[libc-commits] [libc] [libc][math][c23] Implement canonicalize functions (PR #85940)

[via libc-commits]

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@@ -73,6 +73,17 @@ LIBC_INLINE T fdim(T x, T y) {
   return (x > y ? x - y : 0);
 }
 
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T canonicalize(T *cx, const T *x) {
+  FPBits<T> sx(*x);
+  if (sx.is_signaling_nan()) {
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lntue wrote:

We can optimize it a bit by putting this rare condition under `LIBC_UNLIKELY` (from `src/__support/macros/optimization.h` header)

https://github.com/llvm/llvm-project/pull/85940