[PATCH, libgomp, openacc] Factor out async argument utility functions

[Tom de Vries]

Hi,

I've factored out 3 new functions to test properties of enum acc_async_t:
...
typedef enum acc_async_t {
  /* Keep in sync with include/gomp-constants.h.  */
  acc_async_noval = -1,
  acc_async_sync  = -2
} acc_async_t;
...

In order to understand what this means:
...
  if (async < acc_async_noval) 

...
you need to know the names and values of the enum.

Using the factored out functions, we get something that is easier to 
understand:
...
  if (async_synchronous_p (async)) 

...

Also I've changed the bodies of the functions to be robust against 
changes in values of acc_async_noval and acc_async_sync. No functional 
changes.

Build and tested on x86_64 with nvptx accelerator.

OK for trunk if bootstrap and reg-test on x86_64 succeeds?

Thanks,
- Tom
Factor out async argument utility functions

2017-11-17  Tom de Vries  <t...@codesourcery.com>

	* oacc-int.h (async_valid_stream_id_p, async_valid_p)
	(async_synchronous_p): New function.
	* oacc-async.c (acc_async_test, acc_wait, acc_wait_all_async): Use
	async_valid_p.
	* oacc-cuda.c (acc_get_cuda_stream, acc_set_cuda_stream): Use
	async_valid_stream_id_p.
	* oacc-mem.c (gomp_acc_remove_pointer): Use async_synchronous_p.
	* oacc-parallel.c (GOACC_parallel_keyed): Same.

---
 libgomp/oacc-async.c    |  6 +++---
 libgomp/oacc-cuda.c     |  4 ++--
 libgomp/oacc-int.h      | 22 ++++++++++++++++++++++
 libgomp/oacc-mem.c      |  2 +-
 libgomp/oacc-parallel.c |  2 +-
 5 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/libgomp/oacc-async.c b/libgomp/oacc-async.c
index 1334f99..f541b44 100644
--- a/libgomp/oacc-async.c
+++ b/libgomp/oacc-async.c
@@ -34,7 +34,7 @@
 int
 acc_async_test (int async)
 {
-  if (async < acc_async_sync)
+  if (!async_valid_p (async))
     gomp_fatal ("invalid async argument: %d", async);
 
   struct goacc_thread *thr = goacc_thread ();
@@ -59,7 +59,7 @@ acc_async_test_all (void)
 void
 acc_wait (int async)
 {
-  if (async < acc_async_sync)
+  if (!async_valid_p (async))
     gomp_fatal ("invalid async argument: %d", async);
 
   struct goacc_thread *thr = goacc_thread ();
@@ -117,7 +117,7 @@ acc_async_wait_all (void)
 void
 acc_wait_all_async (int async)
 {
-  if (async < acc_async_sync)
+  if (!async_valid_p (async))
     gomp_fatal ("invalid async argument: %d", async);
 
   struct goacc_thread *thr = goacc_thread ();
diff --git a/libgomp/oacc-cuda.c b/libgomp/oacc-cuda.c
index ac9285f..97bc961 100644
--- a/libgomp/oacc-cuda.c
+++ b/libgomp/oacc-cuda.c
@@ -58,7 +58,7 @@ acc_get_cuda_stream (int async)
 {
   struct goacc_thread *thr = goacc_thread ();
 
-  if (async < 0)
+  if (!async_valid_stream_id_p (async))
     return NULL;
 
   if (thr && thr->dev && thr->dev->openacc.cuda.get_stream_func)
@@ -72,7 +72,7 @@ acc_set_cuda_stream (int async, void *stream)
 {
   struct goacc_thread *thr;
 
-  if (async < 0 || stream == NULL)
+  if (!async_valid_stream_id_p (async) || stream == NULL)
     return 0;
 
   goacc_lazy_initialize ();
diff --git a/libgomp/oacc-int.h b/libgomp/oacc-int.h
index cb14f09..f553267 100644
--- a/libgomp/oacc-int.h
+++ b/libgomp/oacc-int.h
@@ -99,6 +99,28 @@ void goacc_restore_bind (void);
 void goacc_lazy_initialize (void);
 void goacc_host_init (void);
 
+static inline bool
+async_valid_stream_id_p (int async)
+{
+  return async >= 0;
+}
+
+static inline bool
+async_valid_p (int async)
+{
+  return (async == acc_async_noval || async == acc_async_sync
+	  || async_valid_stream_id_p (async));
+}
+
+static inline bool
+async_synchronous_p (int async)
+{
+  if (!async_valid_p (async))
+    return true;
+
+  return async == acc_async_sync;
+}
+
 #ifdef HAVE_ATTRIBUTE_VISIBILITY
 # pragma GCC visibility pop
 #endif
diff --git a/libgomp/oacc-mem.c b/libgomp/oacc-mem.c
index ff3ed49..12558b8 100644
--- a/libgomp/oacc-mem.c
+++ b/libgomp/oacc-mem.c
@@ -723,7 +723,7 @@ gomp_acc_remove_pointer (void *h, bool force_copyfrom, int async, int mapnum)
   gomp_mutex_unlock (&acc_dev->lock);
 
   /* If running synchronously, unmap immediately.  */
-  if (async < acc_async_noval)
+  if (async_synchronous_p (async))
     gomp_unmap_vars (t, true);
   else
     t->device_descr->openacc.register_async_cleanup_func (t, async);
diff --git a/libgomp/oacc-parallel.c b/libgomp/oacc-parallel.c
index a8cff9e..baf44ec 100644
--- a/libgomp/oacc-parallel.c
+++ b/libgomp/oacc-parallel.c
@@ -183,7 +183,7 @@ GOACC_parallel_keyed (int device, void (*fn) (void *),
 			      async, dims, tgt);
 
   /* If running synchronously, unmap immediately.  */
-  if (async < acc_async_noval)
+  if (async_synchronous_p (async))
     gomp_unmap_vars (tgt, true);
   else
     tgt->device_descr->openacc.register_async_cleanup_func (tgt, async);