[clang] [CIR] Refactor global variable emission and initialization (PR #138222)

[Morris Hafner via cfe-commits]

================
@@ -90,8 +90,100 @@ class ConstExprEmitter
   }
 
   mlir::Attribute VisitCastExpr(CastExpr *e, QualType destType) {
-    cgm.errorNYI(e->getBeginLoc(), "ConstExprEmitter::VisitCastExpr");
-    return {};
+    if (const auto *ece = dyn_cast<ExplicitCastExpr>(e))
+      cgm.errorNYI(e->getBeginLoc(),
+                   "ConstExprEmitter::VisitCastExpr explicit cast");
+    Expr *subExpr = e->getSubExpr();
+
+    switch (e->getCastKind()) {
+    case CK_HLSLArrayRValue:
----------------
mmha wrote:

OGCG returns `nullptr` for the HLSL casts. The incubator has them as NYI.

https://github.com/llvm/llvm-project/pull/138222
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