[clang] [clang][Interp] Support __real/__imag on primitives (PR #75485)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/75485.diff


2 Files Affected:

- (modified) clang/lib/AST/Interp/ByteCodeExprGen.cpp (+7) 
- (modified) clang/test/AST/Interp/complex.cpp (+6) 


``````````diff
diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
index d0980882f402b..a4ff21c16b5a3 100644
--- a/clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -2761,6 +2761,8 @@ bool ByteCodeExprGen<Emitter>::VisitUnaryOperator(const UnaryOperator *E) {
       return false;
     return DiscardResult ? this->emitPop(*T, E) : this->emitComp(*T, E);
   case UO_Real: { // __real x
+    if (T)
+      return this->delegate(SubExpr);
     assert(!T);
     if (!this->visit(SubExpr))
       return false;
@@ -2776,6 +2778,11 @@ bool ByteCodeExprGen<Emitter>::VisitUnaryOperator(const UnaryOperator *E) {
     return true;
   }
   case UO_Imag: { // __imag x
+    if (T) {
+      if (!this->discard(SubExpr))
+        return false;
+      return this->visitZeroInitializer(*T, SubExpr->getType(), SubExpr);
+    }
     assert(!T);
     if (!this->visit(SubExpr))
       return false;
diff --git a/clang/test/AST/Interp/complex.cpp b/clang/test/AST/Interp/complex.cpp
index 66490e973988b..1e97cc6184952 100644
--- a/clang/test/AST/Interp/complex.cpp
+++ b/clang/test/AST/Interp/complex.cpp
@@ -37,6 +37,12 @@ constexpr _Complex int I2 = {};
 static_assert(__real(I2) == 0, "");
 static_assert(__imag(I2) == 0, "");
 
+static_assert(__real(4.0) == 4.0, "");
+static_assert(__real(12u) == 12u, "");
+static_assert(__imag(4.0) == 0.0, "");
+static_assert(__imag(13) == 0, "");
+
+
 
 /// Standalone complex expressions.
 static_assert(__real((_Complex float){1.0, 3.0}) == 1.0, "");

``````````

</details>


https://github.com/llvm/llvm-project/pull/75485