[libc-commits] [libc] [libc] Add sinpif16 function (PR #110994)

[via libc-commits]

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@@ -488,14 +488,28 @@ class MPFRNumber {
     (MPFR_VERSION_MAJOR == 4 && MPFR_VERSION_MINOR >= 2)
 
     mpfr_sinpi(result.value, value, mpfr_rounding);
+    return result;
 #else
+    if (mpfr_integer_p(value)) {
+      mpfr_set_si(result.value, 0, mpfr_rounding);
+      return result;
+    }
+
+    MPFRNumber value_mul_two(*this);
+    mpfr_mul_si(value_mul_two.value, value, 2, MPFR_RNDN);
+
+    if (mpfr_integer_p(value_mul_two.value) != 0) {
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overmighty wrote:

Nit: `mpfr_integer_p` returns a boolean pretty much.

```suggestion
    if (mpfr_integer_p(value_mul_two.value)) {
```

https://github.com/llvm/llvm-project/pull/110994