Ping [ARM back-end and middle-end patch] stack check for threads

[Thomas Klein]

ping

rename subject line due to
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01189.html

references
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00310.html
http://gcc.gnu.org/ml/gcc-patches/2011-08/msg00216.html
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00281.html
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00149.html
http://gcc.gnu.org/ml/gcc-patches/2011-06/msg01872.html
http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01226.html

gcc/ChangeLog

2011-09-21  Thomas Klein <th.r.klein@web.de>
     * opts.c (common_handle_option): introduce new parameters "direct" and
     "indirect"
     * flag-types.h (enum stack_check_type): Likewise

     * explow.c (allocate_dynamic_stack_space):
     - suppress stack probing if parameter "direct", "indirect" or if a
     stack-limit is given
     - do additional read of limit value if parameter "indirect" and a
     stack-limit symbol is given
     - emit a call to a stack_failure function [as an alternative to a trap
     call]
     (function probe_stack_range): if allowed to override the range porbe
     emit generic_limit_check_stack

     * config/arm/arm.c
     (stack_check_work_registers): new function to find possible working
     registers [only used by "stack check"]
     (emit_push_regs): add push RTL instruction without keeping regnumber
     and frame memory in mind.
     (emit_pop_regs): add pop RTL instruction to revert the above push
     (emit_stack_check_insns): new function to write RTL instructions for
     stack check at prologue stage.
     (arm_expand_prologue): stack check integration for ARM and Thumb-2
     (thumb1_output_function_prologue): stack check integration for Thumb-1

     * config/arm/arm.md
     (cbranchsi4_insn): allow compare and branch using stack pointer
     register [at thumb mode]
     (arm_cmpsi_insn): allow comparing using stack pointer register [at arm]
     (probe_stack): do not emit code when parameters "direct" or "indirect"
     is given, emit move code way same as in gcc/explow.c [function
     emit_stack_probe]
     (probe_stack_done): dummy to make sure probe_stack insns are not
     optimized away
     (generic_limit_check_stack): if stack-limit and parameter "generic" is
     given use the limit the same way as in function
     allocate_dynamic_stack_space
     (stack_failure): failure call used in stack check functions
     emit_stack_check_insns, generic_limit_check_stack or
     allocate_dynamic_stack_space [similar to a trap but avoid conflict with
     builtin_trap]

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