https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00697.html
	gcc/
	* tree.h (MARK_TS_TYPE_NON_COMMON): New.
	* tree.c (tree_node_structure_for_code): Reformat and alphabetize.

	gcc/cp/
	* c-objcp-common.c (cp-objcp-common.c): Alphababetize and
	correctly mark all C++ nodes.

From-SVN: r275641

2019-09-11  Richard Biener  <rguenther@suse.de>

	* lto-opts.c (lto_write_options): Stream -g when debug is enabled.
	* lto-wrapper.c (merge_and_complain): Pick up -g.
	(append_compiler_options): Likewise.
	(run_gcc): Re-instantiate handling -g0 at link-time.
	* doc/invoke.texi (flto): Document debug info generation.

From-SVN: r275640

2019-09-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/90387
	* vr-values.c (vr_values::extract_range_basic): After inlining
	simplify non-constant __builtin_constant_p to false.

	* gcc.dg/Warray-bounds-44.c: New testcase.

From-SVN: r275639

re PR rtl-optimization/89795 (wrong code with -O2 -fno-dce -fno-forward-propagate -fno-sched-pressure)

	PR rtl-optimization/89795
	* rtlanal.c (nonzero_bits1) <SUBREG>: Do not propagate results from
	inner REGs to paradoxical SUBREGs if WORD_REGISTER_OPERATIONS is set.

From-SVN: r275635

	PR tree-optimization/91723
	* tree-vect-stmts.c (vectorizable_call): Use types_compatible_p check
	instead of pointer equality when checking if argument vectypes are
	the same.

	* gcc.dg/vect/vect-fma-3.c: New test.

From-SVN: r275634

	PR middle-end/91725
	* match.pd ((A / (1 << B)) -> (A >> B)): Call tree_nonzero_bits instead
	of get_nonzero_bits, only call it for integral types.

	* gcc.c-torture/compile/pr91725.c: New test.

From-SVN: r275633

2019-09-11  Richard Biener  <rguenther@suse.de>

	Revert
	2019-09-09  Barnaby Wilks  <barnaby.wilks@arm.com>

	* match.pd: Add flag_unsafe_math_optimizations check
	before deciding on the widest type in a binary math operation.

	* gcc.dg/fold-binary-math-casts.c: New test.

From-SVN: r275632

2019-09-10  Tobias Burnus  <tobias@codesourcery.com>

        * MAINTAINERS: Update my email address.

From-SVN: r275631

From-SVN: r275622

	* parser.c (CP_PARSER_FLAGS_DELAY_NOEXCEPT): New parser flag.
	(cp_parser_lambda_declarator_opt): Pass CP_PARSER_FLAGS_NONE to
	cp_parser_exception_specification_opt.
	(cp_parser_direct_declarator): Adjust a call to
	cp_parser_exception_specification_opt.
	(cp_parser_member_declaration): Pass CP_PARSER_FLAGS_DELAY_NOEXCEPT
	to cp_parser_declarator if not processing a friend or typedef
	declaration.
	(cp_parser_late_noexcept_specifier): Adjust a call to
	cp_parser_noexcept_specification_opt.
	(cp_parser_noexcept_specification_opt): New parameter for parser flags,
	drop the FRIEND_P parameter.  Use the new parameter.
	(cp_parser_exception_specification_opt): Likewise.
	(cp_parser_transaction): Adjust a call to
	cp_parser_noexcept_specification_opt.
	(cp_parser_transaction_expression): Likewise.

	* g++.dg/cpp1z/using7.C: New test.
	* g++.dg/cpp1z/using8.C: New test.

From-SVN: r275617

	* constexpr.c (cxx_eval_increment_expression): Call fold_simple on
	the offset.

	* g++.dg/cpp1y/constexpr-incr2.C: New test.

From-SVN: r275613

    
    Restore Solaris compatibility fixes lost when internal/x/net/lif moved
    to golang.org/x/net/lif.  Also fix the Makefile for x/net/lif and
    x/net/route.
    
    Change x/sys/cpu to get the cache line size from goarch.sh as the
    gofrontend version of internal/cpu does.
    
    Partially based on work by Rainer Orth.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194438

From-SVN: r275611

	PR go/91621
    mksysinfo: change test == to test =
    
    Fixes https://gcc.gnu.org/PR91621
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194569

From-SVN: r275608

    
    Backport of https://golang.org/cl/194440.  Original description:
    
        If an embedded field refers to a type via a pointer, the parser needs
        to know the name of the embedded field. It is possible that the
        pointer type is not yet resolved. This CL fixes the parser to handle
        that case by setting the pointer element type to the unresolved named
        type while the pointer is being resolved.
    
    Updates golang/go#34182
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194562

From-SVN: r275606

After previous patches, it's now possible for call_used_regs to be
the "real" set of call-clobbered registers, without any special
handling for fixed registers.  This patch therefore removes the
separate call_really_used_regs and updates the targets that define
CALL_REALLY_USED_REGISTERS so that they handle call_used_regs in
the same way that they used to handle call_really_used_regs.

With this change, it's no longer necessary for targets that define
CALL_REALLY_USED_REGISTERS to define CALL_USED_REGISTER as well.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* doc/tm.texi.in: Document that exactly one of CALL_USED_REGISTERS
	and CALL_REALLY_USED_REGISTERS must be defined, and that
	CALL_REALLY_USED_REGISTERS is preferred.
	* doc/tm.texi: Regenerate.
	* hard-reg-set.h (target_hard_regs::x_call_really_used_regs): Delete.
	(call_really_used_regs): Likewise.
	* reginfo.c: Raise an #error if both CALL_USED_REGISTERS and
	CALL_REALLY_USED_REGISTERS are defined.
	(initial_call_used_regs): Use CALL_REALLY_USED_REGISTERS as the
	initial value if defined.
	(initial_call_really_used_regs): Delete.
	(saved_call_really_used_regs): Likewise.
	(CALL_REALLY_USED_REGNO_P): Likewise.
	(init_reg_sets): Remove handling of call_really_used_regs.
	(save_register_info, restore_register_info, globalize_reg): Likewise.
	(init_reg_sets_1): Likewise.  Use call_used_regs instead of
	CALL_REALLY_USED_REGNO_P.  Don't set call_used_regs for registers
	outside operand_reg_set.
	(fix_register): Don't change call_used_regs if
	CALL_REALLY_USED_REGISTERS is defined.
	* config/csky/csky.h (CALL_USED_REGISTERS): Delete.
	* config/csky/csky.c (get_csky_live_regs): Use call_used_regs
	instead of call_really_used_regs.
	(csky_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/ia64/ia64.h (CALL_USED_REGISTERS): Delete.
	* config/ia64/ia64.c (fix_range): Don't set call_used_regs when
	making a register fixed.
	* config/m32r/m32r.h (CALL_USED_REGISTERS): Delete.
	* config/m32r/m32r.c (MUST_SAVE_REGISTER): Use call_used_regs
	instead of call_really_used_regs.
	(m32r_conditional_register_usage): Don't set call_used_regs when
	making a register fixed.
	* config/mips/mips.h (CALL_USED_REGISTERS): Delete.
	* config/mips/mips.c (mips_global_pointer): Use call_used_regs
	instead of call_really_used_regs.
	(mips_interrupt_extra_call_saved_reg_p): Likewise.
	(mips_cfun_call_saved_reg_p): Likewise.
	(mips_swap_registers): Remove the old handling of call_used_regs
	and change the handling of call_really_used_regs to use call_used_regs
	instead.
	(mips_conditional_register_usage): Likewise.
	* config/mn10300/mn10300.h (CALL_USED_REGISTERS): Delete.
	* config/mn10300/mn10300.c (fp_regs_to_save): Use call_used_regs
	instead of call_really_used_regs.
	(mn10300_get_live_callee_saved_regs): Likewise.
	(mn10300_expand_prologue, mn10300_expand_epilogue): Likewise.
	(mn10300_conditional_register_usage): Don't set call_used_regs when
	making a register fixed.
	* config/rs6000/rs6000.h (CALL_USED_REGISTERS): Delete.
	* config/rs6000/rs6000.c (rs6000_conditional_register_usage):
	Remove the old handling of call_used_regs and change the handling
	of call_really_used_regs to use call_used_regs instead.
	* config/s390/s390.h (CALL_USED_REGISTERS): Delete.
	* config/s390/s390.c (s390_regs_ever_clobbered): Use call_used_regs
	instead of call_really_used_regs.
	(s390_register_info_gprtofpr, s390_register_info): Likewise.
	(s390_hard_regno_rename_ok, s390_hard_regno_scratch_ok): Likewise.
	(s390_emit_prologue, s300_set_up_by_prologue): Likewise.
	(s390_can_use_return_insn, s390_optimize_prologue): Likewise.
	(s390_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/sh/sh.h (CALL_USED_REGISTERS): Delete.
	* config/sh/sh.c (output_stack_adjust, calc_live_regs): Likewise.
	(sh_fix_range, reg_unused_after): Likewise.
	(sh_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/sparc/sparc.h (CALL_USED_REGISTERS): Delete.
	* config/sparc/sparc.c (sparc_conditional_register_usage): Don't set
	call_used_regs when making a register fixed.
	* config/tilegx/tilegx.h (CALL_USED_REGISTERS): Delete.
	* config/tilegx/tilegx.c (tilegx_conditional_register_usage): Don't set
	call_used_regs when making a register fixed.
	* config/tilepro/tilepro.h (CALL_USED_REGISTERS): Delete.
	* config/tilepro/tilepro.c (tilepro_conditional_register_usage): Don't
	set call_used_regs when making a register fixed.
	* config/visium/visium.h (CALL_USED_REGISTERS): Delete.
	* config/visium/visium.c (visium_conditional_register_usage): Remove
	the old handling of call_used_regs and change the handling of
	call_really_used_regs to use call_used_regs instead.

From-SVN: r275605

Now that tests of call_used_regs go through call_used_or_fixed_reg_p,
we can hide call_used_regs from target-independent code.  (It still
needs to be available to targets for the conditional register usage
hooks.)

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (call_used_regs): Only define if IN_TARGET_CODE.
	(call_used_or_fixed_reg_p): Expand definition of call_used_regs.
	* reginfo.c (call_used_regs): New macro.

From-SVN: r275604

This patch removes redundant fixed_regs tests in things like:

  !fixed_regs[i] && !call_used_or_fixed_reg_p (i)

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/alpha/alpha.c (alpha_compute_frame_layout): Remove redundant
	fixed_regs test.
	* config/bpf/bpf.c (bpf_compute_frame_layout, bpf_expand_prologue)
	(bpf_expand_epilogue): Likewise.
	* config/c6x/c6x.c (c6x_save_reg): Likewise.
	* config/ft32/ft32.c (ft32_expand_prologue): Likewise.
	(ft32_expand_epilogue): Likewise.
	* config/i386/i386.c (ix86_save_reg): Likewise.
	* config/moxie/moxie.c (moxie_expand_prologue): Likewise.
	(moxie_expand_epilogue): Likewise.
	* config/tilegx/tilegx.c (need_to_save_reg): Likewise.
	* config/tilepro/tilepro.c (need_to_save_reg): Likewise.
	* config/xtensa/xtensa.c (xtensa_call_save_reg): Likewise.

From-SVN: r275603

Similarly to the call_used_or_fixed_regs patch, this one replaces
tests of call_used_regs[i] with call_used_or_fixed_reg_p (i).
The only remaining direct uses of call_used_regs are in reginfo.c
and in the conditional register usage hooks.

Again, this is purely mechanical.  A later patch will clear up the
oddities in config/ code.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (call_used_or_fixed_reg_p): New macro.
	* cfgloopanal.c (init_set_costs): Use call_used_or_fixed_reg_p
	instead of testing call_used_regs directly.
	* config/aarch64/aarch64.c (aarch64_layout_frame): Likewise.
	(aarch64_components_for_bb): Likewise.
	* config/alpha/alpha.c (alpha_compute_frame_layout): Likewise.
	* config/arc/arc.c (arc_must_save_register): Likewise.
	(arc_epilogue_uses): Likewise.
	* config/arm/arm.c (arm_option_override, use_return_insn): Likewise.
	(legitimize_pic_address, callee_saved_reg_p): Likewise.
	(arm_compute_save_reg0_reg12_mask): Likewise.
	(arm_compute_save_core_reg_mask): Likewise.
	(arm_get_vfp_saved_size, arm_compute_frame_layout): Likewise.
	(arm_save_coproc_regs, thumb1_extra_regs_pushed): Likewise.
	(cmse_nonsecure_entry_clear_before_return): Likewise.
	(thumb1_expand_epilogue, arm_expand_epilogue_apcs_frame): Likewise.
	(arm_expand_epilogue): Likewise.
	* config/avr/avr.c (avr_regs_to_save, sequent_regs_live): Likewise.
	(avr_function_arg_advance, avr_find_unused_d_reg): Likewise.
	(_reg_unused_after): Likewise.
	* config/bfin/bfin.c (must_save_p, expand_prologue_reg_save): Likewise.
	(expand_epilogue_reg_restore, n_regs_saved_by_prologue): Likewise.
	(add_to_reg, hwloop_optimize): Likewise.
	* config/bpf/bpf.c (bpf_compute_frame_layout, bpf_expand_prologue)
	(bpf_expand_epilogue): Likewise.
	* config/c6x/c6x.c (c6x_save_reg, c6x_regno_reg_class): Likewise.
	* config/cr16/cr16.c (cr16_compute_save_regs): Likewise.
	* config/cris/cris.c (cris_reg_saved_in_regsave_area): Likewise.
	* config/epiphany/epiphany.c (epiphany_init_reg_tables): Likewise.
	(epiphany_compute_function_type, MUST_SAVE_REGISTER): Likewise.
	(epiphany_output_mi_thunk, epiphany_start_function): Likewise.
	* config/fr30/fr30.c (fr30_num_arg_regs): Likewise.
	* config/frv/frv.c (frv_stack_info): Likewise.
	* config/ft32/ft32.c (ft32_compute_frame): Likewise.
	(ft32_expand_prologue, ft32_expand_epilogue): Likewise.
	* config/gcn/gcn.c (gcn_compute_frame_offsets): Likewise.
	(move_callee_saved_registers): Likewise.
	* config/h8300/h8300.c (byte_reg): Likewise.
	* config/i386/i386-options.c (ix86_set_current_function): Likewise.
	* config/i386/i386.c (ix86_save_reg, ix86_expand_prologue): Likewise.
	(ix86_expand_epilogue, x86_order_regs_for_local_alloc): Likewise.
	* config/i386/predicates.md (sibcall_memory_operand): Likewise.
	* config/ia64/ia64.c (emit_safe_across_calls, find_gr_spill): Likewise.
	(next_scratch_gr_reg, ia64_compute_frame_size): Likewise.
	* config/iq2000/iq2000.h (MUST_SAVE_REGISTER): Likewise.
	* config/lm32/lm32.c (lm32_compute_frame_size): Likewise.
	* config/m32c/m32c.c (need_to_save): Likewise.
	* config/m68k/m68k.c (m68k_save_reg): Likewise.
	* config/mcore/mcore.c (calc_live_regs): Likewise.
	* config/microblaze/microblaze.c (microblaze_must_save_register):
	Likewise.
	* config/mmix/mmix.c (mmix_local_regno): Likewise.
	(mmix_initial_elimination_offset, mmix_reorg): Likewise.
	(mmix_use_simple_return, mmix_expand_prologue): Likewise.
	(mmix_expand_epilogue): Likewise.
	* config/moxie/moxie.c (moxie_compute_frame): Likewise.
	(moxie_expand_prologue, moxie_expand_epilogue): Likewise.
	* config/msp430/msp430.c (msp430_preserve_reg_p): Likewise.
	* config/nds32/nds32.h (nds32_16bit_address_type): Likewise.
	(NDS32_REQUIRED_CALLEE_SAVED_P): Likewise.
	* config/nios2/nios2.c (prologue_saved_reg_p): Likewise.
	* config/or1k/or1k.c (callee_saved_regno_p): Likewise.
	* config/pa/pa.c (pa_expand_prologue, pa_expand_epilogue): Likewise.
	* config/pdp11/pdp11.c (pdp11_saved_regno): Likewise.
	* config/pru/pru.c (prologue_saved_reg_p): Likewise.
	* config/riscv/riscv.c (riscv_save_reg_p): Likewise.
	(riscv_epilogue_uses, riscv_hard_regno_mode_ok): Likewise.
	* config/rl78/rl78.c (need_to_save): Likewise.
	* config/rs6000/rs6000-logue.c (save_reg_p): Likewise.
	(rs6000_stack_info, generate_set_vrsave): Likewise.
	(rs6000_emit_prologue, rs6000_emit_epilogue): Likewise.
	* config/rs6000/rs6000.c (rs6000_debug_reg_print): Likewise.
	* config/rx/rx.c (rx_get_stack_layout): Likewise.
	* config/s390/s390.c (s390_call_saved_register_used): Likewise.
	* config/sh/sh.c (calc_live_regs, sh_output_mi_thunk): Likewise.
	* config/sparc/sparc.c (save_global_or_fp_reg_p): Likewise.
	(save_local_or_in_reg_p): Likewise.
	* config/stormy16/stormy16.c (REG_NEEDS_SAVE): Likewise.
	(xstormy16_epilogue_uses): Likewise.
	* config/tilegx/tilegx.c (need_to_save_reg): Likewise.
	* config/tilepro/tilepro.c (need_to_save_reg): Likewise.
	* config/v850/v850.c (compute_register_save_size): Likewise.
	* config/vax/vax.c (vax_expand_prologue): Likewise.
	* config/visium/visium.c (visium_save_reg_p): Likewise.
	* config/xtensa/xtensa.c (xtensa_call_save_reg): Likewise.
	* cselib.c (cselib_process_insn): Likewise.
	* df-scan.c (df_get_entry_block_def_set): Likewise.
	* function.c (aggregate_value_p): Likewise.
	* haifa-sched.c (alloc_global_sched_pressure_data): Likewise.
	* ira-lives.c (process_bb_node_lives): Likewise.
	* ira.c (do_reload): Likewise.
	* lra-lives.c (process_bb_lives): Likewise.
	* lra-remat.c (lra_remat): Likewise.
	* lra.c (lra): Likewise.
	* postreload.c (reload_combine_recognize_pattern): Likewise.
	(reload_cse_move2add): Likewise.
	* recog.c (peep2_find_free_register): Likewise.
	* regrename.c (check_new_reg_p): Likewise.
	* reload.c (find_equiv_reg): Likewise.
	* reload1.c (reload, find_reg): Likewise.
	* sel-sched.c (init_hard_regs_data): Likewise.

From-SVN: r275602

This cleans up a couple of places in which the previous patch had:

  call_used_or_fixed_regs & ~fixed_reg_set

In that context, regs_invalidated_by_call is IMO more obvious.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/frv/frv.c (frv_ifcvt_modify_tests): Use
	regs_invalidated_by_call & ~fixed_reg_set instead of
	call_used_or_fixed_regs & ~fixed_reg_set.
	* config/sh/sh.c (output_stack_adjust): Likewise.

From-SVN: r275601

CALL_USED_REGISTERS and call_used_regs infamously contain all fixed
registers (hence the need for CALL_REALLY_USED_REGISTERS etc.).
We try to recover from this to some extent with:

  /* Contains 1 for registers that are set or clobbered by calls.  */
  /* ??? Ideally, this would be just call_used_regs plus global_regs, but
     for someone's bright idea to have call_used_regs strictly include
     fixed_regs.  Which leaves us guessing as to the set of fixed_regs
     that are actually preserved.  We know for sure that those associated
     with the local stack frame are safe, but scant others.  */
  HARD_REG_SET x_regs_invalidated_by_call;

Since global registers are added to fixed_reg_set and call_used_reg_set
too, it's always the case that:

  call_used_reg_set == regs_invalidated_by_call | fixed_reg_set

This patch replaces all uses of call_used_reg_set with a new macro
call_used_or_fixed_regs to make this clearer.

This is part of a series that allows call_used_regs to be what is
now call_really_used_regs.  It's a purely mechanical replacement;
later patches clean up obvious oddities like
"call_used_or_fixed_regs & ~fixed_regs".

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (target_hard_regs::x_call_used_reg_set): Delete.
	(call_used_reg_set): Delete.
	(call_used_or_fixed_regs): New macro.
	* reginfo.c (init_reg_sets_1, globalize_reg): Remove initialization
	of call_used_reg_set.
	* caller-save.c (setup_save_areas): Use call_used_or_fixed_regs
	instead of call_used_regs.
	(save_call_clobbered_regs): Likewise.
	* cfgcleanup.c (old_insns_match_p): Likewise.
	* config/c6x/c6x.c (c6x_call_saved_register_used): Likewise.
	* config/epiphany/epiphany.c (epiphany_conditional_register_usage):
	Likewise.
	* config/frv/frv.c (frv_ifcvt_modify_tests): Likewise.
	* config/sh/sh.c (output_stack_adjust): Likewise.
	* final.c (collect_fn_hard_reg_usage): Likewise.
	* ira-build.c (ira_build): Likewise.
	* ira-color.c (calculate_saved_nregs): Likewise.
	(allocno_reload_assign, calculate_spill_cost): Likewise.
	* ira-conflicts.c (ira_build_conflicts): Likewise.
	* ira-costs.c (ira_tune_allocno_costs): Likewise.
	* ira-lives.c (process_bb_node_lives): Likewise.
	* ira.c (setup_reg_renumber): Likewise.
	* lra-assigns.c (find_hard_regno_for_1, lra_assign): Likewise.
	* lra-constraints.c (need_for_call_save_p): Likewise.
	(need_for_split_p, inherit_in_ebb): Likewise.
	* lra-lives.c (process_bb_lives): Likewise.
	* lra-remat.c (call_used_input_regno_present_p): Likewise.
	* postreload.c (reload_combine): Likewise.
	* regrename.c (find_rename_reg): Likewise.
	* reload1.c (reload_as_needed): Likewise.
	* rtlanal.c (find_all_hard_reg_sets): Likewise.
	* sel-sched.c (mark_unavailable_hard_regs): Likewise.
	* shrink-wrap.c (requires_stack_frame_p): Likewise.

From-SVN: r275600

Reusing the reasoning from the call_fixed_reg_set patch:

  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    for (j = 1; j <= MOVE_MAX_WORDS; j++)
      if (reg_save_code (i,regno_save_mode[i][j]) == -1)

should be true whenever regno_save_mode[i][j] == VOIDmode,
which it is for:

  ~call_used_reg_set | ~have_save_mode

So this condition amounts to:

  ~call_used_reg_set | ~have_save_mode | ~have_save_insn
  == ~call_used_reg_set | ~savable_regs

no_caller_save_reg_set is then set if call_used_regs[i], so
no_caller_save_reg_set is:

  call_used_reg_set & (~call_used_reg_set | ~savable_regs)
  == call_used_reg_set & ~savable_regs

This patch expands its single user accordingly.

Note that ~savable_regs is always empty on LRA targets.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (target_hard_regs::x_no_caller_save_reg_set): Delete.
	(no_caller_save_reg_set): Delete.
	* caller-save.c (init_caller_save): Don't initialize it.
	* ira-conflicts.c (ira_build_conflicts): Calculate
	no_caller_save_reg_set locally from call_used_reg_set and savable_regs.

From-SVN: r275599

On targets that use reload, call_fixed_reg_set is structurally:

  fixed_reg_set                           -- reginfo.c
  | (call_used_reg_set & ~have_save_mode) -- first loop in init_caller_save
  | ~have_save_insn                       -- final loop in init_caller_save

(where "have_save_mode" and "have_save_insn" are just my names).
But the final loop in init_caller_save does:

  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    for (j = 1; j <= MOVE_MAX_WORDS; j++)
      if (reg_save_code (i,regno_save_mode[i][j]) == -1)

This last condition ought to be true whenever:

  regno_save_mode[i][j] == VOIDmode

since either targetm.hard_regno_mode_ok (i, VOIDmode) should be
false or the VOIDmode save & restore shouldn't match any move insn.
And after the first loop, regno_save_mode[i][j] == VOIDmode whenever
!call_used_regs[i].  So the above is actually:

  fixed_reg_set
  | (call_used_reg_set & ~have_save_mode)
  | (~call_used_reg_set | ~have_save_insn)

which simplifies to:

  fixed_reg_set                        -- reginfo.c
  | ~have_save_mode                    -- first loop in init_caller_save
  | ~have_save_insn                    -- final loop in init_caller_save
  | ~call_used_reg_set                 -- final loop in init_caller_save

So:

  ~call_fixed_reg_set == (~fixed_reg_set
		          & have_save_mode
			  & have_save_insn
			  & call_used_reg_set)  [A]

All users have the form:

  (call_used_reg_set or some subset) & ~(call_fixed_reg_set | ...)

i.e.:

  (call_used_reg_set or some subset) & ~call_fixed_reg_set & ~(...)

We can therefore drop the "& call_used_reg_set" from [A], leaving:

  ~fixed_reg_set & have_save_mode & have_save_insn

This patch combines have_save_mode & have_save_insn into a single
condition "a save is possible", represented as savable_regs.
We can then substitute:

  ~call_fixed_reg_set --> ~fixed_reg_set & savable_regs
                          (registers we can actually save around calls)

The patch also sets regno_save_mode[i][j] for all registers,
in case non-default ABIs require a save when the default ABI
doesn't.  This ensures that savable_regs (like fixed_reg_set but
unlike call_fixed_reg_set) isn't affected by the ABI.  This only
becomes significant with later patches and at this point is just
a simplification.

Since init_caller_save is only called for reload targets,
the default assumption for LRA is that all registers are savable,
just like the default assumption before the patch was that
(~)call_fixed_reg_set == (~)fixed_reg_set.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (target_hard_regs::x_call_fixed_reg_set): Delete.
	(target_hard_regs::x_savable_regs): New field.
	(call_fixed_reg_set): Delete.
	(savable_regs): New macro,
	* reginfo.c (globalize_reg): Don't set call_fixed_reg_set.
	(init_reg_sets_1): Likewise.  Initialize savable_regs.
	* caller-save.c (init_caller_save): Invoke HARD_REGNO_CALLER_SAVE_MODE
	for all registers.  Set savable_regs instead of call_fixed_reg_set.
	(setup_save_areas, save_call_clobbered_regs): Replace uses of
	~call_fixed_reg_set with ~fixed_reg_set & savable_regs.
	* config/sh/sh.c (output_stack_adjust): Likewise.

From-SVN: r275598

I have a series of patches that hides call_used_regs from target-
independent code, a knock-on effect of which is that (public) target
macros can't use call_used_regs either.  This patch fixes the only
case in which that was a problem.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/c6x/c6x-protos.h (c6x_set_return_address): Declare.
	* config/c6x/c6x.h (REGNO_REG_CLASS): Move implementation to
	* config/c6x/c6x.c (c6x_regno_reg_class): ...this new function.

From-SVN: r275597

	* include/std/type_traits (__do_common_type_impl): Implement
	additional COND-RES(CREF(D1), CRED(D2)) condition for C++20.
	(basic_common_reference, common_reference, common_reference_t): Define
	for C++20.
	* testsuite/20_util/common_reference/requirements/alias_decl.cc: New
	test.
	* testsuite/20_util/common_reference/requirements/
	explicit_instantiation.cc: New test.
	* testsuite/20_util/common_reference/requirements/typedefs.cc: New
	test.

From-SVN: r275594

Only one caller (in dwarf2out.c) was preventing get_call_rtx_from
from taking an rtx_insn *.  Since that caller just passes a PATTERN,
it's a trivial change to make.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* rtl.h (get_call_rtx_from): Take a const rtx_insn * instead of an rtx.
	* rtlanal.c (get_call_rtx_from): Likewise.
	* dwarf2out.c (dwarf2out_var_location): Pass the insn rather
	than the pattern to get_call_rtx_from.
	* config/i386/i386-expand.h (ix86_notrack_prefixed_insn_p): Take
	an rtx_insn * instead of an rtx.
	* config/i386/i386-expand.c (ix86_notrack_prefixed_insn_p): Likewise.

From-SVN: r275593

2019-09-10  Martin Liska  <mliska@suse.cz>

	* common.opt: Use newly added WarnRemoved.
	* config/aarch64/aarch64.opt: Likewise.
	* config/arm/arm.opt: Likewise.
	* config/i386/i386.opt: Likewise.
	* config/ia64/ia64.opt: Likewise.
	* config/rs6000/rs6000.opt: Likewise.
	* doc/options.texi: Document WarnRemoved properly.
	* dwarf2out.c (gen_producer_string): Handle renamed
	OPT_SPECIAL_warn_removed.
	* lto-opts.c (lto_write_options): Likewise.
	* lto-wrapper.c (merge_and_complain): Likewise.
	* opts-common.c (decode_cmdline_option): Likewise.
	(prune_options): Likewise.
	(read_cmdline_option): Likewise.
	(control_warning_option): Likewise.
	* opts.c (print_filtered_help): Likewise.
	* optc-gen.awk: Parse for WarnRemoved and make usage
	of Deprecated an error.
	* opth-gen.awk: Generate new OPT_SPECIAL_warn_removed.
2019-09-10  Martin Liska  <mliska@suse.cz>

	* c.opt: Use newly added WarnRemoved.

From-SVN: r275592

        * gfortran.dg/default_format_1.f90: Remove XFAIL AIX.
        * gfortran.dg/default_format_denormal_1.f90: Same.

From-SVN: r275591

From-SVN: r275589

The standard requires overloads of std::to_chars for char and (un)signed
integer types. This means that our constrained function template is
non-conforming, because the difference is observable when using types
that convert to an integer (e.g. wchar_t, which promotes).

As well as defining the deleted bool overload for LWG 3266, replace the
constrained function template with overloads for each type.

	* include/std/charconv (to_chars): Rename to __to_chars_i. Define
	non-template overloads for each signed and unsigned integer type and
	char. Define deleted overload for bool (LWG 3266).
	* testsuite/20_util/to_chars/1_neg.cc: Remove.
	* testsuite/20_util/to_chars/3.cc: New test.
	* testsuite/20_util/to_chars/lwg3266.cc: New test.

From-SVN: r275588

	PR middle-end/91680
	* match.pd ((A / (1 << B)) -> (A >> B)): Allow widening cast from
	the shift type to type.

	* gcc.dg/tree-ssa/pr91680.c: New test.
	* g++.dg/torture/pr91680.C: New test.

From-SVN: r275587

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

        libstdc++-v3/
    	* acinclude.m4: Handle uclinux*.
    	* configure: Regenerate.
    	* configure.host: Handle uclinux*

From-SVN: r275586

/cp
2019-09-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (has_designator_problem): Use cp_expr_loc_or_input_loc
	in error_at.
	(build_enumerator): Likewise.
	(cp_finish_decl): Use DECL_SOURCE_LOCATION.
	(grokdeclarator): Use id_loc in two error_at; change errror
	message about constinit together constexpr to use two ranges.

/testsuite
2019-09-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/cpp0x/enum29.C: Test location(s) too.
	* g++.dg/cpp0x/lambda/lambda-ice10.C: Likewise.
	* g++.dg/cpp2a/constinit3.C: Likewise.
	* g++.dg/ext/desig4.C: Likewise.
	* g++.dg/ext/label10.C: Likewise.
	* g++.old-deja/g++.other/dtor3.C: Likewise.

From-SVN: r275585

The ldaddr macro in sjlj.S needs to be updated to support the FDPIC
model.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	libitm/
	* config/arm/sjlj.S (ldaddr): Add FDPIC support.

From-SVN: r275584

Since FDPIC does not support -static, skip the related tests.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_static): Disable
	for ARM FDPIC target.

From-SVN: r275583

The recent stack_protect_combined_set_insn and
stack_protect_combined_test_insn force recomputing of GOT base, but
need to take into account that in FDPIC mode, the PIC register is
fixed by the ABI (r9).

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/
	* config/arm/arm.md (stack_protect_combined_set_insn): Handle
	FDPIC mode.
	(stack_protect_combined_test_insn): Likewise.

From-SVN: r275582

uclibc defines bswap_32, so use a different name in this test.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/testsuite/
	* gcc.target/arm/pr43698.c (bswap_32): Rename as my_bswap_32.

From-SVN: r275581

Some tests have the "nonpic" guard, but pass on
arm*-*-uclinuxfdpiceabi because it is in PIE mode by default. Rather
than adding this target to all these tests, add the "pie_enabled"
effective target.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/testsuite/
	* g++.dg/cpp0x/noexcept03.C: Add pie_enabled.
	* g++.dg/ipa/devirt-c-7.C: Likewise.
	* g++.dg/ipa/ivinline-1.C: Likewise.
	* g++.dg/ipa/ivinline-2.C: Likewise.
	* g++.dg/ipa/ivinline-3.C: Likewise.
	* g++.dg/ipa/ivinline-4.C: Likewise.
	* g++.dg/ipa/ivinline-5.C: Likewise.
	* g++.dg/ipa/ivinline-7.C: Likewise.
	* g++.dg/ipa/ivinline-8.C: Likewise.
	* g++.dg/ipa/ivinline-9.C: Likewise.
	* g++.dg/tls/pr79288.C: Likewise.
	* gcc.dg/addr_equal-1.c: Likewise.
	* gcc.dg/const-1.c: Likewise.
	* gcc.dg/ipa/pure-const-1.c: Likewise.
	* gcc.dg/noreturn-8.c: Likewise.
	* gcc.dg/pr33826.c: Likewise.
	* gcc.dg/torture/ipa-pta-1.c: Likewise.
	* gcc.dg/tree-ssa/alias-2.c: Likewise.
	* gcc.dg/tree-ssa/ipa-split-5.c: Likewise.
	* gcc.dg/tree-ssa/loadpre6.c: Likewise.
	* gcc.dg/uninit-19.c: Likewise.

From-SVN: r275580

Add *-*-uclinux* to tests that work on this target.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/testsuite/
	* g++.dg/abi/forced.C: Add *-*-uclinux*.
	* g++.dg/abi/guard2.C: Likewise.
	* g++.dg/ext/cleanup-10.C: Likewise.
	* g++.dg/ext/cleanup-11.C: Likewise.
	* g++.dg/ext/cleanup-8.C: Likewise.
	* g++.dg/ext/cleanup-9.C: Likewise.
	* g++.dg/ext/sync-4.C: Likewise.
	* g++.dg/ipa/comdat.C: Likewise.
	* gcc.dg/20041106-1.c: Likewise.
	* gcc.dg/cleanup-10.c: Likewise.
	* gcc.dg/cleanup-11.c: Likewise.
	* gcc.dg/cleanup-8.c: Likewise.
	* gcc.dg/cleanup-9.c: Likewise.
	* gcc.dg/fdata-sections-1.c: Likewise.
	* gcc.dg/fdata-sections-2.c: Likewise.
	* gcc.dg/pr39323-1.c: Likewise.
	* gcc.dg/pr39323-2.c: Likewise.
	* gcc.dg/pr39323-3.c: Likewise.
	* gcc.dg/pr65780-1.c: Likewise.
	* gcc.dg/pr65780-2.c: Likewise.
	* gcc.dg/pr67338.c: Likewise.
	* gcc.dg/pr78185.c: Likewise.
	* gcc.dg/pr83100-1.c: Likewise.
	* gcc.dg/pr83100-4.c: Likewise.
	* gcc.dg/strlenopt-12g.c: Likewise.
	* gcc.dg/strlenopt-14g.c: Likewise.
	* gcc.dg/strlenopt-14gf.c: Likewise.
	* gcc.dg/strlenopt-16g.c: Likewise.
	* gcc.dg/strlenopt-17g.c: Likewise.
	* gcc.dg/strlenopt-18g.c: Likewise.
	* gcc.dg/strlenopt-1f.c: Likewise.
	* gcc.dg/strlenopt-22g.c: Likewise.
	* gcc.dg/strlenopt-2f.c: Likewise.
	* gcc.dg/strlenopt-31g.c: Likewise.
	* gcc.dg/strlenopt-33g.c: Likewise.
	* gcc.dg/strlenopt-4g.c: Likewise.
	* gcc.dg/strlenopt-4gf.c: Likewise.
	* gcc.dg/strncmp-2.c: Likewise.
	* gcc.dg/struct-ret-3.c: Likewise.
	* gcc.dg/torture/pr69760.c: Likewise.
	* gcc.target/arm/div64-unwinding.c: Likewise.
	* gcc.target/arm/stack-checking.c: Likewise.
	* gcc.target/arm/synchronize.c: Likewise.
	* gcc.target/arm/pr66912.c: Add arm*-*-uclinuxfdpiceabi.
	* lib/target-supports.exp (check_effective_target_pie): Likewise.
	(check_effective_target_sync_long_long_runtime): Likewise.
	(check_effective_target_sync_int_long): Likewise.
	(check_effective_target_sync_char_short): Likewise.

From-SVN: r275579

Some tests fail on arm*-*-uclinuxfdpiceabi because it generates PIC
code and they don't support it: skip them. They also fail on
arm*-linux* when forcing -fPIC.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	gcc/testsuite/
	* gcc.target/arm/eliminate.c: Accept only nonpic targets.
	* g++.dg/other/anon5.C: Likewise.

From-SVN: r275578

In FDPIC mode, r9 is saved in addition to other registers, so update
the expected patterns accordingly.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>
	Mickaël Guêné <mickael.guene@st.com>

	gcc/testsuite/
	* gcc.target/arm/interrupt-1.c: Add scan-assembler pattern for
	arm*-*-uclinuxfdpiceabi.
	* gcc.target/arm/interrupt-2.c: Likewise.
	* gcc.target/arm/pr70830.c: Likewise.


Co-Authored-By: Mickaël Guêné <mickael.guene@st.com>

From-SVN: r275577