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Re: [PR 79108] Put ipa_node_params to GC memory
- From: Richard Biener <richard dot guenther at gmail dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>, Jan Hubicka <jh at suse dot cz>
- Date: Mon, 23 Jan 2017 10:52:22 +0100
- Subject: Re: [PR 79108] Put ipa_node_params to GC memory
- Authentication-results: sourceware.org; auth=none
- References: <20170120215807.yh7acd36yq4qd4ur@virgil.suse.cz>
On Fri, Jan 20, 2017 at 10:58 PM, Martin Jambor <mjambor@suse.cz> wrote:
> Hi,
>
> when I fixed PR 78365 by streaming types of parameters that might not
> have been anywhere else, I forgot that I was holding them in non-GC
> memory and so I caused PR 79108. The following patch fixes it by
> putting ipa_param_descriptor and ipa_node_params structures into GC
> memory, together with summary holding class ipa_node_params_t which is
> now a GC root. In the process, I have turned the destructor of the
> latter into a remove and insert hooks of the summary holder.
>
> Bootstrapped and tested on x86_64-linux, also LTO-bootstrapped and
> tested, although with only C,C++ and Fortran and with sanitizers and
> multilib disabled. (It is now a part of an undergoing LTO bootstrap
> with everything). OK for trunk?
Ok.
Richard.
> Thanks,
>
> Martin
>
>
> 2017-01-19 Martin Jambor <mjambor@suse.cz>
>
> PR ipa/79108
> * ipa-prop.h (ipa_param_descriptor): Anotate with with GTY(()).
> (ipa_node_params): Annotate with GTY((for_user)). Make descriptors
> field a pointer to garbage collected vector, mark lattices and
> ipcp_orig_node with GTY((skip)).
> (ipa_get_param_count): Adjust to descriptors being a pointer.
> (ipa_get_param): Likewise.
> (ipa_get_type): Likewise.
> (ipa_get_param_move_cost): Likewise.
> (ipa_set_param_used): Likewise.
> (ipa_get_controlled_uses): Likewise.
> (ipa_set_controlled_uses): Likewise.
> (ipa_is_param_used): Likewise.
> (ipa_node_params_t): Move into garbage collector. New methods insert
> and remove.
> (ipa_node_params_sum): Annotate wth GTY(()).
> (ipa_check_create_node_params): Adjust to ipa_node_params_sum being
> garbage collected.
> (ipa_load_from_parm_agg): Adjust declaration.
> * ipa-icf.c (param_used_p): Adjust to descriptors being a pointer.
> * ipa-profile.c (ipa_profile): Likewise.
> * ipa-prop.c (ipa_get_param_decl_index_1): Likewise.
> (ipa_populate_param_decls): Make descriptors parameter garbage
> collected.
> (ipa_dump_param): Adjust to descriptors being a pointer.
> (ipa_alloc_node_params): Likewise.
> (ipa_initialize_node_params): Likewise.
> (load_from_param_1): Make descriptors parameter garbage collected.
> (load_from_unmodified_param): Likewise.
> (load_from_param): Likewise.
> (ipa_load_from_parm_agg): Likewise.
> (ipa_node_params::~ipa_node_params): Removed.
> (ipa_free_all_node_params): Remove call to delete operator.
> (ipa_node_params_t::insert): New.
> (ipa_node_params_t::remove): Likewise.
> (ipa_node_params_t::duplicate): Adjust to descriptors being a pointer,
> copy known_csts and known_contexts vectors.
> (ipa_read_node_info): Adjust to descriptors being a pointer.
> (ipcp_modif_dom_walker): Make m_descriptors field garbage
> collected.
> (ipcp_transform_function): Make descriptors variable garbage
> collected.
>
> testsuite/
> * gfortran.dg/lto/pr79108_0.f90: New test.
> ---
> gcc/ipa-icf.c | 5 +-
> gcc/ipa-profile.c | 3 +-
> gcc/ipa-prop.c | 101 +++++++++++++++-------------
> gcc/ipa-prop.h | 62 ++++++++++-------
> gcc/testsuite/gfortran.dg/lto/pr79108_0.f90 | 14 ++++
> 5 files changed, 111 insertions(+), 74 deletions(-)
> create mode 100644 gcc/testsuite/gfortran.dg/lto/pr79108_0.f90
>
> diff --git a/gcc/ipa-icf.c b/gcc/ipa-icf.c
> index c17a677b459..b9a5b4f2546 100644
> --- a/gcc/ipa-icf.c
> +++ b/gcc/ipa-icf.c
> @@ -539,9 +539,8 @@ sem_function::param_used_p (unsigned int i)
>
> struct ipa_node_params *parms_info = IPA_NODE_REF (get_node ());
>
> - if (parms_info->descriptors.is_empty ()
> - || parms_info->descriptors.length () <= i)
> - return true;
> + if (vec_safe_length (parms_info->descriptors) <= i)
> + return true;
>
> return ipa_is_param_used (IPA_NODE_REF (get_node ()), i);
> }
> diff --git a/gcc/ipa-profile.c b/gcc/ipa-profile.c
> index 3e9b2a915fc..ae1ca2f3762 100644
> --- a/gcc/ipa-profile.c
> +++ b/gcc/ipa-profile.c
> @@ -621,7 +621,8 @@ ipa_profile (void)
> "and can be discarded.\n");
> }
> else if (ipa_node_params_sum && ipa_edge_args_vector
> - && !IPA_NODE_REF (n2)->descriptors.is_empty ()
> + && (!vec_safe_is_empty
> + (IPA_NODE_REF (n2)->descriptors))
> && ipa_get_param_count (IPA_NODE_REF (n2))
> != ipa_get_cs_argument_count (IPA_EDGE_REF (e))
> && (ipa_get_param_count (IPA_NODE_REF (n2))
> diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
> index 1f68f736e46..4d77c9b25ef 100644
> --- a/gcc/ipa-prop.c
> +++ b/gcc/ipa-prop.c
> @@ -99,13 +99,14 @@ ipa_func_spec_opts_forbid_analysis_p (struct cgraph_node *node)
> to INFO. */
>
> static int
> -ipa_get_param_decl_index_1 (vec<ipa_param_descriptor> descriptors, tree ptree)
> +ipa_get_param_decl_index_1 (vec<ipa_param_descriptor, va_gc> *descriptors,
> + tree ptree)
> {
> int i, count;
>
> - count = descriptors.length ();
> + count = vec_safe_length (descriptors);
> for (i = 0; i < count; i++)
> - if (descriptors[i].decl_or_type == ptree)
> + if ((*descriptors)[i].decl_or_type == ptree)
> return i;
>
> return -1;
> @@ -125,7 +126,7 @@ ipa_get_param_decl_index (struct ipa_node_params *info, tree ptree)
>
> static void
> ipa_populate_param_decls (struct cgraph_node *node,
> - vec<ipa_param_descriptor> &descriptors)
> + vec<ipa_param_descriptor, va_gc> &descriptors)
> {
> tree fndecl;
> tree fnargs;
> @@ -168,10 +169,10 @@ void
> ipa_dump_param (FILE *file, struct ipa_node_params *info, int i)
> {
> fprintf (file, "param #%i", i);
> - if (info->descriptors[i].decl_or_type)
> + if ((*info->descriptors)[i].decl_or_type)
> {
> fprintf (file, " ");
> - print_generic_expr (file, info->descriptors[i].decl_or_type, 0);
> + print_generic_expr (file, (*info->descriptors)[i].decl_or_type, 0);
> }
> }
>
> @@ -183,8 +184,8 @@ ipa_alloc_node_params (struct cgraph_node *node, int param_count)
> {
> struct ipa_node_params *info = IPA_NODE_REF (node);
>
> - if (!info->descriptors.exists () && param_count)
> - info->descriptors.safe_grow_cleared (param_count);
> + if (!info->descriptors && param_count)
> + vec_safe_grow_cleared (info->descriptors, param_count);
> }
>
> /* Initialize the ipa_node_params structure associated with NODE by counting
> @@ -196,10 +197,10 @@ ipa_initialize_node_params (struct cgraph_node *node)
> {
> struct ipa_node_params *info = IPA_NODE_REF (node);
>
> - if (!info->descriptors.exists ())
> + if (!info->descriptors)
> {
> ipa_alloc_node_params (node, count_formal_params (node->decl));
> - ipa_populate_param_decls (node, info->descriptors);
> + ipa_populate_param_decls (node, *info->descriptors);
> }
> }
>
> @@ -867,7 +868,7 @@ parm_preserved_before_stmt_p (struct ipa_func_body_info *fbi, int index,
>
> static int
> load_from_param_1 (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descriptors,
> + vec<ipa_param_descriptor, va_gc> *descriptors,
> gimple *stmt)
> {
> int index;
> @@ -892,7 +893,7 @@ load_from_param_1 (struct ipa_func_body_info *fbi,
>
> static int
> load_from_unmodified_param (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descriptors,
> + vec<ipa_param_descriptor, va_gc> *descriptors,
> gimple *stmt)
> {
> if (!gimple_assign_single_p (stmt))
> @@ -906,7 +907,7 @@ load_from_unmodified_param (struct ipa_func_body_info *fbi,
>
> static int
> load_from_param (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descriptors,
> + vec<ipa_param_descriptor, va_gc> *descriptors,
> gimple *stmt)
> {
> if (!is_gimple_assign (stmt))
> @@ -1010,7 +1011,7 @@ parm_ref_data_pass_through_p (struct ipa_func_body_info *fbi, int index,
>
> bool
> ipa_load_from_parm_agg (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descriptors,
> + vec<ipa_param_descriptor, va_gc> *descriptors,
> gimple *stmt, tree op, int *index_p,
> HOST_WIDE_INT *offset_p, HOST_WIDE_INT *size_p,
> bool *by_ref_p, bool *guaranteed_unmodified)
> @@ -3604,33 +3605,11 @@ ipa_free_all_edge_args (void)
> vec_free (ipa_edge_args_vector);
> }
>
> -/* Frees all dynamically allocated structures that the param info points
> - to. */
> -
> -ipa_node_params::~ipa_node_params ()
> -{
> - descriptors.release ();
> - free (lattices);
> - /* Lattice values and their sources are deallocated with their alocation
> - pool. */
> - known_csts.release ();
> - known_contexts.release ();
> -
> - lattices = NULL;
> - ipcp_orig_node = NULL;
> - analysis_done = 0;
> - node_enqueued = 0;
> - do_clone_for_all_contexts = 0;
> - is_all_contexts_clone = 0;
> - node_dead = 0;
> -}
> -
> /* Free all ipa_node_params structures. */
>
> void
> ipa_free_all_node_params (void)
> {
> - delete ipa_node_params_sum;
> ipa_node_params_sum = NULL;
> }
>
> @@ -3792,6 +3771,36 @@ ipa_add_new_function (cgraph_node *node, void *data ATTRIBUTE_UNUSED)
> ipa_analyze_node (node);
> }
>
> +/* Initialize a newly created param info. */
> +
> +void
> +ipa_node_params_t::insert (cgraph_node *, ipa_node_params *info)
> +{
> + info->lattices = NULL;
> + info->ipcp_orig_node = NULL;
> + info->analysis_done = 0;
> + info->node_enqueued = 0;
> + info->do_clone_for_all_contexts = 0;
> + info->is_all_contexts_clone = 0;
> + info->node_dead = 0;
> + info->node_within_scc = 0;
> + info->node_calling_single_call = 0;
> + info->versionable = 0;
> +}
> +
> +/* Frees all dynamically allocated structures that the param info points
> + to. */
> +
> +void
> +ipa_node_params_t::remove (cgraph_node *, ipa_node_params *info)
> +{
> + free (info->lattices);
> + /* Lattice values and their sources are deallocated with their alocation
> + pool. */
> + info->known_csts.release ();
> + info->known_contexts.release ();
> +}
> +
> /* Hook that is called by summary when a node is duplicated. */
>
> void
> @@ -3801,9 +3810,11 @@ ipa_node_params_t::duplicate(cgraph_node *src, cgraph_node *dst,
> {
> ipa_agg_replacement_value *old_av, *new_av;
>
> - new_info->descriptors = old_info->descriptors.copy ();
> + new_info->descriptors = vec_safe_copy (old_info->descriptors);
> new_info->lattices = NULL;
> new_info->ipcp_orig_node = old_info->ipcp_orig_node;
> + new_info->known_csts = old_info->known_csts.copy ();
> + new_info->known_contexts = old_info->known_contexts.copy ();
>
> new_info->analysis_done = old_info->analysis_done;
> new_info->node_enqueued = old_info->node_enqueued;
> @@ -5022,7 +5033,7 @@ ipa_read_node_info (struct lto_input_block *ib, struct cgraph_node *node,
> ipa_alloc_node_params (node, streamer_read_uhwi (ib));
>
> for (k = 0; k < ipa_get_param_count (info); k++)
> - info->descriptors[k].move_cost = streamer_read_uhwi (ib);
> + (*info->descriptors)[k].move_cost = streamer_read_uhwi (ib);
>
> bp = streamer_read_bitpack (ib);
> if (ipa_get_param_count (info) != 0)
> @@ -5033,7 +5044,7 @@ ipa_read_node_info (struct lto_input_block *ib, struct cgraph_node *node,
> for (k = 0; k < ipa_get_param_count (info); k++)
> {
> ipa_set_controlled_uses (info, k, streamer_read_hwi (ib));
> - info->descriptors[k].decl_or_type = stream_read_tree (ib, data_in);
> + (*info->descriptors)[k].decl_or_type = stream_read_tree (ib, data_in);
> }
> for (e = node->callees; e; e = e->next_callee)
> {
> @@ -5483,7 +5494,7 @@ class ipcp_modif_dom_walker : public dom_walker
> {
> public:
> ipcp_modif_dom_walker (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descs,
> + vec<ipa_param_descriptor, va_gc> *descs,
> struct ipa_agg_replacement_value *av,
> bool *sc, bool *cc)
> : dom_walker (CDI_DOMINATORS), m_fbi (fbi), m_descriptors (descs),
> @@ -5493,7 +5504,7 @@ public:
>
> private:
> struct ipa_func_body_info *m_fbi;
> - vec<ipa_param_descriptor> m_descriptors;
> + vec<ipa_param_descriptor, va_gc> *m_descriptors;
> struct ipa_agg_replacement_value *m_aggval;
> bool *m_something_changed, *m_cfg_changed;
> };
> @@ -5751,7 +5762,7 @@ ipcp_update_vr (struct cgraph_node *node)
> unsigned int
> ipcp_transform_function (struct cgraph_node *node)
> {
> - vec<ipa_param_descriptor> descriptors = vNULL;
> + vec<ipa_param_descriptor, va_gc> *descriptors = NULL;
> struct ipa_func_body_info fbi;
> struct ipa_agg_replacement_value *aggval;
> int param_count;
> @@ -5783,8 +5794,8 @@ ipcp_transform_function (struct cgraph_node *node)
> fbi.param_count = param_count;
> fbi.aa_walked = 0;
>
> - descriptors.safe_grow_cleared (param_count);
> - ipa_populate_param_decls (node, descriptors);
> + vec_safe_grow_cleared (descriptors, param_count);
> + ipa_populate_param_decls (node, *descriptors);
> calculate_dominance_info (CDI_DOMINATORS);
> ipcp_modif_dom_walker (&fbi, descriptors, aggval, &something_changed,
> &cfg_changed).walk (ENTRY_BLOCK_PTR_FOR_FN (cfun));
> @@ -5799,7 +5810,7 @@ ipcp_transform_function (struct cgraph_node *node)
> (*ipcp_transformations)[node->uid].bits = NULL;
> (*ipcp_transformations)[node->uid].m_vr = NULL;
>
> - descriptors.release ();
> + vec_free (descriptors);
>
> if (!something_changed)
> return 0;
> diff --git a/gcc/ipa-prop.h b/gcc/ipa-prop.h
> index c9a69ab1f53..93a2390c321 100644
> --- a/gcc/ipa-prop.h
> +++ b/gcc/ipa-prop.h
> @@ -298,7 +298,7 @@ ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
>
> /* Summary describing a single formal parameter. */
>
> -struct ipa_param_descriptor
> +struct GTY(()) ipa_param_descriptor
> {
> /* In analysis and modification phase, this is the PARAM_DECL of this
> parameter, in IPA LTO phase, this is the type of the the described
> @@ -318,25 +318,23 @@ struct ipa_param_descriptor
> and some other information for interprocedural passes that operate on
> parameters (such as ipa-cp). */
>
> -struct ipa_node_params
> +struct GTY((for_user)) ipa_node_params
> {
> - ~ipa_node_params ();
> -
> /* Information about individual formal parameters that are gathered when
> summaries are generated. */
> - vec<ipa_param_descriptor> descriptors;
> + vec<ipa_param_descriptor, va_gc> *descriptors;
> /* Pointer to an array of structures describing individual formal
> parameters. */
> - struct ipcp_param_lattices *lattices;
> + struct ipcp_param_lattices * GTY((skip)) lattices;
> /* Only for versioned nodes this field would not be NULL,
> it points to the node that IPA cp cloned from. */
> - struct cgraph_node *ipcp_orig_node;
> + struct cgraph_node * GTY((skip)) ipcp_orig_node;
> /* If this node is an ipa-cp clone, these are the known constants that
> describe what it has been specialized for. */
> - vec<tree> known_csts;
> + vec<tree> GTY((skip)) known_csts;
> /* If this node is an ipa-cp clone, these are the known polymorphic contexts
> that describe what it has been specialized for. */
> - vec<ipa_polymorphic_call_context> known_contexts;
> + vec<ipa_polymorphic_call_context> GTY((skip)) known_contexts;
> /* Whether the param uses analysis and jump function computation has already
> been performed. */
> unsigned analysis_done : 1;
> @@ -417,7 +415,7 @@ struct ipa_func_body_info
> static inline int
> ipa_get_param_count (struct ipa_node_params *info)
> {
> - return info->descriptors.length ();
> + return vec_safe_length (info->descriptors);
> }
>
> /* Return the declaration of Ith formal parameter of the function corresponding
> @@ -428,8 +426,9 @@ ipa_get_param_count (struct ipa_node_params *info)
> static inline tree
> ipa_get_param (struct ipa_node_params *info, int i)
> {
> + gcc_checking_assert (info->descriptors);
> gcc_checking_assert (!flag_wpa);
> - tree t = info->descriptors[i].decl_or_type;
> + tree t = (*info->descriptors)[i].decl_or_type;
> gcc_checking_assert (TREE_CODE (t) == PARM_DECL);
> return t;
> }
> @@ -440,7 +439,8 @@ ipa_get_param (struct ipa_node_params *info, int i)
> static inline tree
> ipa_get_type (struct ipa_node_params *info, int i)
> {
> - tree t = info->descriptors[i].decl_or_type;
> + gcc_checking_assert (info->descriptors);
> + tree t = (*info->descriptors)[i].decl_or_type;
> if (!t)
> return NULL;
> if (TYPE_P (t))
> @@ -455,7 +455,8 @@ ipa_get_type (struct ipa_node_params *info, int i)
> static inline int
> ipa_get_param_move_cost (struct ipa_node_params *info, int i)
> {
> - return info->descriptors[i].move_cost;
> + gcc_checking_assert (info->descriptors);
> + return (*info->descriptors)[i].move_cost;
> }
>
> /* Set the used flag corresponding to the Ith formal parameter of the function
> @@ -464,7 +465,8 @@ ipa_get_param_move_cost (struct ipa_node_params *info, int i)
> static inline void
> ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
> {
> - info->descriptors[i].used = val;
> + gcc_checking_assert (info->descriptors);
> + (*info->descriptors)[i].used = val;
> }
>
> /* Return how many uses described by ipa-prop a parameter has or
> @@ -473,9 +475,9 @@ ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
> static inline int
> ipa_get_controlled_uses (struct ipa_node_params *info, int i)
> {
> - /* FIXME: introducing speuclation causes out of bounds access here. */
> - if (info->descriptors.length () > (unsigned)i)
> - return info->descriptors[i].controlled_uses;
> + /* FIXME: introducing speculation causes out of bounds access here. */
> + if (vec_safe_length (info->descriptors) > (unsigned)i)
> + return (*info->descriptors)[i].controlled_uses;
> return IPA_UNDESCRIBED_USE;
> }
>
> @@ -484,7 +486,8 @@ ipa_get_controlled_uses (struct ipa_node_params *info, int i)
> static inline void
> ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
> {
> - info->descriptors[i].controlled_uses = val;
> + gcc_checking_assert (info->descriptors);
> + (*info->descriptors)[i].controlled_uses = val;
> }
>
> /* Return the used flag corresponding to the Ith formal parameter of the
> @@ -493,7 +496,8 @@ ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
> static inline bool
> ipa_is_param_used (struct ipa_node_params *info, int i)
> {
> - return info->descriptors[i].used;
> + gcc_checking_assert (info->descriptors);
> + return (*info->descriptors)[i].used;
> }
>
> /* Information about replacements done in aggregates for a given node (each
> @@ -569,12 +573,16 @@ ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
> }
>
> /* Function summary for ipa_node_params. */
> -class ipa_node_params_t: public function_summary <ipa_node_params *>
> +class GTY((user)) ipa_node_params_t: public function_summary <ipa_node_params *>
> {
> public:
> - ipa_node_params_t (symbol_table *table):
> - function_summary<ipa_node_params *> (table) { }
> + ipa_node_params_t (symbol_table *table, bool ggc):
> + function_summary<ipa_node_params *> (table, ggc) { }
>
> + /* Hook that is called by summary when a node is deleted. */
> + virtual void insert (cgraph_node *, ipa_node_params *info);
> + /* Hook that is called by summary when a node is deleted. */
> + virtual void remove (cgraph_node *, ipa_node_params *info);
> /* Hook that is called by summary when a node is duplicated. */
> virtual void duplicate (cgraph_node *node,
> cgraph_node *node2,
> @@ -583,12 +591,14 @@ public:
> };
>
> /* Function summary where the parameter infos are actually stored. */
> -extern ipa_node_params_t *ipa_node_params_sum;
> +extern GTY(()) ipa_node_params_t * ipa_node_params_sum;
> +
> /* Vector of IPA-CP transformation data for each clone. */
> extern GTY(()) vec<ipcp_transformation_summary, va_gc> *ipcp_transformations;
> /* Vector where the parameter infos are actually stored. */
> extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
>
> +
> /* Return the associated parameter/argument info corresponding to the given
> node/edge. */
> #define IPA_NODE_REF(NODE) (ipa_node_params_sum->get (NODE))
> @@ -616,7 +626,9 @@ static inline void
> ipa_check_create_node_params (void)
> {
> if (!ipa_node_params_sum)
> - ipa_node_params_sum = new ipa_node_params_t (symtab);
> + ipa_node_params_sum
> + = (new (ggc_cleared_alloc <ipa_node_params_t> ())
> + ipa_node_params_t (symtab, true));
> }
>
> /* This function ensures the array of edge arguments infos is big enough to
> @@ -680,7 +692,7 @@ tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *agg, tree scalar,
> HOST_WIDE_INT offset, bool by_ref,
> bool *from_global_constant = NULL);
> bool ipa_load_from_parm_agg (struct ipa_func_body_info *fbi,
> - vec<ipa_param_descriptor> descriptors,
> + vec<ipa_param_descriptor, va_gc> *descriptors,
> gimple *stmt, tree op, int *index_p,
> HOST_WIDE_INT *offset_p, HOST_WIDE_INT *size_p,
> bool *by_ref, bool *guaranteed_unmodified = NULL);
> diff --git a/gcc/testsuite/gfortran.dg/lto/pr79108_0.f90 b/gcc/testsuite/gfortran.dg/lto/pr79108_0.f90
> new file mode 100644
> index 00000000000..58412afc3c8
> --- /dev/null
> +++ b/gcc/testsuite/gfortran.dg/lto/pr79108_0.f90
> @@ -0,0 +1,14 @@
> +! { dg-lto-do link }
> +! { dg-lto-options {{ -Ofast -flto --param ggc-min-expand=0 --param ggc-min-heapsize=0 }} }
> +! { dg-extra-ld-options "-r -nostdlib" }
> +
> +MODULE Errorcheck_mod
> +CONTAINS
> +SUBROUTINE Check_open(ios, outputstr, errortype)
> +character(len=*), intent(in) :: outputstr
> +if (ios > 0 .AND. errortype == FATAL) then
> + write(*,*) 'The value of ios was:', ios
> +end if
> +END SUBROUTINE Check_open
> +END MODULE Errorcheck_mod
> +
> --
> 2.11.0
>