[libc] [llvm] [libc][math] Add float-only implementation for sinf / cosf. (PR #161680)

[via llvm-commits]

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+//===-- Compute sin + cos for small angles ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_SINCOSF_FLOAT_EVAL_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_SINCOSF_FLOAT_EVAL_H
+
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/double_double.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/FPUtil/nearest_integer.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+namespace sincosf_float_eval {
+
+// Since the worst case of `x mod pi` in single precision is > 2^-28, in order
+// to be bounded by 1 ULP, the range reduction accuracy will need to be at
+// lest 2^(-28 - 23) = 2^-51.
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lntue wrote:

Done.

https://github.com/llvm/llvm-project/pull/161680