[clang] [Clang] Add additional tests for constexpr initialization (PR #181965)

[Samrudh Nelli via cfe-commits]

https://github.com/SamrudhNelli created https://github.com/llvm/llvm-project/pull/181965

Add initialization tests for `0.0f`, `0e0`, `0x0p0`.
Suggested by @shafik in #180376 

>From 9e8bcf6b421e0f285be990f0e667bf579949e618 Mon Sep 17 00:00:00 2001
From: Samrudh Nelli <samrudhnelli at gmail.com>
Date: Wed, 18 Feb 2026 11:42:51 +0530
Subject: [PATCH] [Clang] Add additional tests for constexpr initialization

---
 clang/test/AST/ByteCode/constexpr.c | 6 ++++++
 clang/test/Sema/constexpr.c         | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/clang/test/AST/ByteCode/constexpr.c b/clang/test/AST/ByteCode/constexpr.c
index dfe3d667f27cc..b345d5e67aa43 100644
--- a/clang/test/AST/ByteCode/constexpr.c
+++ b/clang/test/AST/ByteCode/constexpr.c
@@ -313,6 +313,12 @@ constexpr int *V84 = 42;
 constexpr int *V85 = nullptr;
 constexpr int *V91 = 0.;
 // both-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
+constexpr int *V92 = 0.0f;
+// both-error at -1 {{initializing 'int *const' with an expression of incompatible type 'float'}}
+constexpr int *V93 = 0e0;
+// both-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
+constexpr int *V94 = 0x0p0;
+// both-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
 
 // Check that constexpr variables should not be VLAs.
 void f6(const int P1) {
diff --git a/clang/test/Sema/constexpr.c b/clang/test/Sema/constexpr.c
index 04da0f56a741d..3a6b49fd90748 100644
--- a/clang/test/Sema/constexpr.c
+++ b/clang/test/Sema/constexpr.c
@@ -313,6 +313,12 @@ constexpr int *V84 = 42;
 constexpr int *V85 = nullptr;
 constexpr int *V91 = 0.0; 
 // expected-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
+constexpr int *V92 = 0.0f;
+// expected-error at -1 {{initializing 'int *const' with an expression of incompatible type 'float'}}
+constexpr int *V93 = 0e0;
+// expected-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
+constexpr int *V94 = 0x0p0;
+// expected-error at -1 {{initializing 'int *const' with an expression of incompatible type 'double'}}
 
 // Check that constexpr variables should not be VLAs.
 void f6(const int P1) {