[libc-commits] [libc] [libc][math] Fix `tanpif` and `tanpif16` error handling (PR #235296)

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@@ -53,13 +53,24 @@ LIBC_INLINE float16 tanpif16(float16 x) {
   if (LIBC_UNLIKELY(x_abs == 0U))
     return x;
 
+  // tanpi(x) underflows for 0 < |x| <= 0x1.45p-16.
+  if (LIBC_UNLIKELY(x_abs <= 0x0145U)) {
+    fputil::set_errno_if_required(ERANGE);
+    fputil::raise_except_if_required(FE_UNDERFLOW | FE_INEXACT);
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c8ef wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/235296