[clang] [llvm] [HLSL] Handle WaveActiveBallot struct return type appropriately (PR #175105)

[Farzon Lotfi via cfe-commits]

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@@ -160,6 +160,26 @@ static Value *handleHlslSplitdouble(const CallExpr *E, CodeGenFunction *CGF) {
   return LastInst;
 }
 
+static Value *handleHlslWaveActiveBallot(const CallExpr *E,
+                                         CodeGenFunction *CGF) {
+  Value *Cond = CGF->EmitScalarExpr(E->getArg(0));
+  llvm::Type *I32 = CGF->Int32Ty;
+
+  if (CGF->CGM.getTarget().getTriple().isDXIL()) {
+    return CGF->EmitRuntimeCall(
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farzonl wrote:

this doesn't seem quite right. the DirectX case should be returning an unamed struct? don't we need to format this into a  vector of size 4?

https://github.com/llvm/llvm-project/pull/175105