2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>
	    Chung-Lin Tang  <cltang@codesourcery.com>

	gcc/
	* config/nios2/nios2-protos.h (nios2_expand_return): Declare.
	* config/nios2/nios2.c (struct GTY (()) machine_function): Add
	callee_save_reg_size and uses_anonymous_args fields.
	(nios2_compute_frame_layout): Update for CDX push.n/pop.n usage.
	(nios2_create_cfa_notes): New function.
	(nios2_adjust_stack): New function for adjusting stack.
	(nios2_expand_prologue): Update for CDX push.n/pop.n usage.
	Use nios2_adjust_stack.
	(nios2_expand_epilogue): Likewise.
	(nios2_expand_return): New function.
	(nios2_can_use_return_insn): Update for CDX pop.n usage.
	(nios2_setup_incoming_varargs): Set uses_anonymous_args flag.
	If TARGET_HAS_CDX, defer pushing regs to nios2_expand_prologue.
	* config/nios2/nios2.md (return): Use nios2_expand_return.

Co-Authored-By: Cesar Philippidis <cesar@codesourcery.com>
Co-Authored-By: Chung-Lin Tang <cltang@codesourcery.com>

From-SVN: r225799