1 /*
2 * Single-precision vector sincos function.
3 *
4 * Copyright (c) 2023, Arm Limited.
5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
6 */
7
8 /* Define _GNU_SOURCE in order to include sincosf declaration. If building
9 pre-GLIBC 2.1, or on a non-GNU conforming system, this routine will need to
10 be linked against the scalar sincosf from math/. */
11 #define _GNU_SOURCE
12 #include <math.h>
13 #undef _GNU_SOURCE
14
15 #include "v_sincosf_common.h"
16 #include "v_math.h"
17 #include "pl_test.h"
18
19 static void VPCS_ATTR NOINLINE
special_case(float32x4_t x,uint32x4_t special,float * out_sin,float * out_cos)20 special_case (float32x4_t x, uint32x4_t special, float *out_sin,
21 float *out_cos)
22 {
23 for (int i = 0; i < 4; i++)
24 if (special[i])
25 sincosf (x[i], out_sin + i, out_cos + i);
26 }
27
28 /* Single-precision vector function allowing calculation of both sin and cos in
29 one function call, using shared argument reduction and separate low-order
30 polynomials.
31 Worst-case error for sin is 1.67 ULP:
32 v_sincosf_sin(0x1.c704c4p+19) got 0x1.fff698p-5 want 0x1.fff69cp-5
33 Worst-case error for cos is 1.81 ULP:
34 v_sincosf_cos(0x1.e506fp+19) got -0x1.ffec6ep-6 want -0x1.ffec72p-6. */
35 VPCS_ATTR void
_ZGVnN4vl4l4_sincosf(float32x4_t x,float * out_sin,float * out_cos)36 _ZGVnN4vl4l4_sincosf (float32x4_t x, float *out_sin, float *out_cos)
37 {
38 const struct v_sincosf_data *d = ptr_barrier (&v_sincosf_data);
39 uint32x4_t special = check_ge_rangeval (x, d);
40
41 float32x4x2_t sc = v_sincosf_inline (x, d);
42
43 vst1q_f32 (out_sin, sc.val[0]);
44 vst1q_f32 (out_cos, sc.val[1]);
45
46 if (unlikely (v_any_u32 (special)))
47 special_case (x, special, out_sin, out_cos);
48 }
49
50 PL_TEST_ULP (_ZGVnN4v_sincosf_sin, 1.17)
51 PL_TEST_ULP (_ZGVnN4v_sincosf_cos, 1.31)
52 #define V_SINCOSF_INTERVAL(lo, hi, n) \
53 PL_TEST_INTERVAL (_ZGVnN4v_sincosf_sin, lo, hi, n) \
54 PL_TEST_INTERVAL (_ZGVnN4v_sincosf_cos, lo, hi, n)
55 V_SINCOSF_INTERVAL (0, 0x1p20, 500000)
56 V_SINCOSF_INTERVAL (-0, -0x1p20, 500000)
57 V_SINCOSF_INTERVAL (0x1p20, inf, 10000)
58 V_SINCOSF_INTERVAL (-0x1p20, -inf, 10000)
59