From eb579fd7d6d9772ab8f16b2ef7fcd71b5b3b6aba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Widera?= <r.widera@hzdr.de>
Date: Fri, 29 Jul 2022 10:25:14 +0200
Subject: [PATCH] HIP: workaround atomicMax and atomicMin

For architectures where __hip_atomic_compare_exchange_strong is false
HIP is emulating atomics with `atomicCAS` but with a broken
implementation.
---
 .../alpaka/atomic/AtomicUniformCudaHip.hpp    | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/alpaka/atomic/AtomicUniformCudaHip.hpp b/include/alpaka/atomic/AtomicUniformCudaHip.hpp
index 6c61eb53b166..0d09d9652d0c 100644
--- a/include/alpaka/atomic/AtomicUniformCudaHip.hpp
+++ b/include/alpaka/atomic/AtomicUniformCudaHip.hpp
@@ -222,6 +222,18 @@ inline namespace alpakaGlobal
     struct AlpakaBuiltInAtomic<alpaka::AtomicMin, double, alpaka::hierarchy::Threads> : std::false_type
     {
     };
+
+#            if !__has_builtin(__hip_atomic_compare_exchange_strong)
+    template<typename THierarchy>
+    struct AlpakaBuiltInAtomic<alpaka::AtomicMin, unsigned long long, THierarchy> : std::false_type
+    {
+    };
+
+    template<>
+    struct AlpakaBuiltInAtomic<alpaka::AtomicMin, unsigned long long, alpaka::hierarchy::Threads> : std::false_type
+    {
+    };
+#            endif
 #        endif
 
     // Max.
@@ -275,6 +287,18 @@ inline namespace alpakaGlobal
     struct AlpakaBuiltInAtomic<alpaka::AtomicMax, double, alpaka::hierarchy::Threads> : std::false_type
     {
     };
+
+#            if !__has_builtin(__hip_atomic_compare_exchange_strong)
+    template<typename THierarchy>
+    struct AlpakaBuiltInAtomic<alpaka::AtomicMax, unsigned long long, THierarchy> : std::false_type
+    {
+    };
+
+    template<>
+    struct AlpakaBuiltInAtomic<alpaka::AtomicMax, unsigned long long, alpaka::hierarchy::Threads> : std::false_type
+    {
+    };
+#            endif
 #        endif