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1//===-- Utility class to test fxdivi functions ------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/CPP/type_traits.h"10#include "src/__support/fixed_point/fx_bits.h"11#include "src/__support/fixed_point/fx_rep.h"12#include "test/UnitTest/Test.h"13 14template <typename XType> XType get_epsilon() = delete;15template <> fract get_epsilon() { return FRACT_EPSILON; }16template <> unsigned fract get_epsilon() { return UFRACT_EPSILON; }17template <> long fract get_epsilon() { return LFRACT_EPSILON; }18 19template <typename XType>20class DivITest : public LIBC_NAMESPACE::testing::Test {21 using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<XType>;22 using FXBits = LIBC_NAMESPACE::fixed_point::FXBits<XType>;23 24public:25 typedef XType (*DivIFunc)(int, int);26 27 void testBasic(DivIFunc func) {28 XType epsilon = get_epsilon<XType>();29 EXPECT_LT((func(2, 3) - 0.666656494140625r), epsilon);30 EXPECT_LT((func(3, 4) - 0.75r), epsilon);31 EXPECT_LT((func(1043, 2764) - 0.3773516643r), epsilon);32 EXPECT_LT((func(60000, 720293) - 0.08329943509r), epsilon);33 34 EXPECT_EQ(func(128, 256), 0.5r);35 EXPECT_EQ(func(1, 2), 0.5r);36 EXPECT_EQ(func(1, 4), 0.25r);37 EXPECT_EQ(func(1, 8), 0.125r);38 EXPECT_EQ(func(1, 16), 0.0625r);39 40 EXPECT_EQ(func(-1, 2), -0.5r);41 EXPECT_EQ(func(1, -4), -0.25r);42 EXPECT_EQ(func(-1, 8), -0.125r);43 EXPECT_EQ(func(1, -16), -0.0625r);44 }45 46 void testSpecial(DivIFunc func) {47 XType epsilon = get_epsilon<XType>();48 EXPECT_EQ(func(0, 10), 0.r);49 EXPECT_EQ(func(0, -10), 0.r);50 EXPECT_EQ(func(-(1 << FRACT_FBIT), 1 << FRACT_FBIT), FRACT_MIN);51 EXPECT_EQ(func((1 << FRACT_FBIT) - 1, 1 << FRACT_FBIT), FRACT_MAX);52 // From Section 7.18a.6.1, functions returning a fixed-point value, the53 // return value is saturated on overflow.54 EXPECT_EQ(func(INT_MAX, INT_MAX), FRACT_MAX);55 EXPECT_LT(func(INT_MAX - 1, INT_MAX) - 0.99999999r, epsilon);56 EXPECT_EQ(func(INT_MIN, INT_MAX), FRACT_MIN);57 // Expecting 0 here as fract is not precise enough to58 // handle 1/INT_MAX59 EXPECT_LT(func(1, INT_MAX) - 0.r, epsilon);60 // This results in 1.1739, which should be saturated to FRACT_MAX61 EXPECT_EQ(func(27, 23), FRACT_MAX);62 63 EXPECT_EQ(func(INT_MIN, 1), FRACT_MIN);64 EXPECT_LT(func(1, INT_MIN) - 0.r, epsilon);65 66 EXPECT_EQ(func(INT_MIN, INT_MIN), 1.r);67 }68};69 70#define LIST_DIVI_TESTS(Name, XType, func) \71 using LlvmLibc##Name##diviTest = DivITest<XType>; \72 TEST_F(LlvmLibc##Name##diviTest, Basic) { testBasic(&func); } \73 TEST_F(LlvmLibc##Name##diviTest, Special) { testSpecial(&func); } \74 static_assert(true, "Require semicolon.")75