@@ -3811,6 +3811,14 @@ lower_rec_input_clauses (tree clauses, g
|| is_variable_sized (OMP_CLAUSE_DECL (c)))
sctx.max_vf = 1;
break;
+ case OMP_CLAUSE_IF:
+ if (integer_zerop (OMP_CLAUSE_IF_EXPR (c)))
+ sctx.max_vf = 1;
+ break;
+ case OMP_CLAUSE_SIMDLEN:
+ if (integer_onep (OMP_CLAUSE_SIMDLEN_EXPR (c)))
+ sctx.max_vf = 1;
+ break;
default:
continue;
}
@@ -4664,10 +4664,15 @@ expand_omp_simd (struct omp_region *regi
tree *counts = NULL;
int i;
int safelen_int = INT_MAX;
+ bool dont_vectorize = false;
tree safelen = omp_find_clause (gimple_omp_for_clauses (fd->for_stmt),
OMP_CLAUSE_SAFELEN);
tree simduid = omp_find_clause (gimple_omp_for_clauses (fd->for_stmt),
OMP_CLAUSE__SIMDUID_);
+ tree ifc = omp_find_clause (gimple_omp_for_clauses (fd->for_stmt),
+ OMP_CLAUSE_IF);
+ tree simdlen = omp_find_clause (gimple_omp_for_clauses (fd->for_stmt),
+ OMP_CLAUSE_SIMDLEN);
tree n1, n2;
if (safelen)
@@ -4681,6 +4686,12 @@ expand_omp_simd (struct omp_region *regi
if (safelen_int == 1)
safelen_int = 0;
}
+ if ((ifc && integer_zerop (OMP_CLAUSE_IF_EXPR (ifc)))
+ || (simdlen && integer_onep (OMP_CLAUSE_SIMDLEN_EXPR (simdlen))))
+ {
+ safelen_int = 0;
+ dont_vectorize = true;
+ }
type = TREE_TYPE (fd->loop.v);
entry_bb = region->entry;
cont_bb = region->cont;
@@ -4965,6 +4976,8 @@ expand_omp_simd (struct omp_region *regi
loop->force_vectorize = true;
cfun->has_force_vectorize_loops = true;
}
+ else if (dont_vectorize)
+ loop->dont_vectorize = true;
}
else if (simduid)
cfun->has_simduid_loops = true;
@@ -0,0 +1,37 @@
+/* { dg-do compile } */
+/* { dg-options "-fopenmp -O3 -fdump-tree-vect-details" } */
+/* { dg-final { scan-tree-dump-times "vectorized 0 loops in function" 4 "vect" } } */
+
+int a[1024];
+
+void
+foo (void)
+{
+ #pragma omp simd if (0)
+ for (int i = 0; i < 1024; ++i)
+ a[i] = a[i] + 1;
+}
+
+void
+bar (void)
+{
+ #pragma omp simd if (0) safelen (256) simdlen (8)
+ for (int i = 0; i < 512; ++i)
+ a[i] = a[i] + 1;
+}
+
+void
+baz (void)
+{
+ #pragma omp simd safelen (256) simdlen (1)
+ for (int i = 0; i < 512; ++i)
+ a[i] = a[i] + 1;
+}
+
+void
+qux (void)
+{
+ #pragma omp simd simdlen (1) if (1)
+ for (int i = 0; i < 512; ++i)
+ a[i] = a[i] + 1;
+}