From ed8e51ed5ef7da6a4f6f99c21fe7f37afb5666fe Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sat, 9 Aug 2025 19:48:01 +0100
Subject: [PATCH] core: bitop: add atomic compare-exchange

---
 core/include/blue/core/bitop.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/include/blue/core/bitop.h b/core/include/blue/core/bitop.h
index f6ddf59..079c4a3 100644
--- a/core/include/blue/core/bitop.h
+++ b/core/include/blue/core/bitop.h
@@ -7,4 +7,15 @@ BLUE_API int b_popcountl(long v);
 BLUE_API int b_ctzl(long v);
 BLUE_API int b_clzl(long v);
 
-#endif
\ No newline at end of file
+#if defined(__GNUC__) || defined(__clang__)
+#define b_cmpxchg(v, expected_val, new_val)                                    \
+	__atomic_compare_exchange_n(                                           \
+		v, expected_val, new_val, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED)
+#elif defined(_MSC_VER)
+/* TODO add MSVC support */
+#error MSVC intrinsics not yet supported
+#else
+#error Unsupported compiler
+#endif
+
+#endif