From-SVN: r277209

nodiscard-reason-only-one.C: In dg-error or dg-warning remove (?n) uses and replace .* with \[^\n\r]*.

	* g++.dg/cpp2a/nodiscard-reason-only-one.C: In dg-error or dg-warning
	remove (?n) uses and replace .* with \[^\n\r]*.
	* g++.dg/cpp2a/nodiscard-reason.C: Likewise.
	* g++.dg/cpp2a/nodiscard-once.C: Likewise.
	* g++.dg/cpp2a/nodiscard-reason-nonstring.C: Likewise.

From-SVN: r277205

2019-10-19  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/91926
	* runtime/ISO_Fortran_binding.c (cfi_desc_to_gfc_desc): Revert
	the change made on 2019-10-05.

From-SVN: r277204

	PR target/92140
	* config/i386/predicates.md (int_nonimmediate_operand): New special
	predicate.
	* config/i386/i386.md (*add<mode>3_eq, *add<mode>3_ne,
	*add<mode>3_eq_0, *add<mode>3_ne_0, *sub<mode>3_eq, *sub<mode>3_ne,
	*sub<mode>3_eq_1, *sub<mode>3_eq_0, *sub<mode>3_ne_0): New
	define_insn_and_split patterns.

	* gcc.target/i386/pr92140.c: New test.
	* gcc.c-torture/execute/pr92140.c: New test.

Co-Authored-By: Uros Bizjak <ubizjak@gmail.com>

From-SVN: r277203

Darwin does not mark entries in string.h with nonnull attributes
so the test fails.  Since the purpose of the test is to check that
the warnings are issued for an inlined function, not that the target
headers are marked up, we can provide marked up headers for Darwin.

gcc/testsuite/ChangeLog:

2019-10-19  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.dg/Wnonnull.c: Add attributed function declarations for
	memcpy and strlen for Darwin.

From-SVN: r277202

Removes a comment that's no longer relevant.

gcc/ChangeLog:

2019-10-19  Iain Sandoe  <iain@sandoe.co.uk>

	* config/rs6000/rs6000.md: Delete out--of-date comment about
	special-casing integer loads.

From-SVN: r277201

2019-10-17  JeanHeyd Meneide  <phdofthehouse@gmail.com>

gcc/
        * escaped_string.h (escaped_string): New header.
        * tree.c (escaped_string): Remove escaped_string class.

gcc/c-family
        * c-lex.c (c_common_has_attribute): Update nodiscard value.

gcc/cp/
        * tree.c (handle_nodiscard_attribute) Added C++2a nodiscard
	string message.
        (std_attribute_table) Increase nodiscard argument handling
	max_length from 0 to 1.
        * parser.c (cp_parser_check_std_attribute): Add requirement
	that nodiscard only be seen once in attribute-list.
        (cp_parser_std_attribute): Check that empty parenthesis lists are
        not specified for attributes that have max_length > 0 (e.g.
	[[attr()]]).
        * cvt.c (maybe_warn_nodiscard): Add nodiscard message to
	output, if applicable.
	(convert_to_void): Allow constructors to be nodiscard-able (P1771).

gcc/testsuite/g++.dg/cpp0x
        * gen-attrs-67.C: Test new error message for empty-parenthesis-list.

gcc/testsuite/g++.dg/cpp2a
        * nodiscard-construct.C: New test.
        * nodiscard-once.C: New test.
        * nodiscard-reason-nonstring.C: New test.
        * nodiscard-reason-only-one.C: New test.
        * nodiscard-reason.C: New test.

Reviewed-by: Jason Merrill <jason@redhat.com>

From-SVN: r277200

From-SVN: r277199

gcc/testsuite/ChangeLog:

	PR tree-optimization/92157
	* gcc.dg/strlenopt-69.c: Disable test failing due to PR 92155.
	* gcc.dg/strlenopt-87.c: New test.

gcc/ChangeLog:

	PR tree-optimization/92157
	* tree-ssa-strlen.c (handle_builtin_string_cmp): Be prepared for
	compute_string_length to return a negative result.

From-SVN: r277194

In thumb2 we now generate a NEGS instruction rather than RSBS, so this
test needs updating.

	* gcc.target/arm/negdi-3.c: Update expected output to allow NEGS.

From-SVN: r277192

The generic expansion code for negv does not try the subv patterns,
but instead emits a sub and a compare separately.  Fortunately, the
patterns can make use of the new subv operations, so just call those.
We can also rewrite this using an iterator to simplify things further.
Finally, we can now make negvdi4 work on Thumb2 as well as Arm.

	* config/arm/arm.md (negv<SIDI:mode>3): New expansion rule.
	(negvsi3, negvdi3): Delete.
	(negdi2_compare): Delete.

From-SVN: r277191

This patch adds early expansion of subvdi4.  The expansion sequence
is broadly based on the expansion of usubvdi4.

	* config/arm/arm.md (subvdi4): Decompose calculation into 32-bit
	operations.
	(subdi3_compare1): Delete pattern.
	(subvsi3_borrow): New insn pattern.
	(subvsi3_borrow_imm): Likewise.

From-SVN: r277190

This patch addresses constant handling in subvsi4.  Either operand may
be a constant.  If the second input (operand[2]) is a constant, then
we can canonicalize this into an addition form, providing we take care
of the INT_MIN case.  In that case the negation has to handle the fact
that -INT_MIN is still INT_MIN and we need to ensure that a subtract
operation is performed rather than an addition.  The remaining cases
are largely duals of the usubvsi4 expansion.

This patch also fixes a technical correctness bug in the old
expansion, where we did not realy describe the test for overflow in
the RTL.  We seem to have got away with that, however...

	* config/arm/arm.md (subv<mode>4): Delete.
	(subvdi4): New expander pattern.
	(subvsi4): Likewise.  Handle some immediate values.
	(subvsi3_intmin): New insn pattern.
	(subvsi3): Likewise.
	(subvsi3_imm1): Likewise.
	* config/arm/arm.c (select_cc_mode): Also allow minus for CC_V
	idioms.

From-SVN: r277189

This patch adds early expansion of usubvdi4, allowing us to handle some
constants in place, which previously we were unable to do.

	* config/arm/arm.md (usubvdi4): Allow registers or integers for
	incoming operands.  Early split the calculation into SImode
	operations.
	(usubvsi3_borrow): New insn pattern.
	(usubvsi3_borrow_imm): Likewise.

From-SVN: r277188

This patch improves the expansion of usubvsi4 by allowing suitable
constants to be passed directly.  Unlike normal subtraction, either
operand may be a constant (and indeed I have seen cases where both can
be with LTO enabled).  One interesting testcase that improves as a
result of this is:

unsigned f6 (unsigned a)
{
  unsigned x;
  return __builtin_sub_overflow (5U, a, &x) ? 0 : x;
}

Which previously compiled to:

	rsbs	r3, r0, #5
	cmp	r0, #5
	movls	r0, r3
	movhi	r0, #0

but now generates the optimal sequence:

	rsbs	r0, r0, #5
	movcc	r0, #0

	* config/arm/arm.md (usubv<mode>4): Delete expansion.
	(usubvsi4): New pattern.  Allow some immediate values for inputs.
	(usubvdi4): New pattern.

From-SVN: r277187

This patch adds early splitting for addvdi4; it's very similar to the
uaddvdi4 splitter, but the details are just different enough in
places, especially for the patterns that match the splitting, where we
have to compare against the non-widened version to detect if overflow
occurred.

I've also added a testcase to the testsuite for a couple of constants
that caught me out during the development of this patch.  They're
probably arm-specific values, but the test is generic enough that I've
included it for all targets.

[gcc]
	* config/arm/arm.c (arm_select_cc_mode): Allow either the first
	or second operand of the PLUS inside a DImode equality test to be
	sign-extend when selecting CC_Vmode.
	* config/arm/arm.md (addvdi4): Early-split the operation into SImode
	instructions.
	(addsi3_cin_vout_reg, addsi3_cin_vout_imm, addsi3_cin_vout_0): New
	expand patterns.
	(addsi3_cin_vout_reg_insn, addsi3_cin_vout_imm_insn): New patterns.
	(addsi3_cin_vout_0): Likewise.
	(adddi3_compareV): Delete.

[gcc/testsuite]
	* gcc.dg/builtin-arith-overflow-3.c: New test.

From-SVN: r277186

This patch matches the signed add-with-overflow patterns when the
summation itself is dropped.  In this case we can use CMN (or CMP with
some immediates).  There are a small number of constants in thumb2
where this can result in less dense code (as we lack 16-bit CMN with
immediate patterns).  To handle this we use peepholes to try these
alternatives when either a scratch is available (0 <= i <= 7) or the
original register is dead (0 <= i <= 255).  We don't use a scratch in
the pattern as if those conditions are not satisfied then the 32-bit
form is preferable to forcing a reload.

	* config/arm/arm.md (addsi3_compareV_reg_nosum): New insn.
	(addsi3_compareV_imm_nosum): New insn.  Also add peephole2 patterns
	to transform this back into the summation version when that leads
	to smaller code.

From-SVN: r277185

Similar to the improvements for uaddvsi4, this patch improves the code
generation for addvsi4 to handle immediates and to add alternatives
that better target thumb2.  To do this we separate out the expansion
of uaddvsi4 from that of uaddvdi4 and then add an additional pattern
to handle constants.  Also, while doing this I've fixed the incorrect
usage of NE instead of COMPARE in the generated RTL.

	* config/arm/arm.md (addv<mode>4): Delete.
	(addvsi4): New pattern.  Handle immediate values that the architecture
	supports.
	(addvdi4): New pattern.
	(addsi3_compareV): Rename to ...
	(addsi3_compareV_reg): ... this.  Add constraints for thumb2 variants
	and use COMPARE rather than NE.
	(addsi3_compareV_imm): New pattern.
	* config/arm/arm.c (arm_select_cc_mode): Return CC_Vmode for
	a signed-overflow check.

From-SVN: r277184

This code borrows strongly on the uaddvti4 expansion for aarch64 since
the principles are similar.  Firstly, if the one of the low words of
the expansion is 0, we can simply copy the other low word to the
destination and use uaddvsi4 for the upper word.  If that doesn't work
we have to handle three possible cases for the upper work (the lower
word is simply an add-with-carry operation as for adddi3): zero in the
upper word, some other constant and a register (each has a different
canonicalization).  We use CC_ADCmode (a new CC mode variant) to
describe the cases as the introduction of the carry means we can
no-longer use the normal overflow trick of comparing the sum against
one of the operands.

	* config/arm/arm-modes.def (CC_ADC): New CC mode.
	* config/arm/arm.c (arm_select_cc_mode): Detect selection of
	CC_ADCmode.
	(maybe_get_arm_condition_code): Handle CC_ADCmode.
	* config/arm/arm.md (uaddvdi4): Early expansion of unsigned addition
	with overflow.
	(addsi3_cin_cout_reg, addsi3_cin_cout_imm, addsi3_cin_cout_0): New
	expand patterns.
	(addsi3_cin_cout_reg_insn, addsi3_cin_cout_0_insn): New insn patterns
	(addsi3_cin_cout_imm_insn): Likewise.
	(adddi3_compareC): Delete insn.
	* config/arm/predicates.md (arm_carry_operation): Handle CC_ADCmode.

From-SVN: r277183

The uaddv patterns in the arm back-end do not currenty handle immediates
during expansion.  This patch adds this support for uaddvsi4.  It's really
a stepping-stone towards early expansion of uaddvdi4, but it complete and
a useful change in its own right.

Whilst making this change I also observed that we really had two patterns
that did exactly the same thing, but with slightly different properties;
consequently I've cleaned up all of the add-and-compare patterns to bring
some consistency.

	* config/arm/arm.md (adddi3): Call gen_addsi3_compare_op1.
	* (uaddv<mode>4): Delete expansion pattern.
	(uaddvsi4): New pattern.
	(uaddvdi4): Likewise.
	(addsi3_compareC): Delete pattern, change callers to use
	addsi3_compare_op1.
	(addsi3_compare_op1): No-longer anonymous.  Clean up constraints to
	reduce the number of alternatives and re-work type attribute handling.
	(addsi3_compare_op2): Clean up constraints to reduce the number of
	alternatives and re-work type attribute handling.
	(compare_addsi2_op0): Likewise.
	(compare_addsi2_op1): Likewise.

From-SVN: r277182

Now that all the major patterns for DImode have been converted to
early expansion, we can safely clean up some dead code for the old way
of handling DImode.

	* config/arm/arm-modes.def (CC_NCV, CC_CZ): Delete CC modes.
	* config/arm/arm.c (arm_select_cc_mode): Remove old selection code
	for DImode operands.
	(arm_gen_dicompare_reg): Remove unreachable expansion code.
	(maybe_get_arm_condition_code): Remove support for CC_CZmode and
	CC_NCVmode.
	* config/arm/arm.md (arm_cmpdi_insn): Delete.
	(arm_cmpdi_unsigned): Delete.

From-SVN: r277181

In a small number of cases it is preferable to handle comparisons with
constants using the sequence

	RSBS	tmp, Xlo, constlo
	RSCS	tmp, Xhi, consthi

which allows us to handle a small number of LE/GT/LEU/GEU cases when
changing the code to use LT/GE/LTU/GEU would make the constant more
expensive.  Sadly, we cannot do this on Thumb, since we need RSC, so we
now always use the incremented constant in that case since normally that
still works out cheaper than forcing the entire constant into a register.

Further investigation has also shown that the canonicalization of a
reverse subtract and compare is valid for signed as well as unsigned value,
so we relax the restriction on selecting CC_RSBmode to allow all types
of compare.

	* config/arm/arm.c (arm_const_double_prefer_rsbs_rsc): New function.
	(arm_canonicalize_comparison): For GT/LE/GTU/GEU, use the constant
	unchanged only if that will be cheaper.
	(arm_select_cc_mode): Recognize a swapped comparison that will
	be regenerated using RSBS or RSCS.  Relax restriction on selecting
	CC_RSBmode.
	(arm_gen_dicompare_reg): Handle LE/GT/LEU/GEU comparisons against
	a constant.
	(arm_gen_compare_reg): Handle compare (CONST, X) when the mode
	is CC_RSBmode.
	(maybe_get_arm_condition_code): CC_RSBmode now returns the same codes
	as CCmode.
	* config/arm/arm.md (rsb_imm_compare_scratch): New pattern.
	(rscsi3_<CC_EXTEND>out_scratch): New pattern.

From-SVN: r277180

This patch does most of the work for early splitting the DImode
comparisons.  We now handle EQ, NE, LT, GE, LTU and GEU during early
expansion, in addition to EQ and NE, for which the expansion has now
been reworked to use a standard conditional-compare pattern already in
the back-end.

To handle this we introduce two new condition flag modes that are used
when comparing the upper words of decomposed DImode values: one for
signed, and one for unsigned comparisons.  CC_Bmode (B for Borrow) is
essentially the inverse of CC_Cmode and is used when the carry flag is
set by a subtraction of unsigned values.

	* config/arm/arm-modes.def (CC_NV, CC_B): New CC modes.
	* config/arm/arm.c (arm_select_cc_mode): Recognize constructs that
	need these modes.
	(arm_gen_dicompare_reg): New code to early expand the sub-operations
	of EQ, NE, LT, GE, LTU and GEU.
	* config/arm/iterators.md (CC_EXTEND): New code attribute.
	* config/arm/predicates.md (arm_adcimm_operand): New predicate..
	* config/arm/arm.md (cmpsi3_carryin_<CC_EXTEND>out): New pattern.
	(cmpsi3_imm_carryin_<CC_EXTEND>out): Likewise.
	(cmpsi3_0_carryin_<CC_EXTEND>out): Likewise.

From-SVN: r277179

In almost all cases it is better to handle inequality handling against constants
by transforming comparisons of the form (reg <GE/LT/GEU/LTU> const) into
(reg <GT/LE/GTU/LEU> (const+1)).  However, there are many cases that we could
handle but currently failed to do so because we forced the constant into a
register too early in the pattern expansion.  To permit this to be done we need
to defer forcing the constant into a register until after we've had the chance
to do the transform - in some cases that may even mean that we no-longer need
to force the constant into a register at all.  For example, on Arm, the case:

_Bool f8 (unsigned long long a) { return a > 0xffffffff; }

previously compiled to

        mov     r3, #0
        cmp     r1, r3
        mvn     r2, #0
        cmpeq   r0, r2
        movhi   r0, #1
        movls   r0, #0
        bx      lr

But now compiles to

        cmp     r1, #1
        cmpeq   r0, #0
        movcs   r0, #1
        movcc   r0, #0
        bx      lr

Which although not yet completely optimal, is certainly better than
previously.

	* config/arm/arm.md (cbranchdi4): Accept reg_or_int_operand for
	operand 2.
	(cstoredi4): Similarly, but for operand 3.
	* config/arm/arm.c (arm_canoncialize_comparison): Allow canonicalization
	of unsigned compares with a constant on Arm.  Prefer using const+1 and
	adjusting the comparison over swapping the operands whenever the
	original constant was not valid.
	(arm_gen_dicompare_reg): If Y is not a valid operand, force it to a
	register here.
	(arm_validize_comparison): Do not force invalid DImode operands to
	registers here.

From-SVN: r277178

This is the first step of early splitting all the DImode comparison
operations.  We start by factoring the DImode handling out of
arm_gen_compare_reg into its own function.

Simple DImode equality comparisions (such as equality with zero, or
equality with a constant that is zero in one of the two word values
that it comprises) can be done using a single subtract followed by an
ORRS instruction.  This avoids the need for conditional execution.

For example, (r0 != 5) can be written as

	SUB	Rt, R0, #5
	ORRS	Rt, Rt, R1

The ORRS is now expanded using an SImode pattern that already exists
in the MD file and this gives the register allocator more freedom to
select registers (consecutive pairs are no-longer required).
Furthermore, we can then delete the arm_cmpdi_zero pattern as it is
no-longer required.  We use SUB for the value adjustment as this has a
generally more flexible range of immediates than XOR and what's more
has the opportunity to be relaxed in thumb2 to a 16-bit SUBS
instruction.

	* config/arm/arm.c (arm_select_cc_mode): For DImode equality tests
	return CC_Zmode if comparing against a constant where one word is
	zero.
	(arm_gen_compare_reg): Split DImode handling to ...
	(arm_gen_dicompare_reg): ... here.  Handle equality comparisons
	against simple constants.
	* config/arm/arm.md (arm_cmpdi_zero): Delete pattern.

From-SVN: r277177

This patch adds a couple of alternative canonicalizations to allow
combine to match a subtract-with-carry operation when one of the operands
is shifted first.  The most common case of this is when combining a
sign-extend of one operand with a long-long value during subtraction.
The RSC variant is only enabled for Arm, the SBC variant for any 32-bit
compilation.

	* config/arm/arm.md (subsi3_carryin_shift_alt): New pattern.
	(rsbsi3_carryin_shift_alt): Likewise.

From-SVN: r277176

When the carry flag is appropriately set by a comprison, negscc
patterns can expand into a simple SBC of a register with itself.  This
means we can convert two conditional instructions into a single
non-conditional instruction.  Furthermore, in Thumb2 we can avoid the
need for an IT instruction as well.  This patch also fixes the remaining
testcase that we initially XFAILed in the first patch of this series.

gcc:
	* config/arm/arm.md (negscc_borrow): New pattern.
	(mov_negscc): Don't split if the insn would match negscc_borrow.
	* config/arm/thumb2.md (thumb2_mov_negscc): Likewise.
	(thumb2_mov_negscc_strict_it): Likewise.

testsuite:
	* gcc.target/arm/negdi-3.c: Remove XFAIL markers.

From-SVN: r277175

Consider this sequence during combine:

Trying 18, 7 -> 22:
   18: r118:SI=r122:SI
      REG_DEAD r122:SI
    7: r114:SI=0x1-r118:SI-ltu(cc:CC_RSB,0)
      REG_DEAD r118:SI
      REG_DEAD cc:CC_RSB
   22: r1:SI=r114:SI
      REG_DEAD r114:SI
Failed to match this instruction:
(set (reg:SI 1 r1 [+4 ])
    (minus:SI (geu:SI (reg:CC_RSB 100 cc)
            (const_int 0 [0]))
        (reg:SI 122)))
Successfully matched this instruction:
(set (reg:SI 114)
    (geu:SI (reg:CC_RSB 100 cc)
        (const_int 0 [0])))
Successfully matched this instruction:
(set (reg:SI 1 r1 [+4 ])
    (minus:SI (reg:SI 114)
        (reg:SI 122)))
allowing combination of insns 18, 7 and 22
original costs 4 + 4 + 4 = 12
replacement costs 8 + 4 = 12

The costs are all correct, but we really don't want this combination
to take place.  The original costs contain an insn that is a simple
move of one pseudo register to another and it is extremely likely that
register allocation will eliminate this insn entirely.  On the other
hand, the resulting sequence really does expand into a sequence that
costs 12 (ie 3 insns).

We don't want to prevent combine from eliminating such moves, as this
can expose more combine opportunities, but we shouldn't rate them as
profitable in themselves.  We can do this be adjusting the costs
slightly so that the benefit of eliminating such a simple insn is
reduced.

We only do this before register allocation; after allocation we give
such insns their full cost.

	* config/arm/arm.c (arm_insn_cost): New function.
	(TARGET_INSN_COST): Override default definition.

From-SVN: r277174

The rtx_cost calculations when a borrow operation was being performed were
not being calculated correctly.  The borrow is free as part of the
subtract-with-carry instructions.  This patch recognizes the various
idioms that can describe this and returns the correct costs.

	* config/arm/arm.c (arm_rtx_costs_internal, case MINUS): Handle
	borrow operations.

From-SVN: r277173

The cost routine for Arm and Thumb2 was not recognising the idioms that
describe the addition with carry, this results in the instructions
appearing more expensive than they really are, which occasionally can lead
to poor choices by combine.  Recognising all the possible variants is
a little trickier than normal because the expressions can become complex
enough that this is no single canonical from.

	* config/arm/arm.c (strip_carry_operation): New function.
	(arm_rtx_costs_internal, case PLUS): Handle addtion with carry-in
	for SImode.

From-SVN: r277172

An earlier patch introduced arm_borrow_operation, this one introduces
the carry variant, which is the same except that the logic of the
carry-setting is inverted.  Having done this we can now match more
cases where the carry flag is propagated from comparisons with
different modes without having to define even more patterns.  A few
small changes to the expand patterns are required to directly create
the carry representation.

The iterators LTUGEU is no-longer needed and removed, as is the code
attribute 'cnb'.

Finally, we fix a long-standing bug which was probably inert before:
in Thumb2 a shift with ADC can only be by an immediate amount;
register-specified shifts are not permitted.

	* config/arm/predicates.md (arm_carry_operation): New special
	predicate.
	* config/arm/iterators.md (LTUGEU): Delete iterator.
	(cnb): Delete code attribute.
	(optab): Delete ltu and geu elements.
	* config/arm/arm.md (addsi3_carryin): Renamed from
	addsi3_carryin_<optab>.  Remove iterator and use arm_carry_operand.
	(add0si3_carryin): Similarly, but from add0si3_carryin_<optab>.
	(addsi3_carryin_alt2): Similarly, but from addsi3_carryin_alt2_<optab>.
	(addsi3_carryin_clobercc): Similarly.
	(addsi3_carryin_shift): Similarly.  Do not allow register shifts in
	Thumb2 state.

From-SVN: r277171

Now that we early split DImode subtracts, the patterns to emit the
original and to match zero-extend with subtraction or negation are
no-longer useful.

	* config/arm/arm.md (arm_subdi3): Delete insn.
	(zextendsidi_negsi, negdi_extendsidi): Delete insn_and_split.

From-SVN: r277170

This patch adds early splitting of subdi3 so that the individual
operations can be seen by the optimizers, particuarly combine.  This
should allow us to do at least as good a job as previously, but with
far fewer patterns in the machine description.

This is just the initial patch to add the early splitting.  The
cleanups will follow later.

A special trick is used to handle the 'reverse subtract and compare'
where a register is subtracted from a constant.  The natural
comparison

    (COMPARE (const) (reg))

is not canonical in this case and combine will never correctly
generate it (trying to swap the order of the operands.  To handle this
we write the comparison as

    (COMPARE (NOT (reg)) (~const)),

which has the same result for EQ, NE, LTU, LEU, GTU and GEU, which are
all the cases we are really interested in here.

Finally, we delete the negdi2 pattern.  The generic expanders will use
our new subdi3 expander if this pattern is missing and that can handle
the negate case just fine.

	* config/arm/arm-modes.def (CC_RSB): New CC mode.
	* config/arm/predicates.md (arm_borrow_operation): Handle CC_RSBmode.
	* config/arm/arm.c (arm_select_cc_mode): Detect when we should
	return CC_RSBmode.
	(maybe_get_arm_condition_code): Handle CC_RSBmode.
	* config/arm/arm.md (subsi3_carryin): Make this pattern available to
	expand.
	(subdi3): Rewrite to early-expand the sub-operations.
	(rsb_im_compare): New pattern.
	(negdi2): Delete.
	(negdi2_insn): Delete.
	(arm_negsi2): Correct type attribute to alu_imm.
	(negsi2_0compare): New insn pattern.
	(negsi2_carryin): New insn pattern.

From-SVN: r277169

addsi3_carryin_alt2 has a more strict constraint than the predicate
when adding a constant.  This leads to sub-optimal code in some
circumstances.

	* config/arm/arm.md (addsi3_carryin_alt2): Use arm_not_operand for
	operand 2.

From-SVN: r277168

The add-with-carry operation which involves a shift doesn't match at present
because it isn't matching the canonical form generated by combine.  Fixing
this is simply a matter of re-ordering the operands.

	* config/arm/arm.md (addsi3_carryin_shift_<optab>): Reorder operands
	to match canonical form.

From-SVN: r277167

This patch changes the insn patterns for zero- and sign-extend into
define_expands that generate the appropriate word operations
immediately.

	* config/arm/arm.md (zero_extend<mode>di2): Convert to define_expand.
	(extend<mode>di2): Likewise.

From-SVN: r277166

This patch causes the expansion of adddi3 to split the operation
immediately for Arm and Thumb-2.  This is desirable as it frees up the
register allocator to pick what ever combination of registers suits
best and reduces the number of auxiliary patterns that we need in the
back-end.  Three of the testcases that we disabled earlier are already
fixed by this patch.  Finally, we add a new pattern to match the
canonicalization of add-with-carry when using an immediate of zero.

gcc:
	* config/arm/arm-protos.h (arm_decompose_di_binop): New prototype.
	* config/arm/arm.c (arm_decompose_di_binop): New function.
	* config/arm/arm.md (adddi3): Also accept any const_int for op2.
	If not generating Thumb-1 code, decompose the operation into 32-bit
	pieces.
	* add0si_carryin_<optab>: New pattern.

testsuite:
	* gcc.target/arm/pr53447-1.c: Remove XFAIL.
	* gcc.target/arm/pr53447-3.c: Remove XFAIL.
	* gcc.target/arm/pr53447-4.c: Remove XFAIL.

From-SVN: r277165

The first step towards early splitting of addition and subtraction at
DImode is to rip out the old patterns that are designed to propagate
DImode through the RTL optimization passes and the do late splitting.

This patch does cause some code size regressions, but it should still
execute correctly.  We will progressively add back the optimizations
we had here in later patches.

A small number of tests in the Arm-specific testsuite do fail as a
result of this patch, but that's to be expected, since the
optimizations they are looking for have just been removed.  I've kept
the tests, but XFAILed them for now.

One small technical change is also done in this patch as part of the
cleanup: the uaddv<mode>4 expander is changed to use LTU as the branch
comparison.  This eliminates the need for CC_Cmode to recognize
somewhat bogus equality constraints.

gcc:
	* arm.md (adddi3): Only accept register operands.
	(arm_adddi3): Convert to simple insn with no split.  Do not accept
	constants.
	(adddi_sesidi_di): Delete patern.
	(adddi_zesidi_di): Likewise.
	(uaddv<mode>4): Use LTU as condition for branch.
	(adddi3_compareV): Convert to simple insn with no split.
	(addsi3_compareV_upper): Delete pattern.
	(adddi3_compareC): Convert to simple insn with no split.  Correct
	flags setting expression.
	(addsi3_compareC_upper): Delete pattern.
	(addsi3_compareC): Correct flags setting expression.
	(subdi3_compare1): Convert to simple insn with no split.
	(subsi3_carryin_compare): Delete pattern.
	(arm_subdi3): Convert to simple insn with no split.
	(subdi_zesidi): Delete pattern.
	(subdi_di_sesidi): Delete pattern.
	(subdi_zesidi_di): Delete pattern.
	(subdi_sesidi_di): Delete pattern.
	(subdi_zesidi_zesidi): Delete pattern.
	(negvdi3): Use s_register_operand.
	(negdi2_compare): Convert to simple insn with no split.
	(negdi2_insn): Likewise.
	(negsi2_carryin_compare): Delete pattern.
	(negdi_zero_extendsidi): Delete pattern.
	(arm_cmpdi_insn): Convert to simple insn with no split.
	(negdi2): Don't call gen_negdi2_neon.
	* config/arm/neon.md (adddi3_neon): Delete pattern.
	(subdi3_neon): Delete pattern.
	(negdi2_neon): Delete pattern.
	(splits for negdi2_neon): Delete splits.

testsuite:
	* gcc.target/arm/negdi-3.c: Add XFAILS.
	* gcc.target/arm/pr3447-1.c: Likewise.
	* gcc.target/arm/pr3447-3.c: Likewise.
	* gcc.target/arm/pr3447-4.c: Likewise.

From-SVN: r277164

2019-10-18  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/69455
	* trans-decl.c (generate_local_decl): Avoid misconstructed
	intrinsic modules in a BLOCK construct.

2019-10-18  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/69455
	* gfortran.dg/pr69455_1.f90: New test.
	* gfortran.dg/pr69455_2.f90: Ditto.

From-SVN: r277158

	PR middle-end/92153
	* ggc-page.c (release_pages): Read g->alloc_size before free rather
	than after it.

From-SVN: r277157