[COMMITTED] testsuite: xtensa: add support for effective_target_sync_*

[Max Filippov]

Add new function check_effective_target_xtensa_atomic and use it in the
check_effective_target_sync_int_long and
check_effective_target_sync_char_short.

gcc/testsuite/ChangeLog:

        * lib/target-supports.exp
        (check_effective_target_xtensa_atomic): New function.
        (check_effective_target_sync_int_long)
        (check_effective_target_sync_char_short): Add test for xtensa.
---
 gcc/testsuite/lib/target-supports.exp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 287e51bbfc66..24d0b3d08e34 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -10145,6 +10145,7 @@ proc check_effective_target_sync_int_long { } {
             || ([istarget arc*-*-*] && [check_effective_target_arc_atomic])
             || [check_effective_target_mips_llsc]
             || [istarget nvptx*-*-*]
+            || ([istarget xtensa*-*-*] && 
[check_effective_target_xtensa_atomic])
         }}]
 }
 
@@ -10182,7 +10183,9 @@ proc check_effective_target_sync_char_short { } {
             || ([istarget riscv*-*-*]
                 && ([check_effective_target_riscv_zalrsc]
                     || [check_effective_target_riscv_zabha]))
-            || [check_effective_target_mips_llsc] }}]
+            || [check_effective_target_mips_llsc]
+            || ([istarget xtensa*-*-*] && 
[check_effective_target_xtensa_atomic])
+        }}]
 }
 
 # Return 1 if thread_fence does not rely on __sync_synchronize
@@ -14407,3 +14410,12 @@ proc 
check_effective_target_speculation_barrier_defined { } {
            }
        }]
 }
+
+# Return 1 if this is a compiler supporting Xtensa atomic operations
+proc check_effective_target_xtensa_atomic { } {
+    return [check_no_compiler_messages xtensa_atomic assembly {
+       #if __XCHAL_HAVE_S32C1I != 1 && __XCHAL_HAVE_EXCLUSIVE != 1
+       #error FOO
+       #endif
+    }]
+}
-- 
2.39.5