xref: /llvm-project-15.0.7/libc/src/math/generic/sincosf_data.cpp (revision 75d2fcb0)

//===-- sinf/cosf data tables ---------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "math_utils.h"
#include "sincosf_utils.h"

#include <stdint.h>

namespace __llvm_libc {

// The constants and polynomials for sine and cosine.  The 2nd entry
// computes -cos (x) rather than cos (x) to get negation for free.
constexpr sincos_t SINCOSF_TABLE[2] = {
    {{1.0, -1.0, -1.0, 1.0},
     0x1.45f306dc9c883p+23,
     0x1.921fb54442d18p+0,
     0x1p+0,
     -0x1.ffffffd0c621cp-2,
     0x1.55553e1068f19p-5,
     -0x1.6c087e89a359dp-10,
     0x1.99343027bf8c3p-16,
     -0x1.555545995a603p-3,
     0x1.1107605230bc4p-7,
     -0x1.994eb3774cf24p-13},
    {{1.0, -1.0, -1.0, 1.0},
     0x1.45f306dc9c883p+23,
     0x1.921fb54442d18p+0,
     -0x1p+0,
     0x1.ffffffd0c621cp-2,
     -0x1.55553e1068f19p-5,
     0x1.6c087e89a359dp-10,
     -0x1.99343027bf8c3p-16,
     -0x1.555545995a603p-3,
     0x1.1107605230bc4p-7,
     -0x1.994eb3774cf24p-13},
};

// Table with 4/PI to 192 bit precision.  To avoid unaligned accesses
// only 8 new bits are added per entry, making the table 4 times larger.
constexpr uint32_t INV_PIO4[24] = {
    0xa2,       0xa2f9,     0xa2f983,   0xa2f9836e, 0xf9836e4e, 0x836e4e44,
    0x6e4e4415, 0x4e441529, 0x441529fc, 0x1529fc27, 0x29fc2757, 0xfc2757d1,
    0x2757d1f5, 0x57d1f534, 0xd1f534dd, 0xf534ddc0, 0x34ddc0db, 0xddc0db62,
    0xc0db6295, 0xdb629599, 0x6295993c, 0x95993c43, 0x993c4390, 0x3c439041};

} // namespace __llvm_libc