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

[via libc-commits]

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@@ -62,13 +62,22 @@ LIBC_INLINE float tanpif(float x) {
   if (LIBC_UNLIKELY(x_abs == 0U))
     return x;
 
+  // tanpi(x) underflows for 0 < |x| <= 0x1.45f3p-128.
+  if (LIBC_UNLIKELY(x_abs <= 0x0028'be60U))
+    fputil::set_errno_if_required(ERANGE);
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lntue wrote:

Move the check `x_abs == 0U` above inside this branch to reduce the number of branches in the top level.

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