| 1 | //===-- Utility class to test int to fixed point conversions ----*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "test/UnitTest/Test.h" |
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| 10 | |
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| 11 | #include "include/llvm-libc-types/stdfix-types.h" |
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| 12 | #include "src/__support/CPP/bit.h" |
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| 13 | #include "src/__support/fixed_point/fx_bits.h" |
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| 14 | |
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| 15 | template <typename T, typename XType> |
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| 16 | class FxBitsTest : public LIBC_NAMESPACE::testing::Test { |
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| 17 | using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<T>; |
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| 18 | static constexpr T zero = FXRep::ZERO(); |
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| 19 | static constexpr T min = FXRep::MIN(); |
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| 20 | static constexpr T max = FXRep::MAX(); |
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| 21 | static constexpr T half = static_cast<T>(0.5); |
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| 22 | static constexpr T quarter = static_cast<T>(0.25); |
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| 23 | static constexpr T one = |
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| 24 | (FXRep::INTEGRAL_LEN > 0) ? static_cast<T>(1) : FXRep::MAX(); |
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| 25 | static constexpr T eps = FXRep::EPS(); |
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| 26 | constexpr XType get_one_or_saturated_fraction() { |
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| 27 | if (FXRep::INTEGRAL_LEN > 0) { |
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| 28 | return static_cast<XType>(static_cast<XType>(0x1) << FXRep::FRACTION_LEN); |
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| 29 | } else { |
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| 30 | return static_cast<XType>( |
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| 31 | LIBC_NAMESPACE::mask_trailing_ones<typename FXRep::StorageType, |
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| 32 | FXRep::FRACTION_LEN>()); |
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| 33 | } |
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| 34 | } |
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| 35 | |
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| 36 | public: |
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| 37 | typedef T (*FxBitsFunc)(XType); |
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| 38 | |
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| 39 | void test_special_numbers(FxBitsFunc func) { |
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| 40 | EXPECT_EQ(zero, func(0)); |
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| 41 | EXPECT_EQ(eps, func(0x1)); |
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| 42 | // x.1000... |
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| 43 | EXPECT_EQ(half, func(static_cast<XType>(0x1) << (FXRep::FRACTION_LEN - 1))); |
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| 44 | // Occupy the bit to the left of the fixed point for Accum types |
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| 45 | // Saturate fraction portion for Fract types |
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| 46 | EXPECT_EQ(one, func(get_one_or_saturated_fraction())); |
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| 47 | } |
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| 48 | }; |
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| 49 | |
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| 50 | #define LIST_FXBITS_TEST(Name, T, XType, func) \ |
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| 51 | using LlvmLibc##Name##BitsTest = FxBitsTest<T, XType>; \ |
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| 52 | TEST_F(LlvmLibc##Name##BitsTest, SpecialNumbers) { \ |
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| 53 | test_special_numbers(&func); \ |
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| 54 | } \ |
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| 55 | static_assert(true, "Require semicolon.") |
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| 56 | |
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