[libc][math][c23] Add {nextafter,nexttoward,nextup,nextdown}f16 C23 math functions

libc/config/linux/aarch64/entrypoints.txt

@@ -512,6 +512,10 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.lrintf16
     libc.src.math.lroundf16
     libc.src.math.nearbyintf16
+    libc.src.math.nextafterf16
+    libc.src.math.nextdownf16
+    libc.src.math.nexttowardf16
+    libc.src.math.nextupf16
     libc.src.math.rintf16
     libc.src.math.roundf16
     libc.src.math.roundevenf16

libc/config/linux/x86_64/entrypoints.txt

@@ -545,6 +545,10 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.lrintf16
     libc.src.math.lroundf16
     libc.src.math.nearbyintf16
+    libc.src.math.nextafterf16
+    libc.src.math.nextdownf16
+    libc.src.math.nexttowardf16
+    libc.src.math.nextupf16
     libc.src.math.rintf16
     libc.src.math.roundf16
     libc.src.math.roundevenf16

libc/docs/c23.rst

@@ -59,8 +59,8 @@ Additions:
   * ufromfp* |check|
   * fromfpx* |check|
   * ufromfpx* |check|
-  * nextup*
-  * nextdown*
+  * nextup* |check|
+  * nextdown* |check|
   * canonicalize* |check|
   * fmaximum*
   * fminimum*

libc/docs/math/index.rst

@@ -190,13 +190,13 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | nearbyint        | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.3               | F.10.6.3                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| nextafter        | |check|          | |check|         | |check|                |                      | |check|                | 7.12.11.3              | F.10.8.3                   |
+| nextafter        | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.11.3              | F.10.8.3                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| nextdown         | |check|          | |check|         | |check|                |                      | |check|                | 7.12.11.6              | F.10.8.6                   |
+| nextdown         | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.11.6              | F.10.8.6                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| nexttoward       | |check|          | |check|         | |check|                |                      | N/A                    | 7.12.11.4              | F.10.8.4                   |
+| nexttoward       | |check|          | |check|         | |check|                | |check|              | N/A                    | 7.12.11.4              | F.10.8.4                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| nextup           | |check|          | |check|         | |check|                |                      | |check|                | 7.12.11.5              | F.10.8.5                   |
+| nextup           | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.11.5              | F.10.8.5                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | remainder        | |check|          | |check|         | |check|                |                      |                        | 7.12.10.2              | F.10.7.2                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

libc/spec/stdc.td

@@ -632,20 +632,24 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"nextafterf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,
           FunctionSpec<"nextafter", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
           FunctionSpec<"nextafterl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"nextafterf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"nextafterf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"nexttowardf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<LongDoubleType>]>,
           FunctionSpec<"nexttoward", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<LongDoubleType>]>,
           FunctionSpec<"nexttowardl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"nexttowardf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
 
           FunctionSpec<"nextdown", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"nextdownf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"nextdownl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"nextdownf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"nextdownf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"nextup", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"nextupf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"nextupl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"nextupf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"nextupf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"powf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,

libc/src/math/CMakeLists.txt

@@ -270,20 +270,24 @@ add_math_entrypoint_object(nearbyintf128)
 add_math_entrypoint_object(nextafter)
 add_math_entrypoint_object(nextafterf)
 add_math_entrypoint_object(nextafterl)
+add_math_entrypoint_object(nextafterf16)
 add_math_entrypoint_object(nextafterf128)
 
 add_math_entrypoint_object(nexttoward)
 add_math_entrypoint_object(nexttowardf)
 add_math_entrypoint_object(nexttowardl)
+add_math_entrypoint_object(nexttowardf16)
 
 add_math_entrypoint_object(nextdown)
 add_math_entrypoint_object(nextdownf)
 add_math_entrypoint_object(nextdownl)
+add_math_entrypoint_object(nextdownf16)
 add_math_entrypoint_object(nextdownf128)
 
 add_math_entrypoint_object(nextup)
 add_math_entrypoint_object(nextupf)
 add_math_entrypoint_object(nextupl)
+add_math_entrypoint_object(nextupf16)
 add_math_entrypoint_object(nextupf128)
 
 add_math_entrypoint_object(pow)

libc/src/math/generic/CMakeLists.txt

@@ -2523,6 +2523,19 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  nextafterf16
+  SRCS
+    nextafterf16.cpp
+  HDRS
+    ../nextafterf16.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.manipulation_functions
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   nextafterf128
   SRCS
@@ -2572,6 +2585,19 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  nexttowardf16
+  SRCS
+    nexttowardf16.cpp
+  HDRS
+    ../nexttowardf16.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.manipulation_functions
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   nextdown
   SRCS
@@ -2608,6 +2634,19 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  nextdownf16
+  SRCS
+    nextdownf16.cpp
+  HDRS
+    ../nextdownf16.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.manipulation_functions
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   nextdownf128
   SRCS
@@ -2657,6 +2696,19 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  nextupf16
+  SRCS
+    nextupf16.cpp
+  HDRS
+    ../nextupf16.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.manipulation_functions
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   nextupf128
   SRCS

libc/src/math/generic/nextafterf16.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of nextafterf16 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/nextafterf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, nextafterf16, (float16 x, float16 y)) {
+  return fputil::nextafter(x, y);
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/math/generic/nextdownf16.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of nextdownf16 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/nextdownf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, nextdownf16, (float16 x)) {
+  return fputil::nextupdown</*IsDown=*/true>(x);
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/math/generic/nexttowardf16.cpp

@@ -0,0 +1,21 @@
+//===-- Implementation of nexttowardf16 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/nexttowardf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, nexttowardf16, (float16 x, long double y)) {
+  // We can reuse the nextafter implementation because the internal nextafter is
+  // templated on the types of the arguments.
+  return fputil::nextafter(x, y);
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/math/generic/nextupf16.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of nextupf16 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/nextupf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, nextupf16, (float16 x)) {
+  return fputil::nextupdown</*IsDown=*/false>(x);
+}
+
+} // namespace LIBC_NAMESPACE

libc/src/math/nextafterf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for nextafterf16 ------------------*- 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_NEXTAFTERF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTAFTERF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 nextafterf16(float16 x, float16 y);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTAFTERF16_H

libc/src/math/nextdownf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for nextdownf16 -------------------*- 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_NEXTDOWNF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTDOWNF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 nextdownf16(float16 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTDOWNF16_H

libc/src/math/nexttowardf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for nexttowardf16 -----------------*- 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_NEXTTOWARDF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTTOWARDF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 nexttowardf16(float16 x, long double y);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTTOWARDF16_H

libc/src/math/nextupf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for nextupf16 ---------------------*- 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_NEXTUPF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTUPF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 nextupf16(float16 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTUPF16_H