* alpha/osf.h (TARGET_HAS_XFLOATING_LIBS): Define.
        * alpha/osf5.h: New file.
        * configure.in (alpha-*-osf5): Add it to tm_file.

        * emit-rtl.c (operand_subword): Support TFmode on a 64-bit target.

        * alpha-protos.h (alpha_emit_xfloating_arith): Declare.
        (alpha_emit_xfloating_cvt, function_arg): Declare.
        * alpha.c (alpha_emit_conditional_branch): Call
        alpha_emit_xfloating_compare for TFmode compares.
        (alpha_lookup_xfloating_lib_func): New.
        (alpha_compute_xfloating_mode_arg): New.
        (alpha_emit_xfloating_libcall): New.
        (alpha_emit_xfloating_arith): New.
        (alpha_emit_xfloating_compare): New.
        (alpha_emit_xfloating_cvt): New.
        (print_operand): Add default abort case.
        (function_arg): Mind FUNCTION_ARG_PASS_BY_REFERENCE.
        * alpha.h (TARGET_HAS_XFLOATING_LIBS): New.
        (BIGGEST_ALIGNMENT): Increase to 128 bits.
        (RETURN_IN_MEMORY): True for TF/TCmode.
        (ALPHA_ARG_SIZE): TF/TCmode is passed indirect.
        (FUNCTION_ARG): Move to function_arg.
        (FUNCTION_ARG_PASS_BY_REFERENCE): New.
        (ASM_OUTPUT_LONG_DOUBLE): New.
        (ASM_OUTPUT_DOUBLE): Always output bits.
        * alpha.md (addtf3, divtf3, multf3, subtf3, cmptf): New.
        (fix_trunctfdi2, floatditf2, floatunsditf2): New.
        (extenddftf2, trunctfdf2): New.

From-SVN: r31579