[clang] [clang] Add zero-initialization for fixed point types (PR #80781)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (PiJoules)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/80781.diff


2 Files Affected:

- (modified) clang/lib/AST/ExprConstant.cpp (+4) 
- (added) clang/test/CodeGenCXX/fixed-point-zero-init.cpp (+9) 


``````````diff
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 63453890d9879..089bc2094567f 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -11427,6 +11427,10 @@ class FixedPointExprEvaluator
     return true;
   }
 
+  bool ZeroInitialization(const Expr *E) {
+    return Success(0, E);
+  }
+
   //===--------------------------------------------------------------------===//
   //                            Visitor Methods
   //===--------------------------------------------------------------------===//
diff --git a/clang/test/CodeGenCXX/fixed-point-zero-init.cpp b/clang/test/CodeGenCXX/fixed-point-zero-init.cpp
new file mode 100644
index 0000000000000..9a7a6600fe556
--- /dev/null
+++ b/clang/test/CodeGenCXX/fixed-point-zero-init.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -ffixed-point -S -emit-llvm %s -o - | FileCheck %s
+
+// CHECK: @_ZL1a = internal constant [2 x i32] zeroinitializer
+constexpr _Accum a[2] = {};
+
+void func2(const _Accum *);
+void func() {
+  func2(a);
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/80781