1//===-- Unittests for sinpif ----------------------------------------------===//
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/libc_errno.h"
10#include "src/math/sinpif.h"
11#include "test/UnitTest/FPMatcher.h"
12#include "test/src/math/sdcomp26094.h"
13#include "utils/MPFRWrapper/MPFRUtils.h"
14
15#include <stdint.h>
16
17using LlvmLibcSinpifTest = LIBC_NAMESPACE::testing::FPTest<float>;
18
19using LIBC_NAMESPACE::testing::SDCOMP26094_VALUES;
20
21namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
22
23TEST_F(LlvmLibcSinpifTest, SpecialNumbers) {
24 libc_errno = 0;
25
26 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpif(aNaN));
27 EXPECT_MATH_ERRNO(0);
28
29 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::sinpif(0.0f));
30 EXPECT_MATH_ERRNO(0);
31
32 EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::sinpif(-0.0f));
33 EXPECT_MATH_ERRNO(0);
34
35 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpif(inf));
36 EXPECT_MATH_ERRNO(EDOM);
37
38 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpif(neg_inf));
39 EXPECT_MATH_ERRNO(EDOM);
40}
41
42TEST_F(LlvmLibcSinpifTest, SpecificBitPatterns) {
43 constexpr int N = 36;
44 constexpr uint32_t INPUTS[N] = {
45 0x3f06'0a92U, // x = pi/6
46 0x3f3a'dc51U, // x = 0x1.75b8a2p-1f
47 0x3f49'0fdbU, // x = pi/4
48 0x3f86'0a92U, // x = pi/3
49 0x3fa7'832aU, // x = 0x1.4f0654p+0f
50 0x3fc9'0fdbU, // x = pi/2
51 0x4017'1973U, // x = 0x1.2e32e6p+1f
52 0x4049'0fdbU, // x = pi
53 0x4096'cbe4U, // x = 0x1.2d97c8p+2f
54 0x40c9'0fdbU, // x = 2*pi
55 0x433b'7490U, // x = 0x1.76e92p+7f
56 0x437c'e5f1U, // x = 0x1.f9cbe2p+7f
57 0x4619'9998U, // x = 0x1.33333p+13f
58 0x474d'246fU, // x = 0x1.9a48dep+15f
59 0x4afd'ece4U, // x = 0x1.fbd9c8p+22f
60 0x4c23'32e9U, // x = 0x1.4665d2p+25f
61 0x50a3'e87fU, // x = 0x1.47d0fep+34f
62 0x5239'47f6U, // x = 0x1.728fecp+37f
63 0x53b1'46a6U, // x = 0x1.628d4cp+40f
64 0x55ca'fb2aU, // x = 0x1.95f654p+44f
65 0x588e'f060U, // x = 0x1.1de0cp+50f
66 0x5c07'bcd0U, // x = 0x1.0f79ap+57f
67 0x5ebc'fddeU, // x = 0x1.79fbbcp+62f
68 0x5fa6'eba7U, // x = 0x1.4dd74ep+64f
69 0x61a4'0b40U, // x = 0x1.48168p+68f
70 0x6386'134eU, // x = 0x1.0c269cp+72f
71 0x6589'8498U, // x = 0x1.13093p+76f
72 0x6600'0001U, // x = 0x1.000002p+77f
73 0x664e'46e4U, // x = 0x1.9c8dc8p+77f
74 0x66b0'14aaU, // x = 0x1.602954p+78f
75 0x67a9'242bU, // x = 0x1.524856p+80f
76 0x6a19'76f1U, // x = 0x1.32ede2p+85f
77 0x6c55'da58U, // x = 0x1.abb4bp+89f
78 0x6f79'be45U, // x = 0x1.f37c8ap+95f
79 0x7276'69d4U, // x = 0x1.ecd3a8p+101f
80 0x7758'4625U, // x = 0x1.b08c4ap+111f
81 };
82
83 for (int i = 0; i < N; ++i) {
84 float x = FPBits(INPUTS[i]).get_val();
85 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Sinpi, x,
86 LIBC_NAMESPACE::sinpif(x), 0.5);
87 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Sinpi, -x,
88 LIBC_NAMESPACE::sinpif(-x), 0.5);
89 }
90}
91
92// For small values, sinpi(x) is pi * x.
93TEST_F(LlvmLibcSinpifTest, SmallValues) {
94 float x = FPBits(0x1780'0000U).get_val();
95 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Sinpi, x,
96 LIBC_NAMESPACE::sinpif(x), 0.5);
97
98 x = FPBits(0x0040'0000U).get_val();
99 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Sinpi, x,
100 LIBC_NAMESPACE::sinpif(x), 0.5);
101}
102
103// SDCOMP-26094: check sinfpi in the cases for which the range reducer
104// returns values furthest beyond its nominal upper bound of pi/4.
105TEST_F(LlvmLibcSinpifTest, SDCOMP_26094) {
106 for (uint32_t v : SDCOMP26094_VALUES) {
107 float x = FPBits((v)).get_val();
108 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Sinpi, x,
109 LIBC_NAMESPACE::sinpif(x), 0.5);
110 }
111}
112
113// sinpi(-n) = -0.0
114// sinpi(+n) = +0.0
115TEST_F(LlvmLibcSinpifTest, SignedZeros) {
116 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x99));
117 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x1p+43));
118 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x1.4p+64));
119 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x1.cp+106));
120 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x1.cp+21));
121 EXPECT_FP_EQ(-0.0, LIBC_NAMESPACE::sinpif(-0x9999));
122 EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::sinpif(0x1p+43));
123 EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::sinpif(0x1.4p+64));
124 EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::sinpif(0x1.cp+106));
125 EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::sinpif(0x1.cp+21));
126}
127

source code of libc/test/src/math/sinpif_test.cpp