[gcc r11-9338] openmp: Fix up handling of kind(host) and kind(nohost) in ACCEL_COMPILERs [PR103384]

[gcc r11-9338] openmp: Fix up handling of kind(host) and kind(nohost) in ACCEL_COMPILERs [PR103384]

[Jakub Jelinek]

https://gcc.gnu.org/g:333b0dc1792f48e822ebaaea6e104539918f47f2

commit r11-9338-g333b0dc1792f48e822ebaaea6e104539918f47f2
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Nov 24 10:30:32 2021 +0100

    openmp: Fix up handling of kind(host) and kind(nohost) in ACCEL_COMPILERs [PR103384]
    
    As the testcase shows, we weren't handling kind(host) and kind(nohost) properly
    in the ACCEL_COMPILERs, the code written in there is valid for the host
    compiler only, where if we are maybe offloaded, we defer resolution after IPA,
    otherwise return 0 for kind(nohost) and accept it for kind(host).  Note,
    omp_maybe_offloaded is false after IPA.  If ACCEL_COMPILER is defined, it is
    the other way around, but also we know we are after IPA.
    
    2021-11-24  Jakub Jelinek  <jakub@redhat.com>
    
            PR middle-end/103384
    gcc/
            * omp-general.c (omp_context_selector_matches): For ACCEL_COMPILER,
            return 0 for kind(host) and continue for kind(nohost).
    libgomp/
            * testsuite/libgomp.c/declare-variant-2.c: New test.
    
    (cherry picked from commit 5bca26742cf3357bf4e20ec97eee4c7f7de17ce0)

Diff:
---
 gcc/omp-general.c                               |  6 ++++
 libgomp/testsuite/libgomp.c/declare-variant-2.c | 45 +++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/gcc/omp-general.c b/gcc/omp-general.c
index fa6de01722b..65d151e496c 100644
--- a/gcc/omp-general.c
+++ b/gcc/omp-general.c
@@ -1328,16 +1328,22 @@ omp_context_selector_matches (tree ctx)
 		      continue;
 		    if (!strcmp (prop, "host"))
 		      {
+#ifdef ACCEL_COMPILER
+			return 0;
+#else
 			if (omp_maybe_offloaded ())
 			  ret = -1;
 			continue;
+#endif
 		      }
 		    if (!strcmp (prop, "nohost"))
 		      {
+#ifndef ACCEL_COMPILER
 			if (omp_maybe_offloaded ())
 			  ret = -1;
 			else
 			  return 0;
+#endif
 			continue;
 		      }
 		    int r = 0;
diff --git a/libgomp/testsuite/libgomp.c/declare-variant-2.c b/libgomp/testsuite/libgomp.c/declare-variant-2.c
new file mode 100644
index 00000000000..666ab20ea5f
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/declare-variant-2.c
@@ -0,0 +1,45 @@
+/* { dg-do run } */
+
+#include <omp.h>
+#include <stdlib.h>
+
+void
+foo_host (void)
+{
+  if (!omp_is_initial_device ())
+    abort ();
+}
+
+#pragma omp declare variant (foo_host) match (device={kind(host)})
+void
+foo (void)
+{
+  if (omp_is_initial_device ())
+    abort ();
+}
+
+void
+bar_nohost (void)
+{
+  if (omp_is_initial_device ())
+    abort ();
+}
+
+#pragma omp declare variant (bar_nohost) match (device={kind(nohost)})
+void
+bar (void)
+{
+  if (!omp_is_initial_device ())
+    abort ();
+}
+
+int
+main ()
+{
+  #pragma omp target
+  {
+    foo ();
+    bar ();
+  }
+  return 0;
+}