[libc-commits] [libc] [libc][math][c++23] Add fabsbf16 math function (PR #148398)

Krishna Pandey via libc-commits libc-commits at lists.llvm.org
Wed Jul 23 07:55:39 PDT 2025 

https://github.com/krishna2803 updated https://github.com/llvm/llvm-project/pull/148398

>From e4135e32b39af9e7faa2c66df8f712aeeee5ef6b Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Wed, 4 Jun 2025 04:20:10 +0530
Subject: [PATCH 01/21] add: FPType::BFloat16

---
 .../llvm-libc-macros/bfloat16-macros.h        | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 libc/include/llvm-libc-macros/bfloat16-macros.h

diff --git a/libc/include/llvm-libc-macros/bfloat16-macros.h b/libc/include/llvm-libc-macros/bfloat16-macros.h
new file mode 100644
index 0000000000000..5b52f73efbadb
--- /dev/null
+++ b/libc/include/llvm-libc-macros/bfloat16-macros.h
@@ -0,0 +1,21 @@
+//===-- Detection of __bf16 compiler builtin type -------------------------===//
+//
+// 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_MACROS_BFLOAT16_MACROS_H
+#define LLVM_LIBC_MACROS_BFLOAT16_MACROS_H
+
+#if ((defined(__clang__) && __clang_major__ > 17) ||                           \
+     (defined(__GNUC__) && __GNUC__ > 13)) &&                                  \
+    !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&              \
+    !defined(_WIN32)
+
+#define LIBC_TYPES_HAS_BFLOAT16
+
+#endif // LIBC_TYPES_HAS_BFLOAT16
+
+#endif // LLVM_LIBC_MACROS_BFLOAT16_MACROS_H

>From 6cd97e43c0b7a1b64cc640f1e30eb8bf41898e9c Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Thu, 5 Jun 2025 05:02:18 +0530
Subject: [PATCH 02/21] chore: remove compiler version checks and add bfloat16
 to is_floating_type

---
 libc/include/llvm-libc-macros/bfloat16-macros.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/libc/include/llvm-libc-macros/bfloat16-macros.h b/libc/include/llvm-libc-macros/bfloat16-macros.h
index 5b52f73efbadb..466432b990a32 100644
--- a/libc/include/llvm-libc-macros/bfloat16-macros.h
+++ b/libc/include/llvm-libc-macros/bfloat16-macros.h
@@ -9,13 +9,15 @@
 #ifndef LLVM_LIBC_MACROS_BFLOAT16_MACROS_H
 #define LLVM_LIBC_MACROS_BFLOAT16_MACROS_H
 
-#if ((defined(__clang__) && __clang_major__ > 17) ||                           \
-     (defined(__GNUC__) && __GNUC__ > 13)) &&                                  \
-    !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&              \
-    !defined(_WIN32)
+// #if ((defined(__clang__) && __clang_major__ > 17) ||                        \
+//      (defined(__GNUC__) && __GNUC__ > 13)) &&                               \
+//     !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&           \
+//     !defined(_WIN32)
 
 #define LIBC_TYPES_HAS_BFLOAT16
 
-#endif // LIBC_TYPES_HAS_BFLOAT16
+struct BFloat16;
+
+// #endif // LIBC_TYPES_HAS_BFLOAT16
 
 #endif // LLVM_LIBC_MACROS_BFLOAT16_MACROS_H

>From 0ddfaedba0b16576c3f1935cc92118a9bcca7cee Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Thu, 5 Jun 2025 07:07:19 +0530
Subject: [PATCH 03/21] feat: update MPCommon.h for bfloat16 type and change
 __bf16 to our own type

---
 libc/utils/MPFRWrapper/MPCommon.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libc/utils/MPFRWrapper/MPCommon.h b/libc/utils/MPFRWrapper/MPCommon.h
index af03ff054e1a9..e19de5674d470 100644
--- a/libc/utils/MPFRWrapper/MPCommon.h
+++ b/libc/utils/MPFRWrapper/MPCommon.h
@@ -139,6 +139,19 @@ class MPFRNumber {
     mpfr_set_d(value, x, mpfr_rounding);
   }
 
+#ifdef LIBC_TYPES_HAS_BFLOAT16
+  template <typename XType,
+            cpp::enable_if_t<cpp::is_same_v<bfloat16, XType>, int> = 0>
+  explicit MPFRNumber(XType x,
+                      unsigned int precision = 8,
+                      RoundingMode rounding = RoundingMode::Nearest)
+      : mpfr_precision(precision),
+        mpfr_rounding(get_mpfr_rounding_mode(rounding)) {
+    mpfr_init2(value, mpfr_precision);
+    mpfr_set_flt(value, x.as_float(), mpfr_rounding);
+  }
+#endif
+
   template <typename XType,
             cpp::enable_if_t<cpp::is_same_v<long double, XType>, int> = 0>
   explicit MPFRNumber(XType x,

>From 7aac686f4500d75515b46d2170c4d902858cc32d Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Fri, 6 Jun 2025 12:50:34 +0530
Subject: [PATCH 04/21] feat: add BFloat16 checks in compiler features

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/cmake/modules/CheckCompilerFeatures.cmake          | 3 +++
 libc/cmake/modules/compiler_features/check_bfloat16.cpp | 5 +++++
 2 files changed, 8 insertions(+)
 create mode 100644 libc/cmake/modules/compiler_features/check_bfloat16.cpp

diff --git a/libc/cmake/modules/CheckCompilerFeatures.cmake b/libc/cmake/modules/CheckCompilerFeatures.cmake
index a5ea66a5935b7..6db69bd5c4895 100644
--- a/libc/cmake/modules/CheckCompilerFeatures.cmake
+++ b/libc/cmake/modules/CheckCompilerFeatures.cmake
@@ -15,6 +15,7 @@ set(
     "fixed_point"
     "cfloat16"
     "cfloat128"
+    "bfloat16"
 )
 
 # Making sure ALL_COMPILER_FEATURES is sorted.
@@ -116,6 +117,8 @@ foreach(feature IN LISTS ALL_COMPILER_FEATURES)
       set(LIBC_TYPES_HAS_CFLOAT16 TRUE)
     elseif(${feature} STREQUAL "cfloat128")
       set(LIBC_TYPES_HAS_CFLOAT128 TRUE)
+    elseif(${feature} STREQUAL "bfloat16")
+      set(LIBC_TYPES_HAS_BFLOAT16 TRUE)
     elseif(${feature} STREQUAL "builtin_ceil_floor_rint_trunc")
       set(LIBC_COMPILER_HAS_BUILTIN_CEIL_FLOOR_RINT_TRUNC TRUE)
     elseif(${feature} STREQUAL "builtin_fmax_fmin")
diff --git a/libc/cmake/modules/compiler_features/check_bfloat16.cpp b/libc/cmake/modules/compiler_features/check_bfloat16.cpp
new file mode 100644
index 0000000000000..1fcb73b01eb9c
--- /dev/null
+++ b/libc/cmake/modules/compiler_features/check_bfloat16.cpp
@@ -0,0 +1,5 @@
+#include "src/__support/macros/properties/types.h"
+
+#ifndef LIBC_TYPES_HAS_BFLOAT16
+#error unsupported
+#endif

>From e35655cffe94f021efda696d48c0ebaf84a7ff3e Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Mon, 9 Jun 2025 13:12:17 +0530
Subject: [PATCH 05/21] feat: add dummy bfloat16 -> float conversion function

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/src/math/fbfloat16.h            | 22 ++++++++++++++++++++++
 libc/src/math/generic/CMakeLists.txt | 14 ++++++++++++++
 libc/src/math/generic/fbfloat16.cpp  | 25 +++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 libc/src/math/fbfloat16.h
 create mode 100644 libc/src/math/generic/fbfloat16.cpp

diff --git a/libc/src/math/fbfloat16.h b/libc/src/math/fbfloat16.h
new file mode 100644
index 0000000000000..5b1b04b24a563
--- /dev/null
+++ b/libc/src/math/fbfloat16.h
@@ -0,0 +1,22 @@
+//===-- Implementation header for fbfloat16 ---------------------*- 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_FBFLOAT16_H
+#define LLVM_LIBC_SRC_MATH_FBFLOAT16_H
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+float fbfloat16(bfloat16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_FBFLOAT16_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index fd1e6c0d648aa..2802c82ad9607 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -5070,6 +5070,20 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.generic.mul
 )
 
+# Bfloat16 Functions
+
+add_entrypoint_object(
+  fbfloat16
+  SRCS
+    fbfloat16.cpp
+  HDRS
+    ../fbfloat16.h
+  DEPENDS
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.bfloat16
+)
+
 add_header_library(
   expxf16
   HDRS
diff --git a/libc/src/math/generic/fbfloat16.cpp b/libc/src/math/generic/fbfloat16.cpp
new file mode 100644
index 0000000000000..d42a486354e64
--- /dev/null
+++ b/libc/src/math/generic/fbfloat16.cpp
@@ -0,0 +1,25 @@
+//===-- Implementation of fbfloat16 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/fbfloat16.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(float, fbfloat16, (LIBC_NAMESPACE::bfloat16 x)) {
+  if (x.bits == 0)
+    return 0.0f;
+  else
+    return 1.0f;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

>From 79749034442e93444e4f69be4482829d5b18826f Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Mon, 9 Jun 2025 13:15:49 +0530
Subject: [PATCH 06/21] chore: add entrypoints for fbfloat16 function

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/config/linux/x86_64/entrypoints.txt | 7 +++++++
 libc/src/math/CMakeLists.txt             | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index edad30634b6da..df1922172c8ae 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -883,6 +883,13 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+if(LIBC_TYPES_HAS_BFLOAT16)
+  list(APPEND TARGET_LIBM_ENTRYPOINTS
+    # Bfloat16 Entrypoints
+    libc.src.math.fbfloat16
+  )
+endif()
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index b27b0d2b523f8..57b72d6e712f6 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -555,3 +555,6 @@ add_math_entrypoint_object(ufromfpxf)
 add_math_entrypoint_object(ufromfpxl)
 add_math_entrypoint_object(ufromfpxf16)
 add_math_entrypoint_object(ufromfpxf128)
+
+# BFloat16 functions
+add_math_entrypoint_object(fbfloat16)

>From 8aacba633f888bdbbfd556b60aa3f0c0fe47ce57 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Mon, 9 Jun 2025 18:32:40 +0530
Subject: [PATCH 07/21] chore: add dummy tests for fbfloat16

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/test/src/math/smoke/CMakeLists.txt     | 13 ++++++++++++
 libc/test/src/math/smoke/fbfloat16_test.cpp | 23 +++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 libc/test/src/math/smoke/fbfloat16_test.cpp

diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 599939cbec4b5..57fade182b128 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -5318,3 +5318,16 @@ add_fp_unittest(
     libc.src.__support.macros.properties.os
     libc.src.__support.macros.properties.types
 )
+
+# Bfloat16 Smoke Tests
+
+add_fp_unittest(
+  fbfloat16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    fbfloat16_test.cpp
+  DEPENDS
+    libc.src.errno.errno
+    libc.src.math.fbfloat16
+)
diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
new file mode 100644
index 0000000000000..8f52fe36aae61
--- /dev/null
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -0,0 +1,23 @@
+//===-- Unittests for fbfloat16 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/fbfloat16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+// TODO: change this to bfloat16
+using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<float>;
+
+TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
+  ASSERT_EQ(1, 2);
+  // TODO: implement this!
+  // x = some bfloat number
+  // float y = x as float (using our ctor?)
+  // float z = mfpr(x) as float
+  // check y == z
+}

>From 78a77f63062b6852f6ab6e525b834bcf2fc74133 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Mon, 9 Jun 2025 18:40:58 +0530
Subject: [PATCH 08/21] chore: update fbfloat16 dummy smoke tests

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/test/src/math/smoke/fbfloat16_test.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index 8f52fe36aae61..a63a7e05a8ba5 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/math/fbfloat16.h"
+
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -14,7 +15,14 @@
 using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<float>;
 
 TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
-  ASSERT_EQ(1, 2);
+
+  LIBC_NAMESPACE::bfloat16 x{0.0f};
+  ASSERT_EQ(0, static_cast<int>(x.bits));
+
+
+  LIBC_NAMESPACE::bfloat16 y{1.0f};
+  ASSERT_EQ(1, static_cast<int>(y.bits));
+
   // TODO: implement this!
   // x = some bfloat number
   // float y = x as float (using our ctor?)

>From ed3f8ac5f091d1ab11ea377414ef6c8a1686b87a Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Wed, 11 Jun 2025 20:20:44 +0530
Subject: [PATCH 09/21] fix: circular dependencies

---
 .../llvm-libc-macros/bfloat16-macros.h        | 23 -------------------
 libc/src/math/generic/fbfloat16.cpp           |  2 +-
 libc/test/src/math/smoke/CMakeLists.txt       |  1 -
 libc/test/src/math/smoke/fbfloat16_test.cpp   |  9 ++++----
 4 files changed, 6 insertions(+), 29 deletions(-)
 delete mode 100644 libc/include/llvm-libc-macros/bfloat16-macros.h

diff --git a/libc/include/llvm-libc-macros/bfloat16-macros.h b/libc/include/llvm-libc-macros/bfloat16-macros.h
deleted file mode 100644
index 466432b990a32..0000000000000
--- a/libc/include/llvm-libc-macros/bfloat16-macros.h
+++ /dev/null
@@ -1,23 +0,0 @@
-//===-- Detection of __bf16 compiler builtin type -------------------------===//
-//
-// 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_MACROS_BFLOAT16_MACROS_H
-#define LLVM_LIBC_MACROS_BFLOAT16_MACROS_H
-
-// #if ((defined(__clang__) && __clang_major__ > 17) ||                        \
-//      (defined(__GNUC__) && __GNUC__ > 13)) &&                               \
-//     !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&           \
-//     !defined(_WIN32)
-
-#define LIBC_TYPES_HAS_BFLOAT16
-
-struct BFloat16;
-
-// #endif // LIBC_TYPES_HAS_BFLOAT16
-
-#endif // LLVM_LIBC_MACROS_BFLOAT16_MACROS_H
diff --git a/libc/src/math/generic/fbfloat16.cpp b/libc/src/math/generic/fbfloat16.cpp
index d42a486354e64..1ef183668a51a 100644
--- a/libc/src/math/generic/fbfloat16.cpp
+++ b/libc/src/math/generic/fbfloat16.cpp
@@ -15,7 +15,7 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-LLVM_LIBC_FUNCTION(float, fbfloat16, (LIBC_NAMESPACE::bfloat16 x)) {
+LLVM_LIBC_FUNCTION(float, fbfloat16, (bfloat16 x)) {
   if (x.bits == 0)
     return 0.0f;
   else
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 57fade182b128..4dce1cad2cf58 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -5328,6 +5328,5 @@ add_fp_unittest(
   SRCS
     fbfloat16_test.cpp
   DEPENDS
-    libc.src.errno.errno
     libc.src.math.fbfloat16
 )
diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index a63a7e05a8ba5..2a7a2ea4fddf9 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -6,21 +6,22 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/math/fbfloat16.h"
+#include "src/__support/FPUtil/bfloat16.h"
 
+#include "src/math/fbfloat16.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 // TODO: change this to bfloat16
-using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<float>;
+using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
 
 TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
 
-  LIBC_NAMESPACE::bfloat16 x{0.0f};
+  bfloat16 x{0.0f};
   ASSERT_EQ(0, static_cast<int>(x.bits));
 
 
-  LIBC_NAMESPACE::bfloat16 y{1.0f};
+  bfloat16 y{1.0f};
   ASSERT_EQ(1, static_cast<int>(y.bits));
 
   // TODO: implement this!

>From e9e089b375ea56190729edd52743842b5ce6cd6a Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Mon, 9 Jun 2025 21:10:18 +0530
Subject: [PATCH 10/21] refactor: remove `LIBC_TYPES_HAS_BFLOAT16` dependency
 from sources and headers

---
 libc/cmake/modules/compiler_features/check_bfloat16.cpp | 6 +-----
 libc/test/src/math/smoke/fbfloat16_test.cpp             | 1 -
 libc/utils/MPFRWrapper/MPCommon.h                       | 2 --
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/libc/cmake/modules/compiler_features/check_bfloat16.cpp b/libc/cmake/modules/compiler_features/check_bfloat16.cpp
index 1fcb73b01eb9c..fac0b901ac594 100644
--- a/libc/cmake/modules/compiler_features/check_bfloat16.cpp
+++ b/libc/cmake/modules/compiler_features/check_bfloat16.cpp
@@ -1,5 +1 @@
-#include "src/__support/macros/properties/types.h"
-
-#ifndef LIBC_TYPES_HAS_BFLOAT16
-#error unsupported
-#endif
+// intentionally left empty for CheckCompilerFeatures to work.
diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index 2a7a2ea4fddf9..723922746eae2 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -12,7 +12,6 @@
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-// TODO: change this to bfloat16
 using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
 
 TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
diff --git a/libc/utils/MPFRWrapper/MPCommon.h b/libc/utils/MPFRWrapper/MPCommon.h
index e19de5674d470..0cabb63439927 100644
--- a/libc/utils/MPFRWrapper/MPCommon.h
+++ b/libc/utils/MPFRWrapper/MPCommon.h
@@ -139,7 +139,6 @@ class MPFRNumber {
     mpfr_set_d(value, x, mpfr_rounding);
   }
 
-#ifdef LIBC_TYPES_HAS_BFLOAT16
   template <typename XType,
             cpp::enable_if_t<cpp::is_same_v<bfloat16, XType>, int> = 0>
   explicit MPFRNumber(XType x,
@@ -150,7 +149,6 @@ class MPFRNumber {
     mpfr_init2(value, mpfr_precision);
     mpfr_set_flt(value, x.as_float(), mpfr_rounding);
   }
-#endif
 
   template <typename XType,
             cpp::enable_if_t<cpp::is_same_v<long double, XType>, int> = 0>

>From 8ded7ba17990096cfb27fb30e6dd90edb31729f0 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Thu, 12 Jun 2025 22:34:15 +0530
Subject: [PATCH 11/21] chore: complete smoke tests for fbfloat16 function

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/test/src/math/smoke/fbfloat16_test.cpp | 25 ++++++++++-----------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index 723922746eae2..06624fbfd33d0 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -15,17 +15,16 @@
 using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
 
 TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
-
-  bfloat16 x{0.0f};
-  ASSERT_EQ(0, static_cast<int>(x.bits));
-
-
-  bfloat16 y{1.0f};
-  ASSERT_EQ(1, static_cast<int>(y.bits));
-
-  // TODO: implement this!
-  // x = some bfloat number
-  // float y = x as float (using our ctor?)
-  // float z = mfpr(x) as float
-  // check y == z
+  constexpr float SPECIAL_FLOATS[] = {
+    0.0f, 1.0f, 2.0f, 4.5f, -1.0f, -0.5f, 3.140625f
+  };
+
+  constexpr uint16_t SPECIAL_BFLOAT16_BITS[] = {
+    0, 0x3f80U, 0x4000U, 0x4090U, 0xbf80U, 0xbf00, 0x4049U
+  };
+
+  for (int i=0; i<7; i++) {
+    bfloat16 x{SPECIAL_FLOATS[i]};
+    ASSERT_EQ(SPECIAL_BFLOAT16_BITS[i], x.bits);
+  }
 }

>From 823d84f1ce8b2a3b654b61591395d370ada9c906 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Fri, 13 Jun 2025 05:09:24 +0530
Subject: [PATCH 12/21] refactor: rename fbfloat16 smoke test suite, refactor
 bfloat16 specialization for MPFRNumber

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/test/src/math/smoke/fbfloat16_test.cpp |  4 ++--
 libc/utils/MPFRWrapper/MPCommon.h           | 23 +++++++++++----------
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index 06624fbfd33d0..c4f0892e4772e 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -12,9 +12,9 @@
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-using LlvmLibcFBfloat16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+using LlvmLibcFBfloat16SmokeTest = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
 
-TEST_F(LlvmLibcFBfloat16Test, SpecialNumbers) {
+TEST_F(LlvmLibcFBfloat16SmokeTest, SpecialNumbers) {
   constexpr float SPECIAL_FLOATS[] = {
     0.0f, 1.0f, 2.0f, 4.5f, -1.0f, -0.5f, 3.140625f
   };
diff --git a/libc/utils/MPFRWrapper/MPCommon.h b/libc/utils/MPFRWrapper/MPCommon.h
index 0cabb63439927..199363a5f2fba 100644
--- a/libc/utils/MPFRWrapper/MPCommon.h
+++ b/libc/utils/MPFRWrapper/MPCommon.h
@@ -139,17 +139,6 @@ class MPFRNumber {
     mpfr_set_d(value, x, mpfr_rounding);
   }
 
-  template <typename XType,
-            cpp::enable_if_t<cpp::is_same_v<bfloat16, XType>, int> = 0>
-  explicit MPFRNumber(XType x,
-                      unsigned int precision = 8,
-                      RoundingMode rounding = RoundingMode::Nearest)
-      : mpfr_precision(precision),
-        mpfr_rounding(get_mpfr_rounding_mode(rounding)) {
-    mpfr_init2(value, mpfr_precision);
-    mpfr_set_flt(value, x.as_float(), mpfr_rounding);
-  }
-
   template <typename XType,
             cpp::enable_if_t<cpp::is_same_v<long double, XType>, int> = 0>
   explicit MPFRNumber(XType x,
@@ -185,6 +174,18 @@ class MPFRNumber {
     mpfr_set_sj(value, x, mpfr_rounding);
   }
 
+  // BFloat16
+  template <typename XType,
+            cpp::enable_if_t<cpp::is_same_v<bfloat16, XType>, int> = 0>
+  explicit MPFRNumber(XType x, unsigned int precision = 8,
+                      RoundingMode rounding = RoundingMode::Nearest)
+      : mpfr_precision(precision),
+        mpfr_rounding(get_mpfr_rounding_mode(rounding)) {
+    mpfr_init2(value, mpfr_precision);
+    // BFloat16::as_float() requires no rounding
+    mpfr_set_flt(value, x.as_float(), mpfr_rounding);
+  }
+
   MPFRNumber(const MPFRNumber &other);
   MPFRNumber(const MPFRNumber &other, unsigned int precision);
   MPFRNumber(const mpfr_t x, unsigned int precision, RoundingMode rounding);

>From 4e7a38e7de5982400fec6b9de3b021d07fcb3831 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Fri, 13 Jun 2025 05:09:53 +0530
Subject: [PATCH 13/21] feat: add exhaustive tests for fbfloat16

---
 .../src/math/exhaustive/fbfloat16_test.cpp    | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 libc/test/src/math/exhaustive/fbfloat16_test.cpp

diff --git a/libc/test/src/math/exhaustive/fbfloat16_test.cpp b/libc/test/src/math/exhaustive/fbfloat16_test.cpp
new file mode 100644
index 0000000000000..bb5e6f9854a54
--- /dev/null
+++ b/libc/test/src/math/exhaustive/fbfloat16_test.cpp
@@ -0,0 +1,45 @@
+//===-- Exhaustive tests for fbfloat16 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/__support/FPUtil/bfloat16.h"
+
+#include "utils/MPFRWrapper/MPCommon.h"
+
+#include "src/math/fbfloat16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using LlvmLibcFBfloat16ExhaustiveTest =
+    LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+
+// range: [0, inf]
+static constexpr uint16_t POS_START = 0x0000U;
+static constexpr uint16_t POS_STOP = 0x7f80U;
+
+// range: [-0, -inf]
+static constexpr uint16_t NEG_START = 0x8000U;
+static constexpr uint16_t NEG_STOP = 0xff80;
+
+
+using MPFRNumber = LIBC_NAMESPACE::testing::mpfr::MPFRNumber;
+
+TEST_F(LlvmLibcFBfloat16ExhaustiveTest, PositiveRange) {
+  for (uint16_t bits = POS_START; bits <= POS_STOP; bits++) {
+    bfloat16 bf16_num{bits};
+    MPFRNumber mpfr_num{bf16_num};
+    ASSERT_FP_EQ(mpfr_num.as<float>(), bf16_num.as_float());
+  }
+}
+
+TEST_F(LlvmLibcFBfloat16ExhaustiveTest, NegativeRange) {
+  for (uint16_t bits = NEG_START; bits <= NEG_STOP; bits++) {
+    bfloat16 bf16_num{bits};
+    MPFRNumber mpfr_num{bf16_num};
+    ASSERT_FP_EQ(mpfr_num.as<float>(), bf16_num.as_float());
+  }
+}

>From ea6cdae5d7955c5eaf22f6f3219f6ed61bbdf2a6 Mon Sep 17 00:00:00 2001
From: krishna2803 <kpandey81930 at gmail.com>
Date: Fri, 13 Jun 2025 05:49:03 +0530
Subject: [PATCH 14/21] feat: implement fabsbf16 function

Signed-off-by: krishna2803 <kpandey81930 at gmail.com>
---
 libc/config/linux/x86_64/entrypoints.txt   |  1 +
 libc/src/math/CMakeLists.txt               |  2 ++
 libc/src/math/fabsbf16.h                   | 21 ++++++++++++++
 libc/src/math/generic/CMakeLists.txt       | 33 ++++++++++++++--------
 libc/src/math/generic/fabsbf16.cpp         | 19 +++++++++++++
 libc/test/src/math/smoke/CMakeLists.txt    | 12 ++++++++
 libc/test/src/math/smoke/fabsbf16_test.cpp | 13 +++++++++
 7 files changed, 90 insertions(+), 11 deletions(-)
 create mode 100644 libc/src/math/fabsbf16.h
 create mode 100644 libc/src/math/generic/fabsbf16.cpp
 create mode 100644 libc/test/src/math/smoke/fabsbf16_test.cpp

diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index df1922172c8ae..c4f727c985498 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -887,6 +887,7 @@ if(LIBC_TYPES_HAS_BFLOAT16)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # Bfloat16 Entrypoints
     libc.src.math.fbfloat16
+    libc.src.math.fabsbf16
   )
 endif()
 
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 57b72d6e712f6..9f9d50f16d841 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -558,3 +558,5 @@ add_math_entrypoint_object(ufromfpxf128)
 
 # BFloat16 functions
 add_math_entrypoint_object(fbfloat16)
+
+add_math_entrypoint_object(fabsbf16)
diff --git a/libc/src/math/fabsbf16.h b/libc/src/math/fabsbf16.h
new file mode 100644
index 0000000000000..02c6498d37a8e
--- /dev/null
+++ b/libc/src/math/fabsbf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for fabsbf16 ----------------------*- 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_FABSBF16_H
+#define LLVM_LIBC_SRC_MATH_FABSBF16_H
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 fabsbf16(bfloat16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_FABSBF16_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index 2802c82ad9607..444058e4dc154 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -5070,6 +5070,20 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.generic.mul
 )
 
+add_header_library(
+  expxf16
+  HDRS
+    expxf16.h
+  DEPENDS
+    libc.src.__support.CPP.array
+    libc.src.__support.FPUtil.cast
+    libc.src.__support.FPUtil.fp_bits
+    libc.src.__support.FPUtil.multiply_add
+    libc.src.__support.FPUtil.nearest_integer
+    libc.src.__support.FPUtil.polyeval
+    libc.src.__support.macros.attributes
+)
+
 # Bfloat16 Functions
 
 add_entrypoint_object(
@@ -5080,20 +5094,17 @@ add_entrypoint_object(
     ../fbfloat16.h
   DEPENDS
     libc.src.__support.macros.config
-    libc.src.__support.macros.properties.types
     libc.src.__support.FPUtil.bfloat16
 )
 
-add_header_library(
-  expxf16
+add_entrypoint_object(
+  fabsbf16
+  SRCS
+    fabsbf16.cpp
   HDRS
-    expxf16.h
+    ../fabsbf16.h
   DEPENDS
-    libc.src.__support.CPP.array
-    libc.src.__support.FPUtil.cast
-    libc.src.__support.FPUtil.fp_bits
-    libc.src.__support.FPUtil.multiply_add
-    libc.src.__support.FPUtil.nearest_integer
-    libc.src.__support.FPUtil.polyeval
-    libc.src.__support.macros.attributes
+    libc.src.__support.macros.config
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.FPUtil.basic_operations
 )
diff --git a/libc/src/math/generic/fabsbf16.cpp b/libc/src/math/generic/fabsbf16.cpp
new file mode 100644
index 0000000000000..976eeb25b9907
--- /dev/null
+++ b/libc/src/math/generic/fabsbf16.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of fabsbf16 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/fabsbf16.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/FPUtil/BasicOperations.h" // fputil::abs
+#include "src/__support/macros/config.h"          // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, fabsbf16, (bfloat16 x)) { return fputil::abs(x); }
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 4dce1cad2cf58..c9c1a5f34c324 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -5330,3 +5330,15 @@ add_fp_unittest(
   DEPENDS
     libc.src.math.fbfloat16
 )
+
+add_fp_unittest(
+  fabsbf16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    fabsbf16_test.cpp
+  HDRS
+    FAbsTest.h
+  DEPENDS
+    libc.src.math.fabsbf16
+)
diff --git a/libc/test/src/math/smoke/fabsbf16_test.cpp b/libc/test/src/math/smoke/fabsbf16_test.cpp
new file mode 100644
index 0000000000000..ee0679eb4b8bb
--- /dev/null
+++ b/libc/test/src/math/smoke/fabsbf16_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for fabsf16 ---------------------------------------------===//
+//
+// 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 "FAbsTest.h"
+
+#include "src/math/fabsbf16.h"
+
+LIST_FABS_TESTS(bfloat16, LIBC_NAMESPACE::fabsbf16)

>From e27d59d11c7f7e683fe6a3e72b04639f9edb9ded Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Sun, 13 Jul 2025 00:44:55 +0530
Subject: [PATCH 15/21] refactor: remove unused files and reorganize structure

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 .../cmake/modules/CheckCompilerFeatures.cmake |  3 --
 .../compiler_features/check_bfloat16.cpp      |  1 -
 libc/config/linux/x86_64/entrypoints.txt      | 10 ++---
 libc/src/math/CMakeLists.txt                  |  5 +--
 libc/src/math/generic/CMakeLists.txt          | 37 +++++----------
 libc/src/math/generic/fbfloat16.cpp           | 25 -----------
 .../src/math/exhaustive/fbfloat16_test.cpp    | 45 -------------------
 libc/test/src/math/smoke/CMakeLists.txt       | 38 ++++++----------
 libc/utils/MPFRWrapper/MPCommon.h             | 12 -----
 9 files changed, 31 insertions(+), 145 deletions(-)
 delete mode 100644 libc/cmake/modules/compiler_features/check_bfloat16.cpp
 delete mode 100644 libc/src/math/generic/fbfloat16.cpp
 delete mode 100644 libc/test/src/math/exhaustive/fbfloat16_test.cpp

diff --git a/libc/cmake/modules/CheckCompilerFeatures.cmake b/libc/cmake/modules/CheckCompilerFeatures.cmake
index 6db69bd5c4895..a5ea66a5935b7 100644
--- a/libc/cmake/modules/CheckCompilerFeatures.cmake
+++ b/libc/cmake/modules/CheckCompilerFeatures.cmake
@@ -15,7 +15,6 @@ set(
     "fixed_point"
     "cfloat16"
     "cfloat128"
-    "bfloat16"
 )
 
 # Making sure ALL_COMPILER_FEATURES is sorted.
@@ -117,8 +116,6 @@ foreach(feature IN LISTS ALL_COMPILER_FEATURES)
       set(LIBC_TYPES_HAS_CFLOAT16 TRUE)
     elseif(${feature} STREQUAL "cfloat128")
       set(LIBC_TYPES_HAS_CFLOAT128 TRUE)
-    elseif(${feature} STREQUAL "bfloat16")
-      set(LIBC_TYPES_HAS_BFLOAT16 TRUE)
     elseif(${feature} STREQUAL "builtin_ceil_floor_rint_trunc")
       set(LIBC_COMPILER_HAS_BUILTIN_CEIL_FLOOR_RINT_TRUNC TRUE)
     elseif(${feature} STREQUAL "builtin_fmax_fmin")
diff --git a/libc/cmake/modules/compiler_features/check_bfloat16.cpp b/libc/cmake/modules/compiler_features/check_bfloat16.cpp
deleted file mode 100644
index fac0b901ac594..0000000000000
--- a/libc/cmake/modules/compiler_features/check_bfloat16.cpp
+++ /dev/null
@@ -1 +0,0 @@
-// intentionally left empty for CheckCompilerFeatures to work.
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index c4f727c985498..439c64aa8e576 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -883,13 +883,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
-if(LIBC_TYPES_HAS_BFLOAT16)
-  list(APPEND TARGET_LIBM_ENTRYPOINTS
-    # Bfloat16 Entrypoints
-    libc.src.math.fbfloat16
+
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+# Bfloat16 Entrypoints
     libc.src.math.fabsbf16
-  )
-endif()
+)
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 9f9d50f16d841..5a58e6a921f53 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -189,6 +189,7 @@ add_math_entrypoint_object(fabsf)
 add_math_entrypoint_object(fabsl)
 add_math_entrypoint_object(fabsf16)
 add_math_entrypoint_object(fabsf128)
+add_math_entrypoint_object(fabsbf16)
 
 add_math_entrypoint_object(fadd)
 add_math_entrypoint_object(faddl)
@@ -556,7 +557,3 @@ add_math_entrypoint_object(ufromfpxl)
 add_math_entrypoint_object(ufromfpxf16)
 add_math_entrypoint_object(ufromfpxf128)
 
-# BFloat16 functions
-add_math_entrypoint_object(fbfloat16)
-
-add_math_entrypoint_object(fabsbf16)
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index 444058e4dc154..adb5d51e16c28 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -684,6 +684,18 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.basic_operations
 )
 
+add_entrypoint_object(
+  fabsbf16
+  SRCS
+  fabsbf16.cpp
+  HDRS
+  ../fabsbf16.h
+  DEPENDS
+  libc.src.__support.FPUtil.basic_operations
+  libc.src.__support.FPUtil.bfloat16
+  libc.src.__support.macros.config
+)
+
 add_entrypoint_object(
   fadd
   SRCS
@@ -5083,28 +5095,3 @@ add_header_library(
     libc.src.__support.FPUtil.polyeval
     libc.src.__support.macros.attributes
 )
-
-# Bfloat16 Functions
-
-add_entrypoint_object(
-  fbfloat16
-  SRCS
-    fbfloat16.cpp
-  HDRS
-    ../fbfloat16.h
-  DEPENDS
-    libc.src.__support.macros.config
-    libc.src.__support.FPUtil.bfloat16
-)
-
-add_entrypoint_object(
-  fabsbf16
-  SRCS
-    fabsbf16.cpp
-  HDRS
-    ../fabsbf16.h
-  DEPENDS
-    libc.src.__support.macros.config
-    libc.src.__support.FPUtil.bfloat16
-    libc.src.__support.FPUtil.basic_operations
-)
diff --git a/libc/src/math/generic/fbfloat16.cpp b/libc/src/math/generic/fbfloat16.cpp
deleted file mode 100644
index 1ef183668a51a..0000000000000
--- a/libc/src/math/generic/fbfloat16.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-//===-- Implementation of fbfloat16 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/fbfloat16.h"
-
-#include "src/__support/FPUtil/bfloat16.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
-#include "src/__support/macros/properties/types.h"
-
-namespace LIBC_NAMESPACE_DECL {
-
-LLVM_LIBC_FUNCTION(float, fbfloat16, (bfloat16 x)) {
-  if (x.bits == 0)
-    return 0.0f;
-  else
-    return 1.0f;
-}
-
-} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/src/math/exhaustive/fbfloat16_test.cpp b/libc/test/src/math/exhaustive/fbfloat16_test.cpp
deleted file mode 100644
index bb5e6f9854a54..0000000000000
--- a/libc/test/src/math/exhaustive/fbfloat16_test.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-//===-- Exhaustive tests for fbfloat16 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/__support/FPUtil/bfloat16.h"
-
-#include "utils/MPFRWrapper/MPCommon.h"
-
-#include "src/math/fbfloat16.h"
-#include "test/UnitTest/FPMatcher.h"
-#include "test/UnitTest/Test.h"
-
-using LlvmLibcFBfloat16ExhaustiveTest =
-    LIBC_NAMESPACE::testing::FPTest<bfloat16>;
-
-// range: [0, inf]
-static constexpr uint16_t POS_START = 0x0000U;
-static constexpr uint16_t POS_STOP = 0x7f80U;
-
-// range: [-0, -inf]
-static constexpr uint16_t NEG_START = 0x8000U;
-static constexpr uint16_t NEG_STOP = 0xff80;
-
-
-using MPFRNumber = LIBC_NAMESPACE::testing::mpfr::MPFRNumber;
-
-TEST_F(LlvmLibcFBfloat16ExhaustiveTest, PositiveRange) {
-  for (uint16_t bits = POS_START; bits <= POS_STOP; bits++) {
-    bfloat16 bf16_num{bits};
-    MPFRNumber mpfr_num{bf16_num};
-    ASSERT_FP_EQ(mpfr_num.as<float>(), bf16_num.as_float());
-  }
-}
-
-TEST_F(LlvmLibcFBfloat16ExhaustiveTest, NegativeRange) {
-  for (uint16_t bits = NEG_START; bits <= NEG_STOP; bits++) {
-    bfloat16 bf16_num{bits};
-    MPFRNumber mpfr_num{bf16_num};
-    ASSERT_FP_EQ(mpfr_num.as<float>(), bf16_num.as_float());
-  }
-}
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index c9c1a5f34c324..2e4483c66090b 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -209,6 +209,20 @@ add_fp_unittest(
     libc.src.__support.FPUtil.fp_bits
 )
 
+add_fp_unittest(
+  fabsbf16_test
+  SUITE
+  libc-math-smoke-tests
+  SRCS
+  fabsbf16_test.cpp
+  HDRS
+  FAbsTest.h
+  DEPENDS
+  libc.src.__support.FPUtil.bfloat16
+  libc.src.math.fabsbf16
+)
+
+
 add_fp_unittest(
   fadd_test
   SUITE
@@ -5318,27 +5332,3 @@ add_fp_unittest(
     libc.src.__support.macros.properties.os
     libc.src.__support.macros.properties.types
 )
-
-# Bfloat16 Smoke Tests
-
-add_fp_unittest(
-  fbfloat16_test
-  SUITE
-    libc-math-smoke-tests
-  SRCS
-    fbfloat16_test.cpp
-  DEPENDS
-    libc.src.math.fbfloat16
-)
-
-add_fp_unittest(
-  fabsbf16_test
-  SUITE
-    libc-math-smoke-tests
-  SRCS
-    fabsbf16_test.cpp
-  HDRS
-    FAbsTest.h
-  DEPENDS
-    libc.src.math.fabsbf16
-)
diff --git a/libc/utils/MPFRWrapper/MPCommon.h b/libc/utils/MPFRWrapper/MPCommon.h
index 199363a5f2fba..af03ff054e1a9 100644
--- a/libc/utils/MPFRWrapper/MPCommon.h
+++ b/libc/utils/MPFRWrapper/MPCommon.h
@@ -174,18 +174,6 @@ class MPFRNumber {
     mpfr_set_sj(value, x, mpfr_rounding);
   }
 
-  // BFloat16
-  template <typename XType,
-            cpp::enable_if_t<cpp::is_same_v<bfloat16, XType>, int> = 0>
-  explicit MPFRNumber(XType x, unsigned int precision = 8,
-                      RoundingMode rounding = RoundingMode::Nearest)
-      : mpfr_precision(precision),
-        mpfr_rounding(get_mpfr_rounding_mode(rounding)) {
-    mpfr_init2(value, mpfr_precision);
-    // BFloat16::as_float() requires no rounding
-    mpfr_set_flt(value, x.as_float(), mpfr_rounding);
-  }
-
   MPFRNumber(const MPFRNumber &other);
   MPFRNumber(const MPFRNumber &other, unsigned int precision);
   MPFRNumber(const mpfr_t x, unsigned int precision, RoundingMode rounding);

>From b44b27c6aa6571985b9fe870b81c745078bccb20 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Sun, 13 Jul 2025 01:00:07 +0530
Subject: [PATCH 16/21] refactor: use LIST_FABS_TEST api for fabsbf16

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 libc/src/math/CMakeLists.txt                |  1 -
 libc/src/math/generic/fabsbf16.cpp          |  4 ++--
 libc/test/src/math/generic/CMakeLists.txt   |  1 -
 libc/test/src/math/smoke/fbfloat16_test.cpp | 26 ++++-----------------
 4 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 5a58e6a921f53..4db4eb909d8f6 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -556,4 +556,3 @@ add_math_entrypoint_object(ufromfpxf)
 add_math_entrypoint_object(ufromfpxl)
 add_math_entrypoint_object(ufromfpxf16)
 add_math_entrypoint_object(ufromfpxf128)
-
diff --git a/libc/src/math/generic/fabsbf16.cpp b/libc/src/math/generic/fabsbf16.cpp
index 976eeb25b9907..ea39719e82d42 100644
--- a/libc/src/math/generic/fabsbf16.cpp
+++ b/libc/src/math/generic/fabsbf16.cpp
@@ -8,9 +8,9 @@
 
 #include "src/math/fabsbf16.h"
 
+#include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/bfloat16.h"
-#include "src/__support/FPUtil/BasicOperations.h" // fputil::abs
-#include "src/__support/macros/config.h"          // LIBC_NAMESPACE_DECL
+#include "src/__support/macros/config.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/test/src/math/generic/CMakeLists.txt b/libc/test/src/math/generic/CMakeLists.txt
index 1fe7801941d5a..a9d54d6424294 100644
--- a/libc/test/src/math/generic/CMakeLists.txt
+++ b/libc/test/src/math/generic/CMakeLists.txt
@@ -30,4 +30,3 @@ add_fp_unittest(
   DEPENDS
     libc.src.math.generic.ceill
 )
-
diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
index c4f0892e4772e..c72983ec56db3 100644
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ b/libc/test/src/math/smoke/fbfloat16_test.cpp
@@ -1,4 +1,4 @@
-//===-- Unittests for fbfloat16 function ----------------------------------===//
+//===-- Unittests for fabsbf16 function -----------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,25 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/__support/FPUtil/bfloat16.h"
-
-#include "src/math/fbfloat16.h"
-#include "test/UnitTest/FPMatcher.h"
-#include "test/UnitTest/Test.h"
-
-using LlvmLibcFBfloat16SmokeTest = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+#include "FAbsTest.h"
 
-TEST_F(LlvmLibcFBfloat16SmokeTest, SpecialNumbers) {
-  constexpr float SPECIAL_FLOATS[] = {
-    0.0f, 1.0f, 2.0f, 4.5f, -1.0f, -0.5f, 3.140625f
-  };
-
-  constexpr uint16_t SPECIAL_BFLOAT16_BITS[] = {
-    0, 0x3f80U, 0x4000U, 0x4090U, 0xbf80U, 0xbf00, 0x4049U
-  };
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/fabsbf16.h"
 
-  for (int i=0; i<7; i++) {
-    bfloat16 x{SPECIAL_FLOATS[i]};
-    ASSERT_EQ(SPECIAL_BFLOAT16_BITS[i], x.bits);
-  }
-}
+LIST_FABS_TESTS(bfloat16, LIBC_NAMESPACE::fabsbf16)

>From f3d8a3f9f2c2dfa25233b4e8a4f9ab196830ec33 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Sun, 13 Jul 2025 01:09:46 +0530
Subject: [PATCH 17/21] chore: remove redundant stuff and add indents

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 libc/src/math/fabsbf16.h                    |  2 +-
 libc/src/math/fbfloat16.h                   | 22 ---------------------
 libc/src/math/generic/CMakeLists.txt        | 10 +++++-----
 libc/test/src/math/smoke/CMakeLists.txt     |  9 ++++-----
 libc/test/src/math/smoke/fabsbf16_test.cpp  |  2 +-
 libc/test/src/math/smoke/fbfloat16_test.cpp | 14 -------------
 6 files changed, 11 insertions(+), 48 deletions(-)
 delete mode 100644 libc/src/math/fbfloat16.h
 delete mode 100644 libc/test/src/math/smoke/fbfloat16_test.cpp

diff --git a/libc/src/math/fabsbf16.h b/libc/src/math/fabsbf16.h
index 02c6498d37a8e..d1768b9bdc875 100644
--- a/libc/src/math/fabsbf16.h
+++ b/libc/src/math/fabsbf16.h
@@ -10,7 +10,7 @@
 #define LLVM_LIBC_SRC_MATH_FABSBF16_H
 
 #include "src/__support/FPUtil/bfloat16.h"
-#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+#include "src/__support/macros/config.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/math/fbfloat16.h b/libc/src/math/fbfloat16.h
deleted file mode 100644
index 5b1b04b24a563..0000000000000
--- a/libc/src/math/fbfloat16.h
+++ /dev/null
@@ -1,22 +0,0 @@
-//===-- Implementation header for fbfloat16 ---------------------*- 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_FBFLOAT16_H
-#define LLVM_LIBC_SRC_MATH_FBFLOAT16_H
-
-#include "src/__support/FPUtil/bfloat16.h"
-#include "src/__support/macros/config.h"
-#include "src/__support/macros/properties/types.h"
-
-namespace LIBC_NAMESPACE_DECL {
-
-float fbfloat16(bfloat16 x);
-
-} // namespace LIBC_NAMESPACE_DECL
-
-#endif // LLVM_LIBC_SRC_MATH_FBFLOAT16_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index adb5d51e16c28..d87d01618fe47 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -687,13 +687,13 @@ add_entrypoint_object(
 add_entrypoint_object(
   fabsbf16
   SRCS
-  fabsbf16.cpp
+    fabsbf16.cpp
   HDRS
-  ../fabsbf16.h
+    ../fabsbf16.h
   DEPENDS
-  libc.src.__support.FPUtil.basic_operations
-  libc.src.__support.FPUtil.bfloat16
-  libc.src.__support.macros.config
+    libc.src.__support.FPUtil.basic_operations
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.macros.config
 )
 
 add_entrypoint_object(
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 2e4483c66090b..78f8d17be72dd 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -214,15 +214,14 @@ add_fp_unittest(
   SUITE
   libc-math-smoke-tests
   SRCS
-  fabsbf16_test.cpp
+    fabsbf16_test.cpp
   HDRS
-  FAbsTest.h
+    FAbsTest.h
   DEPENDS
-  libc.src.__support.FPUtil.bfloat16
-  libc.src.math.fabsbf16
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.math.fabsbf16
 )
 
-
 add_fp_unittest(
   fadd_test
   SUITE
diff --git a/libc/test/src/math/smoke/fabsbf16_test.cpp b/libc/test/src/math/smoke/fabsbf16_test.cpp
index ee0679eb4b8bb..dc97ae3a6853e 100644
--- a/libc/test/src/math/smoke/fabsbf16_test.cpp
+++ b/libc/test/src/math/smoke/fabsbf16_test.cpp
@@ -1,4 +1,4 @@
-//===-- Unittests for fabsf16 ---------------------------------------------===//
+//===-- Unittests for fabsbf16 --------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
diff --git a/libc/test/src/math/smoke/fbfloat16_test.cpp b/libc/test/src/math/smoke/fbfloat16_test.cpp
deleted file mode 100644
index c72983ec56db3..0000000000000
--- a/libc/test/src/math/smoke/fbfloat16_test.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-//===-- Unittests for fabsbf16 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 "FAbsTest.h"
-
-#include "src/__support/FPUtil/bfloat16.h"
-#include "src/math/fabsbf16.h"
-
-LIST_FABS_TESTS(bfloat16, LIBC_NAMESPACE::fabsbf16)

>From df7471f3b9ed267c996f5ce8d88b82d61ee9aca0 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Tue, 22 Jul 2025 22:38:19 +0530
Subject: [PATCH 18/21] Update libc/config/linux/x86_64/entrypoints.txt

Co-authored-by: OverMighty <its.overmighty at gmail.com>
---
 libc/config/linux/x86_64/entrypoints.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 439c64aa8e576..b4db7a3690c8f 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -885,7 +885,7 @@ endif()
 
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
-# Bfloat16 Entrypoints
+  # bfloat16 entrypoints
     libc.src.math.fabsbf16
 )
 

>From 1dd72faf75c337ca0a2dd8723600a80ecfb23454 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Wed, 23 Jul 2025 00:52:03 +0530
Subject: [PATCH 19/21] refactor: change includes

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 libc/src/math/fabsbf16.h                   | 2 +-
 libc/test/src/math/smoke/fabsbf16_test.cpp | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/libc/src/math/fabsbf16.h b/libc/src/math/fabsbf16.h
index d1768b9bdc875..49936680eb28b 100644
--- a/libc/src/math/fabsbf16.h
+++ b/libc/src/math/fabsbf16.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_MATH_FABSBF16_H
 #define LLVM_LIBC_SRC_MATH_FABSBF16_H
 
-#include "src/__support/FPUtil/bfloat16.h"
 #include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/test/src/math/smoke/fabsbf16_test.cpp b/libc/test/src/math/smoke/fabsbf16_test.cpp
index dc97ae3a6853e..611050a7775ab 100644
--- a/libc/test/src/math/smoke/fabsbf16_test.cpp
+++ b/libc/test/src/math/smoke/fabsbf16_test.cpp
@@ -8,6 +8,7 @@
 
 #include "FAbsTest.h"
 
+#include "src/__support/FPUtil/bfloat16.h"
 #include "src/math/fabsbf16.h"
 
 LIST_FABS_TESTS(bfloat16, LIBC_NAMESPACE::fabsbf16)

>From 59975318dbcde401ec674e527378f731e5b4d566 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Wed, 23 Jul 2025 20:19:24 +0530
Subject: [PATCH 20/21] chore: add entrypoints for all platforms

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 libc/config/baremetal/aarch64/entrypoints.txt | 5 +++++
 libc/config/baremetal/arm/entrypoints.txt     | 5 +++++
 libc/config/baremetal/riscv/entrypoints.txt   | 5 +++++
 libc/config/darwin/aarch64/entrypoints.txt    | 5 +++++
 libc/config/darwin/x86_64/entrypoints.txt     | 5 +++++
 libc/config/gpu/amdgpu/entrypoints.txt        | 5 +++++
 libc/config/gpu/nvptx/entrypoints.txt         | 5 +++++
 libc/config/linux/aarch64/entrypoints.txt     | 5 +++++
 libc/config/linux/arm/entrypoints.txt         | 5 +++++
 libc/config/linux/riscv/entrypoints.txt       | 5 +++++
 libc/config/windows/entrypoints.txt           | 5 +++++
 11 files changed, 55 insertions(+)

diff --git a/libc/config/baremetal/aarch64/entrypoints.txt b/libc/config/baremetal/aarch64/entrypoints.txt
index a8e653fdd5159..692f736adb7d9 100644
--- a/libc/config/baremetal/aarch64/entrypoints.txt
+++ b/libc/config/baremetal/aarch64/entrypoints.txt
@@ -753,6 +753,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index acafef17fa5d1..9438d5a6d075d 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -753,6 +753,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 023826f12d723..08b54ad841b0b 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -753,6 +753,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/config/darwin/aarch64/entrypoints.txt b/libc/config/darwin/aarch64/entrypoints.txt
index 437eca79a76f6..e577d6bee6a19 100644
--- a/libc/config/darwin/aarch64/entrypoints.txt
+++ b/libc/config/darwin/aarch64/entrypoints.txt
@@ -584,6 +584,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/config/darwin/x86_64/entrypoints.txt b/libc/config/darwin/x86_64/entrypoints.txt
index c55b6aa275690..722a65fde0bb9 100644
--- a/libc/config/darwin/x86_64/entrypoints.txt
+++ b/libc/config/darwin/x86_64/entrypoints.txt
@@ -231,6 +231,11 @@ set(TARGET_LIBM_ENTRYPOINTS
     #libc.src.math.truncl
 )
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}
diff --git a/libc/config/gpu/amdgpu/entrypoints.txt b/libc/config/gpu/amdgpu/entrypoints.txt
index 463727b9bb324..d1384d0fabca5 100644
--- a/libc/config/gpu/amdgpu/entrypoints.txt
+++ b/libc/config/gpu/amdgpu/entrypoints.txt
@@ -612,6 +612,11 @@ if(LIBC_TYPES_HAS_FLOAT16)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}
diff --git a/libc/config/gpu/nvptx/entrypoints.txt b/libc/config/gpu/nvptx/entrypoints.txt
index 13b77172dcf5e..9266a783c1409 100644
--- a/libc/config/gpu/nvptx/entrypoints.txt
+++ b/libc/config/gpu/nvptx/entrypoints.txt
@@ -614,6 +614,11 @@ if(LIBC_TYPES_HAS_FLOAT16)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 9e042cd4a8acb..9d08df8916d85 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -838,6 +838,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LLVM_LIBC_FULL_BUILD)
   list(APPEND TARGET_LIBC_ENTRYPOINTS
     # assert.h entrypoints
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index fa62f4d290c3a..b1f18d73def43 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -454,6 +454,11 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.ufromfpxl
 )
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index db8f8a7cf0b74..8b76dc16584e0 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -857,6 +857,11 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 if(LIBC_COMPILER_HAS_FIXED_POINT)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # stdfix.h _Fract and _Accum entrypoints
diff --git a/libc/config/windows/entrypoints.txt b/libc/config/windows/entrypoints.txt
index 09021a08cf731..7d03911617c3c 100644
--- a/libc/config/windows/entrypoints.txt
+++ b/libc/config/windows/entrypoints.txt
@@ -300,6 +300,11 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.truncl
 )
 
+list(APPEND TARGET_LIBM_ENTRYPOINTS
+  # bfloat16 entrypoints
+    libc.src.math.fabsbf16
+)
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}

>From aa293e2b8be9ddfdc2f7467ff36a17ead6445f5f Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81930 at gmail.com>
Date: Wed, 23 Jul 2025 20:25:12 +0530
Subject: [PATCH 21/21] nit: indentation

Signed-off-by: Krishna Pandey <kpandey81930 at gmail.com>
---
 libc/config/baremetal/aarch64/entrypoints.txt | 2 +-
 libc/config/baremetal/arm/entrypoints.txt     | 2 +-
 libc/config/baremetal/riscv/entrypoints.txt   | 2 +-
 libc/config/darwin/aarch64/entrypoints.txt    | 2 +-
 libc/config/darwin/x86_64/entrypoints.txt     | 2 +-
 libc/config/gpu/amdgpu/entrypoints.txt        | 2 +-
 libc/config/gpu/nvptx/entrypoints.txt         | 2 +-
 libc/config/linux/aarch64/entrypoints.txt     | 2 +-
 libc/config/linux/arm/entrypoints.txt         | 2 +-
 libc/config/linux/riscv/entrypoints.txt       | 2 +-
 libc/config/linux/x86_64/entrypoints.txt      | 2 +-
 libc/config/windows/entrypoints.txt           | 2 +-
 12 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/libc/config/baremetal/aarch64/entrypoints.txt b/libc/config/baremetal/aarch64/entrypoints.txt
index 692f736adb7d9..d47555660a17f 100644
--- a/libc/config/baremetal/aarch64/entrypoints.txt
+++ b/libc/config/baremetal/aarch64/entrypoints.txt
@@ -755,7 +755,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index 9438d5a6d075d..408b6ada79f98 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -755,7 +755,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 08b54ad841b0b..2e2411dcd5cc2 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -755,7 +755,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/darwin/aarch64/entrypoints.txt b/libc/config/darwin/aarch64/entrypoints.txt
index e577d6bee6a19..bd9a9f89a5ada 100644
--- a/libc/config/darwin/aarch64/entrypoints.txt
+++ b/libc/config/darwin/aarch64/entrypoints.txt
@@ -586,7 +586,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/darwin/x86_64/entrypoints.txt b/libc/config/darwin/x86_64/entrypoints.txt
index 722a65fde0bb9..00cedaba810c7 100644
--- a/libc/config/darwin/x86_64/entrypoints.txt
+++ b/libc/config/darwin/x86_64/entrypoints.txt
@@ -233,7 +233,7 @@ set(TARGET_LIBM_ENTRYPOINTS
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS
diff --git a/libc/config/gpu/amdgpu/entrypoints.txt b/libc/config/gpu/amdgpu/entrypoints.txt
index d1384d0fabca5..e39819dd85b72 100644
--- a/libc/config/gpu/amdgpu/entrypoints.txt
+++ b/libc/config/gpu/amdgpu/entrypoints.txt
@@ -614,7 +614,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS
diff --git a/libc/config/gpu/nvptx/entrypoints.txt b/libc/config/gpu/nvptx/entrypoints.txt
index 9266a783c1409..26e3b1547c98a 100644
--- a/libc/config/gpu/nvptx/entrypoints.txt
+++ b/libc/config/gpu/nvptx/entrypoints.txt
@@ -616,7 +616,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 9d08df8916d85..2ca160214a4c9 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -840,7 +840,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LLVM_LIBC_FULL_BUILD)
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index b1f18d73def43..7dbda7edcebfc 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -456,7 +456,7 @@ set(TARGET_LIBM_ENTRYPOINTS
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 8b76dc16584e0..42b84de10c06a 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -859,7 +859,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index b4db7a3690c8f..4f6c82bc9d105 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -886,7 +886,7 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)
diff --git a/libc/config/windows/entrypoints.txt b/libc/config/windows/entrypoints.txt
index 7d03911617c3c..84ff4f166ce43 100644
--- a/libc/config/windows/entrypoints.txt
+++ b/libc/config/windows/entrypoints.txt
@@ -302,7 +302,7 @@ set(TARGET_LIBM_ENTRYPOINTS
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
-    libc.src.math.fabsbf16
+  libc.src.math.fabsbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS

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