[CIR] Add support the ChooseExpr for scalar (#171882)

Add support the ChooseExpr for scalar expr

Author: AmrDeveloper

clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp

@@ -1352,8 +1352,7 @@ class ScalarExprEmitter : public StmtVisitor<ScalarExprEmitter, mlir::Value> {
   }
 
   mlir::Value VisitChooseExpr(ChooseExpr *e) {
-    cgf.cgm.errorNYI(e->getSourceRange(), "ScalarExprEmitter: choose");
-    return {};
+    return Visit(e->getChosenSubExpr());
   }
 
   mlir::Value VisitObjCStringLiteral(const ObjCStringLiteral *e) {

clang/test/CIR/CodeGen/choose-expr.cpp

@@ -0,0 +1,44 @@
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s -check-prefix=CIR
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --input-file=%t-cir.ll %s -check-prefix=LLVM
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=OGCG
+
+void choose_expr() {
+  int a = __builtin_choose_expr(1, 2, 3);
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["a", init]
+// CIR: %[[CONST_2:.*]] = cir.const #cir.int<2> : !s32i
+// CIR: cir.store {{.*}} %[[CONST_2]], %[[A_ADDR]] : !s32i, !cir.ptr<!s32i>
+
+// LLVM: %[[A_ADDR:.*]] = alloca i32, i64 1, align 4
+// LLVM: store i32 2, ptr %[[A_ADDR]], align 4
+
+// OGCG: %[[A_ADDR:.*]] = alloca i32, align 4
+// OGCG: store i32 2, ptr %[[A_ADDR]], align 4
+
+void choose_expr_non_constant() {
+  int a;
+  int b;
+  int c = __builtin_choose_expr(1, a, b);
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["a"]
+// CIR: %[[B_ADDR:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["b"]
+// CIR: %[[C_ADDR:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["c", init]
+// CIR: %[[TMP_A:.*]] = cir.load {{.*}} %[[A_ADDR]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.store {{.*}} %[[TMP_A]], %[[C_ADDR]] : !s32i, !cir.ptr<!s32i>
+
+// LLVM: %[[A_ADDR:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[B_ADDR:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[C_ADDR:.*]] = alloca i32, i64 1, align 4
+// LLVM: %[[TMP_A:.*]] = load i32, ptr %[[A_ADDR]], align 4
+// LLVM: store i32 %[[TMP_A]], ptr %[[C_ADDR]], align 4
+
+// OGCG: %[[A_ADDR:.*]] = alloca i32, align 4
+// OGCG: %[[B_ADDR:.*]] = alloca i32, align 4
+// OGCG: %[[C_ADDR:.*]] = alloca i32, align 4
+// OGCG: %[[TMP_A:.*]] = load i32, ptr %[[A_ADDR]], align 4
+// OGCG: store i32 %[[TMP_A]], ptr %[[C_ADDR]], align 4