| //===-- Unittests for atan2f ----------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "hdr/math_macros.h" |
| #include "src/__support/FPUtil/FPBits.h" |
| #include "src/math/atan2f.h" |
| #include "test/UnitTest/FPMatcher.h" |
| #include "test/UnitTest/Test.h" |
| #include "utils/MPFRWrapper/MPFRUtils.h" |
| |
| using LlvmLibcAtan2fTest = LIBC_NAMESPACE::testing::FPTest<float>; |
| using LIBC_NAMESPACE::testing::tlog; |
| |
| namespace mpfr = LIBC_NAMESPACE::testing::mpfr; |
| |
| TEST_F(LlvmLibcAtan2fTest, TrickyInputs) { |
| constexpr int N = 17; |
| mpfr::BinaryInput<float> INPUTS[N] = { |
| {0x1.0cb3a4p+20f, 0x1.4ebacp+22f}, {0x1.12215p+1f, 0x1.4fabfcp+22f}, |
| {-0x1.13baaep+41f, 0x1.5bd22ep+23f}, {0x1.1ff7dcp+41f, 0x1.aec0a6p+23f}, |
| {0x1.2bc794p+23f, 0x1.0bc0c6p+23f}, {0x1.2fba3ap+42f, 0x1.f99456p+23f}, |
| {0x1.5ea1f8p+27f, 0x1.f2a1aep+23f}, {0x1.7a931p+44f, 0x1.352ac4p+22f}, |
| {0x1.8802bcp+21f, 0x1.8f130ap+23f}, {0x1.658ef8p+17f, 0x1.3c00f4p+22f}, |
| {0x1.69fb0cp+21f, 0x1.39e4c4p+23f}, {0x1.8eb24cp+11f, 0x1.36518p+23f}, |
| {0x1.9e7ebp+30f, 0x1.d80522p+23f}, {0x1.b4bdeep+19f, 0x1.c19b4p+23f}, |
| {0x1.bc201p+43f, 0x1.617346p+23f}, {0x1.c96c3cp+20f, 0x1.c01d1ep+23f}, |
| {0x1.781fcp+28f, 0x1.dcb3cap+23f}, |
| }; |
| |
| for (int i = 0; i < N; ++i) { |
| float x = INPUTS[i].x; |
| float y = INPUTS[i].y; |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan2, INPUTS[i], |
| LIBC_NAMESPACE::atan2f(x, y), 0.5); |
| INPUTS[i].x = -INPUTS[i].x; |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan2, INPUTS[i], |
| LIBC_NAMESPACE::atan2f(-x, y), 0.5); |
| INPUTS[i].y = -INPUTS[i].y; |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan2, INPUTS[i], |
| LIBC_NAMESPACE::atan2f(-x, -y), 0.5); |
| INPUTS[i].x = -INPUTS[i].x; |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan2, INPUTS[i], |
| LIBC_NAMESPACE::atan2f(x, -y), 0.5); |
| } |
| } |
| |
| TEST_F(LlvmLibcAtan2fTest, InFloatRange) { |
| constexpr uint32_t X_COUNT = 1'23; |
| constexpr uint32_t X_START = FPBits(0.25f).uintval(); |
| constexpr uint32_t X_STOP = FPBits(4.0f).uintval(); |
| constexpr uint32_t X_STEP = (X_STOP - X_START) / X_COUNT; |
| |
| constexpr uint32_t Y_COUNT = 1'37; |
| constexpr uint32_t Y_START = FPBits(0.25f).uintval(); |
| constexpr uint32_t Y_STOP = FPBits(4.0f).uintval(); |
| constexpr uint32_t Y_STEP = (Y_STOP - Y_START) / Y_COUNT; |
| |
| auto test = [&](mpfr::RoundingMode rounding_mode) { |
| mpfr::ForceRoundingMode __r(rounding_mode); |
| if (!__r.success) |
| return; |
| |
| uint64_t fails = 0; |
| uint64_t finite_count = 0; |
| uint64_t total_count = 0; |
| float failed_x, failed_y, failed_r = 0.0; |
| double tol = 0.5; |
| |
| for (uint32_t i = 0, v = X_START; i <= X_COUNT; ++i, v += X_STEP) { |
| float x = FPBits(v).get_val(); |
| if (isnan(x) || isinf(x) || x < 0.0) |
| continue; |
| |
| for (uint32_t j = 0, w = Y_START; j <= Y_COUNT; ++j, w += Y_STEP) { |
| float y = FPBits(w).get_val(); |
| if (isnan(y) || isinf(y)) |
| continue; |
| |
| LIBC_NAMESPACE::libc_errno = 0; |
| float result = LIBC_NAMESPACE::atan2f(x, y); |
| ++total_count; |
| if (isnan(result) || isinf(result)) |
| continue; |
| |
| ++finite_count; |
| mpfr::BinaryInput<float> inputs{x, y}; |
| |
| if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Atan2, inputs, |
| result, 0.5, rounding_mode)) { |
| ++fails; |
| while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY( |
| mpfr::Operation::Atan2, inputs, result, tol, rounding_mode)) { |
| failed_x = x; |
| failed_y = y; |
| failed_r = result; |
| |
| if (tol > 1000.0) |
| break; |
| |
| tol *= 2.0; |
| } |
| } |
| } |
| } |
| if (fails || (finite_count < total_count)) { |
| tlog << " Atan2f failed: " << fails << "/" << finite_count << "/" |
| << total_count << " tests.\n" |
| << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n"; |
| } |
| if (fails) { |
| mpfr::BinaryInput<float> inputs{failed_x, failed_y}; |
| EXPECT_MPFR_MATCH(mpfr::Operation::Atan2, inputs, failed_r, 0.5, |
| rounding_mode); |
| } |
| }; |
| |
| tlog << " Test Rounding To Nearest...\n"; |
| test(mpfr::RoundingMode::Nearest); |
| |
| tlog << " Test Rounding Downward...\n"; |
| test(mpfr::RoundingMode::Downward); |
| |
| tlog << " Test Rounding Upward...\n"; |
| test(mpfr::RoundingMode::Upward); |
| |
| tlog << " Test Rounding Toward Zero...\n"; |
| test(mpfr::RoundingMode::TowardZero); |
| } |