Hi! 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.
Bootstrapped/regtested on x86_64-linux and i686-linux, committed to trunk. 2021-05-21 Jakub Jelinek <ja...@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. --- gcc/tree.h.jj 2021-05-19 09:20:57.760095905 +0200 +++ gcc/tree.h 2021-05-21 18:48:20.426823145 +0200 @@ -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) \ --- gcc/gimplify.c.jj 2021-05-21 11:41:02.647089257 +0200 +++ gcc/gimplify.c 2021-05-21 18:51:04.754024788 +0200 @@ -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_const 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, 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 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: --- gcc/c-family/c-omp.c.jj 2021-05-19 09:16:10.968309635 +0200 +++ gcc/c-family/c-omp.c 2021-05-21 19:03:07.993109993 +0200 @@ -1733,10 +1733,21 @@ c_omp_split_clauses (location_t loc, enu { /* 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; --- gcc/c/c-typeck.c.jj 2021-05-10 12:22:30.126455211 +0200 +++ gcc/c/c-typeck.c 2021-05-21 18:50:03.387696357 +0200 @@ -13936,6 +13936,7 @@ c_finish_omp_clauses (tree clauses, enum 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 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 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); --- gcc/cp/semantics.c.jj 2021-05-04 21:02:24.006801700 +0200 +++ gcc/cp/semantics.c 2021-05-21 18:50:41.115283479 +0200 @@ -6519,6 +6519,7 @@ finish_omp_clauses (tree clauses, enum c 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 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 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); --- gcc/testsuite/c-c++-common/gomp/pr99928-3.c.jj 2021-05-13 16:53:31.062368335 +0200 +++ gcc/testsuite/c-c++-common/gomp/pr99928-3.c 2021-05-21 19:03:42.286734700 +0200 @@ -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) --- gcc/testsuite/c-c++-common/gomp/pr99928-15.c.jj 2021-05-21 17:33:38.757849518 +0200 +++ gcc/testsuite/c-c++-common/gomp/pr99928-15.c 2021-05-21 14:50:39.085775344 +0200 @@ -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; +} Jakub