1 files changed, 44 insertions, 0 deletions
diff --git a/tests/hlsl-intrinsic/countbits64.slang b/tests/hlsl-intrinsic/countbits64.slang
new file mode 100644
index 000000000..a24b31477
--- /dev/null
+++ b/tests/hlsl-intrinsic/countbits64.slang
@@ -0,0 +1,44 @@
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHK):-slang -compute -cpu
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHK):-slang -vk -compute -render-feature int64
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHK):-slang -cuda -compute
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHK):-slang -mtl -compute
+// No support for uint64_t on fxc - we need SM6.0 and dxil to use uint64_t with d3d12
+// https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/hlsl-shader-model-6-0-features-for-direct3d-12
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHK):-slang -compute -dx12 -profile cs_6_0 -use-dxil -shaderobj -render-feature hardware-device
+
+//CHK:1
+
+//TEST_INPUT:ubuffer(data=[0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<uint> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint r1 = countbits(0b1ULL << 32);
+    uint2 r2 = countbits(uint64_t2(0b0ULL << 32, 0b1ULL << 32));
+    uint3 r3 = countbits(uint64_t3(0b0ULL << 32, 0b1ULL << 32, 0b11ULL << 32));
+    uint4 r4 = countbits(uint64_t4(0b0ULL << 32, 0b1ULL << 32, 0b11ULL << 32, 0b111ULL << 32));
+
+    uint r5 = countbits(0b1LL << 32);
+    uint2 r6 = countbits(int64_t2(0b0LL << 32, 0b1LL << 32));
+    uint3 r7 = countbits(int64_t3(0b0LL << 32, 0b1LL << 32, 0b11LL << 32));
+    uint4 r8 = countbits(int64_t4(0b0LL << 32, 0b1LL << 32, 0b11LL << 32, 0b111LL << 32));
+
+    uint bigShiftU32 = 0b111U << 32;
+    int bigShiftI32 = 0b1111 << 32;
+
+    uint bitCountBigShiftU32 = countbits(bigShiftU32);
+    uint bitCountBigShiftI32 = countbits(bigShiftI32);
+
+    outputBuffer[0] = true
+        && (r1 == 1)
+        && (r2.x == 0 && r2.y == 1)
+        && (r3.x == 0 && r3.y == 1 && r3.z == 2)
+        && (r4.x == 0 && r4.y == 1 && r4.z == 2 && r4.w == 3)
+        && (r5 == 1)
+        && (r6.x == 0 && r6.y == 1)
+        && (r7.x == 0 && r7.y == 1 && r7.z == 2)
+        && (r8.x == 0 && r8.y == 1 && r8.z == 2 && r8.w == 3)
+        && (bitCountBigShiftU32 == 0 && bitCountBigShiftI32 == 0)
+        ;
+}