[AArch64][2/2] Implement -fpic for -mcmodel=small

[AArch64][2/2] Implement -fpic for -mcmodel=small

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.

From-SVN: r225017