[libc][math][c++23] Add bf16{add,sub}{,f,l,f128} math functions

libc/config/linux/x86_64/entrypoints.txt

@@ -896,13 +896,27 @@ endif()
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
   libc.src.math.ceilbf16
+  libc.src.math.bf16add
+  libc.src.math.bf16addf
+  libc.src.math.bf16addl
+  libc.src.math.bf16sub
+  libc.src.math.bf16subf
+  libc.src.math.bf16subl
   libc.src.math.fabsbf16
   libc.src.math.floorbf16
   libc.src.math.roundbf16
   libc.src.math.roundevenbf16
   libc.src.math.truncbf16
 )
 
+if(LIBC_TYPES_HAS_FLOAT128)
+  list(APPEND TARGET_LIBM_ENTRYPOINTS
+    # math.h C++23 mixed bfloat16 and _Float128 entrypoints
+    libc.src.math.bf16addf128
+    libc.src.math.bf16subf128
+  )
+endif()
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints

libc/src/math/CMakeLists.txt

@@ -563,3 +563,13 @@ add_math_entrypoint_object(ufromfpxf)
 add_math_entrypoint_object(ufromfpxl)
 add_math_entrypoint_object(ufromfpxf16)
 add_math_entrypoint_object(ufromfpxf128)
+
+add_math_entrypoint_object(bf16add)
+add_math_entrypoint_object(bf16addf)
+add_math_entrypoint_object(bf16addl)
+add_math_entrypoint_object(bf16addf128)
+
+add_math_entrypoint_object(bf16sub)
+add_math_entrypoint_object(bf16subf)
+add_math_entrypoint_object(bf16subl)
+add_math_entrypoint_object(bf16subf128)

libc/src/math/bf16add.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16add -----------------------*- 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_BF16ADD_H
+#define LLVM_LIBC_SRC_MATH_BF16ADD_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16add(double x, double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16ADD_H

libc/src/math/bf16addf.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16addf ----------------------*- 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_BF16ADDF_H
+#define LLVM_LIBC_SRC_MATH_BF16ADDF_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16addf(float x, float y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16ADDF_H

libc/src/math/bf16addf128.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16addf128 -------------------*- 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_BF16ADDF128_H
+#define LLVM_LIBC_SRC_MATH_BF16ADDF128_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16addf128(float128 x, float128 y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16ADDF128_H

libc/src/math/bf16addl.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16addl ----------------------*- 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_BF16ADDL_H
+#define LLVM_LIBC_SRC_MATH_BF16ADDL_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16addl(long double x, long double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16ADDL_H

libc/src/math/bf16sub.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16sub -----------------------*- 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_BF16SUB_H
+#define LLVM_LIBC_SRC_MATH_BF16SUB_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16sub(double x, double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16SUB_H

libc/src/math/bf16subf.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16subf ----------------------*- 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_BF16SUBF_H
+#define LLVM_LIBC_SRC_MATH_BF16SUBF_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16subf(float x, float y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16SUBF_H

libc/src/math/bf16subf128.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16subf128 -------------------*- 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_BF16SUBF128_H
+#define LLVM_LIBC_SRC_MATH_BF16SUBF128_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16subf128(float128 x, float128 y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16SUBF128_H

libc/src/math/bf16subl.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for bf16subl ----------------------*- 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_BF16SUBL_H
+#define LLVM_LIBC_SRC_MATH_BF16SUBL_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 bf16subl(long double x, long double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_BF16SUBL_H

libc/src/math/generic/CMakeLists.txt

@@ -4911,3 +4911,116 @@ add_header_library(
     libc.src.__support.math.expf16_utils
     libc.src.__support.math.exp10_float16_constants
 )
+
+add_entrypoint_object(
+  bf16add
+  SRCS
+    bf16add.cpp
+  HDRS
+    ../bf16add.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16addf
+  SRCS
+    bf16addf.cpp
+  HDRS
+    ../bf16addf.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16addl
+  SRCS
+    bf16addl.cpp
+  HDRS
+    ../bf16addl.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16addf128
+  SRCS
+    bf16addf128.cpp
+  HDRS
+    ../bf16addf128.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+
+add_entrypoint_object(
+  bf16sub
+  SRCS
+    bf16sub.cpp
+  HDRS
+    ../bf16sub.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16subf
+  SRCS
+    bf16subf.cpp
+  HDRS
+    ../bf16subf.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16subl
+  SRCS
+    bf16subl.cpp
+  HDRS
+    ../bf16subl.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)
+
+add_entrypoint_object(
+  bf16subf128
+  SRCS
+    bf16subf128.cpp
+  HDRS
+    ../bf16subf128.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+)

libc/src/math/generic/bf16add.cpp

@@ -0,0 +1,21 @@
+//===-- Implementation of bf16add 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/bf16add.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, bf16add, (double x, double y)) {
+  return fputil::generic::add<bfloat16>(x, y);
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/src/math/generic/bf16addf.cpp

@@ -0,0 +1,21 @@
+//===-- Implementation of bf16addf 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/bf16addf.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, bf16addf, (float x, float y)) {
+  return fputil::generic::add<bfloat16>(x, y);
+}
+
+} // namespace LIBC_NAMESPACE_DECL