1 //===-- Unittests for truncf ----------------------------------------------===//
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/truncf.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::floatPrecision, 0,
27                                            0};
28 
29 namespace mpfr = __llvm_libc::testing::mpfr;
30 TEST(TruncfTest, SpecialNumbers) {
31   EXPECT_EQ(
32       BitPatterns::aQuietNaN,
33       valueAsBits(__llvm_libc::truncf(valueFromBits(BitPatterns::aQuietNaN))));
34   EXPECT_EQ(BitPatterns::aNegativeQuietNaN,
35             valueAsBits(__llvm_libc::truncf(
36                 valueFromBits(BitPatterns::aNegativeQuietNaN))));
37 
38   EXPECT_EQ(BitPatterns::aSignallingNaN,
39             valueAsBits(__llvm_libc::truncf(
40                 valueFromBits(BitPatterns::aSignallingNaN))));
41   EXPECT_EQ(BitPatterns::aNegativeSignallingNaN,
42             valueAsBits(__llvm_libc::truncf(
43                 valueFromBits(BitPatterns::aNegativeSignallingNaN))));
44 
45   EXPECT_EQ(BitPatterns::inf,
46             valueAsBits(__llvm_libc::truncf(valueFromBits(BitPatterns::inf))));
47   EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::truncf(
48                                      valueFromBits(BitPatterns::negInf))));
49 
50   EXPECT_EQ(BitPatterns::zero,
51             valueAsBits(__llvm_libc::truncf(valueFromBits(BitPatterns::zero))));
52   EXPECT_EQ(BitPatterns::negZero, valueAsBits(__llvm_libc::truncf(
53                                       valueFromBits(BitPatterns::negZero))));
54 }
55 
56 TEST(TruncfTest, RoundedNumbers) {
57   EXPECT_EQ(valueAsBits(1.0f), valueAsBits(__llvm_libc::truncf(1.0f)));
58   EXPECT_EQ(valueAsBits(-1.0f), valueAsBits(__llvm_libc::truncf(-1.0f)));
59   EXPECT_EQ(valueAsBits(10.0f), valueAsBits(__llvm_libc::truncf(10.0f)));
60   EXPECT_EQ(valueAsBits(-10.0f), valueAsBits(__llvm_libc::truncf(-10.0f)));
61   EXPECT_EQ(valueAsBits(12345.0f), valueAsBits(__llvm_libc::truncf(12345.0f)));
62   EXPECT_EQ(valueAsBits(-12345.0f),
63             valueAsBits(__llvm_libc::truncf(-12345.0f)));
64 }
65 
66 TEST(TruncfTest, InFloatRange) {
67   using BitsType = Properties::BitsType;
68   constexpr BitsType count = 1000000;
69   constexpr BitsType step = UINT32_MAX / count;
70   for (BitsType i = 0, v = 0; i <= count; ++i, v += step) {
71     double x = valueFromBits(v);
72     if (isnan(x) || isinf(x))
73       continue;
74     ASSERT_MPFR_MATCH(mpfr::Operation::Trunc, x, __llvm_libc::truncf(x),
75                       tolerance);
76   }
77 }
78