1 //===-- Unittests for sincosf ---------------------------------------------===//
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/__support/CPP/Array.h"
10 #include "src/__support/FPUtil/FPBits.h"
11 #include "src/math/sincosf.h"
12 #include "test/src/math/sdcomp26094.h"
13 #include "utils/MPFRWrapper/MPFRUtils.h"
14 #include "utils/UnitTest/FPMatcher.h"
15 #include "utils/UnitTest/Test.h"
16 #include <math.h>
17 
18 #include <errno.h>
19 #include <stdint.h>
20 
21 using __llvm_libc::testing::sdcomp26094Values;
22 using FPBits = __llvm_libc::fputil::FPBits<float>;
23 
24 namespace mpfr = __llvm_libc::testing::mpfr;
25 
26 DECLARE_SPECIAL_CONSTANTS(float)
27 
28 TEST(LlvmLibcSinCosfTest, SpecialNumbers) {
29   errno = 0;
30   float sin, cos;
31 
32   __llvm_libc::sincosf(aNaN, &sin, &cos);
33   EXPECT_FP_EQ(aNaN, cos);
34   EXPECT_FP_EQ(aNaN, sin);
35   EXPECT_EQ(errno, 0);
36 
37   __llvm_libc::sincosf(0.0f, &sin, &cos);
38   EXPECT_FP_EQ(1.0f, cos);
39   EXPECT_FP_EQ(0.0f, sin);
40   EXPECT_EQ(errno, 0);
41 
42   __llvm_libc::sincosf(-0.0f, &sin, &cos);
43   EXPECT_FP_EQ(1.0f, cos);
44   EXPECT_FP_EQ(-0.0f, sin);
45   EXPECT_EQ(errno, 0);
46 
47   errno = 0;
48   __llvm_libc::sincosf(inf, &sin, &cos);
49   EXPECT_FP_EQ(aNaN, cos);
50   EXPECT_FP_EQ(aNaN, sin);
51   EXPECT_EQ(errno, EDOM);
52 
53   errno = 0;
54   __llvm_libc::sincosf(negInf, &sin, &cos);
55   EXPECT_FP_EQ(aNaN, cos);
56   EXPECT_FP_EQ(aNaN, sin);
57   EXPECT_EQ(errno, EDOM);
58 }
59 
60 TEST(LlvmLibcSinCosfTest, InFloatRange) {
61   constexpr uint32_t count = 1000000;
62   constexpr uint32_t step = UINT32_MAX / count;
63   for (uint32_t i = 0, v = 0; i <= count; ++i, v += step) {
64     float x = float(FPBits((v)));
65     if (isnan(x) || isinf(x))
66       continue;
67 
68     float sin, cos;
69     __llvm_libc::sincosf(x, &sin, &cos);
70     ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, cos, 1.0);
71     ASSERT_MPFR_MATCH(mpfr::Operation::Sin, x, sin, 1.0);
72   }
73 }
74 
75 // For small values, cos(x) is 1 and sin(x) is x.
76 TEST(LlvmLibcSinCosfTest, SmallValues) {
77   uint32_t bits = 0x17800000;
78   float x = float(FPBits((bits)));
79   float result_cos, result_sin;
80   __llvm_libc::sincosf(x, &result_sin, &result_cos);
81   EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result_cos, 1.0);
82   EXPECT_MPFR_MATCH(mpfr::Operation::Sin, x, result_sin, 1.0);
83   EXPECT_FP_EQ(1.0f, result_cos);
84   EXPECT_FP_EQ(x, result_sin);
85 
86   bits = 0x00400000;
87   x = float(FPBits((bits)));
88   __llvm_libc::sincosf(x, &result_sin, &result_cos);
89   EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result_cos, 1.0);
90   EXPECT_MPFR_MATCH(mpfr::Operation::Sin, x, result_sin, 1.0);
91   EXPECT_FP_EQ(1.0f, result_cos);
92   EXPECT_FP_EQ(x, result_sin);
93 }
94 
95 // SDCOMP-26094: check sinf in the cases for which the range reducer
96 // returns values furthest beyond its nominal upper bound of pi/4.
97 TEST(LlvmLibcSinCosfTest, SDCOMP_26094) {
98   for (uint32_t v : sdcomp26094Values) {
99     float x = float(FPBits((v)));
100     float sin, cos;
101     __llvm_libc::sincosf(x, &sin, &cos);
102     EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, cos, 1.0);
103     EXPECT_MPFR_MATCH(mpfr::Operation::Sin, x, sin, 1.0);
104   }
105 }
106