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 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. */ 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