Fortran: Extend align-clause checks of OpenMP's allocate directive

gcc/fortran/ChangeLog:

	* openmp.cc (resolve_omp_clauses): Check also for
	power of two.

libgomp/ChangeLog:

	* testsuite/libgomp.fortran/allocate-3.f90: Fix ALIGN
	usage, remove unused -fdump-tree-original.
	* testsuite/libgomp.fortran/allocate-4.f90: New.

diff --git a/gcc/fortran/openmp.cc b/gcc/fortran/openmp.cc
index 686f924b47a..5468cc97969 100644
--- a/gcc/fortran/openmp.cc
+++ b/gcc/fortran/openmp.cc
@@ -7315,11 +7315,12 @@ resolve_omp_clauses (gfc_code *code, gfc_omp_clauses *omp_clauses,
 	      || n->u.align->ts.type != BT_INTEGER
 	      || n->u.align->rank != 0
 	      || gfc_extract_int (n->u.align, &alignment)
-	      || alignment <= 0)
+	      || alignment <= 0
+	      || !pow2p_hwi (alignment))
 	    {
-	      gfc_error ("ALIGN modifier requires a scalar positive "
-			 "constant integer alignment expression at %L",
-			 &n->u.align->where);
+	      gfc_error ("ALIGN modifier requires at %L a scalar positive "
+			 "constant integer alignment expression that is a "
+			 "power of two", &n->u.align->where);
 	      break;
 	    }
 	}

diff --git a/libgomp/testsuite/libgomp.fortran/allocate-3.f90 b/libgomp/testsuite/libgomp.fortran/allocate-3.f90
index a39819164d6..1fa0bb932c3 100644
--- a/libgomp/testsuite/libgomp.fortran/allocate-3.f90
+++ b/libgomp/testsuite/libgomp.fortran/allocate-3.f90
@@ -1,5 +1,4 @@
 ! { dg-do compile }
-! { dg-additional-options "-fdump-tree-original" }
 
 use omp_lib
 implicit none
@@ -23,6 +22,7 @@ integer :: q, x,y,z
 ! { dg-error "Object 'omp_high_bw_mem_alloc' is not a variable" "" { target *-*-* } .-1 }
 !$omp end parallel
 
-!$omp parallel allocate( align(q) : x) firstprivate(x) ! { dg-error "31:ALIGN modifier requires a scalar positive constant integer alignment expression at" }
+!$omp parallel allocate( align(128) : x) firstprivate(x) ! OK
 !$omp end parallel
+
 end
diff --git a/libgomp/testsuite/libgomp.fortran/allocate-4.f90 b/libgomp/testsuite/libgomp.fortran/allocate-4.f90
new file mode 100644
index 00000000000..ddb507ba8e4
--- /dev/null
+++ b/libgomp/testsuite/libgomp.fortran/allocate-4.f90
@@ -0,0 +1,42 @@
+! { dg-do compile }
+
+
+subroutine test()
+use iso_c_binding, only: c_intptr_t
+implicit none
+integer, parameter :: omp_allocator_handle_kind = 1 !! <<<
+integer (kind=omp_allocator_handle_kind), &
+                 parameter :: omp_high_bw_mem_alloc = 4
+integer :: q, x,y,z
+integer, parameter :: cnst(2) = [64, 101]
+
+!$omp parallel allocate( omp_high_bw_mem_alloc : x)  firstprivate(x) ! { dg-error "Expected integer expression of the 'omp_allocator_handle_kind' kind" }
+!$omp end parallel
+
+!$omp parallel allocate( allocator (omp_high_bw_mem_alloc) : x)  firstprivate(x) ! { dg-error "Expected integer expression of the 'omp_allocator_handle_kind' kind" }
+!$omp end parallel
+
+!$omp parallel allocate( align (q) : x)  firstprivate(x) ! { dg-error "32:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+
+!$omp parallel allocate( align (32) : x)  firstprivate(x) ! OK
+!$omp end parallel
+
+!$omp parallel allocate( align(q) : x) firstprivate(x) ! { dg-error "31:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+
+!$omp parallel allocate( align(cnst(1)) : x ) firstprivate(x) ! OK
+!$omp end parallel
+
+!$omp parallel allocate( align(cnst(2)) : x) firstprivate(x)  ! { dg-error "31:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+
+!$omp parallel allocate( align( 31) :x) firstprivate(x)  ! { dg-error "32:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+
+!$omp parallel allocate( align (32.0): x) firstprivate(x)  ! { dg-error "32:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+
+!$omp parallel allocate( align(cnst ) : x ) firstprivate(x)  ! { dg-error "31:ALIGN modifier requires at \\(1\\) a scalar positive constant integer alignment expression that is a power of two" }
+!$omp end parallel
+end