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 "src/math/trunc.h"
10 #include "utils/FPUtil/FPBits.h"
11 #include "utils/FPUtil/TestHelpers.h"
12 #include "utils/MPFRWrapper/MPFRUtils.h"
13 #include "utils/UnitTest/Test.h"
14 #include <math.h>
15
16 using FPBits = __llvm_libc::fputil::FPBits<double>;
17
18 namespace mpfr = __llvm_libc::testing::mpfr;
19
20 DECLARE_SPECIAL_CONSTANTS(double)
21
TEST(LlvmLibcTruncTest,SpecialNumbers)22 TEST(LlvmLibcTruncTest, SpecialNumbers) {
23 EXPECT_FP_EQ(zero, __llvm_libc::trunc(zero));
24 EXPECT_FP_EQ(negZero, __llvm_libc::trunc(negZero));
25
26 EXPECT_FP_EQ(inf, __llvm_libc::trunc(inf));
27 EXPECT_FP_EQ(negInf, __llvm_libc::trunc(negInf));
28
29 EXPECT_FP_EQ(aNaN, __llvm_libc::trunc(aNaN));
30 }
31
TEST(LlvmLibcTruncTest,RoundedNumbers)32 TEST(LlvmLibcTruncTest, RoundedNumbers) {
33 EXPECT_FP_EQ(1.0, __llvm_libc::trunc(1.0));
34 EXPECT_FP_EQ(-1.0, __llvm_libc::trunc(-1.0));
35 EXPECT_FP_EQ(10.0, __llvm_libc::trunc(10.0));
36 EXPECT_FP_EQ(-10.0, __llvm_libc::trunc(-10.0));
37 EXPECT_FP_EQ(1234.0, __llvm_libc::trunc(1234.0));
38 EXPECT_FP_EQ(-1234.0, __llvm_libc::trunc(-1234.0));
39 }
40
TEST(LlvmLibcTruncTest,Fractions)41 TEST(LlvmLibcTruncTest, Fractions) {
42 EXPECT_FP_EQ(0.0, __llvm_libc::trunc(0.5));
43 EXPECT_FP_EQ(-0.0, __llvm_libc::trunc(-0.5));
44 EXPECT_FP_EQ(0.0, __llvm_libc::trunc(0.115));
45 EXPECT_FP_EQ(-0.0, __llvm_libc::trunc(-0.115));
46 EXPECT_FP_EQ(0.0, __llvm_libc::trunc(0.715));
47 EXPECT_FP_EQ(-0.0, __llvm_libc::trunc(-0.715));
48 EXPECT_FP_EQ(1.0, __llvm_libc::trunc(1.3));
49 EXPECT_FP_EQ(-1.0, __llvm_libc::trunc(-1.3));
50 EXPECT_FP_EQ(1.0, __llvm_libc::trunc(1.5));
51 EXPECT_FP_EQ(-1.0, __llvm_libc::trunc(-1.5));
52 EXPECT_FP_EQ(1.0, __llvm_libc::trunc(1.75));
53 EXPECT_FP_EQ(-1.0, __llvm_libc::trunc(-1.75));
54 EXPECT_FP_EQ(10.0, __llvm_libc::trunc(10.32));
55 EXPECT_FP_EQ(-10.0, __llvm_libc::trunc(-10.32));
56 EXPECT_FP_EQ(10.0, __llvm_libc::trunc(10.65));
57 EXPECT_FP_EQ(-10.0, __llvm_libc::trunc(-10.65));
58 EXPECT_FP_EQ(1234.0, __llvm_libc::trunc(1234.38));
59 EXPECT_FP_EQ(-1234.0, __llvm_libc::trunc(-1234.38));
60 EXPECT_FP_EQ(1234.0, __llvm_libc::trunc(1234.96));
61 EXPECT_FP_EQ(-1234.0, __llvm_libc::trunc(-1234.96));
62 }
63
TEST(LlvmLibcTruncTest,InDoubleRange)64 TEST(LlvmLibcTruncTest, InDoubleRange) {
65 using UIntType = FPBits::UIntType;
66 constexpr UIntType count = 10000000;
67 constexpr UIntType step = UIntType(-1) / count;
68 for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
69 double x = FPBits(v);
70 if (isnan(x) || isinf(x))
71 continue;
72
73 ASSERT_MPFR_MATCH(mpfr::Operation::Trunc, x, __llvm_libc::trunc(x), 0.0);
74 }
75 }
76