[libc] Add maybe_unused for functions only used on slow path

[jhuber6]

Summary:
When the fast math options are enabled these functions are uncalled,
which makes it error.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Joseph Huber (jhuber6)

Changes

Summary:
When the fast math options are enabled these functions are uncalled,
which makes it error.

---

Full diff: https://github.com/llvm/llvm-project/pull/98024.diff

1 Files Affected:

• (modified) libc/src/math/generic/tan.cpp (+2-2)

diff --git a/libc/src/math/generic/tan.cpp b/libc/src/math/generic/tan.cpp
index e6230e9c1cd69..7f1385c4717dd 100644
--- a/libc/src/math/generic/tan.cpp
+++ b/libc/src/math/generic/tan.cpp
@@ -95,7 +95,7 @@ LIBC_INLINE DoubleDouble tan_eval(const DoubleDouble &u) {
 }
 
 // Accurate evaluation of tan for small u.
-Float128 tan_eval(const Float128 &u) {
+[[maybe_unused]] Float128 tan_eval(const Float128 &u) {
   Float128 u_sq = fputil::quick_mul(u, u);
 
   // tan(x) ~ x + x^3/3 + x^5 * 2/15 + x^7 * 17/315 + x^9 * 62/2835 +
@@ -127,7 +127,7 @@ Float128 tan_eval(const Float128 &u) {
 // Calculation a / b = a * (1/b) for Float128.
 // Using the initial approximation of q ~ (1/b), then apply 2 Newton-Raphson
 // iterations, before multiplying by a.
-Float128 newton_raphson_div(const Float128 &a, Float128 b, double q) {
+[[maybe_unused]] Float128 newton_raphson_div(const Float128 &a, Float128 b, double q) {
   Float128 q0(q);
   constexpr Float128 TWO(2.0);
   b.sign = (b.sign == Sign::POS) ? Sign::NEG : Sign::POS;

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 5c40e561bbc102f47553732fcebc0876b45d68b2 b2fc97b454853b19e7d38ef3d4f1ba35e17740bd -- libc/src/math/generic/tan.cpp

View the diff from clang-format here.

diff --git a/libc/src/math/generic/tan.cpp b/libc/src/math/generic/tan.cpp
index 7f1385c471..78d71c16c1 100644
--- a/libc/src/math/generic/tan.cpp
+++ b/libc/src/math/generic/tan.cpp
@@ -127,7 +127,8 @@ LIBC_INLINE DoubleDouble tan_eval(const DoubleDouble &u) {
 // Calculation a / b = a * (1/b) for Float128.
 // Using the initial approximation of q ~ (1/b), then apply 2 Newton-Raphson
 // iterations, before multiplying by a.
-[[maybe_unused]] Float128 newton_raphson_div(const Float128 &a, Float128 b, double q) {
+[[maybe_unused]] Float128 newton_raphson_div(const Float128 &a, Float128 b,
+                                             double q) {
   Float128 q0(q);
   constexpr Float128 TWO(2.0);
   b.sign = (b.sign == Sign::POS) ? Sign::NEG : Sign::POS;