[libc][math][c23] Add f16sqrtl C23 math function

Author: overmighty

libc/config/linux/aarch64/entrypoints.txt

@@ -511,6 +511,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.f16fmaf
     libc.src.math.f16sqrt
     libc.src.math.f16sqrtf
+    libc.src.math.f16sqrtl
     libc.src.math.fabsf16
     libc.src.math.fdimf16
     libc.src.math.floorf16

libc/config/linux/x86_64/entrypoints.txt

@@ -543,6 +543,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.f16fmal
     libc.src.math.f16sqrt
     libc.src.math.f16sqrtf
+    libc.src.math.f16sqrtl
     libc.src.math.fabsf16
     libc.src.math.fdimf16
     libc.src.math.floorf16

libc/docs/math/index.rst

@@ -292,7 +292,7 @@ Higher Math Functions
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fma       | |check|          | |check|         |                        |                      |                        | 7.12.13.1              | F.10.10.1                  |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| f16sqrt   | |check|          | |check|         |                        | N/A                  | |check|                | 7.12.14.6              | F.10.11                    |
+| f16sqrt   | |check|          | |check|         | |check|                | N/A                  | |check|                | 7.12.14.6              | F.10.11                    |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fsqrt     | N/A              |                 |                        | N/A                  |                        | 7.12.14.6              | F.10.11                    |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

libc/spec/stdc.td

@@ -733,6 +733,7 @@ def StdC : StandardSpec<"stdc"> {
 
           GuardedFunctionSpec<"f16sqrt", RetValSpec<Float16Type>, [ArgSpec<DoubleType>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"f16sqrtf", RetValSpec<Float16Type>, [ArgSpec<FloatType>], "LIBC_TYPES_HAS_FLOAT16">,
+          GuardedFunctionSpec<"f16sqrtl", RetValSpec<Float16Type>, [ArgSpec<LongDoubleType>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"f16sqrtf128", RetValSpec<Float16Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT16_AND_FLOAT128">,
       ]
   >;

libc/src/math/CMakeLists.txt

@@ -108,6 +108,7 @@ add_math_entrypoint_object(f16fmaf128)
 
 add_math_entrypoint_object(f16sqrt)
 add_math_entrypoint_object(f16sqrtf)
+add_math_entrypoint_object(f16sqrtl)
 add_math_entrypoint_object(f16sqrtf128)
 
 add_math_entrypoint_object(fabs)

libc/src/math/f16sqrtl.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for f16sqrtl ----------------------*- 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_F16SQRTL_H
+#define LLVM_LIBC_SRC_MATH_F16SQRTL_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 f16sqrtl(long double x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_F16SQRTL_H

libc/src/math/generic/CMakeLists.txt

@@ -3867,6 +3867,19 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  f16sqrtl
+  SRCS
+    f16sqrtl.cpp
+  HDRS
+    ../f16sqrtl.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.sqrt
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   f16sqrtf128
   SRCS

libc/src/math/generic/f16sqrtl.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of f16sqrtl 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/f16sqrtl.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, f16sqrtl, (long double x)) {
+  return fputil::sqrt<float16>(x);
+}
+
+} // namespace LIBC_NAMESPACE

libc/test/src/math/CMakeLists.txt

@@ -1936,6 +1936,19 @@ add_fp_unittest(
     libc.src.stdlib.srand
 )
 
+add_fp_unittest(
+  f16sqrtl_test
+  NEED_MPFR
+  SUITE
+    libc-math-unittests
+  SRCS
+    f16sqrtl_test.cpp
+  HDRS
+    SqrtTest.h
+  DEPENDS
+    libc.src.math.f16sqrtl
+)
+
 add_fp_unittest(
   f16fmaf_test
   NEED_MPFR

libc/test/src/math/f16sqrtl_test.cpp

@@ -0,0 +1,13 @@
+//===-- Unittests for f16sqrtl --------------------------------------------===//
+//
+// 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 "SqrtTest.h"
+
+#include "src/math/f16sqrtl.h"
+
+LIST_NARROWING_SQRT_TESTS(float16, long double, LIBC_NAMESPACE::f16sqrtl)