[libc++][test][AIX] Only XFAIL atomic tests for before clang 19

[jakeegan]

These tests pass on 64-bit. They were fixed by 5fdd094 on 32-bit. So XFAIL only for 32-bit before clang 19.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Jake Egan (jakeegan)

Changes

These tests pass on 64-bit. They were fixed by 5fdd094 on 32-bit. So XFAIL only for 32-bit before clang 19.

---

Full diff: https://github.com/llvm/llvm-project/pull/94646.diff

4 Files Affected:

• (modified) libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp (+4-1)
• (modified) libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp (+4-1)
• (modified) libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp (+4-1)
• (modified) libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp (+4-1)

diff --git a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp
index 7350c1ddf0e90..40a475ec38b72 100644
--- a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp
@@ -6,9 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: LIBCXX-AIX-FIXME
 // XFAIL: !has-64-bit-atomics
 
+// Older versions of clang have a bug with atomic builtins affecting double and long double.
+// Fixed by 5fdd0948.
+// XFAIL: target=powerpc-ibm-{{.*}} && (clang-17 || clang-18)
+
 // https://github.com/llvm/llvm-project/issues/72893
 // XFAIL: target={{x86_64-.*}} && tsan
 
diff --git a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp
index 84dcde5f2784f..9e798a2a519ff 100644
--- a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp
@@ -6,9 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: LIBCXX-AIX-FIXME
 // XFAIL: !has-64-bit-atomics
 
+// Older versions of clang have a bug with atomic builtins affecting double and long double.
+// Fixed by 5fdd0948.
+// XFAIL: target=powerpc-ibm-{{.*}} && (clang-17 || clang-18)
+
 // https://github.com/llvm/llvm-project/issues/72893
 // XFAIL: target={{x86_64-.*}} && tsan
 
diff --git a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp
index 386a393e35503..732bd4d7e5dc2 100644
--- a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp
@@ -6,9 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: LIBCXX-AIX-FIXME
 // XFAIL: !has-64-bit-atomics
 
+// Older versions of clang have a bug with atomic builtins affecting double and long double.
+// Fixed by 5fdd0948.
+// XFAIL: target=powerpc-ibm-{{.*}} && (clang-17 || clang-18)
+
 // floating-point-type operator-=(floating-point-type) volatile noexcept;
 // floating-point-type operator-=(floating-point-type) noexcept;
 
diff --git a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp
index afd06d537c7ad..1821aca42c798 100644
--- a/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp
@@ -6,9 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: LIBCXX-AIX-FIXME
 // XFAIL: !has-64-bit-atomics
 
+// Older versions of clang have a bug with atomic builtins affecting double and long double.
+// Fixed by 5fdd0948.
+// XFAIL: target=powerpc-ibm-{{.*}} && (clang-17 || clang-18)
+
 // floating-point-type operator+=(floating-point-type) volatile noexcept;
 // floating-point-type operator+=(floating-point-type) noexcept;