[llvm-branch-commits] [libc] [libc][math][c++23] Add scalb{, l}nbf16 math functions (PR #155569)

[via llvm-branch-commits]

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+//===-- Implementation of scalblnbf16 function ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/math/scalblnbf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, scalblnbf16, (bfloat16 x, long n)) {
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overmighty wrote:

Missing this check that existing `scalbln` function implementations have:

```cpp
#if FLT_RADIX != 2
#error "FLT_RADIX != 2 is not supported."
#endif
```

https://github.com/llvm/llvm-project/pull/155569