[libc][math][c23] Add llrintf16 C23 math function

Author: overmighty

libc/config/linux/aarch64/entrypoints.txt

@@ -502,6 +502,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.ceilf16
     libc.src.math.fabsf16
     libc.src.math.floorf16
+    libc.src.math.llrintf16
     libc.src.math.lrintf16
     libc.src.math.nearbyintf16
     libc.src.math.rintf16

libc/config/linux/x86_64/entrypoints.txt

@@ -535,6 +535,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.ceilf16
     libc.src.math.fabsf16
     libc.src.math.floorf16
+    libc.src.math.llrintf16
     libc.src.math.lrintf16
     libc.src.math.nearbyintf16
     libc.src.math.rintf16

libc/docs/math/index.rst

@@ -174,7 +174,7 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | llogb            | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.10              | F.10.3.10                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| llrint           | |check|          | |check|         | |check|                |                      | |check|                | 7.12.9.5               | F.10.6.5                   |
+| llrint           | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.5               | F.10.6.5                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | llround          | |check|          | |check|         | |check|                |                      | |check|                | 7.12.9.7               | F.10.6.7                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

libc/spec/stdc.td

@@ -601,6 +601,7 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"llrint", RetValSpec<LongLongType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"llrintf", RetValSpec<LongLongType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"llrintl", RetValSpec<LongLongType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"llrintf16", RetValSpec<LongLongType>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"llrintf128", RetValSpec<LongLongType>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"sqrt", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,

libc/src/math/CMakeLists.txt

@@ -225,6 +225,7 @@ add_math_entrypoint_object(logbf128)
 add_math_entrypoint_object(llrint)
 add_math_entrypoint_object(llrintf)
 add_math_entrypoint_object(llrintl)
+add_math_entrypoint_object(llrintf16)
 add_math_entrypoint_object(llrintf128)
 
 add_math_entrypoint_object(llround)

libc/src/math/generic/CMakeLists.txt

@@ -786,6 +786,19 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.nearest_integer_operations
 )
 
+add_entrypoint_object(
+  llrintf16
+  SRCS
+    llrintf16.cpp
+  HDRS
+    ../llrintf16.h
+  COMPILE_OPTIONS
+    -O3
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.nearest_integer_operations
+)
+
 add_entrypoint_object(
   llrintf128
   SRCS

libc/src/math/generic/llrintf16.cpp

@@ -0,0 +1,21 @@
+//===-- Implementation of llrintf16 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/llrintf16.h"
+#include "src/__support/FPUtil/NearestIntegerOperations.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(long long, llrintf16, (float16 x)) {
+  return fputil::round_to_signed_integer_using_current_rounding_mode<float128,
+                                                                     long long>(
+      x);
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/math/llrintf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for llrintf16 ---------------------*- 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_LLRINTF16_H
+#define LLVM_LIBC_SRC_MATH_LLRINTF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+long long llrintf16(float16 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_LLRINTF16_H

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

@@ -831,6 +831,21 @@ add_fp_unittest(
     libc.src.__support.FPUtil.fp_bits
 )
 
+add_fp_unittest(
+  llrintf16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    llrintf16_test.cpp
+  HDRS
+    RoundToIntegerTest.h
+  DEPENDS
+    libc.src.math.llrintf16
+    libc.src.__support.CPP.algorithm
+    libc.src.__support.FPUtil.fenv_impl
+    libc.src.__support.FPUtil.fp_bits
+)
+
 add_fp_unittest(
   llrintf128_test
   SUITE

libc/test/src/math/smoke/llrintf16_test.cpp

@@ -0,0 +1,14 @@
+//===-- Unittests for llrintf16 -------------------------------------------===//
+//
+// 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 "RoundToIntegerTest.h"
+
+#include "src/math/llrintf16.h"
+
+LIST_ROUND_TO_INTEGER_TESTS_WITH_MODES(float16, long long,
+                                       LIBC_NAMESPACE::llrintf16)