1 //===-- Unittests for roundf ----------------------------------------------===// 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/roundf.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<float>; 21 using Properties = __llvm_libc::fputil::FloatProperties<float>; 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(RoundfTest, SpecialNumbers) { 30 EXPECT_EQ( 31 BitPatterns::aQuietNaN, 32 valueAsBits(__llvm_libc::roundf(valueFromBits(BitPatterns::aQuietNaN)))); 33 EXPECT_EQ(BitPatterns::aNegativeQuietNaN, 34 valueAsBits(__llvm_libc::roundf( 35 valueFromBits(BitPatterns::aNegativeQuietNaN)))); 36 37 EXPECT_EQ(BitPatterns::aSignallingNaN, 38 valueAsBits(__llvm_libc::roundf( 39 valueFromBits(BitPatterns::aSignallingNaN)))); 40 EXPECT_EQ(BitPatterns::aNegativeSignallingNaN, 41 valueAsBits(__llvm_libc::roundf( 42 valueFromBits(BitPatterns::aNegativeSignallingNaN)))); 43 44 EXPECT_EQ(BitPatterns::inf, 45 valueAsBits(__llvm_libc::roundf(valueFromBits(BitPatterns::inf)))); 46 EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::roundf( 47 valueFromBits(BitPatterns::negInf)))); 48 49 EXPECT_EQ(BitPatterns::zero, 50 valueAsBits(__llvm_libc::roundf(valueFromBits(BitPatterns::zero)))); 51 EXPECT_EQ(BitPatterns::negZero, valueAsBits(__llvm_libc::roundf( 52 valueFromBits(BitPatterns::negZero)))); 53 } 54 55 TEST(RoundfTest, RoundedNumbers) { 56 EXPECT_EQ(valueAsBits(1.0f), valueAsBits(__llvm_libc::roundf(1.0f))); 57 EXPECT_EQ(valueAsBits(-1.0f), valueAsBits(__llvm_libc::roundf(-1.0f))); 58 EXPECT_EQ(valueAsBits(10.0f), valueAsBits(__llvm_libc::roundf(10.0f))); 59 EXPECT_EQ(valueAsBits(-10.0f), valueAsBits(__llvm_libc::roundf(-10.0f))); 60 EXPECT_EQ(valueAsBits(12345.0f), valueAsBits(__llvm_libc::roundf(12345.0f))); 61 EXPECT_EQ(valueAsBits(-12345.0f), 62 valueAsBits(__llvm_libc::roundf(-12345.0f))); 63 } 64 65 TEST(RoundfTest, CloseToZeroNumbers) { 66 EXPECT_EQ(valueAsBits(1.0f), valueAsBits(__llvm_libc::roundf(0.5f))); 67 EXPECT_EQ(valueAsBits(-1.0f), valueAsBits(__llvm_libc::roundf(-0.5f))); 68 EXPECT_EQ(valueAsBits(0.0f), valueAsBits(__llvm_libc::roundf(0.115f))); 69 EXPECT_EQ(valueAsBits(-0.0f), valueAsBits(__llvm_libc::roundf(-0.115f))); 70 EXPECT_EQ(valueAsBits(1.0f), valueAsBits(__llvm_libc::roundf(0.715f))); 71 EXPECT_EQ(valueAsBits(-1.0f), valueAsBits(__llvm_libc::roundf(-0.715f))); 72 } 73 74 TEST(RoundfTest, InFloatRange) { 75 using BitsType = Properties::BitsType; 76 constexpr BitsType count = 1000000; 77 constexpr BitsType step = UINT32_MAX / count; 78 for (BitsType i = 0, v = 0; i <= count; ++i, v += step) { 79 double x = valueFromBits(v); 80 if (isnan(x) || isinf(x)) 81 continue; 82 ASSERT_MPFR_MATCH(mpfr::Operation::Round, x, __llvm_libc::roundf(x), 83 tolerance); 84 } 85 } 86