diff --git a/libc/shared/math.h b/libc/shared/math.h
index 66132326c2257..288a471b5d3a1 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -85,6 +85,7 @@
 #include "math/llogbf.h"
 #include "math/llogbf128.h"
 #include "math/llogbf16.h"
+#include "math/llogbl.h"
 #include "math/log.h"
 #include "math/log10.h"
 #include "math/log1p.h"
diff --git a/libc/shared/math/llogbl.h b/libc/shared/math/llogbl.h
new file mode 100644
index 0000000000000..3135787e08d2f
--- /dev/null
+++ b/libc/shared/math/llogbl.h
@@ -0,0 +1,23 @@
+//===-- Shared llogbl 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_LLOGBL_H
+#define LLVM_LIBC_SHARED_MATH_LLOGBL_H
+
+#include "shared/libc_common.h"
+#include "src/__support/math/llogbl.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::llogbl;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_LLOGBL_H
diff --git a/libc/src/__support/math/CMakeLists.txt b/libc/src/__support/math/CMakeLists.txt
index c0293c0969217..79edba3e25227 100644
--- a/libc/src/__support/math/CMakeLists.txt
+++ b/libc/src/__support/math/CMakeLists.txt
@@ -816,6 +816,16 @@ add_header_library(
     libc.src.__support.macros.config
 )
 
+add_header_library(
+  llogbl
+  HDRS
+    llogbl.h
+  DEPENDS
+    libc.src.__support.FPUtil.manipulation_functions
+    libc.src.__support.common
+    libc.src.__support.macros.config
+)
+
 add_header_library(
   logf16
   HDRS
diff --git a/libc/src/__support/math/llogbl.h b/libc/src/__support/math/llogbl.h
new file mode 100644
index 0000000000000..58c9770613cd5
--- /dev/null
+++ b/libc/src/__support/math/llogbl.h
@@ -0,0 +1,28 @@
+//===-- Implementation header for llogbl ------------------------*- 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_LLOGBL_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LLOGBL_H
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+LIBC_INLINE constexpr long llogbl(long double x) {
+  return fputil::intlogb<long>(x);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LLOGBL_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index 96dc0e7ca4851..c491bbbab85b4 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1798,7 +1798,7 @@ add_entrypoint_object(
   HDRS
     ../llogbl.h
   DEPENDS
-    libc.src.__support.FPUtil.manipulation_functions
+    libc.src.__support.math.llogbl
 )
 
 add_entrypoint_object(
diff --git a/libc/src/math/generic/llogbl.cpp b/libc/src/math/generic/llogbl.cpp
index 7ee3ac55653b6..5c5e15ae19455 100644
--- a/libc/src/math/generic/llogbl.cpp
+++ b/libc/src/math/generic/llogbl.cpp
@@ -7,14 +7,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/math/llogbl.h"
-#include "src/__support/FPUtil/ManipulationFunctions.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
+#include "src/__support/math/llogbl.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
-LLVM_LIBC_FUNCTION(long, llogbl, (long double x)) {
-  return fputil::intlogb<long>(x);
-}
+LLVM_LIBC_FUNCTION(long, llogbl, (long double x)) { return math::llogbl(x); }
 
 } // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/shared/CMakeLists.txt b/libc/test/shared/CMakeLists.txt
index 7d72ced3e057c..edb98e3b83c03 100644
--- a/libc/test/shared/CMakeLists.txt
+++ b/libc/test/shared/CMakeLists.txt
@@ -91,6 +91,7 @@ add_fp_unittest(
     libc.src.__support.math.llogbf128
     libc.src.__support.math.llogbf16
     libc.src.__support.math.logf16    
+    libc.src.__support.math.llogbl
     libc.src.__support.math.rsqrtf
     libc.src.__support.math.rsqrtf16
     libc.src.__support.math.sqrtf16
diff --git a/libc/test/shared/shared_math_test.cpp b/libc/test/shared/shared_math_test.cpp
index 9e024387efbfa..97e1d0d4426cd 100644
--- a/libc/test/shared/shared_math_test.cpp
+++ b/libc/test/shared/shared_math_test.cpp
@@ -149,6 +149,7 @@ TEST(LlvmLibcSharedMathTest, AllLongDouble) {
                LIBC_NAMESPACE::shared::dfmal(0x0.p+0L, 0x0.p+0L, 0x0.p+0L));
   EXPECT_FP_EQ(0x0p+0f, LIBC_NAMESPACE::shared::fsqrtl(0.0L));
   EXPECT_EQ(0, LIBC_NAMESPACE::shared::ilogbl(0x1.p+0L));
+  EXPECT_EQ(0L, LIBC_NAMESPACE::shared::llogbl(1.0L));
   EXPECT_FP_EQ(10.0f, LIBC_NAMESPACE::shared::ffmal(2.0L, 3.0, 4.0L));
 }
 
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index ae7228c52d3c0..3d4f66fb10c7a 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -3105,11 +3105,23 @@ libc_support_library(
     ],
 )
 
+libc_support_library(
+    name = "__support_math_llogbl",
+    hdrs = ["src/__support/math/llogbl.h"],
+    deps = [
+        ":__support_common",
+        ":__support_fputil_manipulation_functions",
+        ":__support_macros_config",
+    ],
+)
+
 libc_support_library(
     name = "__support_math_llogbf",
     hdrs = ["src/__support/math/llogbf.h"],
     deps = [
+        ":__support_common",
         ":__support_fputil_manipulation_functions",
+        ":__support_macros_config",
     ],
 )
 
@@ -4960,7 +4972,12 @@ libc_math_function(
     additional_deps = [":__support_math_llogbf"],
 )
 
-libc_math_function(name = "llogbl")
+libc_math_function(
+    name = "llogbl",
+    additional_deps = [
+        ":__support_math_llogbl",
+    ],
+)
 
 libc_math_function(
     name = "llogbf128",