re PR target/41175 (-Os generates significantly larger code)

re PR target/41175 (-Os generates significantly larger code)

	PR target/41175
	PR target/40677
	* config/rs6000/rs6000.c (no_global_regs_above): Fix precedence
	problem.
	(SAVRES_NOINLINE_GPRS_SAVES_LR, SAVRES_NOINLINE_FPRS_SAVES_LR,
	SAVRES_NOINLINE_FPRS_DOESNT_RESTORE_LR): New strategy bits.
	(rs6000_savres_strategy): Always save FP registers inline if the
	target doesn't support hardware double-precision.  Set the above
	bits in return value when needed.
	(rs6000_savres_routine_sym): Fix computation for cache selector.
	Mark the generated symbol as a function.  Rename exitp argument to
	lr.  Move code for determining the name of the symbol...
	(rs6000_savres_routine_name): ...here.  New function.  Add cases for
	getting the names right on AIX and 64-bit Linux.
	(savres_routine_name): New variable.
	(rs6000_make_savres_rtx): Rename exitp argument to lr.  Don't assert
	lr isn't set when savep.  Use r12 resp. r1 instead of r11 depending
	on what the target routine uses as a base register.  If savep && lr
	describe saving of r0 into memory slot.
	(rs6000_emit_prologue): Correct use of call_used_regs.  Fix out of
	line calls for AIX ABI.
	(rs6000_output_function_prologue): Use rs6000_savres_routine_name to
	determine FP save/restore functions.
	(rs6000_emit_stack_reset): Handle savres if sp_offset != 0 and
	frame_reg_rtx != sp_reg_rtx.  Use gen_add3_insn instead of
	gen_addsi3.
	(rs6000_emit_epilogue): Adjust computation of restore_lr.
	Duplicate restoration of LR and execute the appropriate one
	depending on whether GPRs are being restored inline.  Set r11 from
	offsetted frame_reg_rtx instead of sp_reg_rtx; if frame_reg_rtx is
	r11, adjust sp_offset.  Use gen_add3_insn instead of gen_addsi3.
	Fix out of line calls for AIX ABI.
	* config/rs6000/rs6000.md (*return_and_restore_fpregs_aix_<mode>):
	New insn.
	* config/rs6000/spe.md (*save_gpregs_spe): Use explicit match for
	register 11.
	(*restore_gpregs_spe): Likewise.
	(*return_and_restore_gpregs_spe): Likewise.
	* config/rs6000/linux64.h (SAVE_FP_SUFFIX, RESTORE_FP_SUFFIX):
	Define to empty string unconditionally.
	* config/rs6000/sysv4.h (SAVE_FP_SUFFIX, RESTORE_FP_SUFFIX):
	Define to empty string unconditionally.
	(GP_SAVE_INLINE, FP_SAVE_INLINE): Handle TARGET_64BIT the same as
	!TARGET_64BIT.

	* gcc.target/powerpc/pr41175.c: New test.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r151729