for LP64 IA64
	HP-UX.

From-SVN: r108598