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openmp: Fix up firstprivate+lastprivate clause handling [PR99928]

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The C/C++ clause splitting happens very early during construct parsing,
but only the FEs later on handle possible instantiations, non-static
member handling and array section lowering.
In the OpenMP 5.0/5.1 rules, whether firstprivate is added to combined
target depends on whether it isn't also mentioned in lastprivate or map
clauses, but unfortunately I think such checks are much better done only
when the FEs perform all the above mentioned changes.
So, this patch arranges for the firstprivate clause to be copied or moved
to combined target construct (as before), but sets flags on that clause,
which tell the FE *finish_omp_clauses and the gimplifier it has been added
only conditionally and let the FEs and gimplifier DTRT for these.

2021-05-21  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/99928
gcc/
	* tree.h (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET): Define.
	* gimplify.c (enum gimplify_omp_var_data): Fix up
	GOVD_MAP_HAS_ATTACHMENTS value, add GOVD_FIRSTPRIVATE_IMPLICIT.
	(omp_lastprivate_for_combined_outer_constructs): If combined target
	has GOVD_FIRSTPRIVATE_IMPLICIT set for the decl, change it to
	GOVD_MAP | GOVD_SEEN.
	(gimplify_scan_omp_clauses): Set GOVD_FIRSTPRIVATE_IMPLICIT for
	firstprivate clauses with OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT.
	(gimplify_adjust_omp_clauses): For firstprivate clauses with
	OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT either clear that bit and
	OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET too, or remove it and
	let it be replaced by implicit map clause.
gcc/c-family/
	* c-omp.c (c_omp_split_clauses): Set OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT
	on firstprivate clause copy going to target construct, and for
	target simd set also OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET bit.
gcc/c/
	* c-typeck.c (c_finish_omp_clauses): Move firstprivate clauses with
	OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT to the end of the chain.  Don't error
	if a decl is mentioned both in map clause and in such firstprivate
	clause unless OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET is also set.
gcc/cp/
	* semantics.c (finish_omp_clauses): Move firstprivate clauses with
	OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT to the end of the chain.  Don't error
	if a decl is mentioned both in map clause and in such firstprivate
	clause unless OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET is also set.
gcc/testsuite/
	* c-c++-common/gomp/pr99928-3.c: Remove all xfails.
	* c-c++-common/gomp/pr99928-15.c: New test.
This commit is contained in:
Jakub Jelinek 2021-05-21 21:16:21 +02:00
parent 0c6e792dd5
commit b5c1c7a96b
7 changed files with 140 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gcc/c-family/c-omp.c
View File

@ -1733,10 +1733,21 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
{
/* This must be #pragma omp target simd. */
s = C_OMP_CLAUSE_SPLIT_TARGET;
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (clauses) = 1;
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET (clauses) = 1;
break;
}
c = build_omp_clause (OMP_CLAUSE_LOCATION (clauses),
OMP_CLAUSE_FIRSTPRIVATE);
/* firstprivate should not be applied to target if it is
also lastprivate or on the combined/composite construct,
or if it is mentioned in map clause. OMP_CLAUSE_DECLs
may need to go through FE handling though (instantiation,
C++ non-static data members, array section lowering), so
add the clause with OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT and
let *finish_omp_clauses and the gimplifier handle it
right. */
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c) = 1;
OMP_CLAUSE_DECL (c) = OMP_CLAUSE_DECL (clauses);
OMP_CLAUSE_CHAIN (c) = cclauses[C_OMP_CLAUSE_SPLIT_TARGET];
cclauses[C_OMP_CLAUSE_SPLIT_TARGET] = c;

27
gcc/c/c-typeck.c
View File

@ -13936,6 +13936,7 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
has been seen, -2 if mixed inscan/normal reduction diagnosed. */
int reduction_seen = 0;
bool allocate_seen = false;
bool firstprivate_implicit_moved = false;
bitmap_obstack_initialize (NULL);
bitmap_initialize (&generic_head, &bitmap_default_obstack);
@ -14377,6 +14378,29 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
break;
case OMP_CLAUSE_FIRSTPRIVATE:
if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c)
&& !firstprivate_implicit_moved)
{
firstprivate_implicit_moved = true;
/* Move firstprivate clauses with
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT set to the end of
clauses chain. */
tree cl = NULL, *pc1 = pc, *pc2 = &cl;
while (*pc1)
if (OMP_CLAUSE_CODE (*pc1) == OMP_CLAUSE_FIRSTPRIVATE
&& OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (*pc1))
{
*pc2 = *pc1;
pc2 = &OMP_CLAUSE_CHAIN (*pc2);
*pc1 = OMP_CLAUSE_CHAIN (*pc1);
}
else
pc1 = &OMP_CLAUSE_CHAIN (*pc1);
*pc2 = NULL;
*pc1 = cl;
if (pc1 != pc)
continue;
}
t = OMP_CLAUSE_DECL (c);
need_complete = true;
need_implicitly_determined = true;
@ -14398,6 +14422,9 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
if (ort == C_ORT_ACC)
error_at (OMP_CLAUSE_LOCATION (c),
"%qD appears more than once in data clauses", t);
else if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c)
&& !OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET (c))
/* Silently drop the clause. */;
else
error_at (OMP_CLAUSE_LOCATION (c),
"%qD appears both in data and map clauses", t);

27
gcc/cp/semantics.c
View File

@ -6519,6 +6519,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
bool allocate_seen = false;
tree detach_seen = NULL_TREE;
bool mergeable_seen = false;
bool firstprivate_implicit_moved = false;
bitmap_obstack_initialize (NULL);
bitmap_initialize (&generic_head, &bitmap_default_obstack);
@ -6843,6 +6844,29 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
break;
case OMP_CLAUSE_FIRSTPRIVATE:
if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c)
&& !firstprivate_implicit_moved)
{
firstprivate_implicit_moved = true;
/* Move firstprivate clauses with
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT set to the end of
clauses chain. */
tree cl = NULL, *pc1 = pc, *pc2 = &cl;
while (*pc1)
if (OMP_CLAUSE_CODE (*pc1) == OMP_CLAUSE_FIRSTPRIVATE
&& OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (*pc1))
{
*pc2 = *pc1;
pc2 = &OMP_CLAUSE_CHAIN (*pc2);
*pc1 = OMP_CLAUSE_CHAIN (*pc1);
}
else
pc1 = &OMP_CLAUSE_CHAIN (*pc1);
*pc2 = NULL;
*pc1 = cl;
if (pc1 != pc)
continue;
}
t = omp_clause_decl_field (OMP_CLAUSE_DECL (c));
if (t)
omp_note_field_privatization (t, OMP_CLAUSE_DECL (c));
@ -6884,6 +6908,9 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
if (ort == C_ORT_ACC)
error_at (OMP_CLAUSE_LOCATION (c),
"%qD appears more than once in data clauses", t);
else if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c)
&& !OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET (c))
/* Silently drop the clause. */;
else
error_at (OMP_CLAUSE_LOCATION (c),
"%qD appears both in data and map clauses", t);

45
gcc/gimplify.c
View File

@ -126,7 +126,10 @@ enum gimplify_omp_var_data
/* Flag for GOVD_MAP: (struct) vars that have pointer attachments for
fields. */
GOVD_MAP_HAS_ATTACHMENTS = 8388608,
GOVD_MAP_HAS_ATTACHMENTS = 0x4000000,
/* Flag for GOVD_FIRSTPRIVATE: OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT. */
GOVD_FIRSTPRIVATE_IMPLICIT = 0x8000000,
GOVD_DATA_SHARE_CLASS = (GOVD_SHARED | GOVD_PRIVATE | GOVD_FIRSTPRIVATE
| GOVD_LASTPRIVATE | GOVD_REDUCTION | GOVD_LINEAR
@ -8586,13 +8589,24 @@ omp_lastprivate_for_combined_outer_constructs (struct gimplify_omp_ctx *octx,
omp_add_variable (octx, decl, GOVD_LASTPRIVATE | GOVD_SEEN);
continue;
}
if (octx->region_type == ORT_COMBINED_TARGET
&& splay_tree_lookup (octx->variables,
(splay_tree_key) decl) == NULL)
if (octx->region_type == ORT_COMBINED_TARGET)
{
omp_add_variable (octx, decl, GOVD_MAP | GOVD_SEEN);
octx = octx->outer_context;
break;
splay_tree_node n = splay_tree_lookup (octx->variables,
(splay_tree_key) decl);
if (n == NULL)
{
omp_add_variable (octx, decl, GOVD_MAP | GOVD_SEEN);
octx = octx->outer_context;
}
else if (!implicit_p
&& (n->value & GOVD_FIRSTPRIVATE_IMPLICIT))
{
n->value &= ~(GOVD_FIRSTPRIVATE
| GOVD_FIRSTPRIVATE_IMPLICIT
| GOVD_EXPLICIT);
omp_add_variable (octx, decl, GOVD_MAP | GOVD_SEEN);
octx = octx->outer_context;
}
}
break;
}
@ -8673,6 +8687,11 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
case OMP_CLAUSE_FIRSTPRIVATE:
flags = GOVD_FIRSTPRIVATE | GOVD_EXPLICIT;
check_non_private = "firstprivate";
if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c))
{
gcc_assert (code == OMP_TARGET);
flags |= GOVD_FIRSTPRIVATE_IMPLICIT;
}
goto do_add;
case OMP_CLAUSE_LASTPRIVATE:
if (OMP_CLAUSE_LASTPRIVATE_CONDITIONAL (c))
@ -10532,6 +10551,18 @@ gimplify_adjust_omp_clauses (gimple_seq *pre_p, gimple_seq body, tree *list_p,
remove = true;
break;
}
if (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c))
{
decl = OMP_CLAUSE_DECL (c);
n = splay_tree_lookup (ctx->variables, (splay_tree_key) decl);
if ((n->value & GOVD_MAP) != 0)
{
remove = true;
break;
}
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET (c) = 0;
OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT (c) = 0;
}
/* FALLTHRU */
case OMP_CLAUSE_PRIVATE:
case OMP_CLAUSE_SHARED:

26
gcc/testsuite/c-c++-common/gomp/pr99928-15.c Normal file
View File

@ -0,0 +1,26 @@
/* PR middle-end/99928 */
int v;
void
foo (void)
{
#pragma omp target parallel firstprivate (v) map(tofrom: v) /* { dg-bogus "'v' appears both in data and map clauses" } */
v++;
}
void
bar (void)
{
#pragma omp target firstprivate (v) map (tofrom: v) /* { dg-error "'v' appears both in data and map clauses" } */
v++;
}
void
baz (void)
{
int j;
#pragma omp target simd firstprivate (v) map (tofrom: v) private (j) /* { dg-error "'v' appears both in data and map clauses" } */
for (int i = 0; i < 1; i++)
j = v;
}

12
gcc/testsuite/c-c++-common/gomp/pr99928-3.c
View File

@ -82,8 +82,8 @@ bar (void)
#pragma omp section
l07 = 2;
}
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l08" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l08\\)" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l08" "gimple" } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l08\\)" "gimple" } } */
/* { dg-final { scan-tree-dump "omp parallel\[^\n\r]*firstprivate\\(l08\\)" "gimple" } } *//* FIXME: This should be on for instead. */
/* { dg-final { scan-tree-dump "omp parallel\[^\n\r]*lastprivate\\(l08\\)" "gimple" } } *//* FIXME: This should be on for instead. */
/* { dg-final { scan-tree-dump-not "omp for\[^\n\r]*firstprivate\\(l08\\)" "gimple" } } *//* FIXME. */
@ -91,8 +91,8 @@ bar (void)
#pragma omp target parallel for firstprivate (l08) lastprivate (l08)
for (int i = 0; i < 64; i++)
l08 = i;
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l09" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l09\\)" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l09" "gimple" } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l09\\)" "gimple" } } */
/* { dg-final { scan-tree-dump "omp parallel\[^\n\r]*firstprivate\\(l09\\)" "gimple" } } *//* FIXME: This should be on for instead. */
/* { dg-final { scan-tree-dump "omp parallel\[^\n\r]*lastprivate\\(l09\\)" "gimple" } } *//* FIXME: This should be on for instead. */
/* { dg-final { scan-tree-dump-not "omp for\[^\n\r]*firstprivate\\(l09\\)" "gimple" } } *//* FIXME. */
@ -102,8 +102,8 @@ bar (void)
#pragma omp target parallel for simd firstprivate (l09) lastprivate (l09)
for (int i = 0; i < 64; i++)
l09 = i;
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l10" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l10\\)" "gimple" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump "omp target\[^\n\r]*map\\(tofrom:l10" "gimple" } } */
/* { dg-final { scan-tree-dump-not "omp target\[^\n\r]*firstprivate\\(l10\\)" "gimple" } } */
/* { dg-final { scan-tree-dump-not "omp simd\[^\n\r]*firstprivate\\(l10\\)" "gimple" } } */
/* { dg-final { scan-tree-dump "omp simd\[^\n\r]*lastprivate\\(l10\\)" "gimple" } } */
#pragma omp target simd firstprivate (l10) lastprivate (l10)

5
gcc/tree.h
View File

@ -1538,6 +1538,11 @@ class auto_suppress_location_wrappers
#define OMP_CLAUSE_FIRSTPRIVATE_NO_REFERENCE(NODE) \
TREE_PRIVATE (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_FIRSTPRIVATE))
/* True on a FIRSTPRIVATE clause with OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT also
set if target construct is the only one that accepts the clause. */
#define OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT_TARGET(NODE) \
TREE_PROTECTED (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_FIRSTPRIVATE))
/* True on a LASTPRIVATE clause if a FIRSTPRIVATE clause for the same
decl is present in the chain. */
#define OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE(NODE) \