Allow implicitly casting enum types to bool. (#4739)

* Allow implicitly casting enum types to bool.

* Fix.

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/language-feature/enums/implicit-cast-to-bool.slang b/tests/language-feature/enums/implicit-cast-to-bool.slang
new file mode 100644
index 000000000..566a5e305
--- /dev/null
+++ b/tests/language-feature/enums/implicit-cast-to-bool.slang
@@ -0,0 +1,43 @@
+// Test enums can be implicitly casted to bool. 
+
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -shaderobj
+
+[Flags]
+enum BitFlags
+{
+    One,
+    Two,
+    Three
+}
+
+int test<let n : bool>()
+{
+    return n;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
+{
+    BitFlags x = BitFlags.One | BitFlags.Two;
+    if (x & BitFlags.One)
+        outputBuffer[0] = 1;
+    else
+        outputBuffer[0] = 0;
+    if (x & BitFlags.Three)
+        outputBuffer[1] = 1;
+    else
+        outputBuffer[1] = 0;
+    if (x & BitFlags.Two)
+        outputBuffer[2] = 1;
+    else
+        outputBuffer[2] = 0;
+
+    outputBuffer[3] = test<BitFlags.One & BitFlags.One>();
+    // CHECK: 1
+    // CHECK: 0
+    // CHECK: 1
+    // CHECK: 1
+}