[PATCH][testsuite, nvptx] Add effective target sync_int_long_stack

[Tom de Vries]

Hi,

The nvptx target currently doesn't support effective target sync_int_long,
although it has support for 32-bit and 64-bit atomic.

When enabling sync_int_long for nvptx, we run into a failure in
gcc.dg/pr86314.c:
...
 nvptx-run: error getting kernel result: operation not supported on \
   global/shared address space
...
due to a ptx restriction:  accesses to local memory are illegal, and the
test-case does an atomic operation on a stack address, which is mapped to
local memory.

Fix this by adding a target sync_int_long_stack, wich returns false for nvptx,
which can be used to mark test-cases that require sync_int_long support for
stack address.

Build on nvptx and tested with make check-gcc.

OK for trunk?

Thanks,
- Tom

[testsuite, nvptx] Add effective target sync_int_long_stack

gcc/testsuite/ChangeLog:

        PR target/96494
        * lib/target-supports.exp (check_effective_target_sync_int_long):
        Return 1 for nvptx.
        (check_effective_target_sync_int_long_stack): New proc.
        * gcc.dg/pr86314.c: Require effective target sync_int_long_stack.

---
 gcc/testsuite/gcc.dg/pr86314.c        |  2 +-
 gcc/testsuite/lib/target-supports.exp | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/pr86314.c b/gcc/testsuite/gcc.dg/pr86314.c
index 8962a3cf2ff..565fb02eee2 100644
--- a/gcc/testsuite/gcc.dg/pr86314.c
+++ b/gcc/testsuite/gcc.dg/pr86314.c
@@ -1,5 +1,5 @@
 // PR target/86314
-// { dg-do run { target sync_int_long } }
+// { dg-do run { target sync_int_long_stack } }
 // { dg-options "-O2" }
 
 __attribute__((noinline, noclone)) unsigned long
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index e79015b4d54..a870b1de275 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -7704,7 +7704,16 @@ proc check_effective_target_sync_int_long { } {
             || [istarget cris-*-*]
             || ([istarget sparc*-*-*] && [check_effective_target_sparc_v9])
             || ([istarget arc*-*-*] && [check_effective_target_arc_atomic])
-            || [check_effective_target_mips_llsc] }}]
+            || [check_effective_target_mips_llsc]
+            || [istarget nvptx*-*-*]
+        }}]
+}
+
+proc check_effective_target_sync_int_long_stack { } {
+    return [check_cached_effective_target sync_int_long_stack {
+      expr { ![istarget nvptx*-*-*]
+            && [check_effective_target_sync_int_long]       
+        }}]
 }
 
 # Return 1 if the target supports atomic operations on "char" and "short".