[PR c/71381] C/C++ OpenACC cache directive rejects valid syntax

	gcc/c/
	PR c/71381
	* c-parser.c (c_parser_omp_variable_list) <OMP_CLAUSE__CACHE_>:
	Loosen checking.
	gcc/cp/
	PR c/71381
	* parser.c (cp_parser_omp_var_list_no_open) <OMP_CLAUSE__CACHE_>:
	Loosen checking.
	gcc/fortran/
	PR c/71381
	* openmp.c (gfc_match_oacc_cache): Add comment.
	gcc/testsuite/
	PR c/71381
	* c-c++-common/goacc/cache-1.c: Update.  Move invalid usage tests
	to...
	* c-c++-common/goacc/cache-2.c: ... this new file.
	* gfortran.dg/goacc/cache-1.f95: Move invalid usage tests to...
	* gfortran.dg/goacc/cache-2.f95: ... this new file.
	* gfortran.dg/goacc/coarray.f95: Update OpenACC cache directive
	usage.
	* gfortran.dg/goacc/cray.f95: Likewise.
	* gfortran.dg/goacc/loop-1.f95: Likewise.
	libgomp/
	PR c/71381
	* testsuite/libgomp.oacc-c-c++-common/cache-1.c: #include
	"../../../gcc/testsuite/c-c++-common/goacc/cache-1.c".
	* testsuite/libgomp.oacc-fortran/cache-1.f95: New file.

	gcc/
	* omp-low.c (scan_sharing_clauses): Don't expect
	OMP_CLAUSE__CACHE_.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@237290 138bc75d-0d04-0410-961f-82ee72b054a4

19 files changed, 159 insertions, 144 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3f7240cf92f..6afbae76146 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* omp-low.c (scan_sharing_clauses): Don't expect
+	OMP_CLAUSE__CACHE_.
+
 2016-06-10  Alan Hayward  <alan.hayward@arm.com>
 
 	PR tree-optimization/71407
diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog
index 4d302453ee4..cd9f230e106 100644
--- a/gcc/c/ChangeLog
+++ b/gcc/c/ChangeLog
@@ -1,3 +1,9 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR c/71381
+	* c-parser.c (c_parser_omp_variable_list) <OMP_CLAUSE__CACHE_>:
+	Loosen checking.
+
 2016-06-08  Martin Sebor  <msebor@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 
diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
index 2fef1acebd1..94078a91f4c 100644
--- a/gcc/c/c-parser.c
+++ b/gcc/c/c-parser.c
@@ -10613,6 +10613,8 @@ c_parser_omp_variable_list (c_parser *parser,
 	  switch (kind)
 	    {
 	    case OMP_CLAUSE__CACHE_:
+	      /* The OpenACC cache directive explicitly only allows "array
+		 elements or subarrays".  */
 	      if (c_parser_peek_token (parser)->type != CPP_OPEN_SQUARE)
 		{
 		  c_parser_error (parser, "expected %<[%>");
@@ -10678,25 +10680,6 @@ c_parser_omp_variable_list (c_parser *parser,
 		      break;
 		    }
 
-		  if (kind == OMP_CLAUSE__CACHE_)
-		    {
-		      if (TREE_CODE (low_bound) != INTEGER_CST
-			  && !TREE_READONLY (low_bound))
-			{
-			  error_at (clause_loc,
-				    "%qD is not a constant", low_bound);
-			  t = error_mark_node;
-			}
-
-		      if (TREE_CODE (length) != INTEGER_CST
-			  && !TREE_READONLY (length))
-			{
-			  error_at (clause_loc,
-				    "%qD is not a constant", length);
-			  t = error_mark_node;
-			}
-		    }
-
 		  t = tree_cons (low_bound, length, t);
 		}
 	      break;
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index a94cebea7dc..53d55d3b3a6 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR c/71381
+	* parser.c (cp_parser_omp_var_list_no_open) <OMP_CLAUSE__CACHE_>:
+	Loosen checking.
+
 2016-06-09  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/71465
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index e01353d5dc1..632b25fac95 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -29984,6 +29984,8 @@ cp_parser_omp_var_list_no_open (cp_parser *parser, enum omp_clause_code kind,
 	  switch (kind)
 	    {
 	    case OMP_CLAUSE__CACHE_:
+	      /* The OpenACC cache directive explicitly only allows "array
+		 elements or subarrays".  */
 	      if (cp_lexer_peek_token (parser->lexer)->type != CPP_OPEN_SQUARE)
 		{
 		  error_at (token->location, "expected %<[%>");
@@ -30035,25 +30037,6 @@ cp_parser_omp_var_list_no_open (cp_parser *parser, enum omp_clause_code kind,
 					  RT_CLOSE_SQUARE))
 		    goto skip_comma;
 
-		  if (kind == OMP_CLAUSE__CACHE_)
-		    {
-		      if (TREE_CODE (low_bound) != INTEGER_CST
-			  && !TREE_READONLY (low_bound))
-			{
-			  error_at (token->location,
-				    "%qD is not a constant", low_bound);
-			  decl = error_mark_node;
-			}
-
-		      if (TREE_CODE (length) != INTEGER_CST
-			  && !TREE_READONLY (length))
-			{
-			  error_at (token->location,
-				    "%qD is not a constant", length);
-			  decl = error_mark_node;
-			}
-		    }
-
 		  decl = tree_cons (low_bound, length, decl);
 		}
 	      break;
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index b2354e7c203..67bc9e88621 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,8 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR c/71381
+	* openmp.c (gfc_match_oacc_cache): Add comment.
+
 2016-06-05  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/71404
diff --git a/gcc/fortran/openmp.c b/gcc/fortran/openmp.c
index 2689d302c77..2c9279401a2 100644
--- a/gcc/fortran/openmp.c
+++ b/gcc/fortran/openmp.c
@@ -1688,6 +1688,10 @@ match
 gfc_match_oacc_cache (void)
 {
   gfc_omp_clauses *c = gfc_get_omp_clauses ();
+  /* The OpenACC cache directive explicitly only allows "array elements or
+     subarrays", which we're currently not checking here.  Either check this
+     after the call of gfc_match_omp_variable_list, or add something like a
+     only_sections variant next to its allow_sections parameter.  */
   match m = gfc_match_omp_variable_list (" (",
 					 &c->lists[OMP_LIST_CACHE], true,
 					 NULL, NULL, true);
diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index 77bdb1810e6..91d5fcfcab0 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -2201,9 +2201,6 @@ scan_sharing_clauses (tree clauses, omp_context *ctx,
 	  break;
 
 	case OMP_CLAUSE__CACHE_:
-	  sorry ("Clause not supported yet");
-	  break;
-
 	default:
 	  gcc_unreachable ();
 	}
@@ -2368,9 +2365,6 @@ scan_sharing_clauses (tree clauses, omp_context *ctx,
 	  break;
 
 	case OMP_CLAUSE__CACHE_:
-	  sorry ("Clause not supported yet");
-	  break;
-
 	default:
 	  gcc_unreachable ();
 	}
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ae3f462cbb0..e15b009b425 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,16 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR c/71381
+	* c-c++-common/goacc/cache-1.c: Update.  Move invalid usage tests
+	to...
+	* c-c++-common/goacc/cache-2.c: ... this new file.
+	* gfortran.dg/goacc/cache-1.f95: Move invalid usage tests to...
+	* gfortran.dg/goacc/cache-2.f95: ... this new file.
+	* gfortran.dg/goacc/coarray.f95: Update OpenACC cache directive
+	usage.
+	* gfortran.dg/goacc/cray.f95: Likewise.
+	* gfortran.dg/goacc/loop-1.f95: Likewise.
+
 2016-06-10  Alan Hayward  <alan.hayward@arm.com>
 
 	PR tree-optimization/71407
diff --git a/gcc/testsuite/c-c++-common/goacc/cache-1.c b/gcc/testsuite/c-c++-common/goacc/cache-1.c
index 950334102db..1d4759e738c 100644
--- a/gcc/testsuite/c-c++-common/goacc/cache-1.c
+++ b/gcc/testsuite/c-c++-common/goacc/cache-1.c
@@ -1,3 +1,7 @@
+/* OpenACC cache directive: valid usage.  */
+/* For execution testing, this file is "#include"d from
+   libgomp/testsuite/libgomp.oacc-c-c++-common/cache-1.c.  */
+
 int
 main (int argc, char **argv)
 {
@@ -21,57 +25,31 @@ main (int argc, char **argv)
         int n = 1;
         const int len = n;
 
-#pragma acc cache /* { dg-error "expected '\\\(' before end of line" } */
-
-#pragma acc cache a[0:N] /* { dg-error "expected '\\\(' before 'a'" } */
-	/* { dg-bogus "expected end of line before 'a'" "" { xfail c++ } 26 } */
-
-#pragma acc cache (a) /* { dg-error "expected '\\\['" } */
-
-#pragma acc cache ( /* { dg-error "expected (identifier|unqualified-id) before end of line" } */
-
-#pragma acc cache () /* { dg-error "expected (identifier|unqualified-id) before '\\\)' token" } */
-
-#pragma acc cache (,) /* { dg-error "expected (identifier|unqualified-id) before '(,|\\\))' token" } */
-
-#pragma acc cache (a[0:N] /* { dg-error "expected '\\\)' before end of line" } */
-
-#pragma acc cache (a[0:N],) /* { dg-error "expected (identifier|unqualified-id) before '(,|\\\))' token" "" { xfail c } } */
-
-#pragma acc cache (a[0:N]) copyin (a[0:N]) /* { dg-error "expected end of line before 'copyin'" } */
-
-#pragma acc cache () /* { dg-error "expected (identifier|unqualified-id) before '\\\)' token" } */
-
-#pragma acc cache (a[0:N] b[0:N]) /* { dg-error "expected '\\\)' before 'b'" } */
-
-#pragma acc cache (a[0:N] b[0:N}) /* { dg-error "expected '\\\)' before 'b'" } */
-	/* { dg-bogus "expected end of line before '\\\}' token" "" { xfail c++ } 47 } */
-
-#pragma acc cache (a[0:N] /* { dg-error "expected '\\\)' before end of line" } */
-
-#pragma acc cache (a[ii]) /* { dg-error "'ii' is not a constant" } */
-
-#pragma acc cache (a[idx:n]) /* { dg-error "'n' is not a constant" } */
-
-#pragma acc cache (a[0:N]) ( /* { dg-error "expected end of line before '\\(' token" } */
-
-#pragma acc cache (a[0:N]) ii /* { dg-error "expected end of line before 'ii'" } */
-
-#pragma acc cache (a[0:N] ii) /* { dg-error "expected '\\)' before 'ii'" } */
-
+	/* Have at it, GCC!  */
 #pragma acc cache (a[0:N])
-
 #pragma acc cache (a[0:N], a[0:N])
-
 #pragma acc cache (a[0:N], b[0:N])
-
 #pragma acc cache (a[0])
-
 #pragma acc cache (a[0], a[1], b[0:N])
-
+#pragma acc cache (a[i - 5])
+#pragma acc cache (a[i + 5:len])
+#pragma acc cache (a[i + 5:len - 1])
+#pragma acc cache (b[i])
+#pragma acc cache (b[i:len])
+#pragma acc cache (a[ii])
+#pragma acc cache (a[ii:len])
+#pragma acc cache (b[ii - 1])
+#pragma acc cache (b[ii - 1:len])
+#pragma acc cache (b[i - ii + 1])
+#pragma acc cache (b[i + ii - 1:len])
+#pragma acc cache (b[i * ii - 1:len + 1])
+#pragma acc cache (a[idx + 2])
+#pragma acc cache (a[idx:len + 2])
 #pragma acc cache (a[idx])
-
 #pragma acc cache (a[idx:len])
+#pragma acc cache (a[idx + 2:len])
+#pragma acc cache (a[idx + 2 + i:len])
+#pragma acc cache (a[idx + 2 + i + ii:len])
 
         b[ii] = a[ii];
     }
diff --git a/gcc/testsuite/c-c++-common/goacc/cache-2.c b/gcc/testsuite/c-c++-common/goacc/cache-2.c
new file mode 100644
index 00000000000..f7175157915
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/goacc/cache-2.c
@@ -0,0 +1,57 @@
+/* OpenACC cache directive: invalid usage.  */
+
+int
+main (int argc, char **argv)
+{
+#define N   2
+    int a[N], b[N];
+    int i;
+
+    for (i = 0; i < N; i++)
+    {
+        a[i] = 3;
+        b[i] = 0;
+    }
+
+#pragma acc parallel copyin (a[0:N]) copyout (b[0:N])
+{
+    int ii;
+
+    for (ii = 0; ii < N; ii++)
+    {
+        const int idx = ii;
+        int n = 1;
+        const int len = n;
+
+#pragma acc cache /* { dg-error "expected '\\\(' before end of line" } */
+#pragma acc cache a[0:N] /* { dg-error "expected '\\\(' before 'a'" } */
+	/* { dg-bogus "expected end of line before 'a'" "" { xfail c++ } 27 } */
+#pragma acc cache (a) /* { dg-error "expected '\\\['" } */
+#pragma acc cache ( /* { dg-error "expected (identifier|unqualified-id) before end of line" } */
+#pragma acc cache () /* { dg-error "expected (identifier|unqualified-id) before '\\\)' token" } */
+#pragma acc cache (,) /* { dg-error "expected (identifier|unqualified-id) before '(,|\\\))' token" } */
+#pragma acc cache (a[0:N] /* { dg-error "expected '\\\)' before end of line" } */
+#pragma acc cache (a[0:N],) /* { dg-error "expected (identifier|unqualified-id) before '(,|\\\))' token" "" { xfail c } } */
+#pragma acc cache (a[0:N]) copyin (a[0:N]) /* { dg-error "expected end of line before 'copyin'" } */
+#pragma acc cache () /* { dg-error "expected (identifier|unqualified-id) before '\\\)' token" } */
+#pragma acc cache (a[0:N] b[0:N]) /* { dg-error "expected '\\\)' before 'b'" } */
+#pragma acc cache (a[0:N] b[0:N}) /* { dg-error "expected '\\\)' before 'b'" } */
+	/* { dg-bogus "expected end of line before '\\\}' token" "" { xfail c++ } 38 } */
+#pragma acc cache (a[0:N] /* { dg-error "expected '\\\)' before end of line" } */
+#pragma acc cache (a[0:N]) ( /* { dg-error "expected end of line before '\\(' token" } */
+#pragma acc cache (a[0:N]) ii /* { dg-error "expected end of line before 'ii'" } */
+#pragma acc cache (a[0:N] ii) /* { dg-error "expected '\\)' before 'ii'" } */
+
+        b[ii] = a[ii];
+    }
+}
+
+
+    for (i = 0; i < N; i++)
+    {
+        if (a[i] != b[i])
+            __builtin_abort ();
+    }
+
+    return 0;
+}
diff --git a/gcc/testsuite/gfortran.dg/goacc/cache-1.f95 b/gcc/testsuite/gfortran.dg/goacc/cache-1.f95
index 2aa9e053627..39fbf2cf55a 100644
--- a/gcc/testsuite/gfortran.dg/goacc/cache-1.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/cache-1.f95
@@ -1,4 +1,6 @@
-! { dg-do compile }
+! OpenACC cache directive: valid usage.
+! For execution testing, this file is "#include"d from
+! libgomp/testsuite/libgomp.oacc-fortran/cache-1.f95.
 ! { dg-additional-options "-std=f2008" }
 
 program test
@@ -6,11 +8,8 @@ program test
   integer :: i, d(10), e(5,13)
 
   do concurrent (i=1:5)
-    !$acc cache (d)
     !$acc cache (d(1:3))
     !$acc cache (d(i:i+2))
-
-    !$acc cache (e)
     !$acc cache (e(1:3,2:4))
     !$acc cache (e(i:i+2,i+1:i+3))
   enddo
diff --git a/gcc/testsuite/gfortran.dg/goacc/cache-2.f95 b/gcc/testsuite/gfortran.dg/goacc/cache-2.f95
new file mode 100644
index 00000000000..be818788556
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/goacc/cache-2.f95
@@ -0,0 +1,12 @@
+! OpenACC cache directive: invalid usage.
+! { dg-additional-options "-std=f2008" }
+
+program test
+  implicit none
+  integer :: i, d(10), e(5,13)
+
+  do concurrent (i=1:5)
+    !$acc cache (d) ! { dg-error "" "TODO" { xfail *-*-* } }
+    !$acc cache (e) ! { dg-error "" "TODO" { xfail *-*-* } }
+  enddo
+end
diff --git a/gcc/testsuite/gfortran.dg/goacc/coarray.f95 b/gcc/testsuite/gfortran.dg/goacc/coarray.f95
index 932e1f7fd0d..f30917b8a9c 100644
--- a/gcc/testsuite/gfortran.dg/goacc/coarray.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/coarray.f95
@@ -24,7 +24,7 @@ contains
     !$acc end parallel loop
     !$acc parallel loop
     do i = 1,5
-      !$acc cache (a)
+      !$acc cache (a) ! { dg-error "" "TODO" { xfail *-*-* } }
     enddo
     !$acc end parallel loop
     !$acc update device (a)
diff --git a/gcc/testsuite/gfortran.dg/goacc/cray.f95 b/gcc/testsuite/gfortran.dg/goacc/cray.f95
index a35ab0dc995..705c18c992d 100644
--- a/gcc/testsuite/gfortran.dg/goacc/cray.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/cray.f95
@@ -44,7 +44,8 @@ contains
     !$acc end parallel loop
     !$acc parallel loop
     do i = 1,5
-      !$acc cache (ptr) ! TODO: This must fail, as in openacc-1_0-branch
+      !TODO: This must fail, as in openacc-1_0-branch.
+      !$acc cache (ptr) ! { dg-error "" "TODO" { xfail *-*-* } }
     enddo
     !$acc end parallel loop
     !$acc update device (ptr)
diff --git a/gcc/testsuite/gfortran.dg/goacc/loop-1.f95 b/gcc/testsuite/gfortran.dg/goacc/loop-1.f95
index b5f9e038145..a605f038926 100644
--- a/gcc/testsuite/gfortran.dg/goacc/loop-1.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/loop-1.f95
@@ -158,15 +158,16 @@ subroutine test1
   enddo
 
 
-  !$acc cache (a) ! { dg-error "inside of loop" }
+  !$acc cache (a(1:10)) ! { dg-error "ACC CACHE directive must be inside of loop" }
 
   do i = 1,10
-    !$acc cache(a)
+    !$acc cache(a(i:i+1))
   enddo
 
   do i = 1,10
+    !$acc cache(a(i:i+1))
     a(i) = i
-    !$acc cache(a) 
+    !$acc cache(a(i+2:i+2+1))
   enddo
 
 end subroutine test1
diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index f6d7dd2a808..5c7f41abf89 100644
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,10 @@
+2016-06-10  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR c/71381
+	* testsuite/libgomp.oacc-c-c++-common/cache-1.c: #include
+	"../../../gcc/testsuite/c-c++-common/goacc/cache-1.c".
+	* testsuite/libgomp.oacc-fortran/cache-1.f95: New file.
+
 2016-06-03  Chung-Lin Tang  <cltang@codesourcery.com>
 
 	* testsuite/libgomp.oacc-fortran/reduction-8.f90: New testcase.
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/cache-1.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/cache-1.c
index 3f1f0bb3764..16aaed5df70 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/cache-1.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/cache-1.c
@@ -1,48 +1,3 @@
-int
-main (int argc, char **argv)
-{
-#define N   2
-    int a[N], b[N];
-    int i;
+/* OpenACC cache directive.  */
 
-    for (i = 0; i < N; i++)
-    {
-        a[i] = 3;
-        b[i] = 0;
-    }
-
-#pragma acc parallel copyin (a[0:N]) copyout (b[0:N])
-{
-    int ii;
-
-    for (ii = 0; ii < N; ii++)
-    {
-        const int idx = ii;
-        int n = 1;
-        const int len = n;
-
-#pragma acc cache (a[0:N])
-
-#pragma acc cache (a[0:N], b[0:N])
-
-#pragma acc cache (a[0])
-
-#pragma acc cache (a[0], a[1], b[0:N])
-
-#pragma acc cache (a[idx])
-
-#pragma acc cache (a[idx:len])
-
-        b[ii] = a[ii];
-    }
-}
-
-
-    for (i = 0; i < N; i++)
-    {
-        if (a[i] != b[i])
-            __builtin_abort ();
-    }
-
-    return 0;
-}
+#include "../../../gcc/testsuite/c-c++-common/goacc/cache-1.c"
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/cache-1.f95 b/libgomp/testsuite/libgomp.oacc-fortran/cache-1.f95
new file mode 100644
index 00000000000..37313d8c44a
--- /dev/null
+++ b/libgomp/testsuite/libgomp.oacc-fortran/cache-1.f95
@@ -0,0 +1,6 @@
+! OpenACC cache directive.
+! { dg-do run }
+! { dg-additional-options "-std=f2008" }
+! { dg-additional-options "-cpp" }
+
+#include "../../../gcc/testsuite/gfortran.dg/goacc/cache-1.f95"