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[libc][math] Refactor cosf16 implementation to header-only in src/__support/math folder. (#152871)

Browse Source 
Part of #147386

in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
This commit is contained in:
Muhammad Bassiouni 2025-08-13 18:04:35 +03:00 committed by GitHub
parent 4cdc3388b3
commit 0f6d3ad0fe
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
15 changed files with 217 additions and 129 deletions
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1
libc/shared/math.h
View File

@ -34,6 +34,7 @@
#include "math/cbrtf.h"
#include "math/cos.h"
#include "math/cosf.h"
#include "math/cosf16.h"
#include "math/erff.h"
#include "math/exp.h"
#include "math/exp10.h"

28
libc/shared/math/cosf16.h Normal file
View File

@ -0,0 +1,28 @@
//===-- Shared cosf16 function ----------------------------------*- 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_SHARED_MATH_COSF16_H
#define LLVM_LIBC_SHARED_MATH_COSF16_H
#include "shared/libc_common.h"
#ifdef LIBC_TYPES_HAS_FLOAT16
#include "src/__support/math/cosf16.h"
namespace LIBC_NAMESPACE_DECL {
namespace shared {
using math::cosf16;
} // namespace shared
} // namespace LIBC_NAMESPACE_DECL
#endif // LIBC_TYPES_HAS_FLOAT16
#endif // LLVM_LIBC_SHARED_MATH_COSF16_H

27
libc/src/__support/math/CMakeLists.txt
View File

@ -390,6 +390,23 @@ add_header_library(
libc.src.__support.macros.optimization
)
add_header_library(
cosf16
HDRS
cosf16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.except_value_utils
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.macros.properties.types
)
add_header_library(
erff
HDRS
@ -699,3 +716,13 @@ add_header_library(
libc.src.__support.FPUtil.polyeval
libc.src.__support.common
)
add_header_library(
sincosf16_utils
HDRS
sincosf16_utils.h
DEPENDS
libc.src.__support.FPUtil.polyeval
libc.src.__support.FPUtil.nearest_integer
libc.src.__support.common
)

106
libc/src/__support/math/cosf16.h Normal file
View File

@ -0,0 +1,106 @@
//===-- Implementation header for cosf16 ------------------------*- 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___SUPPORT_MATH_COSF16_H
#define LLVM_LIBC_SRC___SUPPORT_MATH_COSF16_H
#include "include/llvm-libc-macros/float16-macros.h"
#ifdef LIBC_TYPES_HAS_FLOAT16
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.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/macros/optimization.h"
namespace LIBC_NAMESPACE_DECL {
namespace math {
LIBC_INLINE static constexpr float16 cosf16(float16 x) {
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
constexpr size_t N_EXCEPTS = 4;
constexpr fputil::ExceptValues<float16, N_EXCEPTS> COSF16_EXCEPTS{{
// (input, RZ output, RU offset, RD offset, RN offset)
{0x2b7c, 0x3bfc, 1, 0, 1},
{0x4ac1, 0x38b5, 1, 0, 0},
{0x5c49, 0xb8c6, 0, 1, 0},
{0x7acc, 0xa474, 0, 1, 0},
}};
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
using namespace sincosf16_internal;
using FPBits = fputil::FPBits<float16>;
FPBits xbits(x);
uint16_t x_u = xbits.uintval();
uint16_t x_abs = x_u & 0x7fff;
float xf = x;
// Range reduction:
// For |x| > pi/32, we perform range reduction as follows:
// Find k and y such that:
// x = (k + y) * pi/32
// k is an integer, |y| < 0.5
//
// This is done by performing:
// k = round(x * 32/pi)
// y = x * 32/pi - k
//
// Once k and y are computed, we then deduce the answer by the cosine of sum
// formula:
// cos(x) = cos((k + y) * pi/32)
// = cos(k * pi/32) * cos(y * pi/32) -
// sin(k * pi/32) * sin(y * pi/32)
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
// Handle exceptional values
if (auto r = COSF16_EXCEPTS.lookup(x_abs); LIBC_UNLIKELY(r.has_value()))
return r.value();
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
// cos(+/-0) = 1
if (LIBC_UNLIKELY(x_abs == 0U))
return fputil::cast<float16>(1.0f);
// cos(+/-inf) = NaN, and cos(NaN) = NaN
if (xbits.is_inf_or_nan()) {
if (xbits.is_signaling_nan()) {
fputil::raise_except_if_required(FE_INVALID);
return FPBits::quiet_nan().get_val();
}
if (xbits.is_inf()) {
fputil::set_errno_if_required(EDOM);
fputil::raise_except_if_required(FE_INVALID);
}
return x + FPBits::quiet_nan().get_val();
}
float sin_k = 0.0f, cos_k = 0.0f, sin_y = 0.0f, cosm1_y = 0.0f;
sincosf16_eval(xf, sin_k, cos_k, sin_y, cosm1_y);
// Since, cosm1_y = cos_y - 1, therefore:
// cos(x) = cos_k * cos_y - sin_k * sin_y
// = cos_k * (cos_y - 1 + 1) - sin_k * sin_y
// = cos_k * cosm1_y - sin_k * sin_y + cos_k
return fputil::cast<float16>(fputil::multiply_add(
cos_k, cosm1_y, fputil::multiply_add(-sin_k, sin_y, cos_k)));
}
} // namespace math
} // namespace LIBC_NAMESPACE_DECL
#endif // LIBC_TYPES_HAS_FLOAT16
#endif // LLVM_LIBC_SRC___SUPPORT_MATH_COSF16_H

6
libc/src/math/generic/sincosf16_utils.h → libc/src/__support/math/sincosf16_utils.h
View File

@ -16,6 +16,8 @@
namespace LIBC_NAMESPACE_DECL {
namespace sincosf16_internal {
// Lookup table for sin(k * pi / 32) with k = 0, ..., 63.
// Table is generated with Sollya as follows:
// > display = hexadecimmal;
@ -66,7 +68,7 @@ LIBC_INLINE int32_t range_reduction_sincosf16(float x, float &y) {
return static_cast<int32_t>(kd);
}
static LIBC_INLINE void sincosf16_poly_eval(int32_t k, float y, float &sin_k,
LIBC_INLINE static void sincosf16_poly_eval(int32_t k, float y, float &sin_k,
float &cos_k, float &sin_y,
float &cosm1_y) {
@ -107,6 +109,8 @@ LIBC_INLINE void sincospif16_eval(float xf, float &sin_k, float &cos_k,
sincosf16_poly_eval(k, y, sin_k, cos_k, sin_y, cosm1_y);
}
} // namespace sincosf16_internal
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC_MATH_GENERIC_SINCOSF16_UTILS_H

31
libc/src/math/generic/CMakeLists.txt
View File

@ -278,16 +278,6 @@ add_entrypoint_object(
libc.src.__support.FPUtil.generic.add_sub
)
add_header_library(
sincosf16_utils
HDRS
sincosf16_utils.h
DEPENDS
libc.src.__support.FPUtil.polyeval
libc.src.__support.FPUtil.nearest_integer
libc.src.__support.common
)
add_entrypoint_object(
cos
SRCS
@ -315,16 +305,7 @@ add_entrypoint_object(
HDRS
../cosf16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.except_value_utils
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.macros.properties.types
libc.src.__support.math.cosf16
)
add_entrypoint_object(
@ -349,7 +330,6 @@ add_entrypoint_object(
HDRS
../cospif16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
@ -357,6 +337,7 @@ add_entrypoint_object(
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.math.sincosf16_utils
)
add_entrypoint_object(
@ -405,7 +386,6 @@ add_entrypoint_object(
HDRS
../sinf16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
@ -415,6 +395,7 @@ add_entrypoint_object(
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.macros.properties.types
libc.src.__support.math.sincosf16_utils
COMPILE_OPTIONS
${libc_opt_high_flag}
)
@ -482,7 +463,6 @@ add_entrypoint_object(
HDRS
../sinpif16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
@ -490,6 +470,7 @@ add_entrypoint_object(
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.math.sincosf16_utils
)
add_entrypoint_object(
@ -538,7 +519,6 @@ add_entrypoint_object(
HDRS
../tanf16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
@ -548,6 +528,7 @@ add_entrypoint_object(
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.macros.properties.types
libc.src.__support.math.sincosf16_utils
)
add_entrypoint_object(
@ -572,7 +553,6 @@ add_entrypoint_object(
HDRS
../tanpif16.h
DEPENDS
.sincosf16_utils
libc.hdr.errno_macros
libc.hdr.fenv_macros
libc.src.__support.FPUtil.cast
@ -581,6 +561,7 @@ add_entrypoint_object(
libc.src.__support.FPUtil.except_value_utils
libc.src.__support.FPUtil.multiply_add
libc.src.__support.macros.optimization
libc.src.__support.math.sincosf16_utils
)
add_entrypoint_object(

81
libc/src/math/generic/cosf16.cpp
View File

@ -7,87 +7,10 @@
//===----------------------------------------------------------------------===//
#include "src/math/cosf16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.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/macros/optimization.h"
#include "src/__support/math/cosf16.h"
namespace LIBC_NAMESPACE_DECL {
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
constexpr size_t N_EXCEPTS = 4;
constexpr fputil::ExceptValues<float16, N_EXCEPTS> COSF16_EXCEPTS{{
// (input, RZ output, RU offset, RD offset, RN offset)
{0x2b7c, 0x3bfc, 1, 0, 1},
{0x4ac1, 0x38b5, 1, 0, 0},
{0x5c49, 0xb8c6, 0, 1, 0},
{0x7acc, 0xa474, 0, 1, 0},
}};
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
LLVM_LIBC_FUNCTION(float16, cosf16, (float16 x)) {
using FPBits = fputil::FPBits<float16>;
FPBits xbits(x);
uint16_t x_u = xbits.uintval();
uint16_t x_abs = x_u & 0x7fff;
float xf = x;
// Range reduction:
// For |x| > pi/32, we perform range reduction as follows:
// Find k and y such that:
// x = (k + y) * pi/32
// k is an integer, |y| < 0.5
//
// This is done by performing:
// k = round(x * 32/pi)
// y = x * 32/pi - k
//
// Once k and y are computed, we then deduce the answer by the cosine of sum
// formula:
// cos(x) = cos((k + y) * pi/32)
// = cos(k * pi/32) * cos(y * pi/32) -
// sin(k * pi/32) * sin(y * pi/32)
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
// Handle exceptional values
if (auto r = COSF16_EXCEPTS.lookup(x_abs); LIBC_UNLIKELY(r.has_value()))
return r.value();
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
// cos(+/-0) = 1
if (LIBC_UNLIKELY(x_abs == 0U))
return fputil::cast<float16>(1.0f);
// cos(+/-inf) = NaN, and cos(NaN) = NaN
if (xbits.is_inf_or_nan()) {
if (xbits.is_signaling_nan()) {
fputil::raise_except_if_required(FE_INVALID);
return FPBits::quiet_nan().get_val();
}
if (xbits.is_inf()) {
fputil::set_errno_if_required(EDOM);
fputil::raise_except_if_required(FE_INVALID);
}
return x + FPBits::quiet_nan().get_val();
}
float sin_k, cos_k, sin_y, cosm1_y;
sincosf16_eval(xf, sin_k, cos_k, sin_y, cosm1_y);
// Since, cosm1_y = cos_y - 1, therefore:
// cos(x) = cos_k * cos_y - sin_k * sin_y
// = cos_k * (cos_y - 1 + 1) - sin_k * sin_y
// = cos_k * cosm1_y - sin_k * sin_y + cos_k
return fputil::cast<float16>(fputil::multiply_add(
cos_k, cosm1_y, fputil::multiply_add(-sin_k, sin_y, cos_k)));
}
LLVM_LIBC_FUNCTION(float16, cosf16, (float16 x)) { return math::cosf16(x); }
} // namespace LIBC_NAMESPACE_DECL

3
libc/src/math/generic/cospif16.cpp
View File

@ -9,16 +9,17 @@
#include "src/math/cospif16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/FPUtil/cast.h"
#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/macros/optimization.h"
#include "src/__support/math/sincosf16_utils.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(float16, cospif16, (float16 x)) {
using namespace sincosf16_internal;
using FPBits = typename fputil::FPBits<float16>;
FPBits xbits(x);

3
libc/src/math/generic/sinf16.cpp
View File

@ -9,13 +9,13 @@
#include "src/math/sinf16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.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/macros/optimization.h"
#include "src/__support/math/sincosf16_utils.h"
namespace LIBC_NAMESPACE_DECL {
@ -32,6 +32,7 @@ constexpr fputil::ExceptValues<float16, N_EXCEPTS> SINF16_EXCEPTS{{
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
LLVM_LIBC_FUNCTION(float16, sinf16, (float16 x)) {
using namespace sincosf16_internal;
using FPBits = fputil::FPBits<float16>;
FPBits xbits(x);

3
libc/src/math/generic/sinpif16.cpp
View File

@ -9,15 +9,16 @@
#include "src/math/sinpif16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/FPUtil/cast.h"
#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/math/sincosf16_utils.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(float16, sinpif16, (float16 x)) {
using namespace sincosf16_internal;
using FPBits = typename fputil::FPBits<float16>;
FPBits xbits(x);

3
libc/src/math/generic/tanf16.cpp
View File

@ -9,13 +9,13 @@
#include "src/math/tanf16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.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/macros/optimization.h"
#include "src/__support/math/sincosf16_utils.h"
namespace LIBC_NAMESPACE_DECL {
@ -37,6 +37,7 @@ constexpr fputil::ExceptValues<float16, N_EXCEPTS> TANF16_EXCEPTS{{
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
LLVM_LIBC_FUNCTION(float16, tanf16, (float16 x)) {
using namespace sincosf16_internal;
using FPBits = fputil::FPBits<float16>;
FPBits xbits(x);

3
libc/src/math/generic/tanpif16.cpp
View File

@ -9,13 +9,13 @@
#include "src/math/tanpif16.h"
#include "hdr/errno_macros.h"
#include "hdr/fenv_macros.h"
#include "sincosf16_utils.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.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/macros/optimization.h"
#include "src/__support/math/sincosf16_utils.h"
namespace LIBC_NAMESPACE_DECL {
@ -39,6 +39,7 @@ constexpr fputil::ExceptValues<float16, N_EXCEPTS> TANPIF16_EXCEPTS{{
#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
LLVM_LIBC_FUNCTION(float16, tanpif16, (float16 x)) {
using namespace sincosf16_internal;
using FPBits = typename fputil::FPBits<float16>;
FPBits xbits(x);

1
libc/test/shared/CMakeLists.txt
View File

@ -30,6 +30,7 @@ add_fp_unittest(
libc.src.__support.math.cbrtf
libc.src.__support.math.cos
libc.src.__support.math.cosf
libc.src.__support.math.cosf16
libc.src.__support.math.erff
libc.src.__support.math.exp
libc.src.__support.math.exp10

2
libc/test/shared/shared_math_test.cpp
View File

@ -21,7 +21,7 @@ TEST(LlvmLibcSharedMathTest, AllFloat16) {
EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::asinhf16(0.0f16));
EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::atanf16(0.0f16));
EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::atanhf16(0.0f16));
EXPECT_FP_EQ(0x1p+0f16, LIBC_NAMESPACE::shared::cosf16(0.0f16));
EXPECT_FP_EQ(0x1p+0f16, LIBC_NAMESPACE::shared::exp10f16(0.0f16));
EXPECT_FP_EQ(0x1p+0f16, LIBC_NAMESPACE::shared::expf16(0.0f16));

48
utils/bazel/llvm-project-overlay/libc/BUILD.bazel
View File

@ -1953,16 +1953,6 @@ libc_support_library(
],
)
libc_support_library(
name = "sincosf16_utils",
hdrs = ["src/math/generic/sincosf16_utils.h"],
deps = [
":__support_common",
":__support_fputil_nearest_integer",
":__support_fputil_polyeval",
],
)
libc_support_library(
name = "explogxf",
hdrs = ["src/math/generic/explogxf.h"],
@ -2390,6 +2380,20 @@ libc_support_library(
],
)
libc_support_library(
name = "__support_math_cosf16",
hdrs = ["src/__support/math/cosf16.h"],
deps = [
":__support_fputil_multiply_add",
":__support_fputil_fenv_impl",
":__support_fputil_cast",
":__support_fputil_except_value_utils",
":__support_macros_optimization",
":__support_math_sincosf16_utils",
":errno",
],
)
libc_support_library(
name = "__support_math_erff",
hdrs = ["src/__support/math/erff.h"],
@ -2704,6 +2708,16 @@ libc_support_library(
],
)
libc_support_library(
name = "__support_math_sincosf16_utils",
hdrs = ["src/__support/math/sincosf16_utils.h"],
deps = [
":__support_common",
":__support_fputil_nearest_integer",
":__support_fputil_polyeval",
],
)
############################### complex targets ################################
libc_function(
@ -3167,9 +3181,7 @@ libc_math_function(
libc_math_function(
name = "cosf16",
additional_deps = [
":__support_fputil_multiply_add",
":__support_macros_optimization",
":sincosf16_utils",
":__support_math_cosf16",
],
)
@ -3214,7 +3226,7 @@ libc_math_function(
additional_deps = [
":__support_fputil_multiply_add",
":__support_macros_optimization",
":sincosf16_utils",
":__support_math_sincosf16_utils",
],
)
@ -4292,7 +4304,7 @@ libc_math_function(
additional_deps = [
":__support_fputil_nearest_integer",
":__support_fputil_polyeval",
":sincosf16_utils",
":__support_math_sincosf16_utils",
],
)
@ -4352,7 +4364,7 @@ libc_math_function(
additional_deps = [
":__support_fputil_nearest_integer",
":__support_fputil_polyeval",
":sincosf16_utils",
":__support_math_sincosf16_utils",
],
)
@ -4421,7 +4433,7 @@ libc_math_function(
additional_deps = [
":__support_fputil_nearest_integer",
":__support_fputil_polyeval",
":sincosf16_utils",
":__support_math_sincosf16_utils",
],
)
@ -4461,7 +4473,7 @@ libc_math_function(
libc_math_function(
name = "tanpif16",
additional_deps = [
":sincosf16_utils",
":__support_math_sincosf16_utils",
":hdr_errno_macros",
":hdr_fenv_macros",
":__support_fputil_cast",