1 //===-- Unittests for fabsf -----------------------------------------------===//
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/fabsf.h"
11 #include "utils/FPUtil/FPBits.h"
12 #include "utils/FPUtil/TestHelpers.h"
13 #include "utils/MPFRWrapper/MPFRUtils.h"
14 #include "utils/UnitTest/Test.h"
15 
16 using FPBits = __llvm_libc::fputil::FPBits<float>;
17 
18 static const float zero = FPBits::zero();
19 static const float negZero = FPBits::negZero();
20 static const float nan = FPBits::buildNaN(1);
21 static const float inf = FPBits::inf();
22 static const float negInf = FPBits::negInf();
23 
24 namespace mpfr = __llvm_libc::testing::mpfr;
25 
26 TEST(FabsfTest, SpecialNumbers) {
27   EXPECT_FP_EQ(nan, __llvm_libc::fabsf(nan));
28 
29   EXPECT_FP_EQ(inf, __llvm_libc::fabsf(inf));
30   EXPECT_FP_EQ(inf, __llvm_libc::fabsf(negInf));
31 
32   EXPECT_FP_EQ(zero, __llvm_libc::fabsf(zero));
33   EXPECT_FP_EQ(zero, __llvm_libc::fabsf(negZero));
34 }
35 
36 TEST(FabsfTest, InFloatRange) {
37   using UIntType = FPBits::UIntType;
38   constexpr UIntType count = 1000000;
39   constexpr UIntType step = UIntType(-1) / count;
40   for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
41     float x = FPBits(v);
42     if (isnan(x) || isinf(x))
43       continue;
44     ASSERT_MPFR_MATCH(mpfr::Operation::Abs, x, __llvm_libc::fabsf(x), 0.0);
45   }
46 }
47