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This pass optimize GOT_PREL (already exists in toolchain/gcc/gcc-4.6)
Backport from svn://gcc.gnu.org/svn/gcc/branches/google/gcc-4_6-mobile
UNSPEC_GOT_PREL_SYM is now in new file arm/unspecs.md
4.9 port is slightly different due to changes in gcc passes
See Google b/14811006
r173209 | carrot | 2011-04-30 16:07:46 +0800 (Sat, 30 Apr 2011) | 21 lines
* hooks.c (hook_rtx_void_null): New function.
* hooks.h (hook_rtx_void_null): New prototype.
* target.def (got_access): New hook vector declaration.
* tree-pass.h (pass_simplify_got): New pass.
* timevar.def (TV_SIMPLIFY_GOT): New TV id.
* simplify-got.c: New source file.
* Makefile.in (simplify-got.o): Add a new file.
* passes.c (init_optimization_passes): Add a new pass.
* config/arm/arm.c (arm_output_addr_const_extra): Output GOT_PREL
relocation.
(arm_get_pic_reg): New function.
(arm_clear_pic_reg): New function.
(arm_can_simplify_got_access): New function.
(arm_loaded_global_var): New function.
(arm_load_global_address): New function.
* config/arm/arm.md (UNSPEC_GOT_PREL_SYM): New UNSPEC symbol.
* testsuite/gcc.target/arm/got1.c: New testcase.
* testsuite/gcc.target/arm/got2.c: New testcase.
Change-Id: I91e881df19bb6937a5fbcc8e6b83d158717c7773
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