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 "sv_sincosf_common.h"
16 #include "sv_math.h"
17 #include "pl_test.h"
18
19 static void NOINLINE
special_case(svfloat32_t x,svbool_t special,float * out_sin,float * out_cos)20 special_case (svfloat32_t x, svbool_t special, float *out_sin, float *out_cos)
21 {
22 svbool_t p = svptrue_pat_b32 (SV_VL1);
23 for (int i = 0; i < svcntw (); i++)
24 {
25 if (svptest_any (special, p))
26 sincosf (svlastb (p, x), out_sin + i, out_cos + i);
27 p = svpnext_b32 (svptrue_b32 (), p);
28 }
29 }
30
31 /* Single-precision vector function allowing calculation of both sin and cos in
32 one function call, using shared argument reduction and separate low-order
33 polynomials.
34 Worst-case error for sin is 1.67 ULP:
35 sv_sincosf_sin(0x1.c704c4p+19) got 0x1.fff698p-5 want 0x1.fff69cp-5
36 Worst-case error for cos is 1.81 ULP:
37 sv_sincosf_cos(0x1.e506fp+19) got -0x1.ffec6ep-6 want -0x1.ffec72p-6. */
38 void
_ZGVsMxvl4l4_sincosf(svfloat32_t x,float * out_sin,float * out_cos,svbool_t pg)39 _ZGVsMxvl4l4_sincosf (svfloat32_t x, float *out_sin, float *out_cos,
40 svbool_t pg)
41 {
42 const struct sv_sincosf_data *d = ptr_barrier (&sv_sincosf_data);
43 svbool_t special = check_ge_rangeval (pg, x, d);
44
45 svfloat32x2_t sc = sv_sincosf_inline (pg, x, d);
46
47 svst1_f32 (pg, out_sin, svget2 (sc, 0));
48 svst1_f32 (pg, out_cos, svget2 (sc, 1));
49
50 if (unlikely (svptest_any (pg, special)))
51 special_case (x, special, out_sin, out_cos);
52 }
53
54 PL_TEST_ULP (_ZGVsMxv_sincosf_sin, 1.17)
55 PL_TEST_ULP (_ZGVsMxv_sincosf_cos, 1.31)
56 #define SV_SINCOSF_INTERVAL(lo, hi, n) \
57 PL_TEST_INTERVAL (_ZGVsMxv_sincosf_sin, lo, hi, n) \
58 PL_TEST_INTERVAL (_ZGVsMxv_sincosf_cos, lo, hi, n)
59 SV_SINCOSF_INTERVAL (0, 0x1p20, 500000)
60 SV_SINCOSF_INTERVAL (-0, -0x1p20, 500000)
61 SV_SINCOSF_INTERVAL (0x1p20, inf, 10000)
62 SV_SINCOSF_INTERVAL (-0x1p20, -inf, 10000)
63