================
@@ -0,0 +1,70 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -triple \
+// RUN: dxil-pc-shadermodel6.6-library %s -emit-llvm -disable-llvm-passes -o
- | \
+// RUN: FileCheck %s --check-prefixes=CHECK,DXCHECK
+
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -triple \
+// RUN: spirv-pc-vulkan-library %s -emit-llvm -disable-llvm-passes -o - | \
+// RUN: FileCheck %s --check-prefixes=CHECK,SPVCHECK
+
+// Test basic lowering of HLSL InterlockedCompareExchange to `cmpxchg
+// monotonic`. The operation reports the value that was in the destination
+// before the operation, so the first element of the `cmpxchg` result goes to
+// the out parameter.
+
+groupshared int gs_i32;
+groupshared uint gs_u32;
+groupshared int64_t gs_i64;
+groupshared uint64_t gs_u64;
+
+// CHECK-LABEL: define {{.*}}void @{{.*}}test_int
+// DXCHECK: [[PAIR:%.*]] = cmpxchg ptr addrspace(3) {{.*}}@gs_i32{{.*}}, i32
%{{.*}}, i32 %{{.*}} syncscope("workgroup") monotonic monotonic
+// SPVCHECK: [[PAIR:%.*]] = cmpxchg ptr addrspace(3) {{.*}}@gs_i32{{.*}}, i32
%{{.*}}, i32 %{{.*}} syncscope("workgroup") monotonic monotonic
----------------
joaosaffran wrote:
```suggestion
// CHECK: [[PAIR:%.*]] = cmpxchg ptr addrspace(3) {{.*}}@gs_i32{{.*}}, i32
%{{.*}}, i32 %{{.*}} syncscope("workgroup") monotonic monotonic
```
https://github.com/llvm/llvm-project/pull/222165
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