[libc-commits] [libc] eed9b4e - [libc][math][c23] Implement C23 math function asinpif16 (#146226)
via libc-commits
libc-commits at lists.llvm.org
Sat Jul 26 04:02:22 PDT 2025
Author: Mohamed Emad
Date: 2025-07-26T14:02:18+03:00
New Revision: eed9b4e05810381d8655f40fe298abb2f90a95cf
URL: https://github.com/llvm/llvm-project/commit/eed9b4e05810381d8655f40fe298abb2f90a95cf
DIFF: https://github.com/llvm/llvm-project/commit/eed9b4e05810381d8655f40fe298abb2f90a95cf.diff
LOG: [libc][math][c23] Implement C23 math function asinpif16 (#146226)
The function is implemented using the following Taylor series that's
generated using [python-sympy](https://www.sympy.org/en/index.html), and
it is very accurate for |x| $$\in [0, 0.5]$$ and has been verified using
Geogebra. The range reduction is used for the rest range (0.5, 1].
$$
\frac{\arcsin(x)}{\pi} \approx
\begin{aligned}[t]
& 0.318309886183791x \\
& + 0.0530516476972984x^3 \\
& + 0.0238732414637843x^5 \\
& + 0.0142102627760621x^7 \\
& + 0.00967087327815336x^9 \\
& + 0.00712127941391293x^{11} \\
& + 0.00552355646848375x^{13} \\
& + 0.00444514782463692x^{15} \\
& + 0.00367705242846804x^{17} \\
& + 0.00310721681820837x^{19} + O(x^{21})
\end{aligned}
$$
## Geogebra graph
Closes #132210
Added:
libc/src/math/asinpif16.h
libc/src/math/generic/asinpif16.cpp
libc/test/src/math/asinpif16_test.cpp
libc/test/src/math/smoke/asinpif16_test.cpp
Modified:
libc/config/linux/aarch64/entrypoints.txt
libc/config/linux/x86_64/entrypoints.txt
libc/docs/headers/math/index.rst
libc/include/math.yaml
libc/src/math/CMakeLists.txt
libc/src/math/generic/CMakeLists.txt
libc/test/src/math/CMakeLists.txt
libc/test/src/math/smoke/CMakeLists.txt
libc/utils/MPFRWrapper/MPCommon.cpp
libc/utils/MPFRWrapper/MPCommon.h
libc/utils/MPFRWrapper/MPFRUtils.cpp
libc/utils/MPFRWrapper/MPFRUtils.h
Removed:
################################################################################
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index b2abebee017d8..fe7e055fafbe2 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -660,6 +660,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
list(APPEND TARGET_LIBM_ENTRYPOINTS
# math.h C23 _Float16 entrypoints
# libc.src.math.acoshf16
+ libc.src.math.asinpif16
libc.src.math.canonicalizef16
libc.src.math.ceilf16
libc.src.math.copysignf16
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 5e8278e586286..0f5ec1ae444b3 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -703,6 +703,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
libc.src.math.acospif16
libc.src.math.asinf16
libc.src.math.asinhf16
+ libc.src.math.asinpif16
libc.src.math.atanf16
libc.src.math.atanhf16
libc.src.math.canonicalizef16
diff --git a/libc/docs/headers/math/index.rst b/libc/docs/headers/math/index.rst
index 9679c4a6c807f..5a309175b1556 100644
--- a/libc/docs/headers/math/index.rst
+++ b/libc/docs/headers/math/index.rst
@@ -259,7 +259,7 @@ Higher Math Functions
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
| asinh | |check| | | | |check| | | 7.12.5.2 | F.10.2.2 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| asinpi | | | | | | 7.12.4.9 | F.10.1.9 |
+| asinpi | | | | |check| | | 7.12.4.9 | F.10.1.9 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
| atan | |check| | 1 ULP | | |check| | | 7.12.4.3 | F.10.1.3 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
diff --git a/libc/include/math.yaml b/libc/include/math.yaml
index 007be235f4380..b3b91237eb0f9 100644
--- a/libc/include/math.yaml
+++ b/libc/include/math.yaml
@@ -79,6 +79,13 @@ functions:
arguments:
- type: _Float16
guard: LIBC_TYPES_HAS_FLOAT16
+ - name: asinpif16
+ standards:
+ - stdc
+ return_type: _Float16
+ arguments:
+ - type: _Float16
+ guard: LIBC_TYPES_HAS_FLOAT16
- name: atan
standards:
- stdc
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 455ad3456573a..fc064ab540d13 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -58,6 +58,8 @@ add_math_entrypoint_object(asinh)
add_math_entrypoint_object(asinhf)
add_math_entrypoint_object(asinhf16)
+add_math_entrypoint_object(asinpif16)
+
add_math_entrypoint_object(atan)
add_math_entrypoint_object(atanf)
add_math_entrypoint_object(atanf16)
diff --git a/libc/src/math/asinpif16.h b/libc/src/math/asinpif16.h
new file mode 100644
index 0000000000000..b97166af63f5d
--- /dev/null
+++ b/libc/src/math/asinpif16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for asinpif16 ---------------------*- C++ -*-===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_MATH_ASINPIF16_H
+#define LLVM_LIBC_SRC_MATH_ASINPIF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+float16 asinpif16(float16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_ASINPIF16_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index ecf09674b4d4c..8116ee29bc73f 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -3918,6 +3918,25 @@ add_entrypoint_object(
libc.src.__support.macros.properties.types
)
+add_entrypoint_object(
+ asinpif16
+ SRCS
+ asinpif16.cpp
+ HDRS
+ ../asinpif16.h
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.hdr.fenv_macros
+ libc.src.__support.FPUtil.cast
+ libc.src.__support.FPUtil.except_value_utils
+ libc.src.__support.FPUtil.fenv_impl
+ libc.src.__support.FPUtil.fp_bits
+ libc.src.__support.FPUtil.multiply_add
+ libc.src.__support.FPUtil.polyeval
+ libc.src.__support.FPUtil.sqrt
+ libc.src.__support.macros.optimization
+)
+
add_entrypoint_object(
atanhf
SRCS
diff --git a/libc/src/math/generic/asinpif16.cpp b/libc/src/math/generic/asinpif16.cpp
new file mode 100644
index 0000000000000..aabc0863ba527
--- /dev/null
+++ b/libc/src/math/generic/asinpif16.cpp
@@ -0,0 +1,127 @@
+//===-- Half-precision asinpif16(x) function ------------------------------===//
+//
+// 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/asinpif16.h"
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/except_value_utils.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(float16, asinpif16, (float16 x)) {
+ using FPBits = fputil::FPBits<float16>;
+
+ FPBits xbits(x);
+ bool is_neg = xbits.is_neg();
+ double x_abs = fputil::cast<double>(xbits.abs().get_val());
+
+ auto signed_result = [is_neg](auto r) -> auto { return is_neg ? -r : r; };
+
+ if (LIBC_UNLIKELY(x_abs > 1.0)) {
+ // aspinf16(NaN) = NaN
+ if (xbits.is_nan()) {
+ if (xbits.is_signaling_nan()) {
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
+ return x;
+ }
+
+ // 1 < |x| <= +/-inf
+ fputil::raise_except_if_required(FE_INVALID);
+ fputil::set_errno_if_required(EDOM);
+
+ return FPBits::quiet_nan().get_val();
+ }
+
+ // the coefficients for the polynomial approximation of asin(x)/pi in the
+ // range [0, 0.5] extracted using python-sympy
+ //
+ // Python code to generate the coefficients:
+ // > from sympy import *
+ // > import math
+ // > x = symbols('x')
+ // > print(series(asin(x)/math.pi, x, 0, 21))
+ //
+ // OUTPUT:
+ //
+ // 0.318309886183791*x + 0.0530516476972984*x**3 + 0.0238732414637843*x**5 +
+ // 0.0142102627760621*x**7 + 0.00967087327815336*x**9 +
+ // 0.00712127941391293*x**11 + 0.00552355646848375*x**13 +
+ // 0.00444514782463692*x**15 + 0.00367705242846804*x**17 +
+ // 0.00310721681820837*x**19 + O(x**21)
+ //
+ // it's very accurate in the range [0, 0.5] and has a maximum error of
+ // 0.0000000000000001 in the range [0, 0.5].
+ constexpr double POLY_COEFFS[] = {
+ 0x1.45f306dc9c889p-2, // x^1
+ 0x1.b2995e7b7b5fdp-5, // x^3
+ 0x1.8723a1d588a36p-6, // x^5
+ 0x1.d1a452f20430dp-7, // x^7
+ 0x1.3ce52a3a09f61p-7, // x^9
+ 0x1.d2b33e303d375p-8, // x^11
+ 0x1.69fde663c674fp-8, // x^13
+ 0x1.235134885f19bp-8, // x^15
+ };
+ // polynomial evaluation using horner's method
+ // work only for |x| in [0, 0.5]
+ auto asinpi_polyeval = [](double x) -> double {
+ return x * fputil::polyeval(x * x, POLY_COEFFS[0], POLY_COEFFS[1],
+ POLY_COEFFS[2], POLY_COEFFS[3], POLY_COEFFS[4],
+ POLY_COEFFS[5], POLY_COEFFS[6], POLY_COEFFS[7]);
+ };
+
+ // if |x| <= 0.5:
+ if (LIBC_UNLIKELY(x_abs <= 0.5)) {
+ // Use polynomial approximation of asin(x)/pi in the range [0, 0.5]
+ double result = asinpi_polyeval(fputil::cast<double>(x));
+ return fputil::cast<float16>(result);
+ }
+
+ // If |x| > 0.5, we need to use the range reduction method:
+ // y = asin(x) => x = sin(y)
+ // because: sin(a) = cos(pi/2 - a)
+ // therefore:
+ // x = cos(pi/2 - y)
+ // let z = pi/2 - y,
+ // x = cos(z)
+ // because: cos(2a) = 1 - 2 * sin^2(a), z = 2a, a = z/2
+ // therefore:
+ // cos(z) = 1 - 2 * sin^2(z/2)
+ // sin(z/2) = sqrt((1 - cos(z))/2)
+ // sin(z/2) = sqrt((1 - x)/2)
+ // let u = (1 - x)/2
+ // then:
+ // sin(z/2) = sqrt(u)
+ // z/2 = asin(sqrt(u))
+ // z = 2 * asin(sqrt(u))
+ // pi/2 - y = 2 * asin(sqrt(u))
+ // y = pi/2 - 2 * asin(sqrt(u))
+ // y/pi = 1/2 - 2 * asin(sqrt(u))/pi
+ //
+ // Finally, we can write:
+ // asinpi(x) = 1/2 - 2 * asinpi(sqrt(u))
+ // where u = (1 - x) /2
+ // = 0.5 - 0.5 * x
+ // = multiply_add(-0.5, x, 0.5)
+
+ double u = fputil::multiply_add(-0.5, x_abs, 0.5);
+ double asinpi_sqrt_u = asinpi_polyeval(fputil::sqrt<double>(u));
+ double result = fputil::multiply_add(-2.0, asinpi_sqrt_u, 0.5);
+
+ return fputil::cast<float16>(signed_result(result));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/src/math/CMakeLists.txt b/libc/test/src/math/CMakeLists.txt
index 43cde0d68873e..ea5816bd6e27e 100644
--- a/libc/test/src/math/CMakeLists.txt
+++ b/libc/test/src/math/CMakeLists.txt
@@ -2282,6 +2282,17 @@ add_fp_unittest(
libc.src.math.asinf16
)
+add_fp_unittest(
+ asinpif16_test
+ NEED_MPFR
+ SUITE
+ libc-math-unittests
+ SRCS
+ asinpif16_test.cpp
+ DEPENDS
+ libc.src.math.asinpif16
+)
+
add_fp_unittest(
acosf_test
NEED_MPFR
diff --git a/libc/test/src/math/asinpif16_test.cpp b/libc/test/src/math/asinpif16_test.cpp
new file mode 100644
index 0000000000000..3718f39fd06a6
--- /dev/null
+++ b/libc/test/src/math/asinpif16_test.cpp
@@ -0,0 +1,40 @@
+//===-- Exhaustive test for asinpif16 -------------------------------------===//
+//
+// 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/asinpif16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+using LlvmLibcAsinpif16Test = LIBC_NAMESPACE::testing::FPTest<float16>;
+
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+// Range: [0, Inf]
+static constexpr uint16_t POS_START = 0x0000U;
+static constexpr uint16_t POS_STOP = 0x7c00U;
+
+// Range: [-Inf, 0]
+static constexpr uint16_t NEG_START = 0x8000U;
+static constexpr uint16_t NEG_STOP = 0xfc00U;
+
+TEST_F(LlvmLibcAsinpif16Test, PositiveRange) {
+ for (uint16_t v = POS_START; v <= POS_STOP; ++v) {
+ float16 x = FPBits(v).get_val();
+ EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Asinpi, x,
+ LIBC_NAMESPACE::asinpif16(x), 0.5);
+ }
+}
+
+TEST_F(LlvmLibcAsinpif16Test, NegativeRange) {
+ for (uint16_t v = NEG_START; v <= NEG_STOP; ++v) {
+ float16 x = FPBits(v).get_val();
+ EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Asinpi, x,
+ LIBC_NAMESPACE::asinpif16(x), 0.5);
+ }
+}
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index ec4c09c5b70f7..8b54691f2cdf4 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -3988,6 +3988,18 @@ add_fp_unittest(
libc.src.math.asinhf16
)
+add_fp_unittest(
+ asinpif16_test
+ NEED_MPFR
+ SUITE
+ libc-math-unittests
+ SRCS
+ asinpif16_test.cpp
+ DEPENDS
+ libc.src.math.asinpif16
+ libc.src.errno.errno
+)
+
add_fp_unittest(
acoshf_test
SUITE
diff --git a/libc/test/src/math/smoke/asinpif16_test.cpp b/libc/test/src/math/smoke/asinpif16_test.cpp
new file mode 100644
index 0000000000000..5303eed8f5dae
--- /dev/null
+++ b/libc/test/src/math/smoke/asinpif16_test.cpp
@@ -0,0 +1,86 @@
+//===-- Unittests for asinpif16 -------------------------------------------===//
+//
+// 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/__support/libc_errno.h"
+#include "src/math/asinpif16.h"
+#include "test/UnitTest/FPMatcher.h"
+
+using LlvmLibcAsinpif16Test = LIBC_NAMESPACE::testing::FPTest<float16>;
+
+TEST_F(LlvmLibcAsinpif16Test, SpecialNumbers) {
+ // zero
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::asinpif16(zero));
+
+ // +/-1
+ EXPECT_FP_EQ(0.5f16, LIBC_NAMESPACE::asinpif16(1.0));
+ EXPECT_FP_EQ(-0.5f16, LIBC_NAMESPACE::asinpif16(-1.0));
+
+ // NaN inputs
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(FPBits::quiet_nan().get_val()));
+
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(FPBits::signaling_nan().get_val()));
+
+ // infinity inputs -> should return NaN
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(), LIBC_NAMESPACE::asinpif16(inf));
+ EXPECT_MATH_ERRNO(EDOM);
+
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(neg_inf));
+ EXPECT_MATH_ERRNO(EDOM);
+}
+
+TEST_F(LlvmLibcAsinpif16Test, OutOfRange) {
+ // Test values > 1
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(1.5f16));
+ EXPECT_MATH_ERRNO(EDOM);
+
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(2.0f16));
+ EXPECT_MATH_ERRNO(EDOM);
+
+ // Test values < -1
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(-1.5f16));
+ EXPECT_MATH_ERRNO(EDOM);
+
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(-2.0f16));
+ EXPECT_MATH_ERRNO(EDOM);
+
+ // Test maximum normal value (should be > 1 for float16)
+ libc_errno = 0;
+ EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+ LIBC_NAMESPACE::asinpif16(FPBits::max_normal().get_val()));
+ EXPECT_MATH_ERRNO(EDOM);
+}
+
+TEST_F(LlvmLibcAsinpif16Test, SymmetryProperty) {
+ // Test that asinpi(-x) = -asinpi(x)
+ constexpr float16 TEST_VALS[] = {0.1f16, 0.25f16, 0.5f16, 0.75f16,
+ 0.9f16, 0.99f16, 1.0f16};
+
+ for (float16 x : TEST_VALS) {
+ FPBits neg_x_bits(x);
+ neg_x_bits.set_sign(Sign::NEG);
+ float16 neg_x = neg_x_bits.get_val();
+
+ float16 pos_result = LIBC_NAMESPACE::asinpif16(x);
+ float16 neg_result = LIBC_NAMESPACE::asinpif16(neg_x);
+
+ EXPECT_FP_EQ(pos_result, FPBits(neg_result).abs().get_val());
+ }
+}
diff --git a/libc/utils/MPFRWrapper/MPCommon.cpp b/libc/utils/MPFRWrapper/MPCommon.cpp
index 07339a06fff80..fb6e6e8af71f8 100644
--- a/libc/utils/MPFRWrapper/MPCommon.cpp
+++ b/libc/utils/MPFRWrapper/MPCommon.cpp
@@ -105,6 +105,12 @@ MPFRNumber MPFRNumber::asinh() const {
return result;
}
+MPFRNumber MPFRNumber::asinpi() const {
+ MPFRNumber result(*this);
+ mpfr_asinpi(result.value, value, mpfr_rounding);
+ return result;
+}
+
MPFRNumber MPFRNumber::atan() const {
MPFRNumber result(*this);
mpfr_atan(result.value, value, mpfr_rounding);
diff --git a/libc/utils/MPFRWrapper/MPCommon.h b/libc/utils/MPFRWrapper/MPCommon.h
index 8bcc69c247a34..47d6293c06af4 100644
--- a/libc/utils/MPFRWrapper/MPCommon.h
+++ b/libc/utils/MPFRWrapper/MPCommon.h
@@ -189,6 +189,7 @@ class MPFRNumber {
MPFRNumber add(const MPFRNumber &b) const;
MPFRNumber asin() const;
MPFRNumber asinh() const;
+ MPFRNumber asinpi() const;
MPFRNumber atan() const;
MPFRNumber atan2(const MPFRNumber &b);
MPFRNumber atanh() const;
diff --git a/libc/utils/MPFRWrapper/MPFRUtils.cpp b/libc/utils/MPFRWrapper/MPFRUtils.cpp
index 8853f96ef8f92..c58aae75cc700 100644
--- a/libc/utils/MPFRWrapper/MPFRUtils.cpp
+++ b/libc/utils/MPFRWrapper/MPFRUtils.cpp
@@ -38,6 +38,8 @@ unary_operation(Operation op, InputType input, unsigned int precision,
return mpfrInput.asin();
case Operation::Asinh:
return mpfrInput.asinh();
+ case Operation::Asinpi:
+ return mpfrInput.asinpi();
case Operation::Atan:
return mpfrInput.atan();
case Operation::Atanh:
diff --git a/libc/utils/MPFRWrapper/MPFRUtils.h b/libc/utils/MPFRWrapper/MPFRUtils.h
index 45468c6cb19ae..e805607328f63 100644
--- a/libc/utils/MPFRWrapper/MPFRUtils.h
+++ b/libc/utils/MPFRWrapper/MPFRUtils.h
@@ -30,6 +30,7 @@ enum class Operation : int {
Acospi,
Asin,
Asinh,
+ Asinpi,
Atan,
Atanh,
Cbrt,
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