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test: ztest: add base-e logarithm unit test converted from CMock
Convert the natural (base-e) logarithm math unit test from CMock/CMocka to Ztest. Port test_math_arithmetic_base_e_log_fixed from sof/test/cmocka/src/math/arithmetic/base_e_logarithm.c originally authored by Shriram Shastry <malladi.sastry@linux.intel.com>. Preserve the original reference data and tolerance, add the new Ztest source to the math advanced functions suite, and build src/math/log_e.c. Validated with west twister on native_sim using host/llvm. Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>
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‎test/ztest/unit/math/advanced/functions/CMakeLists.txt‎

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@@ -31,11 +31,13 @@ target_sources(app PRIVATE
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test_scalar_power_ztest.c
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test_base2_logarithm_ztest.c
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test_base10_logarithm_ztest.c
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test_base_e_logarithm_ztest.c
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test_exponential_ztest.c
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test_square_root_ztest.c
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${SOF_ROOT}/src/math/power.c
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${SOF_ROOT}/src/math/base2log.c
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${SOF_ROOT}/src/math/log_10.c
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${SOF_ROOT}/src/math/log_e.c
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${SOF_ROOT}/src/math/exp_fcn.c
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${SOF_ROOT}/src/math/sqrt_int16.c
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# Note: exp_fcn_hifi.c is conditionally compiled only for Xtensa HiFi platforms.

‎test/ztest/unit/math/advanced/functions/test_base_e_logarithm_ztest.c‎

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// SPDX-License-Identifier: BSD-3-Clause
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//
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// Copyright(c) 2026 Intel Corporation. All rights reserved.
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//
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// These contents may have been developed with support from one or more Intel-operated
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// generative artificial intelligence solutions.
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//
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// Converted from CMock to Ztest
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//
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// Original test from sof/test/cmocka/src/math/arithmetic/base_e_logarithm.c
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// Author: Shriram Shastry <malladi.sastry@linux.intel.com>
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#include <zephyr/ztest.h>
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#include <stdint.h>
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#include <math.h>
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#include <sof/math/log.h>
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/* 'Error[max] = 0.0000164133276926,THD(-dBc) = -95.6960671942683234' */
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/* 'Error[max] = rms(log() - double(log_int32()))' */
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/* 'THD = 20*log10(Error[max])' */
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#define CMP_TOLERANCE 0.0000164133276926
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/* Natural logarithm loge(X) reference table generated by matlab/Octave */
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/* UQ5.27 */
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static const double natural_log_lookup_table[] = {
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0.0000000000000000, 17.5855899268523359, 18.2787371074122831, 18.6842022155204468,
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18.9718842879722267, 19.1950278392864391, 19.3773493960803940, 19.5315000759076511,
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19.6650314685321739, 19.7828145041885577, 19.8881750198463827, 19.9834851996507084,
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20.0704965766403376, 20.1505392860869676, 20.2246472581140395, 20.2936401294912301,
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20.3581786505327571, 20.4188032722644479, 20.4759616860290699, 20.5300289072319480,
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20.5813222015588408, 20.6301123656733907, 20.6766323812583899, 20.7210841437836706,
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20.7636437581607112, 20.8044657526425461, 20.8436864657603671, 20.8814267937103786,
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20.9177944378507625, 20.9528857576336485, 20.9867873092828354, 21.0195771320810394,
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21.0513258303723845, 21.0820974890173112, 21.1119504521464485, 21.1409379890003279,
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21.1691088659487328, 21.1965078407425196, 21.2231760877918916, 21.2491515741640455,
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21.2744693821187845, 21.2991619946810467, 21.3232595462333343, 21.3467900436180038,
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21.3697795618183370, 21.3922524176471107, 21.4142313243436178, 21.4357375295432568,
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21.4567909387206548, 21.4774102259037889, 21.4976129332024932, 21.5174155604805932,
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21.5368336463203107, 21.5558818412742781, 21.5745739742703257, 21.5929231129229997,
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21.6109416184107097, 21.6286411954956677, 21.6460329381935921, 21.6631273715394208,
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21.6799344898427790, 21.6964637917813938, 21.7127243130127638, 21.7287246543415016,
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21.7444730112924880, 21.7599771978118319, 21.7752446699265008, 21.7902825472754031,
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21.8050976330453672, 21.8196964324517815, 21.8340851698895619, 21.8482698048676056,
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21.8622560468288185, 21.8760493689479993, 21.8896550209909755, 21.9030780413106569,
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21.9163232680485471, 21.9293953496040821, 21.9422987544284780, 21.9550377801946830,
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21.9676165623906030, 21.9800390823784895, 21.9923091749598925, 22.0044305354820757,
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22.0164067265188734, 22.0282411841561903, 22.0399372239099236, 22.0514980465667030,
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22.0629267423782807, 22.0742262976204415, 22.0853995982070579, 22.0964494343823858,
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22.1073785049035614, 22.1181894209970018, 22.1288847101032040, 22.1394668194234150,
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22.1499381192805984, 22.1603009063062437, 22.1705574064637361, 22.1807097776854185};
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/* testvector in Q32.0 */
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static const uint32_t uv[100] = {
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1ULL, 43383509ULL, 86767017ULL, 130150525ULL, 173534033ULL, 216917541ULL,
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260301049ULL, 303684557ULL, 347068065ULL, 390451573ULL, 433835081ULL, 477218589ULL,
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520602097ULL, 563985605ULL, 607369113ULL, 650752621ULL, 694136129ULL, 737519638ULL,
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780903146ULL, 824286654ULL, 867670162ULL, 911053670ULL, 954437178ULL, 997820686ULL,
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1041204194ULL, 1084587702ULL, 1127971210ULL, 1171354718ULL, 1214738226ULL, 1258121734ULL,
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1301505242ULL, 1344888750ULL, 1388272258ULL, 1431655766ULL, 1475039274ULL, 1518422782ULL,
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1561806290ULL, 1605189798ULL, 1648573306ULL, 1691956814ULL, 1735340322ULL, 1778723830ULL,
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1822107338ULL, 1865490846ULL, 1908874354ULL, 1952257862ULL, 1995641370ULL, 2039024878ULL,
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2082408386ULL, 2125791894ULL, 2169175403ULL, 2212558911ULL, 2255942419ULL, 2299325927ULL,
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2342709435ULL, 2386092943ULL, 2429476451ULL, 2472859959ULL, 2516243467ULL, 2559626975ULL,
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2603010483ULL, 2646393991ULL, 2689777499ULL, 2733161007ULL, 2776544515ULL, 2819928023ULL,
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2863311531ULL, 2906695039ULL, 2950078547ULL, 2993462055ULL, 3036845563ULL, 3080229071ULL,
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3123612579ULL, 3166996087ULL, 3210379595ULL, 3253763103ULL, 3297146611ULL, 3340530119ULL,
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3383913627ULL, 3427297135ULL, 3470680643ULL, 3514064151ULL, 3557447659ULL, 3600831168ULL,
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3644214676ULL, 3687598184ULL, 3730981692ULL, 3774365200ULL, 3817748708ULL, 3861132216ULL,
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3904515724ULL, 3947899232ULL, 3991282740ULL, 4034666248ULL, 4078049756ULL, 4121433264ULL,
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4164816772ULL, 4208200280ULL, 4251583788ULL, 4294967295ULL};
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/**
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* @brief Test natural (base-e) logarithm function with fixed-point arithmetic
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*
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* This test validates the ln_int32() function against MATLAB-generated reference
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* values. It tests 100 uniformly distributed input values across the full uint32_t
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* range, checking that the fixed-point logarithm calculation stays within acceptable
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* tolerance.
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*
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* Input values: Q32.0 format (unsigned 32-bit integers)
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* Result: UQ5.27 fixed-point format
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* Reference: MATLAB log() function results
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*/
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ZTEST(math_advanced_functions_suite, test_math_arithmetic_base_e_log_fixed)
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{
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int i;
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BUILD_ASSERT(ARRAY_SIZE(uv) == ARRAY_SIZE(natural_log_lookup_table),
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"Test vector size must match reference table size");
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for (i = 0; i < ARRAY_SIZE(uv); i++) {
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double logefxp = ln_int32(uv[i]);
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double diff = fabs(natural_log_lookup_table[i] - logefxp / (1 << 27));
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zassert_true(diff <= CMP_TOLERANCE,
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"ln_int32(%u): diff %.16f > tolerance (expected %.16f, got %.16f)",
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uv[i], diff, natural_log_lookup_table[i], logefxp / (1 << 27));
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}
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}

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