[clang] [CIR] Upstream initial support for switch statements (PR #137106)

[via cfe-commits]

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@@ -422,6 +428,121 @@ mlir::LogicalResult CIRGenFunction::emitBreakStmt(const clang::BreakStmt &s) {
   return mlir::success();
 }
 
+template <typename T>
+mlir::LogicalResult
+CIRGenFunction::emitCaseDefaultCascade(const T *stmt, mlir::Type condType,
+                                       mlir::ArrayAttr value, CaseOpKind kind,
+                                       bool buildingTopLevelCase) {
+
+  assert((isa<CaseStmt, DefaultStmt>(stmt)) &&
+         "only case or default stmt go here");
+
+  mlir::LogicalResult result = mlir::success();
+
+  mlir::Location loc = getLoc(stmt->getBeginLoc());
+
+  enum class SubStmtKind { Case, Default, Other };
+  SubStmtKind subStmtKind = SubStmtKind::Other;
+  const Stmt *sub = stmt->getSubStmt();
+
+  mlir::OpBuilder::InsertPoint insertPoint;
+  builder.create<CaseOp>(loc, value, kind, insertPoint);
+
+  {
+    mlir::OpBuilder::InsertionGuard guardSwitch(builder);
+    builder.restoreInsertionPoint(insertPoint);
+
+    if (isa<DefaultStmt>(sub) && isa<CaseStmt>(stmt)) {
+      subStmtKind = SubStmtKind::Default;
+      builder.createYield(loc);
+    } else if (isa<CaseStmt>(sub) && isa<DefaultStmt>(stmt)) {
+      subStmtKind = SubStmtKind::Case;
+      builder.createYield(loc);
+    } else
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Andres-Salamanca wrote:

Done

https://github.com/llvm/llvm-project/pull/137106