PATCH: mips16 function attributes, version N+1

[David Daney]

Sandra Loosemore wrote:
> Richard Sandiford wrote:
>
>> Unfortunately, I think removing the code _will_ need a retest.  OK with
>> that change on top of the other ones.
>
> OK, fixed up as suggested, retested, and committed now.  For the 
> record, I'm attaching the final version of the patch as committed.
>
> -Sandra
>

How was this tested?

It causes bootstrap failure due to an ICE building libstdc++ on 
mipsel-linux.

See: http://gcc.gnu.org/ml/gcc/2007-09/msg00143.html

David Daney

>
>
> 2007-09-05  Sandra Loosemore  <sandra@codesourcery.com>
>         David Ung  <davidu@mips.com>
>             Nigel Stephens <nigel@mips.com>
>
>     Add mips16/nomips16 function attributes and -mflip-mips16 option
>     for testing mixed-mode compilation.
>
>     gcc/
>
>     * config/mips/mips.opt (mflip-mips16): New.
>
>     * config/mips/mips.h (SYMBOL_FLAG_MIPS16_FUNC): Define.
>     (SYMBOL_FLAG_MIPS16_FUNC_P): Define.
>
>     * config/mips/mips.c (mips_base_target_flags): New.
>     (mips_base_mips16): New.
>     (mips_base_schedule_insns): New.
>     (mips_base_reorder_blocks_and_partition): New.
>     (mips_base_align_loops): New.
>     (mips_base_align_jumps): New.
>     (mips_base_align_functions): New.
>     (mips16_flipper): New.
>     (mips_attribute_table): Add "mips16" and "nomips16" entries.
>     (TARGET_SET_CURRENT_FUNCTION): Define.
>     (mips_mips16_type_p, mips_nomips16_type_p): New.
>     (mips_comp_type_attributes): Check mips16/nomips16 attributes.
>     (mips_function_ok_for_sibcall): Make it deal with functions with
>     mips16 attributes.
>     (mips_init_split_addresses): New, split out from override_options.
>     (mips_init_relocs): New, split out from override_options.
>     (was_mips16_p): New.
>     (mips_set_mips16_mode): New, split out from override_options.
>     (mips_set_current_function): New.
>     (override_options):  Add sorry for unsupported mips16/pic
>     combination.  Remove error for mips16/dsp combination.    Save
>     base option settings.
>     (mips_file_start): Move mips16 mode setting output from here....
>     (mips_output_function_prologue): ....to here.
>     (mips_output_mi_thunk): Check for mips16 function.
>     (build_mips16_function_stub): Don't set .mips16 here.
>     (build_mips16_call_stub): Likewise.
>     (mips_expand_builtin): Error in mips16 mode.
>     (mips_use_mips16_mode_p): New.
>     (mips_encode_section_info): Check for mips16 function, and set
>     SYMBOL_REF_FLAGS accordingly.
>
>     * doc/extend.texi (Function Attributes): Document new
>     mips16/nomips16 attributes.
>     * doc/invoke.texi (Option Summary): Add -mflip-mips16.
>     (MIPS Options): Document -mflip-mips16.
>
>     gcc/testsuite/
>     * gcc.target/mips/mips16-attributes.c: New.
>