1 //===-- Unittests for trunc -----------------------------------------------===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "include/math.h" 10 #include "src/math/trunc.h" 11 #include "utils/FPUtil/BitPatterns.h" 12 #include "utils/FPUtil/FloatOperations.h" 13 #include "utils/FPUtil/FloatProperties.h" 14 #include "utils/MPFRWrapper/MPFRUtils.h" 15 #include "utils/UnitTest/Test.h" 16 17 using __llvm_libc::fputil::valueAsBits; 18 using __llvm_libc::fputil::valueFromBits; 19 20 using BitPatterns = __llvm_libc::fputil::BitPatterns<double>; 21 using Properties = __llvm_libc::fputil::FloatProperties<double>; 22 23 namespace mpfr = __llvm_libc::testing::mpfr; 24 25 // Zero tolerance; As in, exact match with MPFR result. 26 static constexpr mpfr::Tolerance tolerance{mpfr::Tolerance::doublePrecision, 0, 27 0}; 28 29 TEST(TruncTest, SpecialNumbers) { 30 EXPECT_EQ( 31 BitPatterns::aQuietNaN, 32 valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::aQuietNaN)))); 33 EXPECT_EQ(BitPatterns::aNegativeQuietNaN, 34 valueAsBits(__llvm_libc::trunc( 35 valueFromBits(BitPatterns::aNegativeQuietNaN)))); 36 37 EXPECT_EQ(BitPatterns::aSignallingNaN, 38 valueAsBits(__llvm_libc::trunc( 39 valueFromBits(BitPatterns::aSignallingNaN)))); 40 EXPECT_EQ(BitPatterns::aNegativeSignallingNaN, 41 valueAsBits(__llvm_libc::trunc( 42 valueFromBits(BitPatterns::aNegativeSignallingNaN)))); 43 44 EXPECT_EQ(BitPatterns::inf, 45 valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::inf)))); 46 EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::trunc( 47 valueFromBits(BitPatterns::negInf)))); 48 49 EXPECT_EQ(BitPatterns::zero, 50 valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::zero)))); 51 EXPECT_EQ(BitPatterns::negZero, valueAsBits(__llvm_libc::trunc( 52 valueFromBits(BitPatterns::negZero)))); 53 } 54 55 TEST(TruncTest, RoundedNumbers) { 56 EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::trunc(1.0))); 57 EXPECT_EQ(valueAsBits(-1.0), valueAsBits(__llvm_libc::trunc(-1.0))); 58 EXPECT_EQ(valueAsBits(10.0), valueAsBits(__llvm_libc::trunc(10.0))); 59 EXPECT_EQ(valueAsBits(-10.0), valueAsBits(__llvm_libc::trunc(-10.0))); 60 EXPECT_EQ(valueAsBits(12345.0), valueAsBits(__llvm_libc::trunc(12345.0))); 61 EXPECT_EQ(valueAsBits(-12345.0), valueAsBits(__llvm_libc::trunc(-12345.0))); 62 } 63 64 TEST(truncTest, InDoubleRange) { 65 using BitsType = Properties::BitsType; 66 constexpr BitsType count = 1000000; 67 constexpr BitsType step = UINT64_MAX / count; 68 for (BitsType i = 0, v = 0; i <= count; ++i, v += step) { 69 double x = valueFromBits(v); 70 if (isnan(x) || isinf(x)) 71 continue; 72 ASSERT_MPFR_MATCH(mpfr::Operation::Trunc, x, __llvm_libc::trunc(x), 73 tolerance); 74 } 75 } 76