[libcxx] Update 128-bit-atomics feature test (#83841)

The `128-bit-atomics` libcxx feature is incorrectly named because tests
that are Xfailed with it is really using `int[128]`. Additionally,
because toolchain support for that feature is determined based on a much
smaller size (`char[16]`), tests would execute incorrectly without
required toolchain support.

So, rename `128-bit-atomics` as `1024-bit-atomics`, and use an
appropriate type to check for the presence of the feature.

Author: amilendra

libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp

@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++03
-// REQUIRES: has-128-bit-atomics
+// REQUIRES: has-1024-bit-atomics
 // ADDITIONAL_COMPILE_FLAGS: -Wno-psabi
 // ... since C++20 std::__atomic_base initializes, so we get a warning about an
 // ABI change for vector variants since the constructor code for that is

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
 // <atomic>

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // <atomic>
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp

@@ -8,7 +8,7 @@
 //
 // UNSUPPORTED: no-threads
 // XFAIL: c++03
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // XFAIL: availability-synchronization_library-missing
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp

@@ -8,7 +8,7 @@
 //
 // UNSUPPORTED: no-threads
 // XFAIL: c++03
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // XFAIL: availability-synchronization_library-missing
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp

@@ -8,7 +8,7 @@
 //
 // UNSUPPORTED: no-threads
 // XFAIL: c++03
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // XFAIL: availability-synchronization_library-missing
 

libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp

@@ -8,7 +8,7 @@
 //
 // UNSUPPORTED: no-threads
 // XFAIL: c++03
-// XFAIL: !has-128-bit-atomics
+// XFAIL: !has-1024-bit-atomics
 
 // XFAIL: availability-synchronization_library-missing
 

libcxx/utils/libcxx/test/features.py

@@ -171,12 +171,12 @@ def _getAndroidDeviceApi(cfg):
         ),
     ),
     Feature(
-        name="has-128-bit-atomics",
+        name="has-1024-bit-atomics",
         when=lambda cfg: sourceBuilds(
             cfg,
             """
             #include <atomic>
-            struct Large { char storage[128/8]; };
+            struct Large { int storage[1024/8]; };
             std::atomic<Large> x;
             int main(int, char**) { (void)x.load(); (void)x.is_lock_free(); return 0; }
           """,