1 //===-- Unittests for truncl ----------------------------------------------===//
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/truncl.h"
11 #include "utils/FPUtil/FPBits.h"
12 #include "utils/MPFRWrapper/MPFRUtils.h"
13 #include "utils/UnitTest/Test.h"
14 
15 using FPBits = __llvm_libc::fputil::FPBits<long double>;
16 
17 namespace mpfr = __llvm_libc::testing::mpfr;
18 
19 // Zero tolerance; As in, exact match with MPFR result.
20 static constexpr mpfr::Tolerance tolerance{mpfr::Tolerance::floatPrecision, 0,
21                                            0};
22 
23 TEST(TrunclTest, SpecialNumbers) {
24   ASSERT_TRUE(FPBits::zero() == __llvm_libc::truncl(FPBits::zero()));
25   ASSERT_TRUE(FPBits::negZero() == __llvm_libc::truncl(FPBits::negZero()));
26 
27   ASSERT_TRUE(FPBits::inf() == __llvm_libc::truncl(FPBits::inf()));
28   ASSERT_TRUE(FPBits::negInf() == __llvm_libc::truncl(FPBits::negInf()));
29 
30   long double nan = FPBits::buildNaN(1);
31   ASSERT_TRUE(isnan(nan) != 0);
32   ASSERT_TRUE(isnan(__llvm_libc::truncl(nan)) != 0);
33 }
34 
35 TEST(TrunclTest, RoundedNumbers) {
36   ASSERT_TRUE(FPBits(1.0l) == __llvm_libc::truncl(1.0l));
37   ASSERT_TRUE(FPBits(-1.0l) == __llvm_libc::truncl(-1.0l));
38   ASSERT_TRUE(FPBits(10.0l) == __llvm_libc::truncl(10.0l));
39   ASSERT_TRUE(FPBits(-10.0l) == __llvm_libc::truncl(-10.0l));
40   ASSERT_TRUE(FPBits(1234.0l) == __llvm_libc::truncl(1234.0l));
41   ASSERT_TRUE(FPBits(-1234.0l) == __llvm_libc::truncl(-1234.0l));
42 }
43 
44 TEST(TrunclTest, Fractions) {
45   ASSERT_TRUE(FPBits(1.0l) == __llvm_libc::truncl(1.5l));
46   ASSERT_TRUE(FPBits(-1.0l) == __llvm_libc::truncl(-1.75l));
47   ASSERT_TRUE(FPBits(10.0l) == __llvm_libc::truncl(10.32l));
48   ASSERT_TRUE(FPBits(-10.0l) == __llvm_libc::truncl(-10.65l));
49   ASSERT_TRUE(FPBits(1234.0l) == __llvm_libc::truncl(1234.78l));
50   ASSERT_TRUE(FPBits(-1234.0l) == __llvm_libc::truncl(-1234.96l));
51 }
52 
53 TEST(TrunclTest, InLongDoubleRange) {
54   using UIntType = FPBits::UIntType;
55   constexpr UIntType count = 10000000;
56   constexpr UIntType step = UIntType(-1) / count;
57   for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
58     long double x = FPBits(v);
59     if (isnan(x) || isinf(x))
60       continue;
61 
62     ASSERT_MPFR_MATCH(mpfr::Operation::Trunc, x, __llvm_libc::truncl(x),
63                       tolerance);
64   }
65 }
66