Add != operator for enum types (#1394)

This was an oversight in the stdlib, and the `!=` definition follows the `==` in a straightforward fashion.

2 files changed, 44 insertions, 0 deletions

diff --git a/tests/language-feature/enums/enum-equality.slang b/tests/language-feature/enums/enum-equality.slang
new file mode 100644
index 000000000..0ad39c0f4
--- /dev/null
+++ b/tests/language-feature/enums/enum-equality.slang
@@ -0,0 +1,40 @@
+// enum-equality.slang
+
+// Test that equality (and inequality) of `enum`
+// types works as expected.
+
+//TEST(compute):COMPARE_COMPUTE:
+
+enum Channel
+{
+    Red,
+    Green,
+    Blue,
+    Alpha,
+}
+
+int test(int val)
+{
+    Channel channel= Channel(val);
+
+    int result = 0;
+    if(channel == Channel.Red)      result += 1;
+    if(channel != Channel.Green)    result += 16;
+    if(channel == Channel.Blue)     result += 16*16;
+    if(channel != Channel.Alpha)    result += 16*16*16;
+
+    return result;
+}
+
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    int inVal = tid;
+    int outVal = test(inVal);
+    outputBuffer[tid] = outVal;
+}
diff --git a/tests/language-feature/enums/enum-equality.slang.expected.txt b/tests/language-feature/enums/enum-equality.slang.expected.txt
new file mode 100644
index 000000000..e42d67682
--- /dev/null
+++ b/tests/language-feature/enums/enum-equality.slang.expected.txt
@@ -0,0 +1,4 @@
+1011
+1000
+1110
+10