[libc-commits] [libc] [libc][math] Implement double precision sin correctly rounded to all rounding modes. (PR #95736)

[via libc-commits]

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@@ -0,0 +1,67 @@
+//===-- Range reduction for double precision sin/cos/tan --------*- 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_MATH_GENERIC_RANGE_REDUCTION_DOUBLE_H
+#define LLVM_LIBC_SRC_MATH_GENERIC_RANGE_REDUCTION_DOUBLE_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/common.h"
+
+namespace LIBC_NAMESPACE {
+
+using fputil::DoubleDouble;
+
+LIBC_INLINE constexpr int FAST_PASS_EXPONENT = 23;
+
+// Digits of pi/128, generated by Sollya with:
+// > a = round(pi/128, D, RN);
+// > b = round(pi/128 - a, D, RN);
+LIBC_INLINE constexpr DoubleDouble PI_OVER_128 = {0x1.1a62633145c07p-60,
+                                                  0x1.921fb54442d18p-6};
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lntue wrote:

This is not needed here anymore.  Removed

https://github.com/llvm/llvm-project/pull/95736