mirror of
https://github.com/SerenityOS/serenity
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122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
/*
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* Copyright (c) 2023, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <fenv.h>
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// TODO: Add tests for floating-point exception management.
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static constexpr auto reset_rounding_mode = [] { fesetround(FE_TONEAREST); };
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#if !ARCH(RISCV64)
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# define TOMAXMAGNITUDE_DECAYS_TO_TONEAREST
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#endif
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TEST_CASE(float_round_up)
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{
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// Non-default rounding mode should not escape files with -frounding-math.
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_UPWARD);
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EXPECT_EQ(0.1f + 0.2f, 0.3f);
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EXPECT_EQ(0.1f + 0.3f, 0.40000004f);
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EXPECT_EQ(0.1f + 0.4f, 0.50000006f);
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EXPECT_EQ(-1.f + -0.1f, -1.0999999f);
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EXPECT_EQ(1.f + 0.1f, 1.1f);
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}
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TEST_CASE(float_round_down)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_DOWNWARD);
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EXPECT_EQ(0.1f + 0.2f, 0.29999998f);
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EXPECT_EQ(0.1f + 0.3f, 0.4f);
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EXPECT_EQ(0.1f + 0.4f, 0.5f);
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EXPECT_EQ(-1.f + -0.1f, -1.1f);
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EXPECT_EQ(1.f + 0.1f, 1.0999999f);
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}
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TEST_CASE(float_round_to_zero)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_TOWARDZERO);
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EXPECT_EQ(0.1f + 0.2f, 0.29999998f);
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EXPECT_EQ(0.1f + 0.3f, 0.4f);
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EXPECT_EQ(0.1f + 0.4f, 0.5f);
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EXPECT_EQ(-1.f + -0.1f, -1.0999999f);
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EXPECT_EQ(1.f + 0.1f, 1.0999999f);
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}
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TEST_CASE(float_round_to_nearest)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_TONEAREST);
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EXPECT_EQ(0.1f + 0.2f, 0.3f);
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EXPECT_EQ(0.1f + 0.3f, 0.4f);
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EXPECT_EQ(0.1f + 0.4f, 0.5f);
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EXPECT_EQ(-1.f + -0.1f, -1.1f);
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EXPECT_EQ(1.f + 0.1f, 1.1f);
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EXPECT_EQ(1.f + 5.9604645e-08f, 1.f);
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}
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TEST_CASE(float_round_to_max_magnitude)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_TOMAXMAGNITUDE);
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EXPECT_EQ(0.1f + 0.2f, 0.3f);
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EXPECT_EQ(0.1f + 0.3f, 0.4f);
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EXPECT_EQ(0.1f + 0.4f, 0.5f);
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EXPECT_EQ(-1.f + -0.1f, -1.1f);
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EXPECT_EQ(1.f + 0.1f, 1.1f);
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#ifdef TOMAXMAGNITUDE_DECAYS_TO_TONEAREST
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EXPECT_EQ(1.f + 5.9604645e-08f, 1.f);
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#else
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EXPECT_EQ(1.f + 5.9604645e-08f, 1.0000001f);
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#endif
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}
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TEST_CASE(store_round_in_env)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_DOWNWARD);
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fenv_t env;
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fegetenv(&env);
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fesetround(FE_UPWARD);
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// This result only happens under upward rounding.
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EXPECT_EQ(-1.f + -0.1f, -1.0999999f);
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fesetenv(&env);
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// ... and this only under downward rounding.
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EXPECT_EQ(-1.f + -0.1f, -1.1f);
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}
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TEST_CASE(save_restore_round)
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{
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ScopeGuard rounding_mode_guard = reset_rounding_mode;
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fesetround(FE_DOWNWARD);
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auto rounding_mode = fegetround();
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EXPECT_EQ(rounding_mode, FE_DOWNWARD);
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fesetround(FE_UPWARD);
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EXPECT_EQ(fegetround(), FE_UPWARD);
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EXPECT_EQ(-1.f + -0.1f, -1.0999999f);
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fesetround(rounding_mode);
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EXPECT_EQ(-1.f + -0.1f, -1.1f);
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fesetround(FE_TOMAXMAGNITUDE);
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#ifdef TOMAXMAGNITUDE_DECAYS_TO_TONEAREST
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// Max-magnitude rounding is not supported by x86, so we expect fesetround to decay it to some other rounding mode.
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EXPECT_EQ(fegetround(), FE_TONEAREST);
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#else
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EXPECT_EQ(fegetround(), FE_TOMAXMAGNITUDE);
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#endif
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}
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