[llvm-branch-commits] [libc] [libc][math][c++23] Add {get, set}payloadbf16 and setpayloadsigbf16 math functions (PR #153994)

[via llvm-branch-commits]

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@@ -354,7 +354,10 @@ LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> getpayload(T x) {
 
     return static_cast<T>(payload_dfloat);
   } else {
-    return static_cast<T>(payload);
+    if constexpr (cpp::is_same_v<T, bfloat16>)
+      return T(static_cast<int>(payload));
+    else
+      return static_cast<T>(payload);
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overmighty wrote:

Why do we have the `BFloat16(uint16_t bits)` constructor again? Removing it makes this change unnecessary and `libc-math-smoke-tests` and `libc.test.src.__support.FPUtil.bfloat16_test.__unit__` still pass.

https://github.com/llvm/llvm-project/pull/153994