| //===-- Single-precision sin function -------------------------------------===// |
| // |
| // 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 "src/math/sinf.h" |
| #include "math_utils.h" |
| #include "sincosf_utils.h" |
| |
| #include "src/__support/common.h" |
| #include <math.h> |
| |
| #include <stdint.h> |
| |
| namespace __llvm_libc { |
| |
| // Fast sinf implementation. Worst-case ULP is 0.5607, maximum relative |
| // error is 0.5303 * 2^-23. A single-step range reduction is used for |
| // small values. Large inputs have their range reduced using fast integer |
| // arithmetic. |
| LLVM_LIBC_FUNCTION(float, sinf, (float y)) { |
| double x = y; |
| double s; |
| int n; |
| const sincos_t *p = &__sincosf_table[0]; |
| |
| if (abstop12(y) < abstop12(pio4)) { |
| s = x * x; |
| |
| if (unlikely(abstop12(y) < abstop12(as_float(0x39800000)))) { |
| if (unlikely(abstop12(y) < abstop12(as_float(0x800000)))) |
| // Force underflow for tiny y. |
| force_eval<float>(s); |
| return y; |
| } |
| |
| return sinf_poly(x, s, p, 0); |
| } else if (likely(abstop12(y) < abstop12(120.0f))) { |
| x = reduce_fast(x, p, &n); |
| |
| // Setup the signs for sin and cos. |
| s = p->sign[n & 3]; |
| |
| if (n & 2) |
| p = &__sincosf_table[1]; |
| |
| return sinf_poly(x * s, x * x, p, n); |
| } else if (abstop12(y) < abstop12(INFINITY)) { |
| uint32_t xi = as_uint32_bits(y); |
| int sign = xi >> 31; |
| |
| x = reduce_large(xi, &n); |
| |
| // Setup signs for sin and cos - include original sign. |
| s = p->sign[(n + sign) & 3]; |
| |
| if ((n + sign) & 2) |
| p = &__sincosf_table[1]; |
| |
| return sinf_poly(x * s, x * x, p, n); |
| } |
| |
| return invalid(y); |
| } |
| |
| } // namespace __llvm_libc |