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[libc][math] Refactor acoshf implementation to header-only in src/__support/math folder.
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12 files changed

+350
-212
lines changed

12 files changed

+350
-212
lines changed

‎libc/shared/math.h

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -14,6 +14,7 @@
1414
#include "math/acos.h"
1515
#include "math/acosf.h"
1616
#include "math/acosf16.h"
17+
#include "math/acoshf.h"
1718
#include "math/erff.h"
1819
#include "math/exp.h"
1920
#include "math/exp10.h"

‎libc/shared/math/acoshf.h

Lines changed: 23 additions & 0 deletions
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@@ -0,0 +1,23 @@
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//===-- Shared acoshf function ----------------------------------*- C++ -*-===//
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+
#ifndef LLVM_LIBC_SHARED_MATH_ACOSHF_H
10+
#define LLVM_LIBC_SHARED_MATH_ACOSHF_H
11+
12+
#include "shared/libc_common.h"
13+
#include "src/__support/math/acoshf.h"
14+
15+
namespace LIBC_NAMESPACE_DECL {
16+
namespace shared {
17+
18+
using math::acoshf;
19+
20+
} // namespace shared
21+
} // namespace LIBC_NAMESPACE_DECL
22+
23+
#endif // LLVM_LIBC_SHARED_MATH_ACOSHF_H

‎libc/src/__support/math/CMakeLists.txt

Lines changed: 32 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -47,6 +47,38 @@ add_header_library(
4747
libc.src.__support.macros.properties.types
4848
)
4949

50+
add_header_library(
51+
acosh_float_constants
52+
HDRS
53+
acosh_float_constants.h
54+
DEPENDS
55+
libc.src.__support.macros.config
56+
)
57+
58+
add_header_library(
59+
acoshf_utils
60+
HDRS
61+
acoshf_utils.h
62+
DEPENDS
63+
.acosh_float_constants
64+
libc.src.__support.FPUtil.fp_bits
65+
libc.src.__support.FPUtil.multiply_add
66+
libc.src.__support.FPUtil.polyeval
67+
)
68+
69+
add_header_library(
70+
acoshf
71+
HDRS
72+
acoshf.h
73+
DEPENDS
74+
.acoshf_utils
75+
libc.src.__support.FPUtil.fenv_impl
76+
libc.src.__support.FPUtil.fp_bits
77+
libc.src.__support.FPUtil.multiply_add
78+
libc.src.__support.FPUtil.sqrt
79+
libc.src.__support.macros.optimization
80+
)
81+
5082
add_header_library(
5183
asin_utils
5284
HDRS

‎libc/src/__support/math/acosh_float_constants.h

Lines changed: 110 additions & 0 deletions
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@@ -0,0 +1,110 @@
1+
//===-- Common constants for acoshf function --------------------*- C++ -*-===//
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+
#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_ACOSH_FLOAT_CONSTANTS_H
10+
#define LLVM_LIBC_SRC___SUPPORT_MATH_ACOSH_FLOAT_CONSTANTS_H
11+
12+
#include "src/__support/macros/config.h"
13+
14+
namespace LIBC_NAMESPACE_DECL {
15+
16+
// Lookup table for (1/f) where f = 1 + n*2^(-7), n = 0..127.
17+
static const double ONE_OVER_F[128] = {
18+
0x1.0000000000000p+0, 0x1.fc07f01fc07f0p-1, 0x1.f81f81f81f820p-1,
19+
0x1.f44659e4a4271p-1, 0x1.f07c1f07c1f08p-1, 0x1.ecc07b301ecc0p-1,
20+
0x1.e9131abf0b767p-1, 0x1.e573ac901e574p-1, 0x1.e1e1e1e1e1e1ep-1,
21+
0x1.de5d6e3f8868ap-1, 0x1.dae6076b981dbp-1, 0x1.d77b654b82c34p-1,
22+
0x1.d41d41d41d41dp-1, 0x1.d0cb58f6ec074p-1, 0x1.cd85689039b0bp-1,
23+
0x1.ca4b3055ee191p-1, 0x1.c71c71c71c71cp-1, 0x1.c3f8f01c3f8f0p-1,
24+
0x1.c0e070381c0e0p-1, 0x1.bdd2b899406f7p-1, 0x1.bacf914c1bad0p-1,
25+
0x1.b7d6c3dda338bp-1, 0x1.b4e81b4e81b4fp-1, 0x1.b2036406c80d9p-1,
26+
0x1.af286bca1af28p-1, 0x1.ac5701ac5701bp-1, 0x1.a98ef606a63bep-1,
27+
0x1.a6d01a6d01a6dp-1, 0x1.a41a41a41a41ap-1, 0x1.a16d3f97a4b02p-1,
28+
0x1.9ec8e951033d9p-1, 0x1.9c2d14ee4a102p-1, 0x1.999999999999ap-1,
29+
0x1.970e4f80cb872p-1, 0x1.948b0fcd6e9e0p-1, 0x1.920fb49d0e229p-1,
30+
0x1.8f9c18f9c18fap-1, 0x1.8d3018d3018d3p-1, 0x1.8acb90f6bf3aap-1,
31+
0x1.886e5f0abb04ap-1, 0x1.8618618618618p-1, 0x1.83c977ab2beddp-1,
32+
0x1.8181818181818p-1, 0x1.7f405fd017f40p-1, 0x1.7d05f417d05f4p-1,
33+
0x1.7ad2208e0ecc3p-1, 0x1.78a4c8178a4c8p-1, 0x1.767dce434a9b1p-1,
34+
0x1.745d1745d1746p-1, 0x1.724287f46debcp-1, 0x1.702e05c0b8170p-1,
35+
0x1.6e1f76b4337c7p-1, 0x1.6c16c16c16c17p-1, 0x1.6a13cd1537290p-1,
36+
0x1.6816816816817p-1, 0x1.661ec6a5122f9p-1, 0x1.642c8590b2164p-1,
37+
0x1.623fa77016240p-1, 0x1.6058160581606p-1, 0x1.5e75bb8d015e7p-1,
38+
0x1.5c9882b931057p-1, 0x1.5ac056b015ac0p-1, 0x1.58ed2308158edp-1,
39+
0x1.571ed3c506b3ap-1, 0x1.5555555555555p-1, 0x1.5390948f40febp-1,
40+
0x1.51d07eae2f815p-1, 0x1.5015015015015p-1, 0x1.4e5e0a72f0539p-1,
41+
0x1.4cab88725af6ep-1, 0x1.4afd6a052bf5bp-1, 0x1.49539e3b2d067p-1,
42+
0x1.47ae147ae147bp-1, 0x1.460cbc7f5cf9ap-1, 0x1.446f86562d9fbp-1,
43+
0x1.42d6625d51f87p-1, 0x1.4141414141414p-1, 0x1.3fb013fb013fbp-1,
44+
0x1.3e22cbce4a902p-1, 0x1.3c995a47babe7p-1, 0x1.3b13b13b13b14p-1,
45+
0x1.3991c2c187f63p-1, 0x1.3813813813814p-1, 0x1.3698df3de0748p-1,
46+
0x1.3521cfb2b78c1p-1, 0x1.33ae45b57bcb2p-1, 0x1.323e34a2b10bfp-1,
47+
0x1.30d190130d190p-1, 0x1.2f684bda12f68p-1, 0x1.2e025c04b8097p-1,
48+
0x1.2c9fb4d812ca0p-1, 0x1.2b404ad012b40p-1, 0x1.29e4129e4129ep-1,
49+
0x1.288b01288b013p-1, 0x1.27350b8812735p-1, 0x1.25e22708092f1p-1,
50+
0x1.2492492492492p-1, 0x1.23456789abcdfp-1, 0x1.21fb78121fb78p-1,
51+
0x1.20b470c67c0d9p-1, 0x1.1f7047dc11f70p-1, 0x1.1e2ef3b3fb874p-1,
52+
0x1.1cf06ada2811dp-1, 0x1.1bb4a4046ed29p-1, 0x1.1a7b9611a7b96p-1,
53+
0x1.19453808ca29cp-1, 0x1.1811811811812p-1, 0x1.16e0689427379p-1,
54+
0x1.15b1e5f75270dp-1, 0x1.1485f0e0acd3bp-1, 0x1.135c81135c811p-1,
55+
0x1.12358e75d3033p-1, 0x1.1111111111111p-1, 0x1.0fef010fef011p-1,
56+
0x1.0ecf56be69c90p-1, 0x1.0db20a88f4696p-1, 0x1.0c9714fbcda3bp-1,
57+
0x1.0b7e6ec259dc8p-1, 0x1.0a6810a6810a7p-1, 0x1.0953f39010954p-1,
58+
0x1.0842108421084p-1, 0x1.073260a47f7c6p-1, 0x1.0624dd2f1a9fcp-1,
59+
0x1.05197f7d73404p-1, 0x1.0410410410410p-1, 0x1.03091b51f5e1ap-1,
60+
0x1.0204081020408p-1, 0x1.0101010101010p-1};
61+
62+
// Lookup table for log(f) = log(1 + n*2^(-7)) where n = 0..127.
63+
static constexpr double LOG_F[128] = {
64+
0x0.0000000000000p+0, 0x1.fe02a6b106788p-8, 0x1.fc0a8b0fc03e3p-7,
65+
0x1.7b91b07d5b11ap-6, 0x1.f829b0e783300p-6, 0x1.39e87b9febd5fp-5,
66+
0x1.77458f632dcfcp-5, 0x1.b42dd711971bep-5, 0x1.f0a30c01162a6p-5,
67+
0x1.16536eea37ae0p-4, 0x1.341d7961bd1d0p-4, 0x1.51b073f06183fp-4,
68+
0x1.6f0d28ae56b4bp-4, 0x1.8c345d6319b20p-4, 0x1.a926d3a4ad563p-4,
69+
0x1.c5e548f5bc743p-4, 0x1.e27076e2af2e5p-4, 0x1.fec9131dbeabap-4,
70+
0x1.0d77e7cd08e59p-3, 0x1.1b72ad52f67a0p-3, 0x1.29552f81ff523p-3,
71+
0x1.371fc201e8f74p-3, 0x1.44d2b6ccb7d1ep-3, 0x1.526e5e3a1b437p-3,
72+
0x1.5ff3070a793d3p-3, 0x1.6d60fe719d21cp-3, 0x1.7ab890210d909p-3,
73+
0x1.87fa06520c910p-3, 0x1.9525a9cf456b4p-3, 0x1.a23bc1fe2b563p-3,
74+
0x1.af3c94e80bff2p-3, 0x1.bc286742d8cd6p-3, 0x1.c8ff7c79a9a21p-3,
75+
0x1.d5c216b4fbb91p-3, 0x1.e27076e2af2e5p-3, 0x1.ef0adcbdc5936p-3,
76+
0x1.fb9186d5e3e2ap-3, 0x1.0402594b4d040p-2, 0x1.0a324e27390e3p-2,
77+
0x1.1058bf9ae4ad5p-2, 0x1.1675cababa60ep-2, 0x1.1c898c16999fap-2,
78+
0x1.22941fbcf7965p-2, 0x1.2895a13de86a3p-2, 0x1.2e8e2bae11d30p-2,
79+
0x1.347dd9a987d54p-2, 0x1.3a64c556945e9p-2, 0x1.404308686a7e3p-2,
80+
0x1.4618bc21c5ec2p-2, 0x1.4be5f957778a0p-2, 0x1.51aad872df82dp-2,
81+
0x1.5767717455a6cp-2, 0x1.5d1bdbf5809cap-2, 0x1.62c82f2b9c795p-2,
82+
0x1.686c81e9b14aep-2, 0x1.6e08eaa2ba1e3p-2, 0x1.739d7f6bbd006p-2,
83+
0x1.792a55fdd47a2p-2, 0x1.7eaf83b82afc3p-2, 0x1.842d1da1e8b17p-2,
84+
0x1.89a3386c1425ap-2, 0x1.8f11e873662c7p-2, 0x1.947941c2116fap-2,
85+
0x1.99d958117e08ap-2, 0x1.9f323ecbf984bp-2, 0x1.a484090e5bb0ap-2,
86+
0x1.a9cec9a9a0849p-2, 0x1.af1293247786bp-2, 0x1.b44f77bcc8f62p-2,
87+
0x1.b9858969310fbp-2, 0x1.beb4d9da71b7bp-2, 0x1.c3dd7a7cdad4dp-2,
88+
0x1.c8ff7c79a9a21p-2, 0x1.ce1af0b85f3ebp-2, 0x1.d32fe7e00ebd5p-2,
89+
0x1.d83e7258a2f3ep-2, 0x1.dd46a04c1c4a0p-2, 0x1.e24881a7c6c26p-2,
90+
0x1.e744261d68787p-2, 0x1.ec399d2468cc0p-2, 0x1.f128f5faf06ecp-2,
91+
0x1.f6123fa7028acp-2, 0x1.faf588f78f31ep-2, 0x1.ffd2e0857f498p-2,
92+
0x1.02552a5a5d0fep-1, 0x1.04bdf9da926d2p-1, 0x1.0723e5c1cdf40p-1,
93+
0x1.0986f4f573520p-1, 0x1.0be72e4252a82p-1, 0x1.0e44985d1cc8bp-1,
94+
0x1.109f39e2d4c96p-1, 0x1.12f719593efbcp-1, 0x1.154c3d2f4d5e9p-1,
95+
0x1.179eabbd899a0p-1, 0x1.19ee6b467c96ep-1, 0x1.1c3b81f713c24p-1,
96+
0x1.1e85f5e7040d0p-1, 0x1.20cdcd192ab6dp-1, 0x1.23130d7bebf42p-1,
97+
0x1.2555bce98f7cbp-1, 0x1.2795e1289b11ap-1, 0x1.29d37fec2b08ap-1,
98+
0x1.2c0e9ed448e8bp-1, 0x1.2e47436e40268p-1, 0x1.307d7334f10bep-1,
99+
0x1.32b1339121d71p-1, 0x1.34e289d9ce1d3p-1, 0x1.37117b54747b5p-1,
100+
0x1.393e0d3562a19p-1, 0x1.3b68449fffc22p-1, 0x1.3d9026a7156fap-1,
101+
0x1.3fb5b84d16f42p-1, 0x1.41d8fe84672aep-1, 0x1.43f9fe2f9ce67p-1,
102+
0x1.4618bc21c5ec2p-1, 0x1.48353d1ea88dfp-1, 0x1.4a4f85db03ebbp-1,
103+
0x1.4c679afccee39p-1, 0x1.4e7d811b75bb0p-1, 0x1.50913cc01686bp-1,
104+
0x1.52a2d265bc5aap-1, 0x1.54b2467999497p-1, 0x1.56bf9d5b3f399p-1,
105+
0x1.58cadb5cd7989p-1, 0x1.5ad404c359f2cp-1, 0x1.5cdb1dc6c1764p-1,
106+
0x1.5ee02a9241675p-1, 0x1.60e32f44788d8p-1};
107+
108+
} // namespace LIBC_NAMESPACE_DECL
109+
110+
#endif // LLVM_LIBC_SRC___SUPPORT_MATH_ACOSH_FLOAT_CONSTANTS_H

‎libc/src/__support/math/acoshf.h

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//===-- Implementation header for acoshf ------------------------*- C++ -*-===//
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+
#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_H
10+
#define LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_H
11+
12+
#include "acoshf_utils.h"
13+
#include "src/__support/FPUtil/FEnvImpl.h"
14+
#include "src/__support/FPUtil/FPBits.h"
15+
#include "src/__support/FPUtil/multiply_add.h"
16+
#include "src/__support/FPUtil/sqrt.h"
17+
#include "src/__support/macros/config.h"
18+
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
19+
20+
namespace LIBC_NAMESPACE_DECL {
21+
22+
namespace math {
23+
24+
static constexpr float acoshf(float x) {
25+
using FPBits_t = typename fputil::FPBits<float>;
26+
FPBits_t xbits(x);
27+
28+
if (LIBC_UNLIKELY(x <= 1.0f)) {
29+
if (x == 1.0f)
30+
return 0.0f;
31+
// x < 1.
32+
fputil::set_errno_if_required(EDOM);
33+
fputil::raise_except_if_required(FE_INVALID);
34+
return FPBits_t::quiet_nan().get_val();
35+
}
36+
37+
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
38+
uint32_t x_u = xbits.uintval();
39+
if (LIBC_UNLIKELY(x_u >= 0x4f8ffb03)) {
40+
if (LIBC_UNLIKELY(xbits.is_inf_or_nan()))
41+
return x;
42+
43+
// Helper functions to set results for exceptional cases.
44+
auto round_result_slightly_down = [](float r) -> float {
45+
volatile float tmp = r;
46+
tmp = tmp - 0x1.0p-25f;
47+
return tmp;
48+
};
49+
auto round_result_slightly_up = [](float r) -> float {
50+
volatile float tmp = r;
51+
tmp = tmp + 0x1.0p-25f;
52+
return tmp;
53+
};
54+
55+
switch (x_u) {
56+
case 0x4f8ffb03: // x = 0x1.1ff606p32f
57+
return round_result_slightly_up(0x1.6fdd34p4f);
58+
case 0x5c569e88: // x = 0x1.ad3d1p57f
59+
return round_result_slightly_up(0x1.45c146p5f);
60+
case 0x5e68984e: // x = 0x1.d1309cp61f
61+
return round_result_slightly_up(0x1.5c9442p5f);
62+
case 0x655890d3: // x = 0x1.b121a6p75f
63+
return round_result_slightly_down(0x1.a9a3f2p5f);
64+
case 0x6eb1a8ec: // x = 0x1.6351d8p94f
65+
return round_result_slightly_down(0x1.08b512p6f);
66+
case 0x7997f30a: // x = 0x1.2fe614p116f
67+
return round_result_slightly_up(0x1.451436p6f);
68+
}
69+
}
70+
#else
71+
if (LIBC_UNLIKELY(xbits.is_inf_or_nan()))
72+
return x;
73+
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
74+
75+
double x_d = static_cast<double>(x);
76+
// acosh(x) = log(x + sqrt(x^2 - 1))
77+
return static_cast<float>(log_eval(
78+
x_d + fputil::sqrt<double>(fputil::multiply_add(x_d, x_d, -1.0))));
79+
}
80+
81+
} // namespace math
82+
83+
} // namespace LIBC_NAMESPACE_DECL
84+
85+
#endif // LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_H

‎libc/src/__support/math/acoshf_utils.h

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1+
//===-- Collection of utils for acoshf --------------------------*- C++ -*-===//
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+
#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_UTILS_H
10+
#define LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_UTILS_H
11+
12+
#include "acosh_float_constants.h"
13+
#include "src/__support/FPUtil/FPBits.h"
14+
#include "src/__support/FPUtil/PolyEval.h"
15+
#include "src/__support/FPUtil/multiply_add.h"
16+
17+
namespace LIBC_NAMESPACE_DECL {
18+
19+
// x should be positive, normal finite value
20+
LIBC_INLINE static constexpr double log_eval(double x) {
21+
// For x = 2^ex * (1 + mx)
22+
// log(x) = ex * log(2) + log(1 + mx)
23+
using FPB = fputil::FPBits<double>;
24+
FPB bs(x);
25+
26+
double ex = static_cast<double>(bs.get_exponent());
27+
28+
// p1 is the leading 7 bits of mx, i.e.
29+
// p1 * 2^(-7) <= m_x < (p1 + 1) * 2^(-7).
30+
int p1 = static_cast<int>(bs.get_mantissa() >> (FPB::FRACTION_LEN - 7));
31+
32+
// Set bs to (1 + (mx - p1*2^(-7))
33+
bs.set_uintval(bs.uintval() & (FPB::FRACTION_MASK >> 7));
34+
bs.set_biased_exponent(FPB::EXP_BIAS);
35+
// dx = (mx - p1*2^(-7)) / (1 + p1*2^(-7)).
36+
double dx = (bs.get_val() - 1.0) * ONE_OVER_F[p1];
37+
38+
// Minimax polynomial of log(1 + dx) generated by Sollya with:
39+
// > P = fpminimax(log(1 + x)/x, 6, [|D...|], [0, 2^-7]);
40+
const double COEFFS[6] = {-0x1.ffffffffffffcp-2, 0x1.5555555552ddep-2,
41+
-0x1.ffffffefe562dp-3, 0x1.9999817d3a50fp-3,
42+
-0x1.554317b3f67a5p-3, 0x1.1dc5c45e09c18p-3};
43+
double dx2 = dx * dx;
44+
double c1 = fputil::multiply_add(dx, COEFFS[1], COEFFS[0]);
45+
double c2 = fputil::multiply_add(dx, COEFFS[3], COEFFS[2]);
46+
double c3 = fputil::multiply_add(dx, COEFFS[5], COEFFS[4]);
47+
48+
double p = fputil::polyeval(dx2, dx, c1, c2, c3);
49+
double result =
50+
fputil::multiply_add(ex, /*log(2)*/ 0x1.62e42fefa39efp-1, LOG_F[p1] + p);
51+
return result;
52+
}
53+
54+
} // namespace LIBC_NAMESPACE_DECL
55+
56+
#endif // LLVM_LIBC_SRC___SUPPORT_MATH_ACOSHF_UTILS_H

‎libc/src/math/generic/CMakeLists.txt

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1894,6 +1894,7 @@ add_object_library(
18941894
common_constants.cpp
18951895
DEPENDS
18961896
libc.src.__support.math.exp_constants
1897+
libc.src.__support.math.acosh_float_constants
18971898
libc.src.__support.number_pair
18981899
)
18991900

@@ -3759,7 +3760,7 @@ add_object_library(
37593760
DEPENDS
37603761
.common_constants
37613762
libc.src.__support.math.exp_utils
3762-
libc.src.__support.math.exp10f_utils
3763+
libc.src.__support.math.acoshf_utils
37633764
libc.src.__support.macros.properties.cpu_features
37643765
libc.src.errno.errno
37653766
)
@@ -3869,12 +3870,7 @@ add_entrypoint_object(
38693870
../acoshf.h
38703871
DEPENDS
38713872
.explogxf
3872-
libc.src.__support.FPUtil.fenv_impl
3873-
libc.src.__support.FPUtil.fp_bits
3874-
libc.src.__support.FPUtil.multiply_add
3875-
libc.src.__support.FPUtil.polyeval
3876-
libc.src.__support.FPUtil.sqrt
3877-
libc.src.__support.macros.optimization
3873+
libc.src.__support.math.acoshf
38783874
)
38793875

38803876
add_entrypoint_object(

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