llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-tools-extra

Author: Victor Chernyakin (localspook)

<details>
<summary>Changes</summary>

C++23 integer literal suffixes:

| Suffix | Type |
|-|-----------------------------|
|`z`  | `std::make_signed_t&lt;std::size_t&gt;`|
|`uz`  | `std::size_t`|

C++23 floating-point literal suffixes:

| Suffix | Type |
|-|-----------------------------|
|`bf16`   | `std::bfloat16_t`|
|`f16`   | `std::float16_t`|
|`f32`   | `std::float32_t`|
|`f64`   | `std::float64_t`|
|`f128`   | `std::float128_t`|

C23 integer literal suffixes:

| Suffix | Type |
|-|-----------------------------|
|`wb `  | `_BitInt(N)`|
|`uwb `  | `unsigned _BitInt(N)`|

C23 floating-point literal suffixes:

| Suffix | Type |
|-|-----------------------------|
|`df`   | `_Decimal32`|
|`dd`   | `_Decimal64`|
|`dl`   | `_Decimal128`|

Clang doesn't actually support any of the new floating point types yet (except 
for `f16`). I've decided to add disabled tests for them, so that when the 
support comes, we can flip the switch and support them with no delay.

---

Patch is 26.98 KiB, truncated to 20.00 KiB below, full version: 
https://github.com/llvm/llvm-project/pull/148275.diff


6 Files Affected:

- (modified) 
clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp (+7-6) 
- (modified) clang-tools-extra/docs/ReleaseNotes.rst (+4) 
- (added) 
clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-c23.c
 (+162) 
- (added) 
clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-extended-floating-point.cpp
 (+248) 
- (removed) 
clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp
 (-51) 
- (modified) 
clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp
 (+85-1) 


``````````diff
diff --git 
a/clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp 
b/clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
index 678aa8dad48a7..dd43ee200f4c0 100644
--- a/clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
@@ -25,10 +25,11 @@ struct IntegerLiteralCheck {
   static constexpr llvm::StringLiteral Name = llvm::StringLiteral("integer");
   // What should be skipped before looking for the Suffixes? (Nothing here.)
   static constexpr llvm::StringLiteral SkipFirst = llvm::StringLiteral("");
-  // Suffix can only consist of 'u' and 'l' chars, and can be a complex number
-  // ('i', 'j'). In MS compatibility mode, suffixes like i32 are supported.
+  // Suffix can only consist of 'u', 'l', and 'z' chars, can be a bit-precise
+  // integer (wb), and can be a complex number ('i', 'j'). In MS compatibility
+  // mode, suffixes like i32 are supported.
   static constexpr llvm::StringLiteral Suffixes =
-      llvm::StringLiteral("uUlLiIjJ");
+      llvm::StringLiteral("uUlLzZwWbBiIjJ");
 };
 constexpr llvm::StringLiteral IntegerLiteralCheck::Name;
 constexpr llvm::StringLiteral IntegerLiteralCheck::SkipFirst;
@@ -45,10 +46,10 @@ struct FloatingLiteralCheck {
   // Since the exponent ('p'/'P') is mandatory for hexadecimal floating-point
   // literals, we first skip everything before the exponent.
   static constexpr llvm::StringLiteral SkipFirst = llvm::StringLiteral("pP");
-  // Suffix can only consist of 'f', 'l', "f16", 'h', 'q' chars,
-  // and can be a complex number ('i', 'j').
+  // Suffix can only consist of 'f', 'l', "f16", "bf16", "df", "dd", "dl",
+  // 'h', 'q' chars, and can be a complex number ('i', 'j').
   static constexpr llvm::StringLiteral Suffixes =
-      llvm::StringLiteral("fFlLhHqQiIjJ");
+      llvm::StringLiteral("fFlLbBdDhHqQiIjJ");
 };
 constexpr llvm::StringLiteral FloatingLiteralCheck::Name;
 constexpr llvm::StringLiteral FloatingLiteralCheck::SkipFirst;
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst 
b/clang-tools-extra/docs/ReleaseNotes.rst
index ad869265a2db5..119c030b43852 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -354,6 +354,10 @@ Changes in existing checks
   <clang-tidy/checks/readability/redundant-smartptr-get>` check by fixing
   some false positives involving smart pointers to arrays.
 
+- Improved :doc:`readability-uppercase-literal-suffix
+  <clang-tidy/checks/readability/uppercase-literal-suffix>` check to recognize
+  literal suffixes added in C++23 and C23.
+
 Removed checks
 ^^^^^^^^^^^^^^
 
diff --git 
a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-c23.c
 
b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-c23.c
new file mode 100644
index 0000000000000..75727fc69e68c
--- /dev/null
+++ 
b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-c23.c
@@ -0,0 +1,162 @@
+// TODO: When Clang adds support for decimal floating point types, enable 
these tests by:
+//    1. Removing all the #if 0 + #endif guards.
+//    2. Removing all occurrences of the string "DISABLED-" in this file.
+//    3. Deleting this message.
+
+// RUN: %check_clang_tidy %s readability-uppercase-literal-suffix %t -- -- 
-std=c23
+// RUN: grep -Ev "// *[A-Z-]+:" %s > %t.c
+// RUN: clang-tidy %t.c -checks='-*,readability-uppercase-literal-suffix' -fix 
-- -std=c23
+// RUN: clang-tidy %t.c -checks='-*,readability-uppercase-literal-suffix' 
-warnings-as-errors='-*,readability-uppercase-literal-suffix' -- -std=c23
+
+void bit_precise_literal_suffix() {
+  // _BitInt()
+
+  static constexpr auto v1 = 1wb;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'wb', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v1 = 1wb;
+  // CHECK-MESSAGES-NEXT: ^~~
+  // CHECK-MESSAGES-NEXT: WB{{$}}
+  // CHECK-FIXES: static constexpr auto v1 = 1WB;
+  static_assert(v1 == 1WB);
+
+  static constexpr auto v2 = 1WB; // OK.
+  static_assert(v2 == 1WB);
+
+  // _BitInt() Unsigned
+
+  static constexpr auto v3 = 1wbu;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'wbu', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 1wbu;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: WBU{{$}}
+  // CHECK-FIXES: static constexpr auto v3 = 1WBU;
+  static_assert(v3 == 1WBU);
+
+  static constexpr auto v4 = 1WBu;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'WBu', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v4 = 1WBu;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: WBU{{$}}
+  // CHECK-FIXES: static constexpr auto v4 = 1WBU;
+  static_assert(v4 == 1WBU);
+
+  static constexpr auto v5 = 1wbU;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'wbU', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1wbU;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: WBU{{$}}
+  // CHECK-FIXES: static constexpr auto v5 = 1WBU;
+  static_assert(v5 == 1WBU);
+
+  static constexpr auto v6 = 1WBU; // OK.
+  static_assert(v6 == 1WBU);
+
+  // Unsigned _BitInt()
+
+  static constexpr auto v7 = 1uwb;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'uwb', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1uwb;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: UWB{{$}}
+  // CHECK-FIXES: static constexpr auto v7 = 1UWB;
+  static_assert(v7 == 1UWB);
+
+  static constexpr auto v8 = 1uWB;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'uWB', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v8 = 1uWB;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: UWB{{$}}
+  // CHECK-FIXES: static constexpr auto v8 = 1UWB;
+  static_assert(v8 == 1UWB);
+
+  static constexpr auto v9 = 1Uwb;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 
'Uwb', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1Uwb;
+  // CHECK-MESSAGES-NEXT: ^~~~
+  // CHECK-MESSAGES-NEXT: UWB{{$}}
+  // CHECK-FIXES: static constexpr auto v9 = 1UWB;
+  static_assert(v9 == 1UWB);
+
+  static constexpr auto v10 = 1UWB; // OK.
+  static_assert(v10 == 1UWB);
+}
+
+void decimal_floating_point_suffix() {
+  // _Decimal32
+
+#if 0
+  static constexpr auto v1 = 1.df;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'df', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v1 = 1.df;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DF{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v1 = 1.DF;
+  static_assert(v1 == 1.DF);
+
+  static constexpr auto v2 = 1.e0df;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'df', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v2 = 1.e0df;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DF{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v2 = 1.e0DF;
+  static_assert(v2 == 1.DF);
+
+  static constexpr auto v3 = 1.DF; // OK.
+  static_assert(v3 == 1.DF);
+
+  static constexpr auto v4 = 1.e0DF; // OK.
+  static_assert(v4 == 1.DF);
+#endif
+
+  // _Decimal64
+
+#if 0
+  static constexpr auto v5 = 1.dd;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'dd', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1.dd;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DD{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v5 = 1.DD;
+  static_assert(v5 == 1.DD);
+
+  static constexpr auto v6 = 1.e0dd;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'dd', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v6 = 1.e0dd;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DD{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v6 = 1.e0DD;
+  static_assert(v6 == 1.DD);
+
+  static constexpr auto v7 = 1.DD; // OK.
+  static_assert(v7 == 1.DD);
+
+  static constexpr auto v8 = 1.e0DD; // OK.
+  static_assert(v8 == 1.DD);
+#endif
+
+  // _Decimal128
+
+#if 0
+  static constexpr auto v9 = 1.dl;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'dl', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1.dl;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DL{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v9 = 1.DL;
+  static_assert(v9 == 1.DL);
+
+  static constexpr auto v10 = 1.e0dl;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'dl', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v10 = 1.e0dl;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: DL{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v10 = 1.e0DL;
+  static_assert(v10 == 1.DL);
+
+  static constexpr auto v11 = 1.DL; // OK.
+  static_assert(v11 == 1.DL);
+
+  static constexpr auto v12 = 1.e0DL; // OK.
+  static_assert(v12 == 1.DL);
+#endif
+}
diff --git 
a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-extended-floating-point.cpp
 
b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-extended-floating-point.cpp
new file mode 100644
index 0000000000000..abe23e3363766
--- /dev/null
+++ 
b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-extended-floating-point.cpp
@@ -0,0 +1,248 @@
+// TODO: When Clang adds support for C++23 floating-point types, enable these 
tests by:
+//    1. Removing all the #if 0 + #endif guards.
+//    2. Removing all occurrences of the string "DISABLED-" in this file.
+//    3. Deleting this message.
+// These suffixes may be relevant to C too: 
https://github.com/llvm/llvm-project/issues/97335
+
+// RUN: %check_clang_tidy -std=c++23 %s readability-uppercase-literal-suffix 
%t -- -- -target aarch64-linux-gnu -I %clang_tidy_headers
+
+#include "integral_constant.h"
+#if 0
+#include <stdfloat>
+#endif
+
+void normal_literals() {
+  // std::bfloat16_t
+
+#if 0
+  static constexpr auto v1 = 1.bf16;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'bf16', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v1 = 1.bf16;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: BF16{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v1 = 1.BF16;
+  static_assert(is_same<decltype(v1), const std::bfloat16_t>::value, "");
+  static_assert(v1 == 1.BF16, "");
+
+  static constexpr auto v2 = 1.e0bf16;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'bf16', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v2 = 1.e0bf16;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: BF16{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v2 = 1.e0BF16;
+  static_assert(is_same<decltype(v2), const std::bfloat16_t>::value, "");
+  static_assert(v2 == 1.BF16, "");
+
+  static constexpr auto v3 = 1.BF16; // OK.
+  static_assert(is_same<decltype(v3), const std::bfloat16_t>::value, "");
+  static_assert(v3 == 1.BF16, "");
+
+  static constexpr auto v4 = 1.e0BF16; // OK.
+  static_assert(is_same<decltype(v4), const std::bfloat16_t>::value, "");
+  static_assert(v4 == 1.BF16, "");
+#endif
+
+  // _Float16/std::float16_t
+
+  static constexpr auto v5 = 1.f16;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has 
suffix 'f16', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1.f16;
+  // CHECK-MESSAGES-NEXT: ^ ~
+  // CHECK-MESSAGES-NEXT: F16{{$}}
+  // CHECK-FIXES: static constexpr auto v5 = 1.F16;
+  static_assert(is_same<decltype(v5), const _Float16>::value, "");
+  static_assert(v5 == 1.F16, "");
+
+  static constexpr auto v6 = 1.e0f16;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has 
suffix 'f16', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v6 = 1.e0f16;
+  // CHECK-MESSAGES-NEXT: ^ ~
+  // CHECK-MESSAGES-NEXT: F16{{$}}
+  // CHECK-FIXES: static constexpr auto v6 = 1.e0F16;
+  static_assert(is_same<decltype(v6), const _Float16>::value, "");
+  static_assert(v6 == 1.F16, "");
+
+  static constexpr auto v7 = 1.F16; // OK.
+  static_assert(is_same<decltype(v7), const _Float16>::value, "");
+  static_assert(v7 == 1.F16, "");
+
+  static constexpr auto v8 = 1.e0F16; // OK.
+  static_assert(is_same<decltype(v8), const _Float16>::value, "");
+  static_assert(v8 == 1.F16, "");
+
+  // std::float32_t
+
+#if 0
+  static constexpr auto v9 = 1.f32;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'f32', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1.f32;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F32{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v9 = 1.F32;
+  static_assert(is_same<decltype(v9), const std::float32_t>::value, "");
+  static_assert(v9 == 1.F32, "");
+
+  static constexpr auto v10 = 1.e0f32;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'f32', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v10 = 1.e0f32;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F32{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v10 = 1.e0F32;
+  static_assert(is_same<decltype(v10), const std::float32_t>::value, "");
+  static_assert(v10 == 1.F32, "");
+
+  static constexpr auto v11 = 1.F32; // OK.
+  static_assert(is_same<decltype(v11), const std::float32_t>::value, "");
+  static_assert(v11 == 1.F32, "");
+
+  static constexpr auto v12 = 1.e0F32; // OK.
+  static_assert(is_same<decltype(v12), const std::float32_t>::value, "");
+  static_assert(v12 == 1.F32, "");
+#endif
+
+  // std::float64_t
+
+#if 0
+  static constexpr auto v13 = 1.f64;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'f64', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v13 = 1.f64;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F64{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v13 = 1.F64;
+  static_assert(is_same<decltype(v13), const std::float64_t>::value, "");
+  static_assert(v13 == 1.F64, "");
+
+  static constexpr auto v14 = 1.e0f64;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'f64', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v14 = 1.e0f64;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F64{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v14 = 1.e0F64;
+  static_assert(is_same<decltype(v14), const std::float64_t>::value, "");
+  static_assert(v14 == 1.F64, "");
+
+  static constexpr auto v15 = 1.F64; // OK.
+  static_assert(is_same<decltype(v15), const std::float64_t>::value, "");
+  static_assert(v15 == 1.F64, "");
+
+  static constexpr auto v16 = 1.e0F64; // OK.
+  static_assert(is_same<decltype(v16), const std::float64_t>::value, "");
+  static_assert(v16 == 1.F64, "");
+#endif
+
+  // std::float128_t
+
+#if 0
+  static constexpr auto v17 = 1.f128;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'f128', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v17 = 1.f128;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F128{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v17 = 1.F128;
+  static_assert(is_same<decltype(v17), const std::float128_t>::value, "");
+  static_assert(v17 == 1.F128, "");
+
+  static constexpr auto v18 = 1.e0f128;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal 
has suffix 'f128', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v18 = 1.e0f128;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^ ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F128{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v18 = 1.e0F128;
+  static_assert(is_same<decltype(v18), const std::float128_t>::value, "");
+  static_assert(v18 == 1.F128, "");
+
+  static constexpr auto v19 = 1.F128; // OK.
+  static_assert(is_same<decltype(v19), const std::float128_t>::value, "");
+  static_assert(v19 == 1.F128, "");
+
+  static constexpr auto v20 = 1.e0F128; // OK.
+  static_assert(is_same<decltype(v20), const std::float128_t>::value, "");
+  static_assert(v20 == 1.F128, "");
+#endif
+}
+
+void hexadecimal_literals() {
+  // std::bfloat16_t
+
+#if 0
+  static constexpr auto v1 = 0xfp0bf16;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'bf16', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v1 = 0xfp0bf16;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^    ~
+  // DISABLED-CHECK-MESSAGES-NEXT: BF16{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v1 = 0xfp0BF16;
+  static_assert(is_same<decltype(v1), const std::bfloat16_t>::value, "");
+  static_assert(v1 == 0xfp0BF16, "");
+
+  static constexpr auto v2 = 0xfp0BF16; // OK.
+  static_assert(is_same<decltype(v2), const std::bfloat16_t>::value, "");
+  static_assert(v2 == 0xfp0BF16, "");
+#endif
+
+  // _Float16/std::float16_t
+
+  static constexpr auto v3 = 0xfp0f16;
+  // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has 
suffix 'f16', which is not uppercase
+  // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 0xfp0f16;
+  // CHECK-MESSAGES-NEXT: ^    ~
+  // CHECK-MESSAGES-NEXT: F16{{$}}
+  // CHECK-FIXES: static constexpr auto v3 = 0xfp0F16;
+  static_assert(is_same<decltype(v3), const _Float16>::value, "");
+  static_assert(v3 == 0xfp0F16, "");
+
+  static constexpr auto v4 = 0xfp0F16; // OK.
+  static_assert(is_same<decltype(v4), const _Float16>::value, "");
+  static_assert(v4 == 0xfp0F16, "");
+
+  // std::float32_t
+
+#if 0
+  static constexpr auto v5 = 0xfp0f32;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'f32', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v5 = 0xfp0f32;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^    ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F32{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v5 = 0xfp0F32;
+  static_assert(is_same<decltype(v5), const std::float32_t>::value, "");
+  static_assert(v5 == 0xfp0F32, "");
+
+  static constexpr auto v6 = 0xfp0F32; // OK.
+  static_assert(is_same<decltype(v6), const std::float32_t>::value, "");
+  static_assert(v6 == 0xfp0F32, "");
+#endif
+
+  // std::float64_t
+
+#if 0
+  static constexpr auto v7 = 0xfp0f64;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'f64', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v7 = 0xfp0f64;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^    ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F64{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v7 = 0xfp0F64;
+  static_assert(is_same<decltype(v7), const std::float64_t>::value, "");
+  static_assert(v7 == 0xfp0F64, "");
+
+  static constexpr auto v8 = 0xfp0F64; // OK.
+  static_assert(is_same<decltype(v8), const std::float64_t>::value, "");
+  static_assert(v8 == 0xfp0F64, "");
+#endif
+
+  // std::float128_t
+
+#if 0
+  static constexpr auto v9 = 0xfp0f128;
+  // DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal 
has suffix 'f128', which is not uppercase
+  // DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v9 = 0xfp0f128;
+  // DISABLED-CHECK-MESSAGES-NEXT: ^    ~
+  // DISABLED-CHECK-MESSAGES-NEXT: F128{{$}}
+  // DISABLED-CHECK-FIXES: static constexpr auto v9 = 0xfp0F128;
+  static_assert(is_same<decltype(v9), const std::float128_t>::value, "");
+  static_assert(v9 == 0xfp0F128, "");
+
+  static constexpr auto v10 ...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/148275
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