From ef9d76cf88282030c0ed269f73ab8f332f784437 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 24 Jul 2020 10:18:22 -0700
Subject: `InterlockedAdd` CPU intrinsic implementation. (#1455)

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>
---
 prelude/slang-cpp-scalar-intrinsics.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/prelude/slang-cpp-scalar-intrinsics.h b/prelude/slang-cpp-scalar-intrinsics.h
index 54900c3a3..ec3882cfb 100644
--- a/prelude/slang-cpp-scalar-intrinsics.h
+++ b/prelude/slang-cpp-scalar-intrinsics.h
@@ -264,6 +264,20 @@ SLANG_FORCE_INLINE int64_t I64_abs(int64_t f) { return (f < 0) ? -f : f; }
 SLANG_FORCE_INLINE int64_t I64_min(int64_t a, int64_t b) { return a < b ? a : b; }
 SLANG_FORCE_INLINE int64_t I64_max(int64_t a, int64_t b) { return a > b ? a : b; }
 
+
+// ----------------------------- Interlocked ---------------------------------
+#ifdef _WIN32
+#include <intrin.h>
+#endif
+
+void InterlockedAdd(uint32_t* dest, uint32_t value, uint32_t* oldValue)
+{
+#ifdef _WIN32
+    *oldValue = _InterlockedExchangeAdd((long*)dest, (long)value);
+#else
+    *oldValue = __sync_fetch_and_add(dest, value);
+#endif
+}
 #ifdef SLANG_PRELUDE_NAMESPACE
 } 
 #endif
-- 
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