1 /*
2 * Single-precision vector log(x + 1) function.
3 *
4 * Copyright (c) 2023-2024, Arm Limited.
5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
6 */
7
8 #include "sv_math.h"
9 #include "test_sig.h"
10 #include "test_defs.h"
11 #include "sv_log1pf_inline.h"
12
13 static svfloat32_t NOINLINE
special_case(svfloat32_t x,svbool_t special)14 special_case (svfloat32_t x, svbool_t special)
15 {
16 return sv_call_f32 (log1pf, x, sv_log1pf_inline (x, svptrue_b32 ()),
17 special);
18 }
19
20 /* Vector log1pf approximation using polynomial on reduced interval. Worst-case
21 error is 1.27 ULP very close to 0.5.
22 _ZGVsMxv_log1pf(0x1.fffffep-2) got 0x1.9f324p-2
23 want 0x1.9f323ep-2. */
SV_NAME_F1(log1p)24 svfloat32_t SV_NAME_F1 (log1p) (svfloat32_t x, svbool_t pg)
25 {
26 /* x < -1, Inf/Nan. */
27 svbool_t special = svcmpeq (pg, svreinterpret_u32 (x), 0x7f800000);
28 special = svorn_z (pg, special, svcmpge (pg, x, -1));
29
30 if (unlikely (svptest_any (pg, special)))
31 return special_case (x, special);
32
33 return sv_log1pf_inline (x, pg);
34 }
35
36 TEST_SIG (SV, F, 1, log1p, -0.9, 10.0)
37 TEST_ULP (SV_NAME_F1 (log1p), 0.77)
38 TEST_DISABLE_FENV (SV_NAME_F1 (log1p))
39 TEST_SYM_INTERVAL (SV_NAME_F1 (log1p), 0, 0x1p-23, 5000)
40 TEST_SYM_INTERVAL (SV_NAME_F1 (log1p), 0x1p-23, 1, 5000)
41 TEST_INTERVAL (SV_NAME_F1 (log1p), 1, inf, 10000)
42 TEST_INTERVAL (SV_NAME_F1 (log1p), -1, -inf, 10)
43 CLOSE_SVE_ATTR
44