[libc-commits] [libc] [llvm] [libc][math][c++23] Add log10p1bf16 math function (PR #235343)
Uppala Prajin via libc-commits
libc-commits at lists.llvm.org
Sat Oct 24 12:40:33 PDT 2026
https://github.com/prajin-uppala created https://github.com/llvm/llvm-project/pull/235343
This PR adds the `log10p1bf16` math function to LLVM libc for the `bfloat16` type. It computes `log10(1 + x)` and handles special cases like NaN, infinity, zero, and the domain boundary at `x = -1`.
The implementation uses a polynomial approximation for small inputs and range reduction with a lookup table for other inputs. Special cases are handled to maintain the expected floating-point behavior, including exception behavior.
Added unit tests for accuracy, special values, and exception handling, along with smoke tests. Updated the relevant libc entrypoint lists, CMake files, and Bazel build files to integrate the function into both build systems.
Validated the implementation using the available CMake and Bazel build and test targets.
Fixes #234533
>From e9c0fb70c5fcddb47661d2af36d2bf7fb9da6cc6 Mon Sep 17 00:00:00 2001
From: prajin-uppala <cs24btech11064 at iith.ac.in>
Date: Sat, 24 Oct 2026 20:11:55 +0530
Subject: [PATCH 1/2] feat: add log10p1bf16 implementation and tests
---
libc/config/baremetal/aarch64/entrypoints.txt | 1 +
libc/config/baremetal/arm/entrypoints.txt | 1 +
libc/config/baremetal/hexagon/entrypoints.txt | 1 +
libc/config/baremetal/riscv/entrypoints.txt | 1 +
libc/config/darwin/aarch64/entrypoints.txt | 1 +
libc/config/darwin/x86_64/entrypoints.txt | 1 +
libc/config/freebsd/x86_64/entrypoints.txt | 1 +
libc/config/gpu/amdgpu/entrypoints.txt | 1 +
libc/config/gpu/nvptx/entrypoints.txt | 1 +
libc/config/linux/aarch64/entrypoints.txt | 1 +
libc/config/linux/arm/entrypoints.txt | 1 +
libc/config/linux/riscv/entrypoints.txt | 1 +
libc/config/linux/x86_64/entrypoints.txt | 1 +
libc/config/windows/entrypoints.txt | 1 +
libc/docs/headers/math/index.rst | 2 +-
libc/shared/math.h | 1 +
libc/shared/math/log10p1bf16.h | 23 +++
libc/src/__support/math/CMakeLists.txt | 29 ++++
libc/src/__support/math/log10p1bf16.h | 139 ++++++++++++++++++
libc/src/math/CMakeLists.txt | 1 +
libc/src/math/generic/CMakeLists.txt | 11 ++
libc/src/math/generic/log10p1bf16.cpp | 18 +++
libc/src/math/log10p1bf16.h | 21 +++
libc/test/shared/CMakeLists.txt | 1 +
libc/test/shared/shared_math_test.cpp | 2 +
libc/test/src/math/CMakeLists.txt | 13 ++
libc/test/src/math/log10p1bf16_test.cpp | 41 ++++++
libc/test/src/math/smoke/CMakeLists.txt | 14 ++
libc/test/src/math/smoke/log10p1bf16_test.cpp | 85 +++++++++++
.../llvm-project-overlay/libc/BUILD.bazel | 26 ++++
.../libc/test/src/math/BUILD.bazel | 5 +
.../libc/test/src/math/smoke/BUILD.bazel | 5 +
32 files changed, 450 insertions(+), 1 deletion(-)
create mode 100644 libc/shared/math/log10p1bf16.h
create mode 100644 libc/src/__support/math/log10p1bf16.h
create mode 100644 libc/src/math/generic/log10p1bf16.cpp
create mode 100644 libc/src/math/log10p1bf16.h
create mode 100644 libc/test/src/math/log10p1bf16_test.cpp
create mode 100644 libc/test/src/math/smoke/log10p1bf16_test.cpp
diff --git a/libc/config/baremetal/aarch64/entrypoints.txt b/libc/config/baremetal/aarch64/entrypoints.txt
index 7ec212d8709692..816f150131c83b 100644
--- a/libc/config/baremetal/aarch64/entrypoints.txt
+++ b/libc/config/baremetal/aarch64/entrypoints.txt
@@ -856,6 +856,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index 779d9fc23b28e8..a14ba955a4f3d7 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -867,6 +867,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/baremetal/hexagon/entrypoints.txt b/libc/config/baremetal/hexagon/entrypoints.txt
index 61f869457b3282..3fd82f0cee4e54 100644
--- a/libc/config/baremetal/hexagon/entrypoints.txt
+++ b/libc/config/baremetal/hexagon/entrypoints.txt
@@ -856,6 +856,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index b847a2bb1f47f0..305a1a7d06009a 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -859,6 +859,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/darwin/aarch64/entrypoints.txt b/libc/config/darwin/aarch64/entrypoints.txt
index 5600b82ad3410b..622990903587d4 100644
--- a/libc/config/darwin/aarch64/entrypoints.txt
+++ b/libc/config/darwin/aarch64/entrypoints.txt
@@ -678,6 +678,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/darwin/x86_64/entrypoints.txt b/libc/config/darwin/x86_64/entrypoints.txt
index e3fc845d2ed3af..6b0f337f22828d 100644
--- a/libc/config/darwin/x86_64/entrypoints.txt
+++ b/libc/config/darwin/x86_64/entrypoints.txt
@@ -313,6 +313,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.cbrtbf16
libc.src.math.logbbf16
diff --git a/libc/config/freebsd/x86_64/entrypoints.txt b/libc/config/freebsd/x86_64/entrypoints.txt
index 8f6c178301c2f2..bfb88309896fa4 100644
--- a/libc/config/freebsd/x86_64/entrypoints.txt
+++ b/libc/config/freebsd/x86_64/entrypoints.txt
@@ -610,6 +610,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/gpu/amdgpu/entrypoints.txt b/libc/config/gpu/amdgpu/entrypoints.txt
index 2eaef608e9a7ac..770ebf0c2272ea 100644
--- a/libc/config/gpu/amdgpu/entrypoints.txt
+++ b/libc/config/gpu/amdgpu/entrypoints.txt
@@ -727,6 +727,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/gpu/nvptx/entrypoints.txt b/libc/config/gpu/nvptx/entrypoints.txt
index 79d0c733ec3c01..b438bc225f1ad4 100644
--- a/libc/config/gpu/nvptx/entrypoints.txt
+++ b/libc/config/gpu/nvptx/entrypoints.txt
@@ -743,6 +743,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index be4d80db3afb37..b9d52a65bf679f 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -1088,6 +1088,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index 21488b488283b1..523bb38fe002d6 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -689,6 +689,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 20e33295bfb206..8c78b36093cb5a 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -1166,6 +1166,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 7d7c3ad1e1768d..0bad07ed9ee70d 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -1188,6 +1188,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/config/windows/entrypoints.txt b/libc/config/windows/entrypoints.txt
index 1712b2ad26fda4..20629fb55b86fd 100644
--- a/libc/config/windows/entrypoints.txt
+++ b/libc/config/windows/entrypoints.txt
@@ -404,6 +404,7 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.llogbbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
+ libc.src.math.log10p1bf16
libc.src.math.log_bf16
libc.src.math.logbbf16
libc.src.math.lrintbf16
diff --git a/libc/docs/headers/math/index.rst b/libc/docs/headers/math/index.rst
index 575c7bd1d1a10a..2b08d82d9da8ef 100644
--- a/libc/docs/headers/math/index.rst
+++ b/libc/docs/headers/math/index.rst
@@ -321,7 +321,7 @@ Higher Math Functions
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| log10 | |check| | |check| | | |check| | | | 7.12.6.12 | F.10.3.12 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| log10p1 | | | | |check| | | | 7.12.6.13 | F.10.3.13 |
+| log10p1 | | | | |check| | | |check| | 7.12.6.13 | F.10.3.13 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| log1p | |check| | |check| | | | | | 7.12.6.14 | F.10.3.14 |
+-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
diff --git a/libc/shared/math.h b/libc/shared/math.h
index eb72bebcb53bfa..db7105164aa2b0 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -335,6 +335,7 @@
#include "math/log10.h"
#include "math/log10f.h"
#include "math/log10f16.h"
+#include "math/log10p1bf16.h"
#include "math/log10p1f16.h"
#include "math/log1p.h"
#include "math/log1pf.h"
diff --git a/libc/shared/math/log10p1bf16.h b/libc/shared/math/log10p1bf16.h
new file mode 100644
index 00000000000000..60c869fc1b991f
--- /dev/null
+++ b/libc/shared/math/log10p1bf16.h
@@ -0,0 +1,23 @@
+//===-- Shared log10p1bf16 function -----------------------------*- 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_SHARED_MATH_LOG10P1BF16_H
+#define LLVM_LIBC_SHARED_MATH_LOG10P1BF16_H
+
+#include "shared/libc_common.h"
+#include "src/__support/math/log10p1bf16.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::log10p1bf16;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_LOG10P1BF16_H
diff --git a/libc/src/__support/math/CMakeLists.txt b/libc/src/__support/math/CMakeLists.txt
index 58f0730cba5756..aa58680fd0b25e 100644
--- a/libc/src/__support/math/CMakeLists.txt
+++ b/libc/src/__support/math/CMakeLists.txt
@@ -3125,6 +3125,17 @@ add_header_library(
libc.src.__support.macros.properties.types
)
+add_header_library(
+ check.exp_exceptions
+ HDRS
+ check/exp_exceptions.h
+ DEPENDS
+ libc.hdr.fenv_macros
+ libc.src.__support.FPUtil.fp_bits
+ libc.src.__support.common
+ libc.src.__support.macros.config
+)
+
add_header_library(
expf_double_eval
HDRS
@@ -5505,6 +5516,24 @@ add_header_library(
libc.src.__support.uint128
)
+add_header_library(
+ log10p1bf16
+ HDRS
+ log10p1bf16.h
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.hdr.fenv_macros
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.cast
+ libc.src.__support.FPUtil.fenv_impl
+ libc.src.__support.FPUtil.fp_bits
+ libc.src.__support.FPUtil.multiply_add
+ libc.src.__support.FPUtil.polyeval
+ libc.src.__support.macros.attributes
+ libc.src.__support.macros.config
+ libc.src.__support.macros.optimization
+)
+
add_header_library(
log_bf16
HDRS
diff --git a/libc/src/__support/math/log10p1bf16.h b/libc/src/__support/math/log10p1bf16.h
new file mode 100644
index 00000000000000..98b79cd91ccf6d
--- /dev/null
+++ b/libc/src/__support/math/log10p1bf16.h
@@ -0,0 +1,139 @@
+//===-- Implementation header for log10p1bf16 -------------------*- 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___SUPPORT_MATH_LOG10P1BF16_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LOG10P1BF16_H
+
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace math {
+
+namespace log10p1bf16_internal {
+
+// Generated by Sollya with the following commands:
+// > display = hexadecimal;
+// > for i from 0 to 31 do print(round(log10(1 + i * 2^-5), SG, RN));
+LIBC_INLINE_VAR constexpr float LOG10F_F[32] = {
+ 0x0p+0f, 0x1.b5e908p-7f, 0x1.af5f92p-6f, 0x1.3ed11ap-5f,
+ 0x1.a30a9ep-5f, 0x1.02428cp-4f, 0x1.31b306p-4f, 0x1.5fe804p-4f,
+ 0x1.8cf184p-4f, 0x1.b8de4ep-4f, 0x1.e3bc1ap-4f, 0x1.06cbd6p-3f,
+ 0x1.1b3e72p-3f, 0x1.2f3b6ap-3f, 0x1.42c7e8p-3f, 0x1.55e8c6p-3f,
+ 0x1.68a288p-3f, 0x1.7af974p-3f, 0x1.8cf184p-3f, 0x1.9e8e7cp-3f,
+ 0x1.afd3e4p-3f, 0x1.c0c514p-3f, 0x1.d1653p-3f, 0x1.e1b734p-3f,
+ 0x1.f1bdeep-3f, 0x1.00be06p-2f, 0x1.087a08p-2f, 0x1.101432p-2f,
+ 0x1.178da6p-2f, 0x1.1ee778p-2f, 0x1.2622bp-2f, 0x1.2d404cp-2f,
+};
+
+// Generated by Sollya with the following commands:
+// > display = hexadecimal;
+// > for i from 0 to 31 do print(round(1 / (1 + i * 2^-5), SG, RN));
+LIBC_INLINE_VAR constexpr float ONE_OVER_F_F[32] = {
+ 0x1p+0f, 0x1.f07c2p-1f, 0x1.e1e1e2p-1f, 0x1.d41d42p-1f,
+ 0x1.c71c72p-1f, 0x1.bacf92p-1f, 0x1.af286cp-1f, 0x1.a41a42p-1f,
+ 0x1.99999ap-1f, 0x1.8f9c18p-1f, 0x1.861862p-1f, 0x1.7d05f4p-1f,
+ 0x1.745d18p-1f, 0x1.6c16c2p-1f, 0x1.642c86p-1f, 0x1.5c9882p-1f,
+ 0x1.555556p-1f, 0x1.4e5e0ap-1f, 0x1.47ae14p-1f, 0x1.414142p-1f,
+ 0x1.3b13b2p-1f, 0x1.3521dp-1f, 0x1.2f684cp-1f, 0x1.29e412p-1f,
+ 0x1.24924ap-1f, 0x1.1f7048p-1f, 0x1.1a7b96p-1f, 0x1.15b1e6p-1f,
+ 0x1.111112p-1f, 0x1.0c9714p-1f, 0x1.08421p-1f, 0x1.041042p-1f,
+};
+
+// Generated by Sollya with the following commands:
+// > display = hexadecimal;
+// > round(log10(2), SG, RN);
+LIBC_INLINE_VAR constexpr float LOG10F_2 = 0x1.344136p-2f;
+
+} // namespace log10p1bf16_internal
+
+LIBC_INLINE bfloat16 log10p1bf16(bfloat16 x) {
+ using namespace log10p1bf16_internal;
+ using FPBits = fputil::FPBits<bfloat16>;
+ FPBits x_bits(x);
+ uint16_t x_u = x_bits.uintval();
+ uint16_t x_abs = x_u & 0x7fffU;
+
+ // Handle special values and use the small-input polynomial for |x| <= 0.125.
+ if (LIBC_UNLIKELY(x_abs <= 0x3e00U || x_abs >= 0x7f80U)) {
+ // log10p1(NaN) = NaN
+ if (x_bits.is_nan()) {
+ if (x_bits.is_signaling_nan()) {
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
+ return x;
+ }
+
+ // log10p1(+/-0) = +/-0
+ if (x_abs == 0U)
+ return x;
+
+ // log10p1(+inf) = +inf
+ if (x_u == 0x7f80U)
+ return x;
+
+ // log10p1(-inf) = NaN
+ if (x_abs >= 0x7f80U) {
+ fputil::set_errno_if_required(EDOM);
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
+
+ float xf = static_cast<float>(x);
+ return fputil::cast<bfloat16>(
+ xf * fputil::polyeval(xf, 0x1.bcb7b2p-2f, -0x1.bcb4cp-3f,
+ 0x1.2875bcp-3f, -0x1.c2946ep-4f, 0x1.69da2p-4f));
+ }
+
+ if (LIBC_UNLIKELY(x_u == 0xbf80U)) {
+ fputil::raise_except_if_required(FE_DIVBYZERO);
+ return FPBits::inf(Sign::NEG).get_val();
+ }
+
+ if (LIBC_UNLIKELY(x_u > 0xbf80U)) {
+ fputil::set_errno_if_required(EDOM);
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
+
+ if (LIBC_UNLIKELY(x_u == 0x4110U))
+ return FPBits(static_cast<uint16_t>(0x3f80U)).get_val();
+ if (LIBC_UNLIKELY(x_u == 0x42c6U))
+ return FPBits(static_cast<uint16_t>(0x4000U)).get_val();
+
+ float y = 1.0f + static_cast<float>(x);
+ using FPBitsFloat = fputil::FPBits<float>;
+ FPBitsFloat y_bits(y);
+
+ int e = y_bits.get_exponent();
+ y_bits.set_biased_exponent(FPBitsFloat::EXP_BIAS);
+ float mant_f = y_bits.get_val();
+
+ int f = y_bits.get_mantissa() >> (FPBitsFloat::FRACTION_LEN - 5);
+ float v = fputil::multiply_add(mant_f, ONE_OVER_F_F[f], -1.0f);
+ float log10p1_d_over_f =
+ v * fputil::polyeval(v, 0x1.bcb7bp-2f, -0x1.bce168p-3f, 0x1.28acb8p-3f);
+ float log10_1_mant = LOG10F_F[f] + log10p1_d_over_f;
+ return fputil::cast<bfloat16>(
+ fputil::multiply_add(static_cast<float>(e), LOG10F_2, log10_1_mant));
+}
+
+} // namespace math
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LOG10P1BF16_H
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 4f1dd95a6993da..3a1ab15e19a84b 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -403,6 +403,7 @@ add_math_entrypoint_object(log10)
add_math_entrypoint_object(log10f)
add_math_entrypoint_object(log10f16)
add_math_entrypoint_object(log10p1f16)
+add_math_entrypoint_object(log10p1bf16)
add_math_entrypoint_object(log1p)
add_math_entrypoint_object(log1pf)
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index 13cb65ff37e0b5..ae5e52d4ab38d9 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1788,6 +1788,17 @@ add_entrypoint_object(
libc.src.errno.errno
)
+add_entrypoint_object(
+ log10p1bf16
+ SRCS
+ log10p1bf16.cpp
+ HDRS
+ ../log10p1bf16.h
+ DEPENDS
+ libc.src.__support.math.log10p1bf16
+ libc.src.errno.errno
+)
+
add_entrypoint_object(
log10p1f16
SRCS
diff --git a/libc/src/math/generic/log10p1bf16.cpp b/libc/src/math/generic/log10p1bf16.cpp
new file mode 100644
index 00000000000000..64a327b9347ead
--- /dev/null
+++ b/libc/src/math/generic/log10p1bf16.cpp
@@ -0,0 +1,18 @@
+//===-- BFloat16 log10(1 + x) 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/log10p1bf16.h"
+#include "src/__support/math/log10p1bf16.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, log10p1bf16, (bfloat16 x)) {
+ return math::log10p1bf16(x);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/log10p1bf16.h b/libc/src/math/log10p1bf16.h
new file mode 100644
index 00000000000000..cc4e952df08d91
--- /dev/null
+++ b/libc/src/math/log10p1bf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for log10p1bf16 -------------------*- 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_LOG10P1BF16_H
+#define LLVM_LIBC_SRC_MATH_LOG10P1BF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 log10p1bf16(bfloat16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_LOG10P1BF16_H
diff --git a/libc/test/shared/CMakeLists.txt b/libc/test/shared/CMakeLists.txt
index 8c5d623d60ce30..2ce39954f7c480 100644
--- a/libc/test/shared/CMakeLists.txt
+++ b/libc/test/shared/CMakeLists.txt
@@ -331,6 +331,7 @@ else()
libc.src.__support.math.log
libc.src.__support.math.log10
libc.src.__support.math.log10f16
+ libc.src.__support.math.log10p1bf16
libc.src.__support.math.log10p1f16
libc.src.__support.math.log10f
libc.src.__support.math.log1p
diff --git a/libc/test/shared/shared_math_test.cpp b/libc/test/shared/shared_math_test.cpp
index d0581b5dababa9..6d78882dc48d7b 100644
--- a/libc/test/shared/shared_math_test.cpp
+++ b/libc/test/shared/shared_math_test.cpp
@@ -814,6 +814,8 @@ TEST(LlvmLibcSharedMathTest, AllBFloat16) {
EXPECT_FP_EQ(bfloat16(1.0), LIBC_NAMESPACE::shared::exp2bf16(bfloat16(0.0)));
EXPECT_FP_EQ(bfloat16(1.0), LIBC_NAMESPACE::shared::expbf16(bfloat16(0.0)));
EXPECT_FP_EQ(bfloat16(0.0), LIBC_NAMESPACE::shared::log_bf16(bfloat16(1.0)));
+ EXPECT_FP_EQ(bfloat16(1.0),
+ LIBC_NAMESPACE::shared::log10p1bf16(bfloat16(9.0)));
bfloat16 neg_min_denormal = FPBits::min_subnormal(Sign::NEG).get_val();
EXPECT_FP_EQ(neg_min_denormal,
diff --git a/libc/test/src/math/CMakeLists.txt b/libc/test/src/math/CMakeLists.txt
index ef326e3754e9d3..2ca817ad8ba9f1 100644
--- a/libc/test/src/math/CMakeLists.txt
+++ b/libc/test/src/math/CMakeLists.txt
@@ -2389,6 +2389,19 @@ add_fp_unittest(
libc.src.math.logf16
)
+add_fp_unittest(
+ log10p1bf16_test
+ NEED_MPFR
+ SUITE
+ libc-math-unittests
+ SRCS
+ log10p1bf16_test.cpp
+ DEPENDS
+ libc.src.math.log10p1bf16
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.fp_bits
+)
+
add_fp_unittest(
log_bf16_test
NEED_MPFR
diff --git a/libc/test/src/math/log10p1bf16_test.cpp b/libc/test/src/math/log10p1bf16_test.cpp
new file mode 100644
index 00000000000000..4208e2348103c8
--- /dev/null
+++ b/libc/test/src/math/log10p1bf16_test.cpp
@@ -0,0 +1,41 @@
+//===-- Full range tests for BFloat16 log10(1 + x) 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 "src/math/log10p1bf16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+using LlvmLibcLog10p1bf16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+// 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 = 0xff80U;
+
+TEST_F(LlvmLibcLog10p1bf16Test, PositiveRange) {
+ for (uint16_t v = POS_START; v <= POS_STOP; ++v) {
+ bfloat16 x = FPBits(v).get_val();
+ EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10p1, x,
+ LIBC_NAMESPACE::log10p1bf16(x), 0.5);
+ }
+}
+
+TEST_F(LlvmLibcLog10p1bf16Test, NegativeRange) {
+ for (uint16_t v = NEG_START; v <= NEG_STOP; ++v) {
+ bfloat16 x = FPBits(v).get_val();
+ EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10p1, x,
+ LIBC_NAMESPACE::log10p1bf16(x), 0.5);
+ }
+}
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 1a3509baccfa19..6b16def74b1be4 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -4496,6 +4496,20 @@ add_fp_unittest(
libc.src.__support.FPUtil.cast
)
+add_fp_unittest(
+ log10p1bf16_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ log10p1bf16_test.cpp
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.hdr.fenv_macros
+ libc.src.math.log10p1bf16
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.fp_bits
+)
+
add_fp_unittest(
log_bf16_test
SUITE
diff --git a/libc/test/src/math/smoke/log10p1bf16_test.cpp b/libc/test/src/math/smoke/log10p1bf16_test.cpp
new file mode 100644
index 00000000000000..8d635f39f9dfa4
--- /dev/null
+++ b/libc/test/src/math/smoke/log10p1bf16_test.cpp
@@ -0,0 +1,85 @@
+//===-- Unittests for BFloat16 log10(1 + x) 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 "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/macros/properties/types.h"
+#include "src/math/log10p1bf16.h"
+#include "test/UnitTest/FEnvSafeTest.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using FPBits = LIBC_NAMESPACE::fputil::FPBits<bfloat16>;
+
+class LlvmLibcLog10p1bf16Test : public LIBC_NAMESPACE::testing::FEnvSafeTest {
+ DECLARE_SPECIAL_CONSTANTS(bfloat16)
+
+public:
+ void test_special_numbers() {
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(aNaN), 0);
+ EXPECT_MATH_ERRNO(0);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(sNaN), FE_INVALID);
+ EXPECT_MATH_ERRNO(0);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ inf, LIBC_NAMESPACE::log10p1bf16(inf), 0);
+ EXPECT_MATH_ERRNO(0);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(neg_inf), FE_INVALID);
+ EXPECT_MATH_ERRNO(EDOM);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ zero, LIBC_NAMESPACE::log10p1bf16(zero), 0);
+ EXPECT_MATH_ERRNO(0);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ neg_zero, LIBC_NAMESPACE::log10p1bf16(neg_zero), 0);
+ EXPECT_MATH_ERRNO(0);
+
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ neg_inf, LIBC_NAMESPACE::log10p1bf16(bfloat16(-1.0)), FE_DIVBYZERO);
+ EXPECT_MATH_ERRNO(0);
+
+ const bfloat16 neg_two = FPBits(static_cast<uint16_t>(0xc000U)).get_val();
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(neg_two), FE_INVALID);
+ EXPECT_MATH_ERRNO(EDOM);
+
+ bfloat16 neg_one_adjacent =
+ FPBits(static_cast<uint16_t>(0xbf81U)).get_val();
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(neg_one_adjacent), FE_INVALID);
+ EXPECT_MATH_ERRNO(EDOM);
+
+ bfloat16 neg_inf_adjacent =
+ FPBits(static_cast<uint16_t>(0xff7fU)).get_val();
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ aNaN, LIBC_NAMESPACE::log10p1bf16(neg_inf_adjacent), FE_INVALID);
+ EXPECT_MATH_ERRNO(EDOM);
+
+ const bfloat16 one = bfloat16(1.0);
+ const bfloat16 nine = bfloat16(9.0);
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ one, LIBC_NAMESPACE::log10p1bf16(nine), 0);
+ EXPECT_MATH_ERRNO(0);
+
+ const bfloat16 two = bfloat16(2.0);
+ const bfloat16 ninety_nine = bfloat16(99.0);
+ EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(
+ two, LIBC_NAMESPACE::log10p1bf16(ninety_nine), 0);
+ EXPECT_MATH_ERRNO(0);
+ }
+};
+
+TEST_F(LlvmLibcLog10p1bf16Test, SpecialNumbers) { test_special_numbers(); }
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index b6fea42da5e3a1..aa7d0624daf6c3 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -10370,6 +10370,25 @@ libc_support_library(
],
)
+libc_support_library(
+ name = "__support_math_log10p1bf16",
+ hdrs = ["src/__support/math/log10p1bf16.h"],
+ deps = [
+ ":__support_common",
+ ":__support_fputil_bfloat16",
+ ":__support_fputil_cast",
+ ":__support_fputil_fenv_impl",
+ ":__support_fputil_fp_bits",
+ ":__support_fputil_multiply_add",
+ ":__support_fputil_polyeval",
+ ":__support_macros_attributes",
+ ":__support_macros_config",
+ ":__support_macros_optimization",
+ ":hdr_errno_macros",
+ ":hdr_fenv_macros",
+ ],
+)
+
libc_support_library(
name = "__support_math_log10p1f16",
hdrs = ["src/__support/math/log10p1f16.h"],
@@ -14444,6 +14463,13 @@ libc_math_function(
],
)
+libc_math_function(
+ name = "log10p1bf16",
+ additional_deps = [
+ ":__support_math_log10p1bf16",
+ ],
+)
+
libc_math_function(
name = "log10p1f16",
additional_deps = [
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/math/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/math/BUILD.bazel
index cdb8d203c06e11..df52a3ba2ca041 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/math/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/math/BUILD.bazel
@@ -1109,6 +1109,11 @@ math_mpfr_test(name = "log2p1f16")
math_mpfr_test(name = "log10f16")
+math_mpfr_test(
+ name = "log10p1bf16",
+ deps = ["//libc:__support_fputil_bfloat16"],
+)
+
math_mpfr_test(name = "log10p1f16")
math_mpfr_test(name = "lgammaf16")
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/math/smoke/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/math/smoke/BUILD.bazel
index 40e8163f8a86e9..b451a6d8a6aa99 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/math/smoke/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/math/smoke/BUILD.bazel
@@ -2384,6 +2384,11 @@ math_test(name = "log2f16")
math_test(name = "log2p1f16")
+math_test(
+ name = "log10p1bf16",
+ deps = ["//libc:__support_fputil_bfloat16"],
+)
+
math_test(name = "log10p1f16")
math_test(name = "logf16")
>From 626c2d842431718070e2e1d085ed03a782305dc5 Mon Sep 17 00:00:00 2001
From: prajin-uppala <cs24btech11064 at iith.ac.in>
Date: Sun, 25 Oct 2026 00:05:08 +0530
Subject: [PATCH 2/2] chore: update log10p1bf16 comments and build files
---
libc/src/__support/math/log10p1bf16.h | 22 ++++++++++++++++---
libc/src/math/CMakeLists.txt | 2 +-
.../llvm-project-overlay/libc/BUILD.bazel | 1 -
3 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/libc/src/__support/math/log10p1bf16.h b/libc/src/__support/math/log10p1bf16.h
index 98b79cd91ccf6d..b1de5fd6e10d3a 100644
--- a/libc/src/__support/math/log10p1bf16.h
+++ b/libc/src/__support/math/log10p1bf16.h
@@ -26,9 +26,12 @@ namespace math {
namespace log10p1bf16_internal {
+// The top five mantissa bits select F = 1 + f * 2^-5, where f is in [0, 31].
+// BFloat16 has seven explicit mantissa bits, so the table uses five of those
+// bits for lookup and the remaining two bits to refine the residual.
// Generated by Sollya with the following commands:
// > display = hexadecimal;
-// > for i from 0 to 31 do print(round(log10(1 + i * 2^-5), SG, RN));
+// > for f from 0 to 31 do print(round(log10(1 + f * 2^-5), SG, RN));
LIBC_INLINE_VAR constexpr float LOG10F_F[32] = {
0x0p+0f, 0x1.b5e908p-7f, 0x1.af5f92p-6f, 0x1.3ed11ap-5f,
0x1.a30a9ep-5f, 0x1.02428cp-4f, 0x1.31b306p-4f, 0x1.5fe804p-4f,
@@ -40,9 +43,11 @@ LIBC_INLINE_VAR constexpr float LOG10F_F[32] = {
0x1.178da6p-2f, 0x1.1ee778p-2f, 0x1.2622bp-2f, 0x1.2d404cp-2f,
};
+// ONE_OVER_F_F[f] stores the reciprocal of the same representative F. It is
+// used to form the residual v = M * (1 / F) - 1.
// Generated by Sollya with the following commands:
// > display = hexadecimal;
-// > for i from 0 to 31 do print(round(1 / (1 + i * 2^-5), SG, RN));
+// > for f from 0 to 31 do print(round(1 / (1 + f * 2^-5), SG, RN));
LIBC_INLINE_VAR constexpr float ONE_OVER_F_F[32] = {
0x1p+0f, 0x1.f07c2p-1f, 0x1.e1e1e2p-1f, 0x1.d41d42p-1f,
0x1.c71c72p-1f, 0x1.bacf92p-1f, 0x1.af286cp-1f, 0x1.a41a42p-1f,
@@ -68,7 +73,8 @@ LIBC_INLINE bfloat16 log10p1bf16(bfloat16 x) {
uint16_t x_u = x_bits.uintval();
uint16_t x_abs = x_u & 0x7fffU;
- // Handle special values and use the small-input polynomial for |x| <= 0.125.
+ // Handle special values; for |x| <= 0.125 (bits <= 0x3e00), use a direct
+ // polynomial to avoid cancellation in the range-reduction residual.
if (LIBC_UNLIKELY(x_abs <= 0x3e00U || x_abs >= 0x7f80U)) {
// log10p1(NaN) = NaN
if (x_bits.is_nan()) {
@@ -94,12 +100,15 @@ LIBC_INLINE bfloat16 log10p1bf16(bfloat16 x) {
return FPBits::quiet_nan().get_val();
}
+ // This degree-4 polynomial is shared with log10p1f16 and approximates
+ // log10(1 + x) / x; multiplying by x gives log10(1 + x).
float xf = static_cast<float>(x);
return fputil::cast<bfloat16>(
xf * fputil::polyeval(xf, 0x1.bcb7b2p-2f, -0x1.bcb4cp-3f,
0x1.2875bcp-3f, -0x1.c2946ep-4f, 0x1.69da2p-4f));
}
+ // x = -1 has bits 0xbf80 and is the domain boundary log10(1 + x) = -inf.
if (LIBC_UNLIKELY(x_u == 0xbf80U)) {
fputil::raise_except_if_required(FE_DIVBYZERO);
return FPBits::inf(Sign::NEG).get_val();
@@ -111,11 +120,18 @@ LIBC_INLINE bfloat16 log10p1bf16(bfloat16 x) {
return FPBits::quiet_nan().get_val();
}
+ // log10(1 + 9) = 1 and log10(1 + 99) = 2 exactly; return them directly.
if (LIBC_UNLIKELY(x_u == 0x4110U))
return FPBits(static_cast<uint16_t>(0x3f80U)).get_val();
if (LIBC_UNLIKELY(x_u == 0x42c6U))
return FPBits(static_cast<uint16_t>(0x4000U)).get_val();
+ // For y = 1 + x, write y = 2^e * M, where M is in [1, 2), and select
+ // F = 1 + f * 2^-5 from the lookup tables. Then:
+ // log10(y) = e * log10(2) + log10(F) + log10(M / F).
+ // The residual v = M / F - 1 is computed using the reciprocal table. This
+ // degree-2 polynomial is shared with log10p1f16 and approximates
+ // log10(1 + v) / v, giving the correction log10(M / F).
float y = 1.0f + static_cast<float>(x);
using FPBitsFloat = fputil::FPBits<float>;
FPBitsFloat y_bits(y);
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 3a1ab15e19a84b..46e98ba38e4cdc 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -402,8 +402,8 @@ add_math_entrypoint_object(ldexpbf16)
add_math_entrypoint_object(log10)
add_math_entrypoint_object(log10f)
add_math_entrypoint_object(log10f16)
-add_math_entrypoint_object(log10p1f16)
add_math_entrypoint_object(log10p1bf16)
+add_math_entrypoint_object(log10p1f16)
add_math_entrypoint_object(log1p)
add_math_entrypoint_object(log1pf)
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index aa7d0624daf6c3..70c9303e4e16b3 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -10374,7 +10374,6 @@ libc_support_library(
name = "__support_math_log10p1bf16",
hdrs = ["src/__support/math/log10p1bf16.h"],
deps = [
- ":__support_common",
":__support_fputil_bfloat16",
":__support_fputil_cast",
":__support_fputil_fenv_impl",
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