[libc][math][c23] Add f16sqrtf128 C23 math function

Author: overmighty

libc/config/linux/aarch64/entrypoints.txt

@@ -559,6 +559,13 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.ufromfpf16
     libc.src.math.ufromfpxf16
   )
+
+  if(LIBC_TYPES_HAS_FLOAT128)
+    list(APPEND TARGET_LIBM_ENTRYPOINTS
+      # math.h C23 mixed _Float16 and _Float128 entrypoints
+      libc.src.math.f16sqrtf128
+    )
+  endif()
 endif()
 
 if(LIBC_TYPES_HAS_FLOAT128)

libc/config/linux/x86_64/entrypoints.txt

@@ -588,6 +588,13 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.ufromfpf16
     libc.src.math.ufromfpxf16
   )
+
+  if(LIBC_TYPES_HAS_FLOAT128)
+    list(APPEND TARGET_LIBM_ENTRYPOINTS
+      # math.h C23 mixed _Float16 and _Float128 entrypoints
+      libc.src.math.f16sqrtf128
+    )
+  endif()
 endif()
 
 if(LIBC_TYPES_HAS_FLOAT128)

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                  |                        | 7.12.14.6              | F.10.11                    |
+| f16sqrt   | |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

@@ -730,6 +730,7 @@ 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<"f16sqrtf128", RetValSpec<Float16Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT16_AND_FLOAT128">,
       ]
   >;
 

libc/src/math/CMakeLists.txt

@@ -105,6 +105,7 @@ add_math_entrypoint_object(f16fmaf)
 
 add_math_entrypoint_object(f16sqrt)
 add_math_entrypoint_object(f16sqrtf)
+add_math_entrypoint_object(f16sqrtf128)
 
 add_math_entrypoint_object(fabs)
 add_math_entrypoint_object(fabsf)

libc/src/math/f16sqrtf128.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for f16sqrtf128 -------------------*- 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_F16SQRTF128_H
+#define LLVM_LIBC_SRC_MATH_F16SQRTF128_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 f16sqrtf128(float128 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_F16SQRTF128_H

libc/src/math/generic/CMakeLists.txt

@@ -3782,3 +3782,16 @@ add_entrypoint_object(
   COMPILE_OPTIONS
     -O3
 )
+
+add_entrypoint_object(
+  f16sqrtf128
+  SRCS
+    f16sqrtf128.cpp
+  HDRS
+    ../f16sqrtf128.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.sqrt
+  COMPILE_OPTIONS
+    -O3
+)

libc/src/math/generic/f16sqrtf128.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of f16sqrtf128 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/f16sqrtf128.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, f16sqrtf128, (float128 x)) {
+  return fputil::sqrt<float16>(x);
+}
+
+} // namespace LIBC_NAMESPACE

libc/test/src/math/smoke/CMakeLists.txt

@@ -3680,6 +3680,18 @@ add_fp_unittest(
     libc.src.math.f16sqrtf
 )
 
+add_fp_unittest(
+  f16sqrtf128_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    f16sqrtf128_test.cpp
+  HDRS
+    SqrtTest.h
+  DEPENDS
+    libc.src.math.f16sqrtf128
+)
+
 add_fp_unittest(
   sin_test
   SUITE

libc/test/src/math/smoke/f16sqrtf128_test.cpp

@@ -0,0 +1,13 @@
+//===-- Unittests for f16sqrtf128 -----------------------------------------===//
+//
+// 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/f16sqrtf128.h"
+
+LIST_NARROWING_SQRT_TESTS(float16, float128, LIBC_NAMESPACE::f16sqrtf128)