[openacc] Add oacc_get_min_dim

Expose oacc_min_dims to backends.

2019-01-07  Tom de Vries  <tdevries@suse.de>

	* omp-offload.c (oacc_get_min_dim): New function.
	* omp-offload.h (oacc_get_min_dim): Declare.

From-SVN: r267623

gcc/ChangeLog

+2019-01-07  Tom de Vries  <tdevries@suse.de>
+
+	* omp-offload.c (oacc_get_min_dim): New function.
+	* omp-offload.h (oacc_get_min_dim): Declare.
+
 2018-12-26  Mateusz B  <mateuszb@poczta.onet.pl>
 
 	PR target/88521

gcc/omp-offload.c

@@ -580,6 +580,13 @@ oacc_get_default_dim (int dim)
   return oacc_default_dims[dim];
 }
 
+int
+oacc_get_min_dim (int dim)
+{
+  gcc_assert (0 <= dim && dim < GOMP_DIM_MAX);
+  return oacc_min_dims[dim];
+}
+
 /* Parse the default dimension parameter.  This is a set of
    :-separated optional compute dimensions.  Each specified dimension
    is a positive integer.  When device type support is added, it is

gcc/omp-offload.h

@@ -23,6 +23,7 @@ along with GCC; see the file COPYING3.  If not see
 #define GCC_OMP_DEVICE_H
 
 extern int oacc_get_default_dim (int dim);
+extern int oacc_get_min_dim (int dim);
 extern int oacc_fn_attrib_level (tree attr);
 
 extern GTY(()) vec<tree, va_gc> *offload_funcs;