RTL prologue/epilogue for SPARC
* config/sparc/sparc-protos.h (sparc_emitting_epilogue): Delete.
(sparc_skip_caller_unimp): Likewise.
(load_pic_register): Likewise.
(leaf_return_peephole_ok): Likewise.
(compute_frame_size): Rename into sparc_compute_frame_size.
(sparc_expand_prologue): New prototype.
(sparc_expand_epilogue): Likewise.
(output_return): Likewise.
(eligible_for_epilogue_delay): Rename into eligible_for_return_delay.
* config/sparc/sparc.h (INITIAL_ELIMINATION_OFFSET): Adjust call to
compute_frame_size. Move comment up.
(DELAY_SLOTS_FOR_EPILOGUE): Delete.
(ELIGIBLE_FOR_EPILOGUE_DELAY): Likewise.
(EPILOGUE_USES): Return true for %g1 if the function uses EH return.
* config/sparc/sparc.md (UNSPECV_SAVEW): New constant.
(type attribute): Add 'return' and 'savew'.
(eligible_for_return_delay): New attribute.
(return): New delay_slot.
(sibcall_epilogue): Call sparc_expand_epilogue.
(prologue): Likewise. Move up.
(save_register_window): New expander.
(save_register_windowsi): New pattern.
(save_register_windowdi): Likewise.
(epilogue): New expander.
(return_internal): New pattern.
(Return peepholes): Delete.
* config/sparc/sparc.c (SIBCALL_SLOT_EMPTY_P): New macro.
(sparc_emitting_epilogue): Delete.
(sparc_skip_caller_unimp): Likewise.
(sparc_sr_alias_set): New global variable.
(frame_base_name): Delete.
(frame_base_reg): New global variable.
(sparc_override_options): Get new alias set for save/restore.
(leaf_return_peephole_ok): Delete.
(eligible_for_epilogue_delay): Rename into eligible_for_return_delay.
Factor out code into eligible_for_restore_insn_delay.
(eligible_for_restore_insn_delay): New function extraced from above.
Use IN_UNCOND_BRANCH_DELAY_TRUE instead of IN_BRANCH_DELAY_TRUE.
(eligible_for_sibcall_delay): Use SIBCALL_SLOT_EMPTY_P.
Factor out code into eligible_for_restore_insn_delay.
(load_pic_register): Make static. Remove check.
(save_regs): Delete.
(restore_regs): Likewise.
(compute_frame_size): Rename into sparc_compute_frame_size.
Rename leaf_function into leaf_function_p.
(build_big_number): Delete.
(save_or_restore_regs): New function.
(emit_save_regs): Likewise.
(emit_restore_regs): Likewise.
(emit_stack_pointer_increment ): Likewise.
(emit_stack_pointer_decrement): Likewise.
(sparc_expand_prologue): Likewise.
(sparc_function_prologue): Rename into sparc_asm_function_prologue.
Remove all code to emit instructions.
(sparc_expand_epilogue): New function.
(sparc_function_epilogue): Rename into sparc_asm_function_epilogue.
Remove all code to emit instructions.
(output_restore): New function.
(output_return): Likewise.
(output_sibcall): Factor out code into output_restore.
(print_operand): Adjust for frame_base_reg.
* target.h (struct gcc_target): New field 'late_rtl_prologue_epilogue'.
* target-def.h (TARGET_LATE_RTL_PROLOGUE_EPILOGUE): New define.
(TARGET_INITIALIZER): Add it.
* passes.c (rest_of_compilation): Set the conditional predicate
'current_function_uses_only_leaf_regs' before sched2. If target
has 'late_rtl_prologue_epilogue', emit RTL prologue/epilogue right
before sched2.
* reorg.c (return_insn_p): New predicate.
(find_end_label): Use it.
(relax_delay_slots): Do not thread an unconditional jump that points
to the end return label.
* doc/tm.texi (Registers) <Leaf Functions>: Clarify the validity
domain of 'current_function_uses_only_leaf_regs'.
(Stack and Calling) <Function Entry>: Document new target hook
TARGET_LATE_RTL_PROLOGUE_EPILOGUE.
From-SVN: r83901
