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[libc][math][c23] Add sqrtf16 C23 math function (#106102)
Part of #95250.
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14 files changed

+125
-2
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14 files changed

+125
-2
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‎libc/config/gpu/entrypoints.txt‎

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@@ -554,6 +554,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
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libc.src.math.setpayloadf16
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libc.src.math.setpayloadsigf16
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libc.src.math.sinhf16
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libc.src.math.sqrtf16
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libc.src.math.tanhf16
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libc.src.math.totalorderf16
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libc.src.math.totalordermagf16

‎libc/config/linux/aarch64/entrypoints.txt‎

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@@ -661,6 +661,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
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libc.src.math.scalbnf16
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libc.src.math.setpayloadf16
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libc.src.math.setpayloadsigf16
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libc.src.math.sqrtf16
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libc.src.math.totalorderf16
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libc.src.math.totalordermagf16
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libc.src.math.truncf16

‎libc/config/linux/x86_64/entrypoints.txt‎

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@@ -665,6 +665,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
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libc.src.math.setpayloadf16
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libc.src.math.setpayloadsigf16
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libc.src.math.sinhf16
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libc.src.math.sqrtf16
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libc.src.math.tanhf16
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libc.src.math.totalorderf16
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libc.src.math.totalordermagf16

‎libc/docs/math/index.rst‎

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@@ -340,7 +340,7 @@ Higher Math Functions
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| sinpi | |check| | | | | | 7.12.4.13 | F.10.1.13 |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| sqrt | |check| | |check| | |check| | | |check| | 7.12.7.10 | F.10.4.10 |
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| sqrt | |check| | |check| | |check| | |check| | |check| | 7.12.7.10 | F.10.4.10 |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| tan | |check| | |check| | | | | 7.12.4.7 | F.10.1.7 |
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+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

‎libc/spec/stdc.td‎

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@@ -668,6 +668,7 @@ def StdC : StandardSpec<"stdc"> {
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FunctionSpec<"sqrt", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
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FunctionSpec<"sqrtf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
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FunctionSpec<"sqrtl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
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GuardedFunctionSpec<"sqrtf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
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GuardedFunctionSpec<"sqrtf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
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FunctionSpec<"trunc", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,

‎libc/src/__support/FPUtil/generic/sqrt.h‎

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@@ -138,7 +138,8 @@ sqrt(InType x) {
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for (InStorageType current_bit = ONE >> 1; current_bit;
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current_bit >>= 1) {
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r <<= 1;
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InStorageType tmp = (y << 1) + current_bit; // 2*y(n - 1) + 2^(-n-1)
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// 2*y(n - 1) + 2^(-n-1)
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InStorageType tmp = static_cast<InStorageType>((y << 1) + current_bit);
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if (r >= tmp) {
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r -= tmp;
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y += current_bit;

‎libc/src/math/CMakeLists.txt‎

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@@ -479,6 +479,7 @@ add_math_entrypoint_object(sinhf16)
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add_math_entrypoint_object(sqrt)
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add_math_entrypoint_object(sqrtf)
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add_math_entrypoint_object(sqrtl)
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add_math_entrypoint_object(sqrtf16)
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add_math_entrypoint_object(sqrtf128)
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add_math_entrypoint_object(tan)

‎libc/src/math/generic/CMakeLists.txt‎

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@@ -3166,6 +3166,18 @@ add_entrypoint_object(
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-O3
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)
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add_entrypoint_object(
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sqrtf16
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SRCS
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sqrtf16.cpp
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HDRS
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../sqrtf16.h
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DEPENDS
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libc.src.__support.FPUtil.sqrt
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COMPILE_OPTIONS
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-O3
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)
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add_entrypoint_object(
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sqrtf128
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SRCS

‎libc/src/math/generic/sqrtf16.cpp‎

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//===-- Implementation of sqrtf16 function --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/math/sqrtf16.h"
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#include "src/__support/FPUtil/sqrt.h"
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#include "src/__support/common.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(float16, sqrtf16, (float16 x)) {
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return fputil::sqrt<float16>(x);
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}
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} // namespace LIBC_NAMESPACE_DECL

‎libc/src/math/sqrtf16.h‎

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//===-- Implementation header for sqrtf16 -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_MATH_SQRTF16_H
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#define LLVM_LIBC_SRC_MATH_SQRTF16_H
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#include "src/__support/macros/config.h"
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#include "src/__support/macros/properties/types.h"
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namespace LIBC_NAMESPACE_DECL {
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float16 sqrtf16(float16 x);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_MATH_SQRTF16_H

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