132 changes: 12 additions & 120 deletions libc/src/math/generic/sin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,9 @@
#include "hdr/errno_macros.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/FPUtil/PolyEval.h"
#include "src/__support/FPUtil/double_double.h"
#include "src/__support/FPUtil/dyadic_float.h"
#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/FPUtil/nearest_integer.h"
#include "src/__support/FPUtil/rounding_mode.h"
#include "src/__support/common.h"
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
Expand Down Expand Up @@ -56,88 +54,6 @@ namespace LIBC_NAMESPACE {
using DoubleDouble = fputil::DoubleDouble;
using Float128 = typename fputil::DyadicFloat<128>;

namespace {

#ifndef LIBC_MATH_SIN_SKIP_ACCURATE_PASS
LIBC_INLINE constexpr Float128 SIN_K_PI_OVER_128_F128[65] = {
{Sign::POS, 0, 0},
{Sign::POS, -133, 0xc90a'afbd'1b33'efc9'c539'edcb'fda0'cf2c_u128},
{Sign::POS, -132, 0xc8fb'2f88'6ec0'9f37'6a17'954b'2b7c'5171_u128},
{Sign::POS, -131, 0x96a9'0496'70cf'ae65'f775'7409'4d3c'35c4_u128},
{Sign::POS, -131, 0xc8bd'35e1'4da1'5f0e'c739'6c89'4bbf'7389_u128},
{Sign::POS, -131, 0xfab2'72b5'4b98'71a2'7047'29ae'56d7'8a37_u128},
{Sign::POS, -130, 0x9640'8374'7309'd113'000a'89a1'1e07'c1fe_u128},
{Sign::POS, -130, 0xaf10'a224'59fe'32a6'3fee'f3bb'58b1'f10d_u128},
{Sign::POS, -130, 0xc7c5'c1e3'4d30'55b2'5cc8'c00e'4fcc'd850_u128},
{Sign::POS, -130, 0xe05c'1353'f27b'17e5'0ebc'61ad'e6ca'83cd_u128},
{Sign::POS, -130, 0xf8cf'cbd9'0af8'd57a'4221'dc4b'a772'598d_u128},
{Sign::POS, -129, 0x888e'9315'8fb3'bb04'9841'56f5'5334'4306_u128},
{Sign::POS, -129, 0x94a0'3176'acf8'2d45'ae4b'a773'da6b'f754_u128},
{Sign::POS, -129, 0xa09a'e4a0'bb30'0a19'2f89'5f44'a303'cc0b_u128},
{Sign::POS, -129, 0xac7c'd3ad'58fe'e7f0'811f'9539'84ef'f83e_u128},
{Sign::POS, -129, 0xb844'2987'd22c'f576'9cc3'ef36'746d'e3b8_u128},
{Sign::POS, -129, 0xc3ef'1535'754b'168d'3122'c2a5'9efd'dc37_u128},
{Sign::POS, -129, 0xcf7b'ca1d'476c'516d'a812'90bd'baad'62e4_u128},
{Sign::POS, -129, 0xdae8'804f'0ae6'015b'362c'b974'182e'3030_u128},
{Sign::POS, -129, 0xe633'74c9'8e22'f0b4'2872'ce1b'fc7a'd1cd_u128},
{Sign::POS, -129, 0xf15a'e9c0'37b1'd8f0'6c48'e9e3'420b'0f1e_u128},
{Sign::POS, -129, 0xfc5d'26df'c4d5'cfda'27c0'7c91'1290'b8d1_u128},
{Sign::POS, -128, 0x839c'3cc9'17ff'6cb4'bfd7'9717'f288'0abf_u128},
{Sign::POS, -128, 0x88f5'9aa0'da59'1421'b892'ca83'61d8'c84c_u128},
{Sign::POS, -128, 0x8e39'd9cd'7346'4364'bba4'cfec'bff5'4867_u128},
{Sign::POS, -128, 0x9368'2a66'e896'f544'b178'2191'1e71'c16e_u128},
{Sign::POS, -128, 0x987f'bfe7'0b81'a708'19ce'c845'ac87'a5c6_u128},
{Sign::POS, -128, 0x9d7f'd149'0285'c9e3'e25e'3954'9638'ae68_u128},
{Sign::POS, -128, 0xa267'9928'48ee'b0c0'3b51'67ee'359a'234e_u128},
{Sign::POS, -128, 0xa736'55df'1f2f'489e'149f'6e75'9934'68a3_u128},
{Sign::POS, -128, 0xabeb'49a4'6764'fd15'1bec'da80'89c1'a94c_u128},
{Sign::POS, -128, 0xb085'baa8'e966'f6da'e4ca'd00d'5c94'bcd2_u128},
{Sign::POS, -128, 0xb504'f333'f9de'6484'597d'89b3'754a'be9f_u128},
{Sign::POS, -128, 0xb968'41bf'7ffc'b21a'9de1'e3b2'2b8b'f4db_u128},
{Sign::POS, -128, 0xbdae'f913'557d'76f0'ac85'320f'528d'6d5d_u128},
{Sign::POS, -128, 0xc1d8'705f'fcbb'6e90'bdf0'715c'b8b2'0bd7_u128},
{Sign::POS, -128, 0xc5e4'0358'a8ba'05a7'43da'25d9'9267'326b_u128},
{Sign::POS, -128, 0xc9d1'124c'931f'da7a'8335'241b'e169'3225_u128},
{Sign::POS, -128, 0xcd9f'023f'9c3a'059e'23af'31db'7179'a4aa_u128},
{Sign::POS, -128, 0xd14d'3d02'313c'0eed'744f'ea20'e8ab'ef92_u128},
{Sign::POS, -128, 0xd4db'3148'750d'1819'f630'e8b6'dac8'3e69_u128},
{Sign::POS, -128, 0xd848'52c0'a80f'fcdb'24b9'fe00'6635'74a4_u128},
{Sign::POS, -128, 0xdb94'1a28'cb71'ec87'2c19'b632'53da'43fc_u128},
{Sign::POS, -128, 0xdebe'0563'7ca9'4cfb'4b19'aa71'fec3'ae6d_u128},
{Sign::POS, -128, 0xe1c5'978c'05ed'8691'f4e8'a837'2f8c'5810_u128},
{Sign::POS, -128, 0xe4aa'5909'a08f'a7b4'1227'85ae'67f5'515d_u128},
{Sign::POS, -128, 0xe76b'd7a1'e63b'9786'1251'2952'9d48'a92f_u128},
{Sign::POS, -128, 0xea09'a68a'6e49'cd62'15ad'45b4'a1b5'e823_u128},
{Sign::POS, -128, 0xec83'5e79'946a'3145'7e61'0231'ac1d'6181_u128},
{Sign::POS, -128, 0xeed8'9db6'6611'e307'86f8'c20f'b664'b01b_u128},
{Sign::POS, -128, 0xf109'0827'b437'25fd'6712'7db3'5b28'7316_u128},
{Sign::POS, -128, 0xf314'4762'4708'8f74'a548'6bdc'455d'56a2_u128},
{Sign::POS, -128, 0xf4fa'0ab6'316e'd2ec'163c'5c7f'03b7'18c5_u128},
{Sign::POS, -128, 0xf6ba'073b'424b'19e8'2c79'1f59'cc1f'fc23_u128},
{Sign::POS, -128, 0xf853'f7dc'9186'b952'c7ad'c6b4'9888'91bb_u128},
{Sign::POS, -128, 0xf9c7'9d63'272c'4628'4504'ae08'd19b'2980_u128},
{Sign::POS, -128, 0xfb14'be7f'bae5'8156'2172'a361'fd2a'722f_u128},
{Sign::POS, -128, 0xfc3b'27d3'8a5d'49ab'2567'78ff'cb5c'1769_u128},
{Sign::POS, -128, 0xfd3a'abf8'4528'b50b'eae6'bd95'1c1d'abbe_u128},
{Sign::POS, -128, 0xfe13'2387'0cfe'9a3d'90cd'1d95'9db6'74ef_u128},
{Sign::POS, -128, 0xfec4'6d1e'8929'2cf0'4139'0efd'c726'e9ef_u128},
{Sign::POS, -128, 0xff4e'6d68'0c41'd0a9'0f66'8633'f1ab'858a_u128},
{Sign::POS, -128, 0xffb1'0f1b'cb6b'ef1d'421e'8eda'af59'453e_u128},
{Sign::POS, -128, 0xffec'4304'2668'65d9'5657'5523'6696'1732_u128},
{Sign::POS, 0, 1},
};

#ifdef LIBC_TARGET_CPU_HAS_FMA
constexpr double ERR = 0x1.0p-70;
#else
// TODO: Improve non-FMA fast pass accuracy.
constexpr double ERR = 0x1.0p-66;
#endif // LIBC_TARGET_CPU_HAS_FMA

#endif // !LIBC_MATH_SIN_SKIP_ACCURATE_PASS

} // anonymous namespace

LLVM_LIBC_FUNCTION(double, sin, (double x)) {
using FPBits = typename fputil::FPBits<double>;
FPBits xbits(x);
Expand Down Expand Up @@ -191,7 +107,7 @@ LLVM_LIBC_FUNCTION(double, sin, (double x)) {

DoubleDouble sin_y, cos_y;

sincos_eval(y, sin_y, cos_y);
generic::sincos_eval(y, sin_y, cos_y);

// Look up sin(k * pi/128) and cos(k * pi/128)
// Memory saving versions:
Expand Down Expand Up @@ -231,15 +147,21 @@ LLVM_LIBC_FUNCTION(double, sin, (double x)) {
DoubleDouble sin_k_cos_y = fputil::quick_mult<NO_FMA>(cos_y, sin_k);
DoubleDouble cos_k_sin_y = fputil::quick_mult<NO_FMA>(sin_y, cos_k);

FPBits sk_cy(sin_k_cos_y.hi);
FPBits ck_sy(cos_k_sin_y.hi);
DoubleDouble rr = fputil::exact_add<false>(sin_k_cos_y.hi, cos_k_sin_y.hi);
rr.lo += sin_k_cos_y.lo + cos_k_sin_y.lo;

#ifdef LIBC_MATH_SIN_SKIP_ACCURATE_PASS
return rr.hi + rr.lo;
#else
// Accurate test and pass for correctly rounded implementation.

#ifdef LIBC_TARGET_CPU_HAS_FMA
constexpr double ERR = 0x1.0p-70;
#else
// TODO: Improve non-FMA fast pass accuracy.
constexpr double ERR = 0x1.0p-66;
#endif // LIBC_TARGET_CPU_HAS_FMA

double rlp = rr.lo + ERR;
double rlm = rr.lo - ERR;

Expand All @@ -250,47 +172,17 @@ LLVM_LIBC_FUNCTION(double, sin, (double x)) {
if (LIBC_LIKELY(r_upper == r_lower))
return r_upper;

Float128 u_f128;
Float128 u_f128, sin_u, cos_u;
if (LIBC_LIKELY(x_e < FPBits::EXP_BIAS + FAST_PASS_EXPONENT))
u_f128 = generic::range_reduction_small_f128(x);
else
u_f128 = range_reduction_large.accurate();

Float128 u_sq = fputil::quick_mul(u_f128, u_f128);

// sin(u) ~ x - x^3/3! + x^5/5! - x^7/7! + x^9/9! - x^11/11! + x^13/13!
constexpr Float128 SIN_COEFFS[] = {
{Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1
{Sign::NEG, -130, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // -1/3!
{Sign::POS, -134, 0x88888888'88888888'88888888'88888889_u128}, // 1/5!
{Sign::NEG, -140, 0xd00d00d0'0d00d00d'00d00d00'd00d00d0_u128}, // -1/7!
{Sign::POS, -146, 0xb8ef1d2a'b6399c7d'560e4472'800b8ef2_u128}, // 1/9!
{Sign::NEG, -153, 0xd7322b3f'aa271c7f'3a3f25c1'bee38f10_u128}, // -1/11!
{Sign::POS, -160, 0xb092309d'43684be5'1c198e91'd7b4269e_u128}, // 1/13!
};

// cos(u) ~ 1 - x^2/2 + x^4/4! - x^6/6! + x^8/8! - x^10/10! + x^12/12!
constexpr Float128 COS_COEFFS[] = {
{Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
{Sign::NEG, -128, 0x80000000'00000000'00000000'00000000_u128}, // 1/2
{Sign::POS, -132, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // 1/4!
{Sign::NEG, -137, 0xb60b60b6'0b60b60b'60b60b60'b60b60b6_u128}, // 1/6!
{Sign::POS, -143, 0xd00d00d0'0d00d00d'00d00d00'd00d00d0_u128}, // 1/8!
{Sign::NEG, -149, 0x93f27dbb'c4fae397'780b69f5'333c725b_u128}, // 1/10!
{Sign::POS, -156, 0x8f76c77f'c6c4bdaa'26d4c3d6'7f425f60_u128}, // 1/12!
};

Float128 sin_u = fputil::quick_mul(
u_f128, fputil::polyeval(u_sq, SIN_COEFFS[0], SIN_COEFFS[1],
SIN_COEFFS[2], SIN_COEFFS[3], SIN_COEFFS[4],
SIN_COEFFS[5], SIN_COEFFS[6]));
Float128 cos_u = fputil::polyeval(u_sq, COS_COEFFS[0], COS_COEFFS[1],
COS_COEFFS[2], COS_COEFFS[3], COS_COEFFS[4],
COS_COEFFS[5], COS_COEFFS[6]);
generic::sincos_eval(u_f128, sin_u, cos_u);

auto get_sin_k = [](unsigned kk) -> Float128 {
unsigned idx = (kk & 64) ? 64 - (kk & 63) : (kk & 63);
Float128 ans = SIN_K_PI_OVER_128_F128[idx];
Float128 ans = generic::SIN_K_PI_OVER_128_F128[idx];
if (kk & 128)
ans.sign = Sign::NEG;
return ans;
Expand Down
43 changes: 43 additions & 0 deletions libc/src/math/generic/sincos_eval.h
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Original file line number Diff line number Diff line change
Expand Up @@ -9,12 +9,18 @@
#ifndef LLVM_LIBC_SRC_MATH_GENERIC_SINCOS_EVAL_H
#define LLVM_LIBC_SRC_MATH_GENERIC_SINCOS_EVAL_H

#include "src/__support/FPUtil/PolyEval.h"
#include "src/__support/FPUtil/double_double.h"
#include "src/__support/FPUtil/dyadic_float.h"
#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/integer_literals.h"

namespace LIBC_NAMESPACE {

namespace generic {

using fputil::DoubleDouble;
using Float128 = fputil::DyadicFloat<128>;

LIBC_INLINE void sincos_eval(const DoubleDouble &u, DoubleDouble &sin_u,
DoubleDouble &cos_u) {
Expand Down Expand Up @@ -76,6 +82,43 @@ LIBC_INLINE void sincos_eval(const DoubleDouble &u, DoubleDouble &sin_u,
cos_u = fputil::exact_add(v_hi, cos_lo);
}

LIBC_INLINE void sincos_eval(const Float128 &u, Float128 &sin_u,
Float128 &cos_u) {
Float128 u_sq = fputil::quick_mul(u, u);

// sin(u) ~ x - x^3/3! + x^5/5! - x^7/7! + x^9/9! - x^11/11! + x^13/13!
constexpr Float128 SIN_COEFFS[] = {
{Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1
{Sign::NEG, -130, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // -1/3!
{Sign::POS, -134, 0x88888888'88888888'88888888'88888889_u128}, // 1/5!
{Sign::NEG, -140, 0xd00d00d0'0d00d00d'00d00d00'd00d00d0_u128}, // -1/7!
{Sign::POS, -146, 0xb8ef1d2a'b6399c7d'560e4472'800b8ef2_u128}, // 1/9!
{Sign::NEG, -153, 0xd7322b3f'aa271c7f'3a3f25c1'bee38f10_u128}, // -1/11!
{Sign::POS, -160, 0xb092309d'43684be5'1c198e91'd7b4269e_u128}, // 1/13!
};

// cos(u) ~ 1 - x^2/2 + x^4/4! - x^6/6! + x^8/8! - x^10/10! + x^12/12!
constexpr Float128 COS_COEFFS[] = {
{Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
{Sign::NEG, -128, 0x80000000'00000000'00000000'00000000_u128}, // 1/2
{Sign::POS, -132, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // 1/4!
{Sign::NEG, -137, 0xb60b60b6'0b60b60b'60b60b60'b60b60b6_u128}, // 1/6!
{Sign::POS, -143, 0xd00d00d0'0d00d00d'00d00d00'd00d00d0_u128}, // 1/8!
{Sign::NEG, -149, 0x93f27dbb'c4fae397'780b69f5'333c725b_u128}, // 1/10!
{Sign::POS, -156, 0x8f76c77f'c6c4bdaa'26d4c3d6'7f425f60_u128}, // 1/12!
};

sin_u = fputil::quick_mul(u, fputil::polyeval(u_sq, SIN_COEFFS[0],
SIN_COEFFS[1], SIN_COEFFS[2],
SIN_COEFFS[3], SIN_COEFFS[4],
SIN_COEFFS[5], SIN_COEFFS[6]));
cos_u = fputil::polyeval(u_sq, COS_COEFFS[0], COS_COEFFS[1], COS_COEFFS[2],
COS_COEFFS[3], COS_COEFFS[4], COS_COEFFS[5],
COS_COEFFS[6]);
}

} // namespace generic

} // namespace LIBC_NAMESPACE

#endif // LLVM_LIBC_SRC_MATH_GENERIC_SINCOSF_EVAL_H
10 changes: 0 additions & 10 deletions libc/src/math/x86_64/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,13 +1,3 @@
add_entrypoint_object(
cos
SRCS
cos.cpp
HDRS
../cos.h
COMPILE_OPTIONS
-O2
)

add_entrypoint_object(
tan
SRCS
Expand Down
19 changes: 0 additions & 19 deletions libc/src/math/x86_64/cos.cpp
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This file was deleted.

123 changes: 110 additions & 13 deletions libc/test/src/math/cos_test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,27 +6,124 @@
//
//===----------------------------------------------------------------------===//

#include "src/__support/FPUtil/FPBits.h"
#include "src/math/cos.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"

#include "hdr/math_macros.h"

using LlvmLibcCosTest = LIBC_NAMESPACE::testing::FPTest<double>;

namespace mpfr = LIBC_NAMESPACE::testing::mpfr;

TEST_F(LlvmLibcCosTest, Range) {
static constexpr double _2pi = 6.283185307179586;
constexpr StorageType COUNT = 100'000;
constexpr StorageType STEP = STORAGE_MAX / COUNT;
for (StorageType i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
double x = FPBits(v).get_val();
// TODO: Expand the range of testing after range reduction is implemented.
if (isnan(x) || isinf(x) || x > _2pi || x < -_2pi)
continue;

ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, LIBC_NAMESPACE::cos(x), 1.0);
using LIBC_NAMESPACE::testing::tlog;

TEST_F(LlvmLibcCosTest, TrickyInputs) {
constexpr double INPUTS[] = {
0x1.8000000000009p-23, 0x1.8000000000024p-22,
0x1.800000000009p-21, 0x1.20000000000f3p-20,
0x1.800000000024p-20, 0x1.e0000000001c2p-20,
0x1.940c877fb7dacp-7, -0x1.f42fb19b5b9b2p-6,
-0x1.0285070f9f1bcp-5, 0x1.23f40dccdef72p+0,
0x1.43cf16358c9d7p+0, 0x1.addf3b9722265p+0,
0x1.ae78d360afa15p+0, 0x1.e31b55306f22cp+2,
0x1.e639103a05997p+2, -0x1.f7898d5a756ddp+2,
0x1.1685973506319p+3, 0x1.5f09cad750ab1p+3,
-0x1.aaf85537ea4c7p+3, 0x1.4f2b874135d27p+4,
0x1.13114266f9764p+4, 0x1.a211877de55dbp+4,
-0x1.a5eece87e8606p+4, 0x1.a65d441ea6dcep+4,
0x1.1ffb509f3db15p+5, 0x1.2345d1e090529p+5,
0x1.c96e28eb679f8p+5, 0x1.be886d9c2324dp+6,
-0x1.ab514bfc61c76p+7, -0x1.14823229799c2p+7,
0x1.48ff1782ca91dp+8, 0x1.dcbfda0c7559ep+8,
0x1.dcbfda0c7559ep+8, 0x1.2e566149bf5fdp+9,
0x1.cb996c60f437ep+9, 0x1.ae945054939c2p+10,
-0x1.119471e9216cdp+10, 0x1.ae945054939c2p+10,
0x1.fffffffffdb6p+24, 0x1.fd4da4ef37075p+29,
0x1.55202aefde314p+31, 0x1.b951f1572eba5p+31,
0x1.7776c2343ba4ep+101, 0x1.85fc0f04c0128p+101,
0x1.678309fa50d58p+110, 0x1.fffffffffef4ep+199,
0x1.3eec5912ea7cdp+331, -0x1.3eec5912ea7cdp+331,
-0x1.6deb37da81129p+205, 0x1.08087e9aad90bp+887,
-0x1.08087e9aad90bp+887, -0x1.8bb5847d49973p+845,
0x1.6ac5b262ca1ffp+849, 0x1.f08b14e1c4d0fp+890,
0x1.2b5fe88a9d8d5p+903, 0x1.f6d7518808571p+1023,
-0x1.a880417b7b119p+1023, 0x1.00a33764a0a83p-7,
0x1.fe81868fc47fep+1, 0x1.0da8cc189b47dp-10,
0x1.da1838053b866p+5,

};
constexpr int N = sizeof(INPUTS) / sizeof(INPUTS[0]);

for (int i = 0; i < N; ++i) {
double x = INPUTS[i];
ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Cos, x,
LIBC_NAMESPACE::cos(x), 0.5);
}
}

TEST_F(LlvmLibcCosTest, InDoubleRange) {
constexpr uint64_t COUNT = 1'234'51;
uint64_t START = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p-50).uintval();
uint64_t STOP = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p200).uintval();
uint64_t STEP = (STOP - START) / COUNT;

auto test = [&](mpfr::RoundingMode rounding_mode) {
mpfr::ForceRoundingMode __r(rounding_mode);
if (!__r.success)
return;

uint64_t fails = 0;
uint64_t tested = 0;
uint64_t total = 0;
double worst_input, worst_output = 0.0;
double ulp = 0.5;

for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
double x = FPBits(v).get_val();
if (isnan(x) || isinf(x))
continue;

double result = LIBC_NAMESPACE::cos(x);
++total;
if (isnan(result) || isinf(result))
continue;

++tested;

if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Cos, x, result,
0.5, rounding_mode)) {
++fails;
while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Cos, x,
result, ulp, rounding_mode)) {
worst_input = x;
worst_output = result;

if (ulp > 1000.0)
break;

ulp *= 2.0;
}
}
}
if (fails) {
tlog << " Cos failed: " << fails << "/" << tested << "/" << total
<< " tests.\n";
tlog << " Max ULPs is at most: " << static_cast<uint64_t>(ulp) << ".\n";
EXPECT_MPFR_MATCH(mpfr::Operation::Cos, worst_input, worst_output, 0.5,
rounding_mode);
}
};

tlog << " Test Rounding To Nearest...\n";
test(mpfr::RoundingMode::Nearest);

tlog << " Test Rounding Downward...\n";
test(mpfr::RoundingMode::Downward);

tlog << " Test Rounding Upward...\n";
test(mpfr::RoundingMode::Upward);

tlog << " Test Rounding Toward Zero...\n";
test(mpfr::RoundingMode::TowardZero);
}
10 changes: 10 additions & 0 deletions libc/test/src/math/smoke/CMakeLists.txt
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3677,3 +3677,13 @@ add_fp_unittest(
DEPENDS
libc.src.math.sin
)

add_fp_unittest(
cos_test
SUITE
libc-math-smoke-tests
SRCS
cos_test.cpp
DEPENDS
libc.src.math.cos
)
26 changes: 26 additions & 0 deletions libc/test/src/math/smoke/cos_test.cpp
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
//===-- Unittests for cos -------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/math/cos.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"

using LlvmLibcCosTest = LIBC_NAMESPACE::testing::FPTest<double>;

using LIBC_NAMESPACE::testing::tlog;

TEST_F(LlvmLibcCosTest, SpecialNumbers) {
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::cos(aNaN));
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::cos(inf));
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::cos(neg_inf));
EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::cos(zero));
EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::cos(neg_zero));
EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::cos(0x1.0p-50));
EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::cos(min_normal));
EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::cos(min_denormal));
}