[clang] [CIR] Implement CXXScalarValueInitExpr for ComplexType (PR #147143)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Amr Hesham (AmrDeveloper)

<details>
<summary>Changes</summary>

Implement CXXScalarValueInitExpr support for ComplexType

https://github.com/llvm/llvm-project/issues/141365

---
Full diff: https://github.com/llvm/llvm-project/pull/147143.diff


2 Files Affected:

- (modified) clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp (+12) 
- (modified) clang/test/CIR/CodeGen/complex.cpp (+18) 


``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
index c000b225f31f3..48024b457f848 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
@@ -44,6 +44,7 @@ class ComplexExprEmitter : public StmtVisitor<ComplexExprEmitter, mlir::Value> {
   mlir::Value VisitBinComma(const BinaryOperator *e);
   mlir::Value VisitCallExpr(const CallExpr *e);
   mlir::Value VisitChooseExpr(ChooseExpr *e);
+  mlir::Value VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *e);
   mlir::Value VisitDeclRefExpr(DeclRefExpr *e);
   mlir::Value VisitGenericSelectionExpr(GenericSelectionExpr *e);
   mlir::Value VisitImplicitCastExpr(ImplicitCastExpr *e);
@@ -161,6 +162,17 @@ mlir::Value ComplexExprEmitter::VisitChooseExpr(ChooseExpr *e) {
   return Visit(e->getChosenSubExpr());
 }
 
+mlir::Value
+ComplexExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *e) {
+  mlir::Location loc = cgf.getLoc(e->getExprLoc());
+  QualType complexElemTy =
+      e->getType()->castAs<clang::ComplexType>()->getElementType();
+  mlir::Type complexElemLLVMTy = cgf.convertType(complexElemTy);
+  mlir::TypedAttr defaultValue = builder.getZeroInitAttr(complexElemLLVMTy);
+  auto complexAttr = cir::ConstComplexAttr::get(defaultValue, defaultValue);
+  return builder.create<cir::ConstantOp>(loc, complexAttr);
+}
+
 mlir::Value ComplexExprEmitter::VisitDeclRefExpr(DeclRefExpr *e) {
   if (CIRGenFunction::ConstantEmission constant = cgf.tryEmitAsConstant(e))
     return emitConstant(constant, e);
diff --git a/clang/test/CIR/CodeGen/complex.cpp b/clang/test/CIR/CodeGen/complex.cpp
index 09e0ca03aa540..567fc40df6236 100644
--- a/clang/test/CIR/CodeGen/complex.cpp
+++ b/clang/test/CIR/CodeGen/complex.cpp
@@ -654,3 +654,21 @@ void foo26(int _Complex* a) {
 // OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[COMPLEX_B]], i32 0, i32 1
 // OGCG: store i32 %[[A_REAL]], ptr %[[B_REAL_PTR]], align 4
 // OGCG: store i32 %[[A_IMAG]], ptr %[[B_IMAG_PTR]], align 4
+
+void foo28() {
+  using IntComplex = int _Complex;
+  int _Complex a = IntComplex();
+}
+
+// CIR: %[[INIT:.*]] = cir.alloca !cir.complex<!s32i>, !cir.ptr<!cir.complex<!s32i>>, ["a", init]
+// CIR: %[[COMPLEX:.*]] = cir.const #cir.const_complex<#cir.int<0> : !s32i, #cir.int<0> : !s32i> : !cir.complex<!s32i>
+// CIR: cir.store align(4) %[[COMPLEX]], %[[INIT]] : !cir.complex<!s32i>, !cir.ptr<!cir.complex<!s32i>>
+
+// LLVM: %[[INIT:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: store { i32, i32 } zeroinitializer, ptr %[[INIT]], align 4
+
+// OGCG: %[[INIT:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[INIT_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[INIT]], i32 0, i32 0
+// OGCG: %[[INIT_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[INIT]], i32 0, i32 1
+// OGCG: store i32 0, ptr %[[INIT_REAL_PTR]], align 4
+// OGCG: store i32 0, ptr %[[INIT_IMAG_PTR]], align 4

``````````

</details>


https://github.com/llvm/llvm-project/pull/147143