[AArch64/wwwdoc] Document -fpic support for small memory model

[Jiong Wang]

Jiong Wang writes:

> Marcus Shawcroft writes:
>
>> On 26 June 2015 at 10:32, Jiong Wang <jiong.wang@arm.com> wrote:
>>>
>>> This patch respin https://gcc.gnu.org/ml/gcc-patches/2015-05/msg01804.html.
>>>
>>> A new symbol classification "SYMBOL_SMALL_GOT_28K" added to represent symbol
>>> which needs go through GOT table and it's under -fpic/-mcmodel-small. the "_28K"
>>> suffix can reflect the symbol's attribute better, and by introducing this new
>>> symbol type, we could avoid checking aarch64_cmodel at some extent
>>> though still needs the check somewhere.
>>>
>>> All other code logic not changed.
>>>
>>> OK for trunk?
>>>
>>> Thanks.
>>>
>>> 2015-06-26  Jiong. Wang  <jiong.wang@arm.com>
>>>
>>> gcc/
>>>   * config/aarch64/aarch64-protos.h (aarch64_symbol_type): New type
>>>   SYMBOL_SMALL_GOT_28K.
>>>   * config/aarch64/aarch64.md: (ldr_got_small_<mode>): Support new GOT
>>>   relocation modifiers.
>>>   (unspec): New enum "UNSPEC_GOTMALLPIC28K.
>>>   (ldr_got_small_28k_<mode>): New.
>>>   (ldr_got_small_28k_sidi): New.
>>>   * config/aarch64/iterators.md (got_modifier): New mode iterator.
>>>   * config/aarch64/aarch64-otps.h (aarch64_code_model): New model.
>>>   * config/aarch64/aarch64.c (aarch64_load_symref_appropriately): Support
>>>   SYMBOL_SMALL_GOT_28K.
>>>   (aarch64_rtx_costs): Add costs for new instruction sequences.
>>>   (initialize_aarch64_code_model): Initialize new model.
>>>   (aarch64_classify_symbol): Recognize new model and new symbol classification.
>>>   (aarch64_asm_preferred_eh_data_format): Support new model.
>>>   (aarch64_load_symref_appropriately): Generate new instruction
>>>   sequences for -fpic.
>>>   (TARGET_USE_PSEUDO_PIC_REG): New definition.
>>>   (aarch64_use_pseudo_pic_reg): New function.
>>>
>>> gcc/testsuite/
>>>   * gcc.target/aarch64/pic-small.c: New testcase.
>>
>>
>> OK, Thanks Jiong.  Could you prepare a NEWS entry for this change?
>> Cheers
>> /Marcus
>
> How about this one?
>
> 2015-06-26  Jiong Wang  <jiong.wang@arm.com>
>
> wwwdocs/
>   * htdocs/gcc-6/changes.html (AArch64): Document -fpic for small
>   model.

Ping.

-fpic patch for AArch64 has been committed, this is the documentation
 counterpart which needs approval.

Thanks.

-- 
Regards,
Jiong