lib2funcs.S (TRAMPOLINE_SIZE): Change from 49 to 59.

        * config/xtensa/lib2funcs.S (TRAMPOLINE_SIZE): Change from 49 to 59.
        * config/xtensa/xtensa-config.h (XCHAL_HAVE_CONST16,
        XCHAL_HAVE_L32R): New.
        * config/xtensa/xtensa-protos.h (non_const_move_operand,
        xtensa_load_constant, xtensa_function_prologue,
        xtensa_function_epilogue): Delete prototypes.
        (xtensa_expand_prologue): New.
        * config/xtensa/xtensa.c (frame_size_const,
        TARGET_ASM_FUNCTION_PROLOGUE, TARGET_MACHINE_DEPENDENT_REORG,
        non_const_move_operand, xtensa_load_constant, xtensa_reorg,
        xtensa_function_prologue): Delete.
        (add_operand, xtensa_mem_offset): Formatting.
        (move_operand): If the const16 option is available, allow any SFmode
        and SImode constants.
        (xtensa_emit_move_sequence): Inline the former contents of
        xtensa_load_constant with modifications to handle the const16 option.
        (override_options): Add xtensa_char_to_class['W'] and set it to
        the general register class only if the const16 option is enabled.
        Fix formatting.  Disallow PIC when using the const16 option.
        (print_operand): Reorganize to switch on "letter" instead of the
        RTL code.  Add output_operand_lossage calls for invalid cases.
        Add support for 't' and 'b' letters.
        (xtensa_expand_prologue): New function to replace
        xtensa_function_prologue and xtensa_reorg.
        (xtensa_function_epilogue): Declare this as static.  Delete code
        to print the retw.n or retw instruction.
        (xtensa_return_addr): Use A0_REG instead of 0.
        (xtensa_rtx_costs): Add costs for using the const16 option.
        * config/xtensa/xtensa.h (MASK_CONST16, TARGET_CONST16): New.
        (TARGET_DEFAULT): Add CONST16 if L32R instructions not available.
        (TARGET_SWITCHES): Add "const16" and "no-const16".
        (REG_CLASS_FROM_LETTER): Add comment about new 'W' letter.
        (EXTRA_CONSTRAINT): Change 'T' constraint to only apply when not
        using the const16 option.
        (TRAMPOLINE_TEMPLATE): Rewrite to avoid hardwired use of l32r insn.
        (TRAMPOLINE_SIZE): Change from 49 to 59.
        (INITIALIZE_TRAMPOLINE): Adjust offsets to match new trampoline.
        (GO_IF_LEGITIMATE_ADDRESS): Do not allow constant pool addresses
        when using the const16 option.
        (PREDICATE_CODES): Delete non_const_move_operand.
        * config/xtensa/xtensa.md (define_constants): Add A1_REG, A8_REG, and
        UNSPECV_ENTRY.
        (movdi, movdf): If the source is a constant, always expand to a
        sequence of movsi insns.
        (movdi_internal, movdf_internal): Remove alternative using l32r insns.
        (movsi_internal, movsf_internal): Add alternative using const16 insns.
        (movsf): Add const16 support.
        (entry, prologue, epilogue): New.
        (set_frame_ptr): Add missing mode for unspec_volatile operation.
        Likewise for subsequent split pattern.
        * doc/invoke.texi (Option Summary, Xtensa Options): Document new
        "-mconst16" and "-mno-const16" options.

From-SVN: r66809